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软件架构技术(Java)之JSON数据交互

软件架构技术(Java)之JSON数据交互
一、JSON概述

JSON(JavaScript Object Notation,JS对象标记)是一种轻量级的数据交换格式。它是基于JavaScript的一个子集,使用了C、C++、C#、Java、JavaScript、Perl、Python等其他语言的约定,采用完全独立于编程语言的文本格式来存储和表示数据。 

JSON是基于纯文本的数据格式,用来存储数据,解析速度快,占用空间小,易于阅读和编写。

二、JSON数据格式
(一)对象结构

以“{”开始,以“}”结束。中间部分由0个或多个以英文“,”分隔的name:value对构成(注意name和value之间以英文“:”分隔),其存储形式如下图所示。

例如:一个address对象包含城市、街道、邮编等信息,使用JSON的表示形式如下:

  {"city":"Beijing","street":"Xisanqi","postcode":100096}

(二)数组结构

以“[”开始,以“]”结束。中间部分由0个或多个以英文“,”分隔的值的列表组成,其存储形式如下图所示。

例如,一个数组包含了String、Number、Boolean、null类型数据,使用JSON的表示形式如下:

    ["abc",12345,false,null]

对象、数组数据结构也可以分别组合构成更为复杂的数据结构。例如:一个person对象包含name、hobby和address对象,其代码表现形式如下:

{   "name": "zhangsan"   "hobby":["篮球","羽毛球","游泳"]   "address":{     "city":"Beijing"     "street":"Xisanqi"     "postcode":100096    }}

三、JSON数据转换

(一)简介

Spring提供了一个HttpMessageConverter<T>接口来实现浏览器与控制器类(Controller)之间的数据交互。该接口主要用于将请求信息中的数据转换为一个类型为T的对象,并将类型为T的对象绑定到请求方法的参数中,或者将对象转换为响应信息传递给浏览器显示。

HttpMessageConverter<T>接口有很多实现类,这些实现类可以对不同类型的数据进行信息转换。其中MappingJackson2HttpMessageConverter是Spring MVC默认处理JSON格式请求响应的实现类。该实现类利用Jackson开源包读写JSON数据,将Java对象转换为JSON对象和XML文档,同时也可以将JSON对象和XML文档转换为Java对象。

(二)使用注解实现JSON数据转换

使用注解实现JSON数据转换时,需要用到2个重要的JSON格式转换注解,分别为@RequestBody和@ResponseBody:

1、在pom.xml文件中添加依赖(Jackson)

<!--jackson jar包-->    <dependency>      <groupId>com.fasterxml.jackson.core</groupId>      <artifactId>jackson-core</artifactId>      <version>2.9.2</version>    </dependency>    <dependency>      <groupId>com.fasterxml.jackson.core</groupId>      <artifactId>jackson-databind</artifactId>      <version>2.9.2</version>    </dependency>    <dependency>     <groupId>com.fasterxml.jackson.core</groupId>      <artifactId>jackson-annotations</artifactId>      <version>2.9.0</version>    </dependency>
2、在项目中导入JQuery文件(jquery-3.6.1.js

在项目的/webapp文件夹下创建名称为js的文件夹,在js文件夹中导入jQuery文件。 

3、在spring-mvc.xml文件中配置静态资源

<!--配置静态资源的访问映射,此配置中的文件,将不被前端控制器拦截 -->    <mvc:resourcesmapping="/js/**"location="/js/" />

属性

说明

location

用于定位需要访问的本地静态资源文件路径,具体到某个文件夹

mapping

匹配静态资源全路径,其中“/**”表示文件夹及其子文件夹下的某个具体文件

4、创建一个用户登录页面jsoninput.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head>    <title>jsoninput</title>    <!--链入外部js文件-->    <scripttype="text/javascript"src="../js/jquery-3.6.1.js"></script></head><body>    <div>        <table>            <tr>                <td>账号:</td>                <td><inputtype="text"id="uaccount"></td>            </tr>            <tr>                <td>密码:</td>                <td><inputtype="password"id="upassword"></td>            </tr>        </table>        <buttonid="save">保存</button>        <div>            回显输入的账号:<spanid="iaccount"></span>        </div>    </div></body><!--写js代码--><scripttype="text/javascript">    // 监听保存按钮    $("#save").click(function() {        console.log("点击事件触发...");        // 获取输入的账号、密码        var uaccount = $("#uaccount").val();        var upassword = $("#upassword").val();        console.log(uaccount);        console.log(upassword);        // 构建JSON数据(对象)        var jsonData = {            "uaccount":uaccount,            "upassword":upassword,        }        // 通过异步请求将数据传输给后端        $.ajax({            url"http://localhost:8080/json/getJSON",  // 请求地址            type"POST",                          // 请求方式:GET/POST/PUT/DELETE            contentType"application/json;charset=UTF-8",            dataJSON.stringify(jsonData),        // 发送到服务器的数据            dataType"json",                     // 预期返回的数据类型:json, xml, html, text, script            successfunction(response) {         // 成功回调                console.log("成功:", response);                console.log("account : " , response.inputData.uaccount);                $("#iaccount").text(response.inputData.uaccount);            },            errorfunction(xhr, status, error) { // 失败回调                console.log("失败:", error);            },            completefunction() {                // 无论成功失败都执行                console.log("请求完成");            }        });    });</script></html>
5、创建JSONController.java类(控制器)
import com.nsu.model.Account;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import java.util.HashMap;import java.util.Map;/** * JSON数据模拟 */@Controller@RequestMapping("/json")public class JSONController {    /**     * 接收前端异步请求发送的json数据     * @RequestBody:将json数据转为java对象     * @ResponseBody:将java对象转为json数据     */    @ResponseBody    @PostMapping("/getJSON")    public Object getJSON(@RequestBody Account account){        System.out.println("uaccount = "+ account.getUaccount());        System.out.println("upassword = "+ account.getUpassword());        Map<String ,Object> map = new HashMap<String, Object>();        map.put("msg","success");        map.put("inputData",account);        return map;    }}

仅用于交流学习!

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-04-19 23:26:01 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/531469.html
  2. 运行时间 : 0.109936s [ 吞吐率:9.10req/s ] 内存消耗:4,910.97kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=75c9e6cf39a04203ff1de0e8dba6fd8a
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  1. CONNECT:[ UseTime:0.001113s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002005s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000752s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000654s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001352s ]
  6. SELECT * FROM `set` [ RunTime:0.000532s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001017s ]
  8. SELECT * FROM `article` WHERE `id` = 531469 LIMIT 1 [ RunTime:0.000603s ]
  9. UPDATE `article` SET `lasttime` = 1776612362 WHERE `id` = 531469 [ RunTime:0.005240s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000326s ]
  11. SELECT * FROM `article` WHERE `id` < 531469 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000503s ]
  12. SELECT * FROM `article` WHERE `id` > 531469 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000526s ]
  13. SELECT * FROM `article` WHERE `id` < 531469 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002319s ]
  14. SELECT * FROM `article` WHERE `id` < 531469 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000731s ]
  15. SELECT * FROM `article` WHERE `id` < 531469 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004319s ]
0.112958s