開發(fā)用的工具M(jìn)yeclipse6.0,JDK1.5,TOMCAT5.5,SQLSERVLET2000;用的是最基礎(chǔ)的j2ee:jsp+javabean+servlet
1,現(xiàn)在在系統(tǒng)完成后的包類：
2，com.he.db里的DB.java，作用是連接數(shù)據(jù)庫和創(chuàng)建stament和resultset和關(guān)閉他們。以及增刪查該的執(zhí)行
1 package com.he.db;
2
3 import java.sql.Connection;
4 import java.sql.DriverManager;
5 import java.sql.PreparedStatement;
6 import java.sql.ResultSet;
7 import java.sql.SQLException;
8 import java.sql.Statement;
9
10 public class DB {
11
12 private static DB db = null;
13 private static Connection conn = null;
14 private static Statement stmt = null;
15
16 //單例模式,new DB類的時(shí)候,創(chuàng)建唯一對(duì)象,只初始化一次,
17 //注意:不要顯式交閉此static中的Connection和Statement對(duì)象,否則拋空指針異常
18 static{
19 try {
20 String driverClass = "net.sourceforge.jtds.jdbc.Driver";
21 String url = "jdbc:jtds:sqlserver://localhost:1433;DatabaseName=login";
22 String username = "sa"; //edit
23 String password = ""; //edit
24 Class.forName(driverClass);
25 conn = DriverManager.getConnection(url,username,password);
26 stmt = conn.createStatement();
27 System.out.println("--------初始化---------");
28 } catch (ClassNotFoundException e) {
29 System.out.println("---------- 加載數(shù)據(jù)庫驅(qū)動(dòng)類時(shí)發(fā)生異常: ----------");
30 e.printStackTrace();
31 } catch (SQLException e) {
32 System.out.println("------------ getConnection()方法發(fā)生異常--------------");
33 }
34 }
35
36 //創(chuàng)建PrepareStatement對(duì)象
37 public PreparedStatement prepareStmt(String sql){
38 PreparedStatement pstmt = null;
39 try {
40 pstmt = conn.prepareStatement(sql);
41 } catch (SQLException e) {
42 System.out.println("-------------prepareStmt()方法發(fā)生異常-------------------");
43 e.printStackTrace();
44 }
45 return pstmt;
46 }
47
48 //執(zhí)行查詢所有記錄操作
49 public ResultSet exeQuery(String sql){
50 ResultSet rs = null;
51 try {
52 rs = stmt.executeQuery(sql);
53 } catch (SQLException e) {
54 System.out.println("------------exeQuery()方法發(fā)生異常: --------------------");
55 e.printStackTrace();
56 }
57 return rs;
58 }
59
60 //執(zhí)行保存、更新、刪除操作
61 public void exeUpdate(String sql){
62 try{
63 stmt.executeUpdate(sql);
64 } catch(SQLException e){
65 System.out.println("------------- exeUpdate()方法發(fā)生異常------------------");
66 e.printStackTrace();
67 }
68 }
69
70
71 //關(guān)閉PreparedStatement對(duì)象
72 public void closePstmt(PreparedStatement pstmt){
73 try{
74 pstmt.close();
75 pstmt = null;
76 }catch(SQLException e){
77 System.out.println("-------------------- DB.closePstmt()方法發(fā)生異常 -------------------------");
78 e.printStackTrace();
79 }
80 }
81
82 //關(guān)閉ResultSet對(duì)象
83 public void closeRs(ResultSet rs){
84 try{
85 rs.close();
86 rs = null;
87 }catch(SQLException e){
88 System.out.println("-------------------- DB.closePstmt()方法發(fā)生異常 -------------------------");
89 e.printStackTrace();
90 }
91 }
92
93
94 }
95
3，com.he.manager里的Manager.java，作用是實(shí)現(xiàn)登錄系統(tǒng)所需要用到的各項(xiàng)功能。例如添加帳號(hào)，查看是否數(shù)據(jù)庫里有同名帳號(hào)等。。
1 package com.he.manager;
2
3 import java.sql.PreparedStatement;
4 import java.sql.ResultSet;
5 import java.sql.SQLException;
6 import java.util.ArrayList;
7 import java.util.Iterator;
8 import java.util.List;
9 import java.util.regex.Pattern;
10
11 import com.he.db.DB;
12 import com.he.pojo.Account;
13 import com.sun.org.apache.xerces.internal.impl.xs.identity.Selector.Matcher;
14
15 public class Manager {
16
17 DB db = new DB();
18
19 // 添加帳號(hào)
20 public void addAccount(Account account) {
21 PreparedStatement pstmt = null;
