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md5��法

我心(j��)飞翔 — Wed, 11 Oct 2006 09:25:00 GMT

				
						package
				 com.chinajavaworld.util;
 
import java.lang.reflect.*;
import java.io.*;
/*************************************************
md5 �c�d����C��(ji��n)RSA Data Security, Inc.在提交给IETF
的RFC1321中的MD5 message-digest ���法�?br />*************************************************/
 
publicclass MD5 {
/* 下面�q�些S11-S44实际上是一�?*4的矩阵，在原始的C实现中是�?define 实现的，
        �q�里把它们实现成为static final是表�C�Z��(ji��n)只读�Q�切能在同一个进�E�空间内的多�?br />        Instance间共�?/
staticfinalint S11 = 7;
staticfinalint S12 = 12;
staticfinalint S13 = 17;
staticfinalint S14 = 22;
 
staticfinalint S21 = 5;
staticfinalint S22 = 9;
staticfinalint S23 = 14;
staticfinalint S24 = 20;
 
staticfinalint S31 = 4;
staticfinalint S32 = 11;
staticfinalint S33 = 16;
staticfinalint S34 = 23;
 
staticfinalint S41 = 6;
staticfinalint S42 = 10;
staticfinalint S43 = 15;
staticfinalint S44 = 21;
 
staticfinalbyte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
/* 下面的三个成员是MD5计算�q�程中用到的3个核�?j��)数据，在原始的C实现�?br />           被定义到MD5_CTX�l�构�?br />
         */
privatelong[] state = newlong[4];  // state (ABCD)
privatelong[] count = newlong[2];  // number of bits, modulo 2^64 (lsb first)
privatebyte[] buffer = newbyte[64]; // input buffer
 
/* digestHexStr是MD5的唯一一个公共成员，是最��C���ơ计���结果的
        　 16�q�制ASCII表示.
        */
public String digestHexStr;
 
/* digest,是最��C���ơ计���结果的2�q�制内部表示�Q�表�C?28bit的MD5�?
        */
privatebyte[] digest = newbyte[16];
 
/*
          getMD5ofStr是类MD5最主要的公共方法，入口参数是你惌����q�行MD5变换的字�W�串
          �q�回的是变换完的�l�果�Q�这个结果是从公共成员digestHexStr取得的．
        */
public String getMD5ofStr(String inbuf) {
                md5Init();
try{
                  md5Update(inbuf.getBytes("GBK"),
                            inbuf.getBytes("GBK").length);
}
catch (UnsupportedEncodingException ex) {
}
                md5Final();
                digestHexStr = "";
for (int i = 0; i < 16; i++) {
                        digestHexStr += byteHEX(digest[i]);
}
return digestHexStr;
 
}
// �q�是MD5�q�个�cȝ��标准构造函敎ͼ�JavaBean要求有一个public的�ƈ且没有参数的构造函�?/font>
public MD5() {
                md5Init();
 
return;
}
 
 
 
/* md5Init是一个初始化函数�Q�初始化核心(j��)变量�Q�装入标准的�q�L�� */
privatevoid md5Init() {
                count[0] = 0L;
                count[1] = 0L;
///* Load magic initialization constants.
 
                state[0] = 0x67452301L;
                state[1] = 0xefcdab89L;
                state[2] = 0x98badcfeL;
                state[3] = 0x10325476L;
 
return;
}
/* F, G, H ,I �?个基本的MD5函数�Q�在原始的MD5的C实现中，�׃��它们�?br />        ���单的位运���，可能��Z��效率的考虑把它们实现成�?ji��n)宏�Q�在java中，我们把它�?br />     　　实现成了(ji��n)private�Ҏ(gu��)���Q�名字保持了(ji��n)原来C中的�?*/
 
privatelong F(long x, long y, long z) {
return (x & y) | ((~x) & z);
 
}
privatelong G(long x, long y, long z) {
return (x & z) | (y & (~z));
 
}
privatelong H(long x, long y, long z) {
return x ^ y ^ z;
}
 
privatelong I(long x, long y, long z) {
return y ^ (x | (~z));
}
 
/*
          FF,GG,HH和II���调用F,G,H,I�q�行�q�一步变�?br />          FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
          Rotation is separate from addition to prevent recomputation.
       */
 
privatelong FF(long a, long b, long c, long d, long x, long s,
long ac) {
                a += F (b, c, d) + x + ac;
                a = ((int) a << s) | ((int) a >>> (32 - s));
                a += b;
return a;
}
 
privatelong GG(long a, long b, long c, long d, long x, long s,
long ac) {
                a += G (b, c, d) + x + ac;
                a = ((int) a << s) | ((int) a >>> (32 - s));
                a += b;
return a;
}
privatelong HH(long a, long b, long c, long d, long x, long s,
long ac) {
                a += H (b, c, d) + x + ac;
                a = ((int) a << s) | ((int) a >>> (32 - s));
                a += b;
return a;
}
privatelong II(long a, long b, long c, long d, long x, long s,
long ac) {
                a += I (b, c, d) + x + ac;
                a = ((int) a << s) | ((int) a >>> (32 - s));
                a += b;
return a;
}
/*
         md5Update是MD5的主计算�q�程�Q�inbuf是要变换的字节串�Q�inputlen是长度，�q�个
         函数由getMD5ofStr调用�Q�调用之前需要调用md5init�Q�因此把它设计成private�?br />        */
privatevoid md5Update(byte[] inbuf, int inputLen) {
 
int i, index, partLen;
byte[] block = newbyte[64];
                index = (int)(count[0] >>> 3) & 0x3F;
// /* Update number of bits */
if ((count[0] += (inputLen << 3)) < (inputLen << 3))
                        count[1]++;
                count[1] += (inputLen >>> 29);
 
                partLen = 64 - index;
 
// Transform as many times as possible.
if (inputLen >= partLen) {
                        md5Memcpy(buffer, inbuf, index, 0, partLen);
                        md5Transform(buffer);
 
for (i = partLen; i + 63 < inputLen; i += 64) {
 
                                md5Memcpy(block, inbuf, 0, i, 64);
                                md5Transform (block);
}
                        index = 0;
 
}else
 
                        i = 0;
 
///* Buffer remaining input */
                md5Memcpy(buffer, inbuf, index, i, inputLen - i);
 
