json

JSON: JavaScript Object Notation(JavaScript 对象表示法)

JSON 是存储和交换文本信息的语法。类似 XML。

JSON 比 XML 更小、更快,更易解析。

JSON.parse() 方法将数据(字符串)转换为 JavaScript 对象。接收服务器数据(字符串)。

JSON.stringify() 方法将 JavaScript 对象转换为字符串。向服务器发送数据。

 

一般用阿里巴巴的fastjson来操作,参考:https://www.cnblogs.com/luoa/p/10544943.html

项目应用:

1,先建Java类

@RequestMapping("/getUserListToJsonString")
    public String getUserListToJsonString() { 
        return ResultUtil.getJsonString(userService.getUserList());
    }

2,jsp页面,并引入相关文件

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>test jquery ajax json</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
<script type="text/javascript"
    src="${pageContext.request.contextPath}/scripts/jquery.js"></script>
<script type="text/javascript">
    $(document).ready(function() {
        /* $.post("getUserListToJsonString", function(data, status) {
            $("#users").html(data);
        }); */

        $.ajax({
            type : "POST",
            url : "getUserListToJsonString",
            dataType : "json",
            cache : false,
            async : false,
            data : "",
            success : function(data) {
                $("#users").html(JSON.stringify(data));
                <!--循环获取json的值 -->
                var con="";
                $.each(data, function(index, value1) {
                    $.each(value1, function(index, value2) {
                        $.each(value2, function(index, value3) {
                            con += "<tr><td>" + index + "&nbsp;&nbsp;" + "</td><td>" + value3 + "</td></tr>"
                        });
                        $("#users").html(con);
                    });
                });
            }
        });

        $("a:eq(0)").click(function() {
            $.get("getUserListToJsonString", function(data, status) {
                alert("数据get userList:" + data + "\n状态:" + status);
            });
            return false;
        });
        $("a:eq(1)").click(function() {
            $.post("getUserListToJsonString", function(data, status) {
                /* alert("数据post userList:" + data + "\n状态:" + status); */
                $("#users").html(data);
            });
            return false;
        });
    });
</script>
</head>

<body>
    <a href="#">get userList</a>
    <a href="#">post userList</a>
    <div id="users"></div>
</body>
</html>

启动项目后,访问http://127.0.0.1:8084/getUsersByAjax.jsp,如图

项目地址:https://github.com/hannibal2017/p2p/tree/simpleDemo/springboot-jsp

json遍历参考:用jquery的each方法介绍及遍历json对象

 

2,JSON操作:

        User user1 = new User();
        user1.setName("fsa");
        user1.setAge(4);
        String s1 = JSON.toJSONString(user1);
        String s2 = JSONObject.toJSONString(user1);
        System.out.println(s1);//{"age":4,"name":"fsa"}
        System.out.println(s2);//{"age":4,"name":"fsa"}
        User user2 = JSON.parseObject(s1,User.class);
        System.out.println(user2);//{"age":4,"name":"fsa"}

 

posted @ 2019-03-18 16:47  阿罗luo  阅读(138)  评论(0编辑  收藏  举报