22 String sql = "insert into account(name,pwd,addtime) values(?,?,?)";
23 pstmt = db.prepareStmt(sql);
24 try {
25 pstmt.setString(1, account.getName());
26 pstmt.setString(2, account.getPwd());
27 pstmt.setString(3, account.getAddtime());
28 pstmt.executeUpdate();
29
30 } catch (SQLException e) {
31 System.out
32 .println("-----------------Manager.addAccount()方法異常-------------------------");
33 e.printStackTrace();
34 } finally {
35 db.closePstmt(pstmt);
36 }
37 }
38
39 // 查看數(shù)據(jù)庫里是否有指定name的相同記錄；
40 public static boolean HasAccount(String name) {
41 DB db = new DB();
42 ResultSet rs = null;
43 int count = 0;
44 String sql = "select count(*) from account where name = '" + name + "'";
45 rs = db.exeQuery(sql);
46 try {
47 while (rs.next()) {
48 count = rs.getInt(1);
49 }
50 } catch (SQLException e) {
51 System.out
52 .println("------------Manager.HasAccount()方法異常------------------------");
53 e.printStackTrace();
54 } finally {
55 db.closeRs(rs);
56 }
57 if (count > 0) {
58 return true;
59 } else
60 return false;
61 }
62
63 // 判斷提交的帳號(hào)密碼是否有相應(yīng)的記錄在數(shù)據(jù)庫中；
64 public static boolean CheckAccount(String name, String pwd) {
65 DB db = new DB();
66 ResultSet rs = null;
67 int count = 0;
68 String sql = "select count(*) from account where name = '" + name
69 + "' and pwd = '" + pwd + "' ";
70 rs = db.exeQuery(sql);
71 try {
72 while (rs.next()) {
73 count = rs.getInt(1);
74 }
75 } catch (SQLException e) {
76 System.out
77 .println("-----------Manager.CheckAccount()方法異常--------------");
78 } finally {
79 db.closeRs(rs);
80 }
81 if (count > 0) { // 如果結(jié)果大于0；
82 return true; // 表示此用戶存在；
83 } else
84 return false; // 表示此用戶不存在；
85 }
86
87 // 判斷提交的帳號(hào)密碼是否符合要求；
88 public static boolean CheckForm(String name, String pwd) {
89 String regEx="[a-zA-Z0-9]{4,8}+";//正則表達(dá)示:四到八位的數(shù)字或字母
90 if(name.matches(regEx)&&pwd.matches(regEx)) return true;
91 else return false;
92 }
93
94 }
95
4，com.he.pojo里的Account.java，作用是臨時(shí)存放并傳遞帳號(hào)的各項(xiàng)屬性。
1 package com.he.pojo;
2
3 public class Account {
4 private int id;
5 private String name;
6 private String pwd;
7 private String addtime;
8
9 public int getId() {
10 return id;
11 }
12 public void setId(int id) {
13 this.id = id;
14 }
15
16 public String getName() {
17 return name;
18 }
19 public void setName(String name) {
20 this.name = name;
21 }
22
23 public String getPwd() {
24 return pwd;
25 }
26 public void setPwd(String pwd) {
27 this.pwd = pwd;
28 }
29
30 public String getAddtime() {
31 return addtime;
32 }
33 public void setAddtime(String addtime) {
34 this.addtime = addtime;
35 }
36
37 }
38
5.com.he.bean里的makeCertpic.java，作用是生成驗(yàn)證碼的圖片。
1 package com.he.bean;
2
3 import java.awt.Color;
4 import java.awt.Font;
5 import java.awt.Graphics;
6 import java.awt.image.BufferedImage;
7 import java.io.IOException;
8 import java.io.OutputStream;
9 import java.util.Random;
10 import javax.imageio.ImageIO;
11
12 /**
13 * @author dzy 生成驗(yàn)證碼圖片
14 */
15 public class makeCertPic {
16 // 驗(yàn)證碼圖片中可以出現(xiàn)的字符集,可根據(jù)需要修改
17 private char mapTable[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
18 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
19 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8',
20 '9' };
21
22 /**
23 * 功能:生成彩色驗(yàn)證碼圖片 參數(shù)width為生成的圖片的寬度,參數(shù)height為生成的圖片的高度,參數(shù)os為頁面的輸出流
24 */
25 public String getCertPic(int width, int height, OutputStream os) {
26 if (width <= 0)
27 width = 60;
28 if (height <= 0)
29 height = 20;