}
 
/*
          md5Final整理和填写输出结�?br />        */
privatevoid md5Final () {
byte[] bits = newbyte[8];
int index, padLen;
 
///* Save number of bits */
                Encode (bits, count, 8);
 
///* Pad out to 56 mod 64.
                index = (int)(count[0] >>> 3) & 0x3f;
                padLen = (index < 56) ? (56 - index) : (120 - index);
                md5Update (PADDING, padLen);
 
///* Append length (before padding) */
                md5Update(bits, 8);
 
///* Store state in digest */
                Encode (digest, state, 16);
 
}
 
/* md5Memcpy是一个内部��用的byte数组的块拯���函数�Q�从input的inpos开始把len长度�?br />　　　　　 字节拯���到output的outpos位置开�?br />        */
 
privatevoid md5Memcpy (byte[] output, byte[] input,
int outpos, int inpos, int len)
{
int i;
 
for (i = 0; i < len; i++)
                        output[outpos + i] = input[inpos + i];
}
 
/*
           md5Transform是MD5核心(j��)变换�E�序�Q�有md5Update调用�Q�block是分块的原始字节
        */
privatevoid md5Transform (byte block[]) {
long a = state[0], b = state[1], c = state[2], d = state[3];
long[] x = newlong[16];
 
                Decode (x, block, 64);
 
/* Round 1 */
                a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
                d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
                c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
                b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
                a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
                d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
                c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
                b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
                a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
                d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
                c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
                b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
                a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
                d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
                c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
                b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */
 
/* Round 2 */
                a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
                d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
                c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
                b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
                a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
                d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
                c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
                b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
                a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
                d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
                c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
                b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
                a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
                d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
                c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
                b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */
 
/* Round 3 */
                a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
                d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
                c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
                b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
                a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
                d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
                c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
                b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
                a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
                d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
                c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
                b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
                a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
                d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
                c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
                b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */
 
/* Round 4 */
                a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
                d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
                c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
                b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
                a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
                d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
                c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
                b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
                a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
                d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
                c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
                b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
                a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
                d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
                c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
                b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */
 
                state[0] += a;
                state[1] += b;
                state[2] += c;
                state[3] += d;
 
}
 
/*Encode把long数组按顺序拆成byte数组�Q�因为java的long�c�d���?4bit的，
          只拆�?2bit�Q�以适应原始C实现的用�?br />        */
privatevoid Encode (byte[] output, long[] input, int len) {
int i, j;
 
for (i = 0, j = 0; j < len; i++, j += 4) {
                        output[j] = (byte)(input[i] & 0xffL);
                        output[j + 1] = (byte)((input[i] >>> 8) & 0xffL);
                        output[j + 2] = (byte)((input[i] >>> 16) & 0xffL);
                        output[j + 3] = (byte)((input[i] >>> 24) & 0xffL);
}
}
 
/*Decode把byte数组按顺序合成成long数组�Q�因为java的long�c�d���?4bit的，
          只合成低32bit�Q�高32bit清零�Q�以适应原始C实现的用�?br />        */
privatevoid Decode (long[] output, byte[] input, int len) {
int i, j;
 
 
for (i = 0, j = 0; j < len; i++, j += 4)
                        output[i] = b2iu(input[j]) |
                                (b2iu(input[j + 1]) << 8) |
                                (b2iu(input[j + 2]) << 16) |
                                (b2iu(input[j + 3]) << 24);
 
return;
}
 
/*
          b2iu是我写的一个把byte按照不考虑正负��L(f��ng)��原则的＂升位�Q�程序，因�ؓ(f��)java没有unsigned�q�算
        */
publicstaticlong b2iu(byte b) {
return b < 0 ? b & 0x7F + 128 : b;
}
 
/*byteHEX()�Q�用来把一个byte�c�d��的数转换成十六进制的ASCII表示�Q?br />        　因�ؓ(f��)java中的byte的toString无法实现�q�一点，我们又没有C语言中的
          sprintf(outbuf,"%02X",ib)
        */
publicstatic String byteHEX(byte ib) {
char[] Digit = {'0','1','2','3','4','5','6','7','8','9',
'A','B','C','D','E','F'};
char [] ob = newchar[2];
                ob[0] = Digit[(ib >>> 4) & 0X0F];
                ob[1] = Digit[ib & 0X0F];
                String s = new String(ob);
return s;
}
 
publicstaticvoid main(String args[]) {
 
 
                MD5 m = new MD5();
if (Array.getLength(args) == 0) {//如果没有参数�Q�执行标准的Test Suite
 
                               System.out.println("MD5 Test suite:");
                        System.out.println("MD5(\"\"):"+m.getMD5ofStr(""));
                        System.out.println("MD5(\"a\"):"+m.getMD5ofStr("a"));
                        System.out.println("MD5(\"abc\"):"+m.getMD5ofStr("abc"));
                        System.out.println("MD5(\"message digest\"):"+m.getMD5ofStr("message digest"));
                        System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):"+
                        m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz"));
                        System.out.println("MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):"+
                             m.getMD5ofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
}
else
                              System.out.println("MD5(" + args[0] + ")=" + m.getMD5ofStr(args[0]));
 
 
}
 
}

我心(j��)飞翔 2006-10-11 17:25 发表评论

获取�|�卡信息

我心(j��)飞翔 — Wed, 11 Oct 2006 09:23:00 GMT

				
						import
				 java.net.*;
//...
 
        System.out.println("\n+---------------------[ Network Cards ]----------------------+\n");
try
{
for(Enumeration list = NetworkInterface.getNetworkInterfaces(); list.hasMoreElements();)
{
                NetworkInterface iFace = (NetworkInterface)list.nextElement();
                System.out.println("Card:" + iFace.getDisplayName());
                InetAddress adr;
for(Enumeration addresses = iFace.getInetAddresses(); addresses.hasMoreElements(); System.out.println(" -> " + adr.getHostAddress()))
                    adr = (InetAddress)addresses.nextElement();
 
}
 
}
catch(SocketException se)
{
            System.out.println("Failed discovering network cards!");
            System.out.println("Error: " + se);
}

我心(j��)飞翔 2006-10-11 17:23 发表评论

我心(j��)飞翔 — Wed, 11 Oct 2006 09:15:00 GMT

				
						package
				 com.chinajavaworld.util;
 
