实现登录与注销界面：程序如下：
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| 文件: |
demo1.rar |
| 大小: |
666KB |
| 下载: |
下载 | |
1.index.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%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 'login.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">
</head>
<body>
<form name="form1" action="UserServlet.do?method=login" method="post">
<table width="200" border="1">
<tr>
<td colspan="2">登录窗口</td>
<tr>
<td>用户名</td>
<td><input type="text" name="username" size="10"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password" size="10"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="登录"> <a
href="register.jsp">注册新用户</a></td>
</tr>
</table>
</form>
</body>
</html>
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2.register.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%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 'register.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">
</head>
<body>
<form name="form1" action="UserServlet.do?method=register" method="post">
<table width="200" border="1">
<tr>
<td colspan="2">注册窗口</td>
<tr>
<td>用户名</td>
<td><input type="text" name="username" size="10"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password1" size="10"></td>
</tr>
<tr>
<td>确认密码</td>
<td><input type="password" name="password2" size="10"></td>
</tr>
<tr>
<td>Email</td>
<td><input type="text" name="email" size="10"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="登录"> <a
href="login.jsp">返回</a></td>
</tr>
</table>
</form>
</body>
</html>
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3.welcome.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%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 'welcome.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">
</head>
<body>
<table width="100%">
<tr>
<td><img src="images/logo4.png"></td>
<td><img src="images/logo2.png" height="90"></td>
</tr>
<tr>
<td colspan="2">
<hr>
</td>
</tr>
<tr>
<td>
<table>
<tr>
<td><a href="welcome.jsp">Main</a></td>
</tr>
<tr>
<td><a href="menu1.jsp">Menu1</a></td>
</tr>
<tr>
<td><a href="menu2.jsp">Menu2</a></td>
</tr>
<tr>
<td><a href="menu3.jsp">Menu3</a></td>
</tr>
<tr>
<td><a href="menu4.jsp">Menu4</a></td>
</tr>
<tr>
<td><a href="menu5.jsp">Menu5</a></td>
</tr>
<tr>
<td><a href="menu6.jsp">Menu6</a></td>
</tr>
<tr>
<td><a href="menu7.jsp">Menu7</a></td>
</tr>
<tr>
<td><a href="menu8.jsp">Menu8</a></td>
</tr>
</table>
</td>
<td>
<form name="form1" action="UserServlet.do?method=logout" method="post">
<table width="200" border="1">
<tr>
<td colspan="2">登录成功</td>
<tr>
<td>欢迎你，</td>
<td><%=(String) session.getAttribute("username")%></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="退出"></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
</body>
</html>
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4. com.demo.servlet:UserServlet
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package com.demo.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.demo.javabean.UserBean;
public class UserServlet extends HttpServlet {
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String method = (String)request.getParameter("method");
if(method==null) {
PrintWriter out = response.getWriter();
out.println("invalid request!");
} else if(method.equals("login")) {
Login(request, response);
} else if(method.equals("logout")) {
Logout(request, response);
} else if(method.equals("register")) {
Register(request, response);
}
}
protected void Login(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// get parameters
String username = request.getParameter("username");
String password = request.getParameter("password");
// check null
if (username == null || password == null) {
response.sendRedirect("index.jsp");
return;
}
// validate
UserBean userBean = new UserBean();
boolean isValid = userBean.valid(username, password);
if (isValid) {
HttpSession session = request.getSession();
session.setAttribute("username", username);
response.sendRedirect("welcome.jsp");
return;
} else {
response.sendRedirect("index.jsp");
return;
}
}
protected void Logout(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
session.removeAttribute("username");
response.sendRedirect("index.jsp");
}
protected void Register(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// get parameters
String username = request.getParameter("username");
String password1 = request.getParameter("password1");
String password2 = request.getParameter("password2");
String email = request.getParameter("email");
// check null
if (username == null || password1 == null || password2 == null || !password1.equals(password2)) {
response.sendRedirect("register.jsp");
return;
}
// validate
UserBean userBean = new UserBean();
boolean isExist = userBean.isExist(username);
if(!isExist) {
userBean.add(username, password1, email);
response.sendRedirect("index.jsp");
return;
} else {
response.sendRedirect("register.jsp");
return;
}
}
}
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5. com.demo.javabean:DBAccess.java
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package com.demo.javabean;
public class UserBean {
public boolean valid(String username, String password) {
boolean isValid = false;
DBAccess db = new DBAccess();
if(db.createConn()) {
String sql = "select * from user where username='"+username+"' and password='"+password+"'";
db.query(sql);
if(db.next()) {
isValid = true;
}
db.closeRs();
db.closeStm();
db.closeConn();
}
return isValid;
}
public boolean isExist(String username) {
boolean isExist = false;
DBAccess db = new DBAccess();
if(db.createConn()) {
String sql = "select * from user where username='"+username+"'";
db.query(sql);
if(db.next()) {
isExist = true;
}
db.closeRs();
db.closeStm();
db.closeConn();
}
return isExist;
}
public void add(String username, String password, String email) {
DBAccess db = new DBAccess();
if(db.createConn()) {
String sql = "insert into user(username,password,email) values('"+username+"','"+password+"','"+email+"')";
db.update(sql);
db.closeStm();
db.closeConn();
}
}
}
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6. com.demo.javabean:UserBean.java
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package com.demo.javabean;
public class UserBean {
public boolean valid(String username, String password) {
boolean isValid = false;
DBAccess db = new DBAccess();
if(db.createConn()) {
String sql = "select * from user where username='"+username+"' and password='"+password+"'";
db.query(sql);
if(db.next()) {
isValid = true;
}
db.closeRs();
db.closeStm();
db.closeConn();
}
return isValid;
}
public boolean isExist(String username) {
boolean isExist = false;
DBAccess db = new DBAccess();
if(db.createConn()) {
String sql = "select * from user where username='"+username+"'";
db.query(sql);
if(db.next()) {
isExist = true;
}
db.closeRs();
db.closeStm();
db.closeConn();
}
return isExist;
}
public void add(String username, String password, String email) {
DBAccess db = new DBAccess();
if(db.createConn()) {
String sql = "insert into user(username,password,email) values('"+username+"','"+password+"','"+email+"')";
db.update(sql);
db.closeStm();
db.closeConn();
}
}
}
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