Fastjson解析嵌套Map例子

Myth丶恋晨 2022-04-11 06:50 822阅读 0赞

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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：  
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<dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.15</version>
    </dependency>

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一个比较复杂的json例子：  
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{
       
        "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"
                }
            ]
        }
    }

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使用fastjson的解析代码：  
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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("----------------------------------------");
            }
    
        }
    
    
    }

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解析结果：  
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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

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