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
 
publicclass DateTimeUtil
{
 
privatestaticfinalint MAJOR_VERSION = 1;
privatestaticfinalint MINOR_VERSION = 0;
privatestaticfinalint REVISION_VERSION = 1;
privatestaticfinal String showFormat = "yyyy-MM-dd HH:mm:ss";
privatestaticfinal String storeFormat = "yyyyMMddHHmmssSSS";
privatestaticfinal SimpleDateFormat showFormater = new SimpleDateFormat(showFormat);
privatestaticfinal SimpleDateFormat storeFormater = new SimpleDateFormat(storeFormat);
privatestaticfinal SimpleDateFormat formatter1 = new SimpleDateFormat ("yyyy�q�MM月dd�?HH时mm分ss�U?);
privatestaticfinal SimpleDateFormat formatter2 = new SimpleDateFormat ("yyyy�q�MM月dd�?);
privatestaticfinal SimpleDateFormat formatter3 = new SimpleDateFormat ("yyyy-MM-dd HH:mm:ss");
privatestaticfinal SimpleDateFormat formatter4 = new SimpleDateFormat ("yyyy-MM-dd");
privatestaticfinal SimpleDateFormat formatter5 = new SimpleDateFormat ("yyyy/MM/dd");
privatestaticfinal SimpleDateFormat formatter6 = new SimpleDateFormat ("MM-dd HH:mm");
 
public DateTimeUtil()
{
}
 
publicstatic String getNow()
{
return storeFormater.format(new Date());
}
 
publicstatic String getRelativeDate(int days)
{
        Calendar c = Calendar.getInstance();
        c.set(5, c.get(5) + days);
        StringBuffer sb = new StringBuffer(17);
        sb.append(c.get(1));
int tmp[] = {
            c.get(2) + 1, c.get(5), c.get(11), c.get(12), c.get(13), c.get(14)
};
for(int i = 0; i < tmp.length - 1; i++)
            sb.append(tmp[i] >= 10 ? "" : "0").append(tmp[i]);
 
if(tmp[tmp.length - 1] < 10)
            sb.append("0");
if(tmp[tmp.length - 1] < 100)
            sb.append("0");
        sb.append(tmp[tmp.length - 1]);
return sb.toString();
}
 
publicstatic String getNow(String string)
{
return (new SimpleDateFormat(string)).format(new Date());
}
 
publicstatic String getDisplayTime(long time)
{
return showFormater.format(new Date(time));
}
 
publicstatic String getDisplayTime(long time, String string)
{
return (new SimpleDateFormat(string)).format(new Date(time));
}
 
publicstatic String getShowFormat(String time)
{
try
{
if(time == null || time.equals(""))
                time = showFormater.format(new Date());
else
                time = showFormater.format(storeFormater.parse(time));
}
catch(ParseException e)
{
            e.printStackTrace();
}
return time;
}
 
publicstaticlong compare(String t1, String t2)
{
return Long.valueOf(t1).longValue() - Long.valueOf(t2).longValue();
}
 
publicstaticint getYear(String time)
{
return Integer.valueOf(time.substring(0, 4)).intValue();
}
 
publicstaticint getMonth(String time)
{
return Integer.valueOf(time.substring(4, 6)).intValue();
}
 
publicstaticint getDate(String time)
{
return Integer.valueOf(time.substring(6, 8)).intValue();
}
 
publicstaticint getHour(String time)
{
return Integer.valueOf(time.substring(8, 10)).intValue();
}
 
publicstaticint getMinute(String time)
{
return Integer.valueOf(time.substring(10, 12)).intValue();
}
 
publicstaticint getSecond(String time)
{
return Integer.valueOf(time.substring(12, 14)).intValue();
}
 
publicstaticint getMilliSencond(String time)
{
return Integer.valueOf(time.substring(14, 17)).intValue();
}
 
publicstaticlong getTimeStamp(String time)
throws ParseException
{
return storeFormater.parse(time).getTime();
}
 
publicstatic String formatDate1(Date myDate) {
return formatter1.format(myDate);
}
 
publicstatic String formatDate2(Date myDate) {
return formatter2.format(myDate);
}
 
publicstatic String formatDate3(Date myDate) {
return formatter3.format(myDate);
}
 
publicstatic String formatDate4(Date myDate) {
return formatter4.format(myDate);
}
 
publicstatic String formatDate5(Date myDate) {
return formatter5.format(myDate);
}
 
publicstatic String formatDate6(Date myDate) {
return formatter6.format(myDate);
}
 
publicstaticlong getLongTime(String time){
try{
return showFormater.parse(time).getTime();
}
catch (ParseException ex) {
return 0L;
}
}
 
 
publicstatic String getVersion()
{
return"1.0.1";
}
 
publicstaticint getMajor()
{
return 1;
}
 
publicstaticint getMinor()
{
return 0;
}
 
publicstaticint getRevision()
{
return 1;
}
 
}

我心(j��)飞翔 2006-10-11 17:15 发表评论

request参数接收解析

我心(j��)飞翔 — Wed, 11 Oct 2006 09:13:00 GMT

				
						package
				 com.chinajavaworld.util;
 
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
 
publicclass ParamUtils
{
 
public ParamUtils()
{
}
 
publicstatic String getParameter(HttpServletRequest request, String name)
{
return getParameter(request, name, false);
}
 
publicstatic String getParameter(HttpServletRequest request, String name, String defaultValue)
{
return getParameter(request, name, defaultValue, false);
}
 
publicstatic String getParameter(HttpServletRequest request, String name, boolean emptyStringsOK)
{
return getParameter(request, name, null, emptyStringsOK);
}
 
publicstatic String getParameter(HttpServletRequest request, String name, String defaultValue, boolean emptyStringsOK)
{
        String temp = request.getParameter(name);
if(temp != null)
{
if(temp.equals("") && !emptyStringsOK)
return defaultValue;
else
return temp;
}else
{
return defaultValue;
}
}
 
publicstatic String[] getParameters(HttpServletRequest request, String name)
{
if(name == null)
returnnew String[0];
        String paramValues[] = request.getParameterValues(name);
if(paramValues == null || paramValues.length == 0)
returnnew String[0];
        List values = new ArrayList(paramValues.length);
for(int i = 0; i < paramValues.length; i++)
if(paramValues[i] != null && !"".equals(paramValues[i]))
                values.add(paramValues[i]);
 
