EL语法的应用之用户登录

系统管理员 2021-11-22 03:54 129阅读 0赞

**LoginServlet**

package com.demo2.controller;
    
    import java.io.IOException;
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @WebServlet("/LoginServlet")
    public class LoginServlet extends HttpServlet {
        
    	protected void doGet(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
        
    		// TODO Auto-generated method stub
    		String username = request.getParameter("username");
    		String password = request.getParameter("password");
    		request.getSession().setAttribute("name", username);
    
    		if ("tom".equals(username) && "123".equals(password)) {
        
    			response.sendRedirect("/demo2/success.jsp");
    		} else {
        
    			request.getSession().setAttribute("mag", "用户名或密码错误！");
    			response.sendRedirect("/demo2/login.jsp");
    		}
    	}
    
    	protected void doPost(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException {
        
    		doGet(request, response);
    	}
    
    }

**login.jsp**

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    ${mag}
    <form action="LoginServlet">
    <input type="text" name="username"/>
    <input type="password" name="password"/>
    <input type="submit">
    </form>
    </body>
    </html>

**success.jsp**