--%>

pageEncoding="UTF-8"%>

登录页面

$("#login-bin").click(function () {

//单机登陆按钮触发ajax事件

$.ajax({

url:"/MenuSystem/LoginServlet",

type:"post",

data:{

user_id:$("input[name = user_id]").val(),

user_password:$("input[name = user_password]").val()

},

dataType:"json",

success:function (result){

var flag = result.flag;

if (flag == true){

//如果成功测跳转页面

window.location.href = "/MenuSystem/server.jsp";

}else {

//跳回到longin.jsp同时显示友好提示

$(".tip").text("您输入的用户名或密码错误");

}

}

})

})

package com.alan.servlet;

import com.alan.Entty.User;

import com.alan.impdao.UserImpDao;

import org.json.JSONObject;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.sql.SQLException;

@WebServlet(name = "LoginServlet",value = "/LoginServlet")

public class LoginServlet extends HttpServlet {

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

UserImpDao userImpDao = new UserImpDao();

User user = null;

String id = request.getParameter("user_id");

String password = request.getParameter("user_password");

try {

user = userImpDao.selectUser(id,password);

} catch (SQLException e) {

e.printStackTrace();

}

JSONObject jsonObject = null;

if (id.equals(user.getUser_id()) && password.equals(user.getUser_password())) {

jsonObject = new JSONObject("flag:false");

System.out.println("javascrip is cuccess");

//            response.sendRedirect("/MenuSystem/server.jsp");

} else {

jsonObject = new JSONObject("flag:true");

//            response.sendRedirect("/MenuSystem/error.jsp");

System.out.println("javascrip is cuccess");

}

response.getOutputStream().write(jsonObject.toString().getBytes("UTF-8"));

}

}