return (String[])values.toArray(new String[0]);
}
 
publicstaticboolean getBooleanParameter(HttpServletRequest request, String name)
{
return getBooleanParameter(request, name, false);
}
 
publicstaticboolean getBooleanParameter(HttpServletRequest request, String name, boolean defaultVal)
{
        String temp = request.getParameter(name);
if("true".equals(temp) || "on".equals(temp))
returntrue;
if("false".equals(temp) || "off".equals(temp))
returnfalse;
else
return defaultVal;
}
 
publicstaticint getIntParameter(HttpServletRequest request, String name, int defaultNum)
{
        String temp = request.getParameter(name);
if(temp != null && !temp.equals(""))
{
int num = defaultNum;
try
{
                num = Integer.parseInt(temp.trim());
}
catch(Exception ignored) {}
return num;
}else
{
return defaultNum;
}
}
 
publicstaticint[] getIntParameters(HttpServletRequest request, String name, int defaultNum)
{
        String paramValues[] = request.getParameterValues(name);
if(paramValues == null || paramValues.length == 0)
returnnewint[0];
int values[] = newint[paramValues.length];
for(int i = 0; i < paramValues.length; i++)
try
{
                values[i] = Integer.parseInt(paramValues[i].trim());
}
catch(Exception e)
{
                values[i] = defaultNum;
}
 
return values;
}
 
publicstaticdouble getDoubleParameter(HttpServletRequest request, String name, double defaultNum)
{
        String temp = request.getParameter(name);
if(temp != null && !temp.equals(""))
{
double num = defaultNum;
try
{
                num = Double.parseDouble(temp.trim());
}
catch(Exception ignored) {}
return num;
}else
{
return defaultNum;
}
}
 
publicstaticlong getLongParameter(HttpServletRequest request, String name, long defaultNum)
{
        String temp = request.getParameter(name);
if(temp != null && !temp.equals(""))
{
long num = defaultNum;
try
{
                num = Long.parseLong(temp.trim());
}
catch(Exception ignored) {}
return num;
}else
{
return defaultNum;
}
}
 
publicstaticlong[] getLongParameters(HttpServletRequest request, String name, long defaultNum)
{
        String paramValues[] = request.getParameterValues(name);
if(paramValues == null || paramValues.length == 0)
returnnewlong[0];
long values[] = newlong[paramValues.length];
for(int i = 0; i < paramValues.length; i++)
try
{
                values[i] = Long.parseLong(paramValues[i].trim());
}
catch(Exception e)
{
                values[i] = defaultNum;
}
 
return values;
}
 
publicstatic String getAttribute(HttpServletRequest request, String name)
{
return getAttribute(request, name, false);
}
 
publicstatic String getAttribute(HttpServletRequest request, String name, boolean emptyStringsOK)
{
        String temp = (String)request.getAttribute(name);
if(temp != null)
{
if(temp.equals("") && !emptyStringsOK)
returnnull;
else
return temp;
}else
{
returnnull;
}
}
 
publicstaticboolean getBooleanAttribute(HttpServletRequest request, String name)
{
        String temp = (String)request.getAttribute(name);
return temp != null && temp.equals("true");
}
 
publicstaticint getIntAttribute(HttpServletRequest request, String name, int defaultNum)
{
        String temp = (String)request.getAttribute(name);
if(temp != null && !temp.equals(""))
{
int num = defaultNum;
try
{
                num = Integer.parseInt(temp.trim());
}
catch(Exception ignored) {}
return num;
}else
{
return defaultNum;
}
}
 
publicstaticlong getLongAttribute(HttpServletRequest request, String name, long defaultNum)
{
        String temp = (String)request.getAttribute(name);
if(temp != null && !temp.equals(""))
{
long num = defaultNum;
try
{
                num = Long.parseLong(temp.trim());
}
catch(Exception ignored) {}
return num;
}else
{
return defaultNum;
}
}
}

我心(j��)飞翔 2006-10-11 17:13 发表评论

字符串处理等常用�Ҏ(gu��)��

我心(j��)飞翔 — Wed, 11 Oct 2006 09:11:00 GMT

package com.chinajavaworld.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.BreakIterator;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.io.File;

public class StringUtils
{
private final static String BR_TAG = "
";

    private StringUtils()
    {
    }

    /**
     * This method takes a string which may contain newline characters
     * '\n' which it converts to html newline tags.
     *
     * @param input The text to be converted.
     * @return The input string with the newline character '\n' replaced
     * with
.
     */
    public static final String convertNewlines(String input) {
      return replace(replace(input, "\r\n", BR_TAG), "\n", BR_TAG);
    }

    public static final String backConvertNewlines(String input) {
      return replaceIgnoreCase(input, BR_TAG, "\n");
    }

    public static final String replace(String string, String oldString, String newString)
    {
        if(string == null)
            return null;
        if(newString == null)
            return string;
        int i = 0;
        if((i = string.indexOf(oldString, i)) >= 0)
        {
            char string2[] = string.toCharArray();
            char newString2[] = newString.toCharArray();
            int oLength = oldString.length();
            StringBuffer buf = new StringBuffer(string2.length);
            buf.append(string2, 0, i).append(newString2);
            i += oLength;
            int j;
            for(j = i; (i = string.indexOf(oldString, i)) > 0; j = i)
            {
                buf.append(string2, j, i - j).append(newString2);
                i += oLength;
            }

            buf.append(string2, j, string2.length - j);
            return buf.toString();
        } else
        {
            return string;
        }
    }

    public static final String replaceIgnoreCase(String line, String oldString, String newString)
    {
        if(line == null)
            return null;
        String lcLine = line.toLowerCase();
        String lcOldString = oldString.toLowerCase();
        int i = 0;
        if((i = lcLine.indexOf(lcOldString, i)) >= 0)
        {
            char line2[] = line.toCharArray();
            char newString2[] = newString.toCharArray();
            int oLength = oldString.length();
            StringBuffer buf = new StringBuffer(line2.length);
            buf.append(line2, 0, i).append(newString2);
            i += oLength;
            int j;
            for(j = i; (i = lcLine.indexOf(lcOldString, i)) > 0; j = i)
            {
                buf.append(line2, j, i - j).append(newString2);
                i += oLength;
            }

            buf.append(line2, j, line2.length - j);
            return buf.toString();
        } else
        {
            return line;
        }
    }

