不同JSON包的转换方式

比眉伴天荒 2023-10-08 12:43 43阅读 0赞

1、Json-Lib

maven依赖如下，需注意jdk15，jar包区分jdk1.3和jdk1.5版本

测试demo

import net.sf.json.JSONObject;
    public class JsonLibDemo {
      public static void main(String[] args) {
        //创建测试object
        User user = new User("李宁",24,"北京");
        System.out.println(user);
        //转成json字符串
        JSONObject jsonObject = JSONObject.fromObject(user);
        String json = jsonObject.toString();
        System.out.println(json);
        //json字符串转成对象
        JSONObject jsonObject1 = JSONObject.fromObject(json);
        User user1 = (User) JSONObject.toBean(jsonObject1,User.class);
        System.out.println(user1);
      }
    }

2、org.json

maven依赖如下

测试demo

import org.json.JSONObject;
    public class OrgJsonDemo {
      public static void main(String[] args) {
        //创建测试object
        User user = new User("李宁",24,"北京");
        System.out.println(user);
        //转成json字符串
        String json = new JSONObject(user).toString();
        System.out.println(json);
        //json字符串转成对象
        JSONObject jsonObject = new JSONObject(json);
        String name = jsonObject.getString("name");
        Integer age = jsonObject.getInt("age");
        String location = jsonObject.getString("location");
        User user1 = new User(name,age,location);
        System.out.println(user1);
      }
    }

3、Jackson

maven依赖

<dependency>
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-databind</artifactId>
     <version>2.9.0</version>
    </dependency>

测试demo

import com.fasterxml.jackson.databind.ObjectMapper;
    public class JacksonDemo {
      public static void main(String[] args) {
        //创建测试object
        User user = new User("李宁",24,"北京");
        System.out.println(user);
        //转成json字符串
        ObjectMapper mapper = new ObjectMapper();
        try {
          String json = mapper.writeValueAsString(user);
          System.out.println(json);
          //json字符串转成对象
          User user1 = mapper.readValue(json,User.class);
          System.out.println(user1);
        } catch (java.io.IOException e) {
          e.printStackTrace();
        }
      }
    }

4、Gson

maven依赖

<dependency>
     <groupId>com.google.code.gson</groupId>
     <artifactId>gson</artifactId>
     <version>2.8.1</version>
    </dependency>

测试demo

import com.google.gson.Gson;
    public class GsonDemo {
      public static void main(String[] args) {
        //创建测试object
        User user = new User("李宁",24,"北京");
        System.out.println(user);
        //转成json字符串
        Gson gson = new Gson();
        String json = gson.toJson(user);
        System.out.println(json);
        //json字符串转成对象
        User user1 = gson.fromJson(json,User.class);
        System.out.println(user1);
      }
    }

5、FastJson

maven依赖

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>fastjson</artifactId>
     <version>1.2.37</version>
    </dependency>

测试demo

import com.alibaba.fastjson.JSON;
    public class FastJsonDemo {
      public static void main(String[] args) {
        //创建测试object
        User user = new User("李宁",24,"北京");
