Fastjson解析嵌套Map例子

谁践踏了优雅 2022-09-25 06:19 207阅读 0赞

由于在实际工作中使用fastjson解析嵌套map的场景非常多，所以在此备忘一下：

引入阿里的fastjson的pom：  
““  
  
com.alibaba  
fastjson  
1.2.15

““

一个比较复杂的json例子：  
`{ "actId": "1800025", "originCode": 1, "role": "TEACHER", "time": 1471077017804, "userId": "1111", "userName": "测试教师", "userIcon": "xyz", "userIp": "1.1.1.1", "countyId": "370105", "countyName": "天桥区", "schoolId": "1234", "schoolName": "测试小学", "data": { "subjectId": "020", "subjectName": "数学", "uploadFileList": [ { "teachFileType": "1", "custom": "xtz" }, { "teachFileType": "1" } ] } }`

使用fastjson的解析代码：  
““java  
import com.alibaba.fastjson.JSON;

import java.util.List;  
import java.util.Map;

/\*\*  
\* Created by Administrator on 2016/8/12.  
\*/  
public class ParserJson \{

/***
     *
      * @param map 需要打印的Map结构
     */
    public static void showMap(Map<String,Object> map){
        for(Map.Entry<String,Object> kv:map.entrySet()){
            System.out.println(kv.getKey()+"  "+kv.getValue());
        }
    }
    
    
    public static void main(String[] args) throws Exception {
    
    
        String json="{\"actId\":\"2300003\",\"originCode\":1,\"role\":\"TEACHER\"" +
                ",\"time\":1470126407000,\"userId\":\"1111\",\"userName\":\"测试教师\",\"userIcon\":\"xyz\",\"userIp\":\"1.1.1.1\",\"countyId\":\"370105\",\"countyName\":\"天桥区\",\"schoolId\":\"1234\",\"schoolName\":\"测试小学\",\"data\":{\"subjectId\":\"020\",\"subjectName\":\"数学\"," +
                "\"uploadFileList\":[{\"teachFileType\":\"1\"},{\"teachFileType\":\"1\",\"custom\":\"xt\"},{\"teachFileType\":\"1\"}]}}";
    
    
    
    
        Map<String,Object> map=(Map)JSON.parse(json);
        System.out.println("打印第一层map");
        showMap(map);
        Map<String,Object> dataMap=(Map<String, Object>) map.get("data");
        System.out.println("打印第二层map");
        showMap(dataMap);
        System.out.println("打印第三层list+map");
       List<Map<String,Object>> fileList= (List<Map<String, Object>>) dataMap.get("uploadFileList");
        for(Map<String,Object> soj:fileList){
            System.out.println(soj);
            Map<String,Object> detailData=soj;
            showMap(detailData);
            System.out.println("----------------------------------------");
        }
    
    
    }

`解析结果：`  
ParserJson  
打印第一层map  
role TEACHER  
data \{“uploadFileList”:\[\{“teachFileType”:”1”\},\{“custom”:”xt”,”teachFileType”:”1”\},\{“teachFileType”:”1”\}\],”subjectId”:”020”,”subjectName”:”数学”\}  
actId 2300003  
userName 测试教师  
userId 1111  
countyId 370105  
schoolId 1234  
userIp 1.1.1.1  
originCode 1  
time 1470126407000  
userIcon xyz  
schoolName 测试小学  
countyName 天桥区  
打印第二层map  
uploadFileList \[\{“teachFileType”:”1”\},\{“custom”:”xt”,”teachFileType”:”1”\},\{“teachFileType”:”1”\}\]  
subjectId 020  
subjectName 数学  
打印第三层list+map  
\{“teachFileType”:”1”\}

## teachFileType 1 ##

\{“custom”:”xt”,”teachFileType”:”1”\}  
custom xt

## teachFileType 1 ##

\{“teachFileType”:”1”\}

## teachFileType 1 ##

Process finished with exit code 0

““