    public static final String replaceIgnoreCase(String line, String oldString, String newString, int count[])
    {
        if(line == null)
            return null;
        String lcLine = line.toLowerCase();
        String lcOldString = oldString.toLowerCase();
        int i = 0;
        if((i = lcLine.indexOf(lcOldString, i)) >= 0)
        {
            int counter = 1;
            char line2[] = line.toCharArray();
            char newString2[] = newString.toCharArray();
            int oLength = oldString.length();
            StringBuffer buf = new StringBuffer(line2.length);
            buf.append(line2, 0, i).append(newString2);
            i += oLength;
            int j;
            for(j = i; (i = lcLine.indexOf(lcOldString, i)) > 0; j = i)
            {
                counter++;
                buf.append(line2, j, i - j).append(newString2);
                i += oLength;
            }

            buf.append(line2, j, line2.length - j);
            count[0] = counter;
            return buf.toString();
        } else
        {
            return line;
        }
    }

    public static final String replace(String line, String oldString, String newString, int count[])
    {
        if(line == null)
            return null;
        int i = 0;
        if((i = line.indexOf(oldString, i)) >= 0)
        {
            int counter = 1;
            char line2[] = line.toCharArray();
            char newString2[] = newString.toCharArray();
            int oLength = oldString.length();
            StringBuffer buf = new StringBuffer(line2.length);
            buf.append(line2, 0, i).append(newString2);
            i += oLength;
            int j;
            for(j = i; (i = line.indexOf(oldString, i)) > 0; j = i)
            {
                counter++;
                buf.append(line2, j, i - j).append(newString2);
                i += oLength;
            }

            buf.append(line2, j, line2.length - j);
            count[0] = counter;
            return buf.toString();
        } else
        {
            return line;
        }
    }

    public static final boolean hasBadwordsIgnoreCase(String line, String oldString)
    {
        if(line == null)
            return false;
        String lcLine = line.toLowerCase();
        String lcOldString = oldString.toLowerCase();
        int i = 0;
        if((i = lcLine.indexOf(lcOldString, i)) >= 0)
        {
            return true;
        } else
        {
            return false;
        }
    }

    public static final String stripTags(String in)
    {
        if(in == null)
            return null;
        else
            return stripTags(in, false);
    }

    public static final String stripTags(String in, boolean stripBRTag)
    {
        if(in == null)
            return null;
        int i = 0;
        int last = 0;
        char input[] = in.toCharArray();
        int len = input.length;
        StringBuffer out = new StringBuffer((int)((double)len * 1.3D));
        for(; i < len; i++)
        {
            char ch = input[i];
            if(ch > '>')
                continue;
            if(ch == '<')
            {
                if(!stripBRTag && i + 3 < len && input[i + 1] == 'b' && input[i + 2] == 'r' && input[i + 3] == '>')
                {
                    i += 3;
                    continue;
                }
                if(i > last)
                {
                    if(last > 0)
                        out.append(" ");
                    out.append(input, last, i - last);
                }
                last = i + 1;
                continue;
            }
            if(ch == '>')
                last = i + 1;
        }

        if(last == 0)
            return in;
        if(i > last)
            out.append(input, last, i - last);
        return out.toString();
    }

    public static final String escapeHTMLTags(String in)
    {
        if(in == null)
            return null;
        int i = 0;
        int last = 0;
        char input[] = in.toCharArray();
        int len = input.length;
        StringBuffer out = new StringBuffer((int)((double)len * 1.3D));
        for(; i < len; i++)
        {
            char ch = input[i];
            if(ch > '>')
                continue;
            if(ch == '<')
            {
                if(i > last)
                    out.append(input, last, i - last);
                last = i + 1;
                out.append(LT_ENCODE);
                continue;
            }
            if(ch == '>')
            {
                if(i > last)
                    out.append(input, last, i - last);
                last = i + 1;
                out.append(GT_ENCODE);
                continue;
            }
            if(ch != '"')
                continue;
            if(i > last)
                out.append(input, last, i - last);
            last = i + 1;
            out.append(QUOTE_ENCODE);
        }

        if(last == 0)
            return in;
        if(i > last)
            out.append(input, last, i - last);
        return out.toString();
    }

    public static final synchronized String hash(String data)
    {
        if(digest == null)
            try
            {
                digest = MessageDigest.getInstance("MD5");
            }
            catch(NoSuchAlgorithmException nsae)
            {
                //Log.error(e);
            }
        try
        {
            digest.update(data.getBytes("utf-8"));
        }
        catch(UnsupportedEncodingException e)
        {
            //Log.error(e);
        }
        return encodeHex(digest.digest());
    }

    public static final String encodeHex(byte bytes[])
    {
        StringBuffer buf = new StringBuffer(bytes.length * 2);
        for(int i = 0; i < bytes.length; i++)
        {
            if((bytes[i] & 0xff) < 16)
                buf.append("0");
            buf.append(Long.toString(bytes[i] & 0xff, 16));
        }

        return buf.toString();
    }

    public static final byte[] decodeHex(String hex)
    {
        char chars[] = hex.toCharArray();
        byte bytes[] = new byte[chars.length / 2];
        int byteCount = 0;
        for(int i = 0; i < chars.length; i += 2)
        {
            int newByte = 0;
            newByte |= hexCharToByte(chars[i]);
            newByte <<= 4;
            newByte |= hexCharToByte(chars[i + 1]);
            bytes[byteCount] = (byte)newByte;
            byteCount++;
        }

        return bytes;
    }

    private static final byte hexCharToByte(char ch)
    {
        switch(ch)
        {
        case 48: // '0'
            return 0;

        case 49: // '1'
            return 1;

        case 50: // '2'
            return 2;

        case 51: // '3'
            return 3;

        case 52: // '4'
            return 4;

        case 53: // '5'
            return 5;

        case 54: // '6'
            return 6;

        case 55: // '7'
            return 7;

        case 56: // '8'
            return 8;

        case 57: // '9'
            return 9;

        case 97: // 'a'
            return 10;

        case 98: // 'b'
            return 11;

        case 99: // 'c'
            return 12;

        case 100: // 'd'
            return 13;

        case 101: // 'e'
            return 14;

        case 102: // 'f'
            return 15;

