Servlet登录验证

Servlet用户名及密码验证

实验结果

代码

FakeLogin.java

package com.fakelogin.servlet;

import java.io.IOException;


import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class FakeLogin extends HttpServlet {

	@Override
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String userName = request.getParameter("userid");
		String userPwd = request.getParameter("passwd");
		
		System.out.println("userName"+userName);
		System.out.println("userPwd"+userPwd);
		
		String info = "";
		if(("tom".equals(userName))&&"123".equals(userPwd))
		//if(userName == "tom" && userPwd == "123")
		{
			info = "用户"+userName+"的密码是"+userPwd;
		}else{
			info = "用户名或密码不正确！";
		}
		request.setAttribute("outputMessage", info);
		request.getRequestDispatcher("./"+"NewFile.jsp").forward(request,response);
			
	}
	
	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request,response);
	}
	
}

　　web.xml

<?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>
    <servlet-name>FakeLogin</servlet-name>
    <servlet-class>com.fakelogin.servlet.FakeLogin</servlet-class>
  </servlet>
 
  <servlet-mapping>
    <servlet-name>FakeLogin</servlet-name>
    <url-pattern>/FakeLogin</url-pattern>
  </servlet-mapping>
</web-app>

<%@ page language="java" contentType="text/html; charset=gb2312"
    %>
<!DOCTYPE html>
<html>
<head>

  <link rel="stylesheet" href="css/style.css">

  <title>FAKE NEWS</title>
</head>
<body>
  <div class="logform">
  <label class="title"for="AAAA">帐号登录</label>

    <form class="loginform" id="aaa" action="FakeLogin" method="post">
      <input class="inputbox" type="text" id="userid" name="userid" placeholder="用户名">
      <input class="inputbox" type="password" id="passwd" name="passwd" placeholder="密码">
      <input class="submit" type="submit" name="submit" value="登陆">
    </form>
  </div>
</body>
</html>

　　NewFile.jsp

<%@ page language="java" contentType="text/html; charset=gb2312"
    %>
<!DOCTYPE html>
<html>
<head>



</head>
<body>
	<%=request.getAttribute("outputMessage") %>
	<p> end </p>
</body>
</html>

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