30 BufferedImage image = new BufferedImage(width, height,
31 BufferedImage.TYPE_INT_RGB);
32 // 獲取圖形上下文
33 Graphics g = image.getGraphics();
34 // 設(shè)定背景色
35 g.setColor(new Color(0xDCDCDC));
36 g.fillRect(0, 0, width, height);
37 // 畫邊框
38 g.setColor(Color.black);
39 g.drawRect(0, 0, width - 1, height - 1);
40 // 取隨機(jī)產(chǎn)生的認(rèn)證碼
41 String strEnsure = "";
42 // 4代表4位驗(yàn)證碼,如果要生成更多位的認(rèn)證碼,則加大數(shù)值
43 for (int i = 0; i < 4; ++i) {
44 strEnsure += mapTable[(int) (mapTable.length * Math.random())];
45 }
46 // 將認(rèn)證碼顯示到圖象中,如果要生成更多位的認(rèn)證碼,增加drawString語句
47 g.setColor(Color.black);
48 g.setFont(new Font("Atlantic Inline", Font.PLAIN, 18));
49 String str = strEnsure.substring(0, 1);
50 g.drawString(str, 8, 17);
51 str = strEnsure.substring(1, 2);
52 g.drawString(str, 20, 15);
53 str = strEnsure.substring(2, 3);
54 g.drawString(str, 35, 18);
55 str = strEnsure.substring(3, 4);
56 g.drawString(str, 45, 15);
57 // 隨機(jī)產(chǎn)生10個(gè)干擾點(diǎn)
58 Random rand = new Random();
59 for (int i = 0; i < 10; i++) {
60 int x = rand.nextInt(width);
61 int y = rand.nextInt(height);
62 g.drawOval(x, y, 1, 1);
63 }
64 // 釋放圖形上下文
65 g.dispose();
66 try {
67 // 輸出圖象到頁面
68 ImageIO.write(image, "JPEG", os);
69 } catch (IOException e) {
70 return "";
71 }
72 return strEnsure;
73 }
74 }
75
6。com.he.servlet里的LoginServlet.java，作用是驗(yàn)證登錄。
1 package com.he.servlet;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5 import java.security.MessageDigest;
6
7 import javax.servlet.ServletException;
8 import javax.servlet.http.HttpServlet;
9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11 import javax.servlet.http.HttpSession;
12
13 import com.he.manager.Manager;
14
15 public class LoginServlet extends HttpServlet {
16 public void doGet(HttpServletRequest request, HttpServletResponse response)
17 throws ServletException, IOException {
18 PrintWriter out = response.getWriter();
19 String name = (String) request.getParameter("name");
20 name = name.trim(); //去掉字符串首尾空格
21 String pwd = (String) request.getParameter("pwd");
22 pwd = pwd.trim();
23 boolean Check = Manager.CheckForm(name, pwd); //驗(yàn)證輸入的帳號(hào)密碼是否符合規(guī)則
24 System.out.println(Check);
25 if (Check) {
26 // 將密碼轉(zhuǎn)為MD5加密
27 try {
28 // -------生成MessageDigest對(duì)象MD-------
29 MessageDigest MD = MessageDigest.getInstance("MD5");
30 // --------傳入要計(jì)算的字符---------------
31 MD.update(pwd.getBytes("UTF8"));
32 // --------計(jì)算信息摘要----------------
33 byte[] pwdMD5Byte = MD.digest();
34 pwd = new String(pwdMD5Byte);
35 } catch (Exception e) {
36 e.printStackTrace();
37 }
38 String certCode = request.getParameter("certCode");
39 //查看輸入的帳號(hào)密碼是否在數(shù)據(jù)庫里有記錄
40 boolean tag = Manager.CheckAccount(name, pwd);
41 // 執(zhí)行輸出操作(彈出成功的對(duì)話框)
42 response.setCharacterEncoding("gbk"); // 解決中文顯示問題
43 HttpSession session = request.getSession();
44 if (certCode.equals((String) session.getAttribute("certCode"))) {
45 if (tag) {
46 session.setAttribute("name", name); //驗(yàn)證成功的話設(shè)置session
47 out
48 .print("<script language=javascript>alert('Login Succeed!!');window.location.href='SucceedLogin.jsp';</script>");
49 } else {
50 out
51 .print("<script language=javascript>alert('account or password error!!');window.location.href='index.jsp';</script>");
52 }
53 } else {
54 out
55 .print("<script language=javascript>alert('certCode error!!');window.location.href='index.jsp';</script>");
56 }
57 } else {
58 out