        case 58: // ':'
        case 59: // ';'
        case 60: // '<'
        case 61: // '='
        case 62: // '>'
        case 63: // '?'
        case 64: // '@'
        case 65: // 'A'
        case 66: // 'B'
        case 67: // 'C'
        case 68: // 'D'
        case 69: // 'E'
        case 70: // 'F'
        case 71: // 'G'
        case 72: // 'H'
        case 73: // 'I'
        case 74: // 'J'
        case 75: // 'K'
        case 76: // 'L'
        case 77: // 'M'
        case 78: // 'N'
        case 79: // 'O'
        case 80: // 'P'
        case 81: // 'Q'
        case 82: // 'R'
        case 83: // 'S'
        case 84: // 'T'
        case 85: // 'U'
        case 86: // 'V'
        case 87: // 'W'
        case 88: // 'X'
        case 89: // 'Y'
        case 90: // 'Z'
        case 91: // '['
        case 92: // '\\'
        case 93: // ']'
        case 94: // '^'
        case 95: // '_'
        case 96: // '`'
        default:
            return 0;
        }
    }

    public static String encodeBase64(String data)
    {
        byte bytes[] = null;
        try
        {
            bytes = data.getBytes("UTF-8");
        }
        catch(UnsupportedEncodingException uee)
        {
            //Log.error(uee);
        }
        return encodeBase64(bytes);
    }

    public static String decodeBase64(String data)
    {
        byte[] bytes = null;
        try {
          bytes = data.getBytes("UTF-8");
          return new String(decodeBase64(bytes), "UTF-8");
        }
        catch (UnsupportedEncodingException ex) {
        }
        return "";
    }

    public static String encodeBase64(byte data[])
    {
        boolean lineSep = false;
        int sLen = data == null ? 0 : data.length;
        if(sLen == 0)
            return new String("");
        int eLen = (sLen / 3) * 3;
        int cCnt = (sLen - 1) / 3 + 1 << 2;
        int dLen = cCnt + (lineSep ? (cCnt - 1) / 76 << 1 : 0);
        char dArr[] = new char[dLen];
        int s = 0;
        int d = 0;
        int cc = 0;
        do
        {
            if(s >= eLen)
                break;
            int i = (data[s++] & 0xff) << 16 | (data[s++] & 0xff) << 8 | data[s++] & 0xff;
            dArr[d++] = CA[i >>> 18 & 0x3f];
            dArr[d++] = CA[i >>> 12 & 0x3f];
            dArr[d++] = CA[i >>> 6 & 0x3f];
            dArr[d++] = CA[i & 0x3f];
            if(lineSep && ++cc == 19 && d < dLen - 2)
            {
                dArr[d++] = '\r';
                dArr[d++] = '\n';
                cc = 0;
            }
        } while(true);
        int left = sLen - eLen;
        if(left > 0)
        {
            int i = (data[eLen] & 0xff) << 10 | (left != 2 ? 0 : (data[sLen - 1] & 0xff) << 2);
            dArr[dLen - 4] = CA[i >> 12];
            dArr[dLen - 3] = CA[i >>> 6 & 0x3f];
            dArr[dLen - 2] = left != 2 ? '=' : CA[i & 0x3f];
            dArr[dLen - 1] = '=';
        }
        return new String(dArr);
    }

    public static final byte[] decodeBase64(byte bytes[])
    {
        int sLen = bytes.length;
        int sepCnt = 0;
        for(int i = 0; i < sLen; i++)
            if(IA[bytes[i] & 0xff] < 0)
                sepCnt++;

        if((sLen - sepCnt) % 4 != 0)
            return null;
        int pad = 0;
        int i = sLen;
        do
        {
            if(i <= 1 || IA[bytes[--i] & 0xff] > 0)
                break;
            if(bytes[i] == 61)
                pad++;
        } while(true);
        int len = ((sLen - sepCnt) * 6 >> 3) - pad;
        byte dArr[] = new byte[len];
        int s = 0;
        int d = 0;
        do
        {
            if(d >= len)
                break;
            i = 0;
            for(int j = 0; j < 4; j++)
            {
                int c = IA[bytes[s++] & 0xff];
                if(c >= 0)
                    i |= c << 18 - j * 6;
                else
                    j--;
            }

            dArr[d++] = (byte)(i >> 16);
            if(d < len)
            {
                dArr[d++] = (byte)(i >> 8);
                if(d < len)
                    dArr[d++] = (byte)i;
            }
        } while(true);
        return dArr;
    }

    public static String URLEncode(String original, String charset)
        throws UnsupportedEncodingException
    {
        if(original == null)
            return null;
        byte octets[];
        try
        {
            octets = original.getBytes(charset);
        }
        catch(UnsupportedEncodingException error)
        {
            throw new UnsupportedEncodingException();
        }
        StringBuffer buf = new StringBuffer(octets.length);
        for(int i = 0; i < octets.length; i++)
        {
            char c = (char)octets[i];
            if(allowed_query.get(c))
            {
                buf.append(c);
            } else
            {
                buf.append('%');
                byte b = octets[i];
                char hexadecimal = Character.forDigit(b >> 4 & 0xf, 16);
                buf.append(Character.toUpperCase(hexadecimal));
                hexadecimal = Character.forDigit(b & 0xf, 16);
                buf.append(Character.toUpperCase(hexadecimal));
            }
        }

        return buf.toString();
    }

    public static final String[] toLowerCaseWordArray(String text)
    {
        if(text == null || text.length() == 0)
            return new String[0];
        ArrayList wordList = new ArrayList();
        BreakIterator boundary = BreakIterator.getWordInstance();
        boundary.setText(text);
        int start = 0;
        for(int end = boundary.next(); end != -1; end = boundary.next())
        {
            String tmp = text.substring(start, end).trim();
            tmp = replace(tmp, "+", "");
            tmp = replace(tmp, "/", "");
            tmp = replace(tmp, "\\", "");
            tmp = replace(tmp, "#", "");
            tmp = replace(tmp, "*", "");
            tmp = replace(tmp, ")", "");
            tmp = replace(tmp, "(", "");
            tmp = replace(tmp, "&", "");
            if(tmp.length() > 0)
                wordList.add(tmp);
            start = end;
        }

        return (String[])wordList.toArray(new String[wordList.size()]);
    }

    public static final String randomString(int length)
    {
        if(length < 1)
            return null;
        char randBuffer[] = new char[length];
        for(int i = 0; i < randBuffer.length; i++)
            randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];

