Servlet简单实现登录功能

<%@ page cOntentType="text/html;charset=UTF-8" language="java" %>



 
 


 


 ${empty requestScope.Msg&＃63; "请输入用户名和密码":requestScope.Msg}


 用户名：

 密码：

 

 

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class LoginServlet extends HttpServlet {

 protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 //设置请求发来的字符集，避免乱码
 req.setCharacterEncoding("UTF-8");
 //获取用户名和密码
 String username=req.getParameter("username");
 String password=req.getParameter("password");
 //判断用户名密码是否正确（这里只做简单讲解）
  if(username.equals("张三")&&password.equals("123456")){
  //如果用户名密码正确，则请求转发到登录成功页面
  req.getRequestDispatcher("success.html").forward(req,resp);
  }else{
  //否则重定向到登录界面，并提示用户用户名或密码错误
  req.setAttribute("Msg","用户名或密码错误");
  req.getRequestDispatcher("index.jsp").forward(req,resp);
  }
 }
}

<&＃63;xml version="1.0" encoding="UTF-8"&＃63;>


 
 LoginServlet
 LoginServlet
 
 
 LoginServlet
 /loginServlet