struts2、ajax实现前后端交互

时间：2021-12-02 08:32:16

跳过struts2环境搭建部分，或者可以看我的博客(http://www.cnblogs.com/zhangky/p/8436472.html)，里面有写，很详细。

需要导入的jar包（struts官网有，自己下）

struts2、ajax实现前后端交互

一、java类

    private String username;

    private String pwd;

    private Map<String, Object> result;

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    public String getPwd() {

        return pwd;

    }

    public void setPwd(String pwd) {

        this.pwd = pwd;

    }

    public Map<String, Object> getResult() {

        return result;

    }

    public void setResult(Map<String, Object> result) {

        this.result = result;

    }

    public String login() {

        result = new HashMap<String , Object>();

        if(username.equals("z") && pwd.equals("123")) {

            result.put("success", true);

            result.put("username", username);

            return "success";

        }else {

            result.put("success", false);

            return "success";

        }

    }

二、html页面

<html>

<head>

<meta charset="UTF-8">

<title>登录</title>

</head>

<body>

      <div id="tips"></div>

      <input type="text" id="username"/>

      <input type="password" id="pwd"/>

      <button onclick="login()">登录</button>

</body>

<script src="jquery.min.js"></script>

<script>

    function login(){

        const username = document.getElementById("username").value;

        const pwd = document.getElementById("pwd").value;

        $.ajax({

            type:"POST",

            url:"login",

            data:{

                "username":username,

                "pwd":pwd

            },

            dataType:"json",

            success:function(data){

                let tips = document.getElementById("tips");

                if(data.success == true){

                    window.location.href = "welcome.html?username=" +　data.username

                }else{

                    tips.innerHTML = "用户名或者密码错误";

                }

            },

            error:function(error){

            }

        })

    }

</script>

</html>

三、struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

   <package name="default" namespace="/" extends="json-default,struts-default">

       <action name="login" class="day20.LoginAction" method="login" >

            <!--result默认name是success可不写，由于返回的是json格式数据,因此type必须是json -->

            <result type="json">

            <!--param 的 name固定写，result就是java类要返回的数据变量  -->

               <param name="root">result</param>

            </result>

       </action>

   </package>

</struts>

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