??xml version="1.0" encoding="utf-8" standalone="yes"?> 在test.war 下徏WEB-INF文g?/p>
在WEB-INF下徏classes文g夹和web.xml 二、运?br />在C:\jboss-3.2.1_tomcat-4.1.24\bin下点击run.batq行?br />试Ҏ(gu)如下Q?br />http://localhost:8080/jmx-console sun.net.ftp.FtpClient 可以帮助我们q行一些简单的ftp客户端功能:(x)下蝲、上传文件?/p>
但如遇到创徏目录之类的就无能为力?jin),我们只好利用W三Ҏ(gu)码,比如 com.enterprisedt.net.ftp.FTPClient 下面写一些sun.net.ftp.FtpClient 的用方法?/p>
1、引入包 2、我们徏一个叫做FtpUtil的class
看到jmx agent view
表示成功
?servlet的测?br />
Q?Q测试程序:(x)helloworld.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class helloworld extends HttpServlet
{
public void doGet(HttpServletRequest request,HttpServletResponse response)throws I(yng)OException,ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><head><title>");
out.println("This is my first Servlet");
out.println("</title></head><body>");
out.println("<h1>Hello,World!</h1>");
out.println("</body></html>");
}
}
~译
javac helloworld.java
java helloworld
生成的helloworld.class文g攑֜classes目录下?br />Q?Q?br />配置web.xml文g如下Q?br />
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, I(yng)nc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>helloworld</servlet-name>
<servlet-class>helloworld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>helloworld</servlet-name>
<url-pattern>/helloworld</url-pattern>
</servlet-mapping>
</web-app>
(3) 通过调用http://localhost:8080/test/helloworld可以看到hello world的输?
]]>
但是如果要排序的?如下的语句:(x)
select * from tablename where rownum<=10 order by name.
却不能达到我们想要的效果Q这个语句执行结果是取了(jin)Q0条数据,然后排序Q而不是先排序再取前1Q条Q这样就需要我们加入子查询Q?br />select * from (select * from tablename order by name) where rownum<10
另外rownum的用是不允许我们用Q?gt;Q的Q如果我要显C第二页Q即10-20条数据,不能?br />select * from (select * from tablename order by name) where rownum>10 and rownum<20
?br />select * from (select * from tablename order by name) where rownum between 10 and 20
q样的话我们只能另想办法解决Q解x法如下:(x)
select * from(
select rownum rowno,t.* from
(select *
from tablename
order by name) t
where rownum<6)where rowno>2;
但是q样的话也会(x)影响到速度Q各位如果有好的Ҏ(gu)可以一h讨下Q?img src ="http://www.aygfsteel.com/lxr5224/aggbug/94463.html" width = "1" height = "1" />
]]>
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import sun.net.*;
import sun.net.ftp.FtpClient;
* connectServer
* q接ftp服务?
* @throws java.io.IOException
* @param path 文g夹,IZ表根目录
* @param password 密码
* @param user 登陆用户
* @param server 服务器地址
*/
public void connectServer(String server, String user, String password, String path)
throws I(yng)OException
{
// serverQFTP服务器的IP地址Quser:dFTP服务器的用户?
// passwordQ登录FTP服务器的用户名的口o(h)QpathQFTP服务器上的\?
ftpClient = new FtpClient();
ftpClient.openServer(server);
ftpClient.login(user, password);
//path是ftp服务下主目录的子目录
if (path.length() != 0) ftpClient.cd(path);
//?q制上传、下?
ftpClient.binary();
}
/**
* upload
* 上传文g
* @throws java.lang.Exception
* @return -1 文g不存?
* -2 文g内容为空
* >0 成功上传Q返回文件的大小
* @param newname 上传后的新文件名
* @param filename 上传的文?
*/
public long upload(String filename,String newname) throws Exception
{
long result = 0;
TelnetOutputStream os = null;
FileInputStream is = null;
try {
java.io.File file_in = new java.io.File(filename);
if (!file_in.exists()) return -1;
if (file_in.length()==0) return -2;
os = ftpClient.put(newname);
result = file_in.length();
is = new FileInputStream(file_in);
byte[] bytes = new byte[1024];
int c;
while ((c = is.read(bytes)) != -1) {
os.write(bytes, 0, c);
}
} finally {
if (is != null) {
is.close();
}
if (os != null) {
os.close();
}
}
return result;
}
/**
* upload
* @throws java.lang.Exception
* @return
* @param filename
*/
public long upload(String filename)
throws Exception
{
String newname = "";
if (filename.indexOf("/")>-1)
{
newname = filename.substring(filename.lastIndexOf("/")+1);
}else
{
newname = filename;
}
return upload(filename,newname);
}
/**
* download
* 从ftp下蝲文g到本?
