一个简单的jsp+servlet实例，实现简单的登录

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开发环境myeclipse+tomcat6

1、先创建web project，项目名为 RegisterSystem。

2、在WebRoot 目录下创建login.jsp文件，只需修改body中的内容，如下所示：

<body>    <form action="login">    username:<input type="text" name="username"><br>    password:<input type="password" name="pwd"><br>    <input type="submit">    </form>  </body>

3、在scr目录下的com.ht.servlet编写AcountBean.java文件，代码如下：

package com.ht.servlet;public class AccountBean { private String username = ""; private String password = ""; public String getPassword() {  return password; } public void setPassword(String password) {  this.password = password; } public String getUsername() {  return username; } public void setUsername(String username) {  this.username = username; }}

4、在scr目录下的com.ht.servlet编写servlet类CheckAccount.java文件，代码如下：

package com.ht.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class CheckAccount extends HttpServlet { @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp)   throws ServletException, IOException {  doGet(req,resp); } @Override public void doGet(HttpServletRequest req, HttpServletResponse resp)   throws ServletException, IOException {  HttpSession session = req.getSession();  AccountBean account = new AccountBean();  String username = req.getParameter("username");  String pwd = req.getParameter("pwd");  account.setPassword(pwd);  account.setUsername(username);  if((username != null)&&(username.trim().equals("jsp"))) {   if((pwd != null)&&(pwd.trim().equals("1"))) {    System.out.println("success");    session.setAttribute("account", account);    String login_suc = "success.jsp";    resp.sendRedirect(login_suc);    return;   }  }  String login_fail = "fail.jsp";  resp.sendRedirect(login_fail);  return; } }

5、在WebRoot目录下编写success.jsp文件成功后跳转

<body>    <%    AccountBean account = (AccountBean)session.getAttribute("account");    %>    username:<%= account.getUsername()%>     <br>     password:<%= account.getPassword() %>  </body>

6、在WebRoot目录下编写fail.jsp文件失败后跳转

<body>   Login Failed! <br>  </body>

7、修改web.xml配置文件

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <welcome-file-list>    <welcome-file>login.jsp</welcome-file>  </welcome-file-list>   <servlet>       <description>This is the description of my J2EE component</description>       <display-name>This is the display name of my J2EE component</display-name>         <servlet-name>CheckAccount</servlet-name>       <servlet-class>com.ht.servlet.CheckAccount</servlet-class>     </servlet>     <servlet-mapping>       <servlet-name>CheckAccount</servlet-name>       <url-pattern>/login</url-pattern>     </servlet-mapping> </web-app>

http://blog.sina.com.cn/s/blog_5c5bc9070100z7wb.html

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