json与String、 Object、对象、list之间的转化，以及map和JSONObject的转化_list> values转list

将Sting转为Json

JSONObject jsonObject = JSON.parseObject(str);

引入的依赖：
 <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.30</version>
</dependency>
1
2
3
4
5
6
7
8

对象转成json串

String json = JSON.toJSONString(reportData);//关键
1

json串转成对象：

String json = CdpJedis.getByKey(key);
ObjectMapper objectMapper = new com.fasterxml.jackson.databind.ObjectMapper();
ReportData reportData = objectMapper.readValue(json, ReportData.class);

引入的依赖：
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.10.0</version>
</dependency>
1
2
3
4
5
6
7
8
9
10

List转化成json串

JSONArray jsonArray = JSONArray.fromObject(reportNames);//把list转成JSONArray
String json = jsonArray.toString();//json字符串
1
2

String转化成List

import net.sf.json.JSONArray;
List<T> list = new ArrayList<T>();
JSONArray jsonArray = JSONArray.fromObject(str);
list = JSONArray.toList(jsonArray,t); //这里的t是Class<T>

引入的依赖：
<dependency>
    <groupId>net.sf.json-lib</groupId>
    <artifactId>json-lib</artifactId>
    <version>2.4</version>
</dependency>
1
2
3
4
5
6
7
8
9
10
11

List转化成json

JSONArray json = JSONArray.fromObject(object);
String str = json.toString();//把json转换为String
1
2

Map转化为JSONObject：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
// tar 是map
String json = JSON.toJSONString(tar);
JSONObject jsonObject = JSON.parseObject(json);

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.30</version>
</dependency>
1
2
3
4
5
6
7
8
9
10
11

String 转 map：

import com.google.gson.Gson;
Gson gson = new Gson();
  Map<String, Object> map = gson.fromJson(reportMessage, new TypeToken<Map<String, Object>>() {
}.getType());
1
2
3
4

Object转化成JsonArray

Object reportMess = mapSon.get("reportMess");  
JSONArray jsonArray = JSONArray.fromObject(reportMess);

引入的依赖：
  <dependency>
     <groupId>net.sf.json-lib</groupId>
     <artifactId>json-lib</artifactId>
     <version>2.4</version>
 </dependency>bash
1
2
3
4
5
6
7
8
9