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登录html

   
                    
    
                      
                           
     User Name                    
    
                    
    
                      
                           
     Password                    
    
    Login                    
                      
   

登录js

function login() {
       var username = document.getElementById("login-username").value //获取文本框的内容；    var password = document.getElementById("login-password").value    username = username.toString()    password = password.toString()	console.log(password)    $.ajax({
           type:"POST",        url:"Login",        data:{
               username:username,            password:password,        },        dataType:"json",        success:function(result){
               if ( result.state == 200)            {
                   self.location='index.html'            }            else alert(result.error)        },        error:function(result){
               alert('服务器连接错误')        }    })}

java serlvet

response.setContentType("text/html;charset=utf-8");		PrintWriter out = response.getWriter();		String uname =  request.getParameter("username");        String pwd = request.getParameter("password");        JSONObject jsonObject = new JSONObject();        if (uname.equals("admin")&&pwd.equals("admin")){
           	 //创建session对象            HttpSession session = request.getSession();            //把用户数据保存在session域对象中            session.setAttribute("uname", uname);        	jsonObject.put("state", "200");            System.out.println(jsonObject.toString());        	out.print(jsonObject.toString());        }        else{
           	System.out.println(uname);        	jsonObject.put("state", "404");            jsonObject.put("error", "请输入正确的账号和密码！");            System.out.println(jsonObject.toString());        	out.print(jsonObject.toString());        }

注销serlvet

response.setContentType("text/html;charset=utf-8");		PrintWriter out = response.getWriter();        JSONObject jsonObject = new JSONObject();        HttpSession session = request.getSession(false);//防止创建Session        session.invalidate();    	jsonObject.put("state", "200");        jsonObject.put("error", "注销成功！");        System.out.println(jsonObject.toString());    	out.print(jsonObject.toString());

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