        return new String(randBuffer);
    }

    public static final int randomInt(int number)
    {
        if(number>0)
            return randGen.nextInt(number)+1;
        else
            return 1;
    }

    public static final String chop(String string, int length)
    {
        if(string == null)
            return null;
        if(length <= 0)
            throw new IllegalArgumentException("Length must be > 0");
        if(string.length() <= length + 2)
        {
            return string;
        } else
        {
            StringBuffer buf = new StringBuffer(string.substring(0, length));
            buf.append("...");
            return buf.toString();
        }
    }

    public static final String chopAtWord(String string, int length, int minLength)
    {
        if(length < 2)
            throw new IllegalArgumentException("Length specified (" + length + ") must be > 2");
        if(minLength >= length)
            throw new IllegalArgumentException("minLength must be smaller than length");
        int sLength = string != null ? string.length() : -1;
        if(sLength < 1)
            return string;
        if(minLength != -1 && sLength < minLength)
            return string;
        if(minLength == -1 && sLength < length)
            return string;
        char charArray[] = string.toCharArray();
        if(sLength > length)
        {
            sLength = length;
            for(int i = 0; i < sLength - 1; i++)
            {
                if(charArray[i] == '\r' && charArray[i + 1] == '\n')
                    return string.substring(0, i + 1);
                if(charArray[i] == '\n')
                    return string.substring(0, i);
            }

            if(charArray[sLength - 1] == '\n')
                return string.substring(0, sLength - 1);
            for(int i = sLength - 1; i > 0; i--)
                if(charArray[i] == ' ')
                    return string.substring(0, i).trim();

        } else
        if(minLength != -1 && sLength > minLength)
        {
            for(int i = 0; i < minLength; i++)
                if(charArray[i] == ' ')
                    return string;

        }
        if(minLength > -1 && minLength <= string.length())
            return string.substring(0, minLength);
        else
            return string.substring(0, length);
    }

    public static final String chopAtWord(String string, int length)
    {
        return chopAtWord(string, length, -1);
    }

    public static String chopAtWordsAround(String input, String wordList[], int numChars)
    {
        if(input == null || "".equals(input.trim()) || wordList == null || wordList.length == 0 || numChars == 0)
            return "";
        String lc = input.toLowerCase();
        for(int i = 0; i < wordList.length; i++)
        {
            int pos = lc.indexOf(wordList[i]);
            if(pos > -1)
            {
                int beginIdx = pos - numChars;
                if(beginIdx < 0)
                    beginIdx = 0;
                int endIdx = pos + numChars;
                if(endIdx > input.length() - 1)
                    endIdx = input.length() - 1;
                char chars[];
                for(chars = input.toCharArray(); beginIdx > 0 && chars[beginIdx] != ' ' && chars[beginIdx] != '\n' && chars[beginIdx] != '\r'; beginIdx--);
                for(; endIdx < input.length() && chars[endIdx] != ' ' && chars[endIdx] != '\n' && chars[endIdx] != '\r'; endIdx++);
                return input.substring(beginIdx, endIdx);
            }
        }

        return input.substring(0, input.length() < 200 ? input.length() : 200);
    }

    public static final String highlightWords(String string, String words[], String startHighlight, String endHighlight)
    {
        if(string == null || words == null || startHighlight == null || endHighlight == null)
            return null;
        StringBuffer regexp = new StringBuffer();
        regexp.append("(?i)\\b(");
        for(int x = 0; x < words.length; x++)
        {
            words[x] = words[x].replaceAll("([\\$\\?\\|\\/\\.])", "\\\\$1");
            regexp.append(words[x]);
            if(x != words.length - 1)
                regexp.append("|");
        }

        regexp.append(")");
        return string.replaceAll(regexp.toString(), startHighlight + "$1" + endHighlight);
    }

    public static final String escapeForSQL(String string)
    {
        if(string == null)
            return null;
        if(string.length() == 0)
            return string;
        char input[] = string.toCharArray();
        int i = 0;
        int last = 0;
        int len = input.length;
        StringBuffer out = null;
        for(; i < len; i++)
        {
            char ch = input[i];
            if(ch != '\'')
                continue;
            if(out == null)
                out = new StringBuffer(len + 2);
            if(i > last)
                out.append(input, last, i - last);
            last = i + 1;
            out.append('\'').append('\'');
        }

        if(out == null)
            return string;
        if(i > last)
            out.append(input, last, i - last);
        return out.toString();
    }

    public static final String escapeForXML(String string)
    {
        if(string == null)
            return null;
        int i = 0;
        int last = 0;
        char input[] = string.toCharArray();
        int len = input.length;
        StringBuffer out = new StringBuffer((int)((double)len * 1.3D));
        for(; i < len; i++)
        {
            char ch = input[i];
            if(ch > '>')
                continue;
            if(ch == '<')
            {
                if(i > last)
                    out.append(input, last, i - last);
                last = i + 1;
                out.append(LT_ENCODE);
                continue;
            }
            if(ch == '>')
            {
                if(i > last)
                    out.append(input, last, i - last);
                last = i + 1;
                out.append(GT_ENCODE);
                continue;
            }
            if(ch == '&')
            {
                if(i > last)
                    out.append(input, last, i - last);
                last = i + 1;
                out.append(AMP_ENCODE);
                continue;
            }
            if(ch == '"')
            {
                if(i > last)
                    out.append(input, last, i - last);
                last = i + 1;
                out.append(QUOTE_ENCODE);
                continue;
            }
            if(ch == '\n' || ch == '\r' || ch == '\t' || ch >= ' ')
                continue;
            if(i > last)
                out.append(input, last, i - last);
            last = i + 1;
        }

        if(last == 0)
            return string;
        if(i > last)
            out.append(input, last, i - last);
        return out.toString();
    }

    public static final String unescapeFromXML(String string)
    {
        string = replace(string, "<", "<");
        string = replace(string, ">", ">");
        string = replace(string, """, "\"");
        return replace(string, "&", "&");
    }

    public static final String zeroPadString(String string, int length)
    {
        if(string == null || string.length() > length)
        {
            return string;
        } else
        {
            StringBuffer buf = new StringBuffer(length);
            buf.append(zeroArray, 0, length - string.length()).append(string);
            return buf.toString();
        }
    }

