一个完整的简单jsp+servlet实例，实现简单的登录

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开发环境myeclipse+tomcat8

1、先创建web project，项目名为RegisterSystem，

2、在WebRoot 目录下创建login.jsp文件：

[html] view plain copy
 
<%@ 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">  
    <!-- 
    <link rel="stylesheet" type="text/css" href="styles.css"> 
    -->  
  
  </head>  
    
  <body>  
    This is my JSP page. <br>  
     <form action="login">  
    username:<input type="text" name="username"><br>  
    password:<input type="password" name="pwd"><br>  
    <input type="submit">  
    </form>  
  </body>  
</html>  

3、在scr目录下的com.ht.servlet编写AccountBean.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

[html] view plain copy
 
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  
<%@page import="com.ht.servlet.AccountBean"%>      
<%  
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 'success.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>  
    
  <body>  
      
    <%  
    AccountBean account = (AccountBean)session.getAttribute("account");  
    %>  
    username:<%= account.getUsername()%>  
     <br>  
     password:<%= account.getPassword() %>  
       
     basePath: <%=basePath%>  
    path:<%=path%>  
  </body>  
</html>  

6、在WebRoot目录下编写fail.jsp文件失败后跳转

[html] view plain copy
 
<%@ 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 'fail.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>  
    
  <body>  
     Login Failed! <br>  
    basePath: <%=basePath%>  
    path:<%=path%>  
  </body>  
</html>  

7、修改web.xml配置文件

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<?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>  

输入测试路径：http://localhost:8080/RegisterSystem/login.jsp

注意：

.处理中文乱码问题

在Sertlet中加

response.setContentType("text/html;charset=utf-8")

在jsp页面中加

<%@ page language="java" import="java.util.*,java.NET.URLEncoder" pageEncoding="UTF-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

在servlet中

String username=request.getParameter("username");

username=new String(username.getBytes(“ISO-8859-1”),"UTF-8");

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

http://lelglin.iteye.com/blog/967503

http://zhidao.baidu.com/link?url=qg1AcsUjhkG4gHBv8GtHDjIQuwgtLto1_eyeinBx-b8TW9HAcYRR1zizL8vTDPTAjLwHPOdz7NcwJun-HyJXeK

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