59 .print("<script language=javascript>alert('rule error!!');window.location.href='index.jsp';</script>");
60 }
61 }
62
63 public void doPost(HttpServletRequest request, HttpServletResponse response)
64 throws ServletException, IOException {
65 doGet(request, response);
66 }
67
68 }
7。com.he.servlet里的Registe.java作用是進(jìn)行注冊操作。
1 package com.he.servlet;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5 import java.util.Date;
6 import java.security.MessageDigest;
7 import java.text.SimpleDateFormat;
8
9 import javax.servlet.ServletException;
10 import javax.servlet.http.HttpServlet;
11 import javax.servlet.http.HttpServletRequest;
12 import javax.servlet.http.HttpServletResponse;
13 import javax.servlet.http.HttpSession;
14
15 import com.he.manager.Manager;
16 import com.he.pojo.Account;
17
18 public class RegisteServlet extends HttpServlet {
19 public void doGet(HttpServletRequest request, HttpServletResponse response)
20 throws ServletException, IOException {
21 Date currTime = new Date(); // 添加帳號(hào)的時(shí)間
22 SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
23 String time = new String(formatter.format(currTime).getBytes(
24 "iso-8859-1")); // 時(shí)間格式化
25 String name = (String) request.getParameter("name");
26 name = name.trim(); // 去除字符串首尾空格
27 String pwd = (String) request.getParameter("pwd");
28 pwd = pwd.trim();
29 boolean Check = Manager.CheckForm(name, pwd); // 驗(yàn)證輸入的帳號(hào)密碼是否符合規(guī)則
30 System.out.println(Check);
31 if (Check) {
32 // 在寫入數(shù)據(jù)庫之前將密碼轉(zhuǎn)為MD5加密
33 try {
34 // -------生成MessageDigest對(duì)象MD-------
35 MessageDigest MD = MessageDigest.getInstance("MD5");
36 // --------傳入要計(jì)算的字符---------------
37 MD.update(pwd.getBytes("UTF8"));
38 // --------計(jì)算信息摘要----------------
39 byte[] pwdMD5Byte = MD.digest();
40 pwd = new String(pwdMD5Byte);
41 } catch (Exception e) {
42 e.printStackTrace();
43 }
44 boolean tag = Manager.HasAccount(name); // 查看數(shù)據(jù)庫里有沒相同的用戶名記錄
45 if (tag) {
46 response.setCharacterEncoding("gbk"); // 解決中文顯示問題
47 PrintWriter out = response.getWriter();
48 out
49 .print("<script language=javascript>alert('用戶名已被占用');window.location.href='registe.jsp';</script>");
50 } else {
51 // new 一個(gè)Account對(duì)象,并將表單傳過來的值填充它
52 Account account = new Account();
53 account.setName(request.getParameter("name"));
54 account.setPwd(pwd);
55 account.setAddtime(time);
56 // 執(zhí)行持久化操作,保存到數(shù)據(jù)庫
57 Manager manager = new Manager();
58 manager.addAccount(account);
59 // 執(zhí)行輸出操作(彈出成功的對(duì)話框)
60 response.setCharacterEncoding("gbk"); // 解決中文顯示問題
61 HttpSession session = request.getSession();
62 session.setAttribute("name", request.getParameter("name"));
63 PrintWriter out = response.getWriter();
64 out
65 .print("<script language=javascript>alert('注冊成功!');window.location.href='SucceedLogin.jsp';</script>");
66 }
67 } else {
68 response.setCharacterEncoding("gbk"); // 解決中文顯示問題
69 PrintWriter out = response.getWriter();
70 out
71 .print("<script language=javascript>alert('帳號(hào)或密碼必須是四到八位的數(shù)字或字母!!');window.location.href='registe.jsp';</script>");
72 }
73 }
74
75 public void doPost(HttpServletRequest request, HttpServletResponse response)
76 throws ServletException, IOException {
77 doGet(request, response);
78 }
79
80 }
81
8。index.jsp，登錄界面。
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<script language="JavaScript">
function check()
{
if( form.name.value=="" )
{
alert("\請輸入您的用戶名！！")
form.name.focus();
return false;
}
if( form.pwd.value=="" )
{
alert("\請輸入您的登陸密碼!!")