* @throws java.lang.Exception
* @return
* @param newfilename 本地生成的文件名
* @param filename 服务器上的文件名
*/
public long download(String filename,String newfilename)
throws Exception
{
long result = 0;
TelnetInputStream is = null;
FileOutputStream os = null;
try
{
is = ftpClient.get(filename);
java.io.File outfile = new java.io.File(newfilename);
os = new FileOutputStream(outfile);
byte[] bytes = new byte[1024];
int c;
while ((c = is.read(bytes)) != -1) {
os.write(bytes, 0, c);
result = result + c;
}
} catch (IOException e)
{
e.printStackTrace();
}
finally {
if (is != null) {
is.close();
}
if (os != null) {
os.close();
}
}
return result;
}
/**
* 取得某个目录下的所有文件列?
*
*/
public List getFileList(String path)
{
List list = new ArrayList();
try
{
DataInputStream dis = new DataInputStream(ftpClient.nameList(path));
String filename = "";
while((filename=dis.readLine())!=null)
{
list.add(filename);
}
} catch (Exception e)
{
e.printStackTrace();
}
return list;
}
/**
* closeServer
* 断开与ftp服务器的链接
* @throws java.io.IOException
*/
public void closeServer()
throws I(yng)OException
{
try
{
if (ftpClient != null)
{
ftpClient.closeServer();
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String [] args) throws Exception
{
FtpUtil ftp = new FtpUtil();
try {
//q接ftp服务?
ftp.connectServer("10.163.7.15", "cxl", "1", "info2");
/** 上传文g刊Winfo2 文g夹下 */
System.out.println("filesize:"+ftp.upload("f:/download/Install.exe")+"字节");
/** 取得info2文g夹下的所有文件列?q下载到 E盘下 */
List list = ftp.getFileList(".");
for (int i=0;i<list.size();i++)
{
String filename = (String)list.get(i);
System.out.println(filename);
ftp.download(filename,"E:/"+filename);
}
} catch (Exception e) {
///
}finally
{
ftp.closeServer();
}
}
}
]]>
2
?对于get方式Q服务器端用Request.QueryString获取变量的|对于post方式Q服务器端用Request.Form获取提交的数据。两U方式的参数都可以用Request来获得?/font>
3
?span lang="EN-US">Get 方式传输的数据量非常,一般限制在 2 KB 左右Q但是执行效率却?span lang="EN-US"> Post Ҏ(gu)好;?span lang="EN-US"> Post 方式传递的数据量相对较大,它是{待服务器来d数据Q不q也有字节限Ӟq是Z(jin)避免Ҏ(gu)务器用大量数据进行恶意攻击,Ҏ(gu)微Y斚w的说法,微Y对用 Request.Form() 可接收的最大数据有限制Q?span lang="EN-US">IIS 4 中ؓ(f) 80 KB 字节Q?span lang="EN-US">IIS 5 中ؓ(f) 100 KB 字节
4?span lang="EN-US"> <form method="get" action="a.asp?b=b">?span lang="EN-US"><form method="get" action="a.asp">是一L(fng)Q也是_(d)action面后边带的参数列表?x)被忽视Q?span lang="EN-US"><form method="post" action="a.asp?b=b">?span lang="EN-US"><form method="post" action="a.asp">是不一L(fng)?/font>
Q除非你肯定你提交的数据可以一ơ性提交,否则请尽量用 Post Ҏ(gu)
5?span lang="EN-US">get安全性非怽Q?span lang="EN-US">post安全性较高?/font>
Get
方式提交数据Q会(x)带来安全问题Q比如一个登陆页面,通过 Get 方式提交数据Ӟ用户名和密码出现在 URL 上,如果面可以被缓存或者其他h可以讉K客户q台机器Q就可以从历史记录获得该用户的帐号和密码Q所以表单提交徏议?span lang="EN-US"> Post Ҏ(gu)Q?span lang="EN-US">Post Ҏ(gu)提交的表单页面常见的问题是,该页面如果刷新的时候,?x)弹Z个对话框
Q出于安全性考虑Q徏议最好?span lang="EN-US"> Post 提交数据
create table tbl_zidian
(
name varchar2(500),english varchar2(1000)
)
ORGANIZATION EXTERNAL
(
TYPE ORACLE_LOADER
DEFAULT DIRECTORY dir_test
ACCESS PARAMETERS
(
RECORDS DELIMITED BY NEWLINE
badfile 'x1.bad'
discardfile 's1.dis'
logfile 'x1.log'
fields terminated by ','
missing field values are null
)
LOCATION('20061222名词?txt')
);
create table tbl_zidian_3
(
name varchar2(100)
)
ORGANIZATION EXTERNAL
(
TYPE ORACLE_LOADER
DEFAULT DIRECTORY dir_test
ACCESS PARAMETERS
(
RECORDS DELIMITED BY NEWLINE
badfile 'x1.bad'
discardfile 's1.dis'
logfile 'x1.log'
fields terminated by ','
missing field values are null
)
LOCATION('参照.txt') --目录?br />);
create table tbl_tt2 as
select distinct ch_name,en_name,ch0_name from (
select b.name ch_name,a.english en_name,a.name ch0_name
from tbl_zidian a,tbl_zidian_3 b
where (a.name like '%'||b.name||'%') or (b.name like '%'||a.name||'%'));
select name,'','' from tbl_zidian_2
where name not in(select ch_name from tbl_tt) order by name