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
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