form.pwd.focus();
return false;
}
return true;
}
</script>
<body>
<h1>用戶登錄</h1>
<form name="form" id="form" onSubmit="return check()" method="post" action="LoginServlet">
<p>帳 號(hào):<input type="text" name="name" /></p>
<p>密 碼:<input type="password" name="pwd" /></p>
<P>驗(yàn)證碼:<input type="text" name="certCode" /><img src="makeCertPic.jsp" /></P>
<p><input type="submit" name="submit" value="登錄">
<input type="button" onClick="location='registe.jsp'" value="注冊" class="btn"/>
</p>
</form>
</body>
</html>
9。registe.jsp，注冊界面
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>注冊</title>
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<script language="JavaScript">
function check()
{
if( form.name.value=="" )
{
alert("\請輸入您的用戶名！！")
form.name.focus();
return false;
}
if( form.pwd.value=="" )
{
alert("\請輸入您的登陸密碼!!")
form.pwd.focus();
return false;
}
if(form.repwd.value=="")
{
alert("\請輸入您的第二次密碼！！")
form.repwd.focus();
return false;
}
if(form.pwd.value!=form.repwd.value)
{
alert("\兩次輸入的密碼不一致!!")
form.repwd.focus();
return false;
}
return true;
}
</script>
<body>
<h1>注冊</h1>
<form name="form" id="form" onSubmit="return check()" method="post" action="RegisteServlet">
<p>帳號(hào):<input name="name" type="text" /></p>
<P>密碼:<input name="pwd" type="password" /></P>
<p>再次輸入密碼:<input name="repwd" type="password"></p>
<p><input type="submit" value="注冊" /> <input type="reset" value="重置" /></p>
</form>
</body>
</html>
10。makeCertpic.jsp 驗(yàn)證碼圖片的
<%@page contentType="image/jpeg" pageEncoding="gbk" %>
<jsp:useBean id="image" scope="page" class="com.he.bean.makeCertPic" />
<%
String str = image.getCertPic(0,0,response.getOutputStream());
// 避免getWriter()和responsegetOutputStream()沖突而產(chǎn)生異常
out.clear();
out = pageContext.pushBody();
// CREATE SESSION
session.setAttribute("certCode", str);
%>
11.SucceedLogin.jsp 登錄成功的頁面
1 <%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
2 <%@ include file="CheckLogin.jsp" %>
3 <%
4 String path = request.getContextPath();
5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
6 %>
7
8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
9 <html>
10 <head>
11 <base href="<%=basePath%>">
12
13 <title>SucceedLogin</title>
14
15 <meta http-equiv="pragma" content="no-cache">
16 <meta http-equiv="cache-control" content="no-cache">
17 <meta http-equiv="expires" content="0">
18 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
19 <meta http-equiv="description" content="This is my page">
20 <!--
21 <link rel="stylesheet" type="text/css" href="styles.css">
22 -->
23
24 </head>
25
26 <body>
27 <h1>歡迎您</h1>
28 ${sessionScope.name}
29 </body>
30 </html>
31
12。CheckLogin.jsp 進(jìn)行未登錄就進(jìn)入登錄成功的界面的驗(yàn)證
1
2 <%
3 if (session.getAttribute("name") == null
4 || session.getAttribute("name").toString().length() == 0) {
5 response.sendRedirect(request.getContextPath() + "/error.jsp");
6 }
7 %>
13.web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>RegisteServlet</servlet-name>
<servlet-class>com.he.servlet.RegisteServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.he.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RegisteServlet</servlet-name>
<url-pattern>/RegisteServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/LoginServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
14.到此，我的注冊登錄系統(tǒng)基本完成了。新人作品，希望大家批評(píng)指正。
此文為原創(chuàng)，如有轉(zhuǎn)載請注明出處http://www.aygfsteel.com/gdhqs/。如有錯(cuò)誤，請大家批評(píng)指正，謝謝！