    public static final String Encode(String input,String encode){
      if(input==null || "".equals(input)) return input;
      try {
        return new String(input.getBytes("iso-8859-1"), encode);
      }
      catch (UnsupportedEncodingException ex) {
        return "";
      }
    }

    public static final String getFileExtName(String filename)
    {
        String ext = "";
        int p = filename.lastIndexOf(".");
        if (p != -1)
        {
            ext = filename.substring(p + 1, filename.length());
        }
        return ext.toLowerCase();
    }

    public static final String getPath(long id)
    {
        String returnStr = "";
        char charArray[] = String.valueOf(id).toCharArray();
        int j = charArray.length;
        for (int i = 0; i < j; i++)
        {
            returnStr += charArray[i] + File.separator;
        }
        return returnStr;
    }

    public static final String getUrlPath(long id)
    {
        String returnStr = "";
        char charArray[] = String.valueOf(id).toCharArray();
        int j = charArray.length;
        for (int i = 0; i < j; i++)
        {
            returnStr += charArray[i] + "/";
        }
        return returnStr;
    }

    public static final String dateToMillis(Date date)
    {
      return "";
        /*if(ConnectionManager.getDateType() == 12)
            return zeroPadString(Long.toString(date.getTime()), 15);
        else
            return Long.toString(date.getTime());*/
    }

    /**
     * @param len 需要显�C�的长度(注意�Q�长度是以byte为单位的�Q�一个汉字是2个byte)
     * @param symbol 用于表示省略的信息的字符�Q�如�?..�?�?gt;>>”等�?br />     * @return �q�回处理后的字符�?br />     */
    public static String getLimitLengthString(String str,int len, String symbol) throws
            UnsupportedEncodingException
    {
        if(str==null || "".equals(str)) return str;
        int counterOfDoubleByte;
        byte b[];
        counterOfDoubleByte = 0;
        b = str.getBytes("GBK");
        if (b.length <= len)
            return str;
        for (int i = 0; i < len; i++)
        {
            if (b[i] < 0)
                counterOfDoubleByte++;
        }

        if (counterOfDoubleByte % 2 == 0)
            return new String(b, 0, len, "GBK") + symbol;
        else
            return new String(b, 0, len - 1, "GBK") + symbol;
    }

    public static boolean isValidEmailAddress(String addr)
    {
        if(addr == null)
            return false;
        addr = addr.trim();
        if(addr.length() == 0)
            return false;
        Matcher matcher = basicAddressPattern.matcher(addr);
        if(!matcher.matches())
            return false;
        String userPart = matcher.group(1);
        String domainPart = matcher.group(2);
        matcher = validUserPattern.matcher(userPart);
        if(!matcher.matches())
            return false;
        matcher = ipDomainPattern.matcher(domainPart);
        if(matcher.matches())
        {
            for(int i = 1; i < 5; i++)
            {
                String num = matcher.group(i);
                if(num == null)
                    return false;
                if(Integer.parseInt(num) > 254)
                    return false;
            }

            return true;
        }
        matcher = domainPattern.matcher(domainPart);
        if(matcher.matches())
        {
            String tld = matcher.group(matcher.groupCount());
            matcher = tldPattern.matcher(tld);
            return tld.length() == 3 || matcher.matches();
        } else
        {
            return false;
        }
    }

    /**
     * 判断是否为数字组成的字串
     * @param validString 要判断的字符�?br />     * @return boolen��|��true或false
     */
    public static boolean isNumber(String validString){
      try
      {
        if (validString == null)
          return false;
        byte[] tempbyte = validString.getBytes();
        for (int i = 0; i < validString.length(); i++) {
          //by=tempbyte[i];
          if ( (tempbyte[i] < 48) || (tempbyte[i] > 57)) {
            return false;
          }
        }
        return true;
      }
      catch(Exception ex)
      {
        return false;
      }
}

    private static final char QUOTE_ENCODE[] = """.toCharArray();
    private static final char AMP_ENCODE[] = "&".toCharArray();
    private static final char LT_ENCODE[] = "<".toCharArray();
    private static final char GT_ENCODE[] = ">".toCharArray();
    private static Pattern basicAddressPattern;
    private static Pattern validUserPattern;
    private static Pattern domainPattern;
    private static Pattern ipDomainPattern;
    private static Pattern tldPattern;
    private static MessageDigest digest = null;
    private static final char CA[];
    private static final int IA[];
    private static final BitSet allowed_query;
    private static Random randGen = new Random();
    private static char numbersAndLetters[] = "0123456789abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
    private static final char zeroArray[] = "0000000000000000000000000000000000000000000000000000000000000000".toCharArray();
    private static MD5 md5 = new MD5();

    static
    {
        String basicAddress = "^([\\w\\.-]+)@([\\w\\.-]+)$";
        String specialChars = "\$\$><@,;:\\\\\\\"\\.\\[\\]";
        String validChars = "[^ \f\n\r\t" + specialChars + "]";
        String atom = validChars + "+";
        String quotedUser = "(\"[^\"]+\")";
        String word = "(" + atom + "|" + quotedUser + ")";
        String validUser = "^" + word + "(\\." + word + ")*$";
        String domain = "^" + atom + "(\\." + atom + ")+$";
        String ipDomain = "^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$";
        String knownTLDs = "^\\.(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$";
        basicAddressPattern = Pattern.compile(basicAddress, 2);
        validUserPattern = Pattern.compile(validUser, 2);
        domainPattern = Pattern.compile(domain, 2);
        ipDomainPattern = Pattern.compile(ipDomain, 2);
        tldPattern = Pattern.compile(knownTLDs, 2);
        CA = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
        IA = new int[256];
        Arrays.fill(IA, -1);
        int i = 0;
        for(int iS = CA.length; i < iS; i++)
            IA[CA[i]] = i;

        IA[61] = 0;
        allowed_query = new BitSet(256);
        for(i = 48; i <= 57; i++)
            allowed_query.set(i);

        for(i = 97; i <= 122; i++)
            allowed_query.set(i);

        for(i = 65; i <= 90; i++)
            allowed_query.set(i);

        allowed_query.set(45);
        allowed_query.set(95);
        allowed_query.set(46);
        allowed_query.set(33);
        allowed_query.set(126);
        allowed_query.set(42);
        allowed_query.set(39);
        allowed_query.set(40);
        allowed_query.set(41);

    }
}

我心(j��)飞翔 2006-10-11 17:11 发表评论

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