解析前端传来的json字符串

叁歲伎倆 2023-10-02 18:41 18阅读 0赞

## 1.什么是json ##

JSON是Javascript-Object-notation的简称，是一种轻量级的数据交换格式。

## 2.简单json的解析 ##

>     @Test
>     public void test1() {
>         String jsonString = "{\"name\":\"zhangsan\",\"password\":\"zhangsan123\",\"email\":\"10371443@qq.com\"}";
>         JSONObject json = JSONObject.parseObject(jsonString);
>         User user = new User();
>         user.setName(json.getString("name"));
>         user.setPassword(json.getString("password"));
>         user.setEmail(json.getString("email"));
>         System.out.println(user.toString());
>     }
>     @Data
>     class User {
>         private String name;
>         private String password;
>         private String email;
>     }

将键值对的json字符串转换为json对象，然后获取json对象中的数据即可

## 3.企业返回对象的json解析 ##

>     @Test
>         public void test2() {
>             // 假设这就是返回的json格式的字符串
>             String jsonString = "{\n" +
>                     "    \"code\": \"10000\",\n" +
>                     "    \"charge\": false,\n" +
>                     "    \"remain\": 1305,\n" +
>                     "    \"msg\": \"查询成功\",\n" +
>                     "    \"result\": {\n" +
>                     "        \"error_code\": 0,\n" +
>                     "        \"reason\": \"成功\",\n" +
>                     "        \"result\": {\n" +
>                     "            \"realname\": \"乐天磊\",\n" +
>                     "            \"idcard\": \"350721197702134399\",\n" +
>                     "            \"isok\": true\n" +
>                     "        }\n" +
>                     "    }\n" +
>                     "}";
>     
>             //使用fastjson解析json格式的字符串为json对象
>             JSONObject jsonObject = JSONObject.parseObject(jsonString);
>     
>             //获取通信标识code
>             String code = jsonObject.getString("code");
>     
>             //判断通信是否成功
>     //        if (!StringUtils.equals("10000", code)) {
>     //            return StandardResult.faild("通信异常");
>     //        }
>             //获得业务处理结果，result中存储的也是json字符串
>             Boolean isok =         jsonObject.getJSONObject("result").getJSONObject("result").getBoolean("isok");
>             System.out.println("isok = " + isok);
>             String idcard =         jsonObject.getJSONObject("result").getJSONObject("result").getString("idcard");
>             System.out.println("idcard = " + idcard);
>             String realname =         jsonObject.getJSONObject("result").getJSONObject("result").getString("realname");
>             System.out.println("realname = " + realname);
>     
>     //        if (!isok) {
>     //            return Result.error("真实姓名和身份证号码不匹配");
>     //        }
>     
>         }

将前端返回的企业返回对象转化为可用的数据

## 4.嵌套对象的json类型转化 ##

>     @Test
>     public void test3() {
>         String str="{\n" +
>                 "\t\"name\": \"zhangsan\",\n" +
>                 "\t\"age\": \"18\",\n" +
>                 "\t\"score\": [{\n" +
>                 "\t\t\t\"year\": \"2016\",\n" +
>                 "\t\t\t\"yuwen\": \"60\",\n" +
>                 "\t\t\t\"shuxue\": \"60\",\n" +
>                 "\t\t\t\"yingyu\": \"60\"\n" +
>                 "\t\t},\n" +
>                 "\t\t{\n" +
>                 "\t\t\t\"year\": \"2017\",\n" +
>                 "\t\t\t\"yuwen\": \"80\",\n" +
>                 "\t\t\t\"shuxue\": \"80\",\n" +
>                 "\t\t\t\"yingyu\": \"80\"\n" +
>                 "\t\t},\n" +
>                 "\t\t{\n" +
>                 "\t\t\t\"year\": \"2018\",\n" +
>                 "\t\t\t\"yuwen\": \"100\",\n" +
>                 "\t\t\t\"shuxue\": \"100\",\n" +
>                 "\t\t\t\"yingyu\": \"100\"\n" +
>                 "\t\t}\n" +
>                 "\t]\n" +
>                 "}";
>         JsonRootBean jsonRootBean = JSONObject.parseObject(str, JsonRootBean.class);
>         System.out.println("jsonRootBean = " + jsonRootBean);
>     }
>     @Data
>     @ToString
>     public static class JsonRootBean {
>     
>         private String name;
>         private String age;
>         private List<Score> score;
>         @Data
>         @ToString
>         public static class Score {
>     
>             private String year;
>             private String yuwen;
>             private String shuxue;
>             private String yingyu;
>         }
>     }

嵌套多个对象的json字符串转化为相应的对象