Fastjson解析嵌套Map例子

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：

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

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：

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"},{"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

（编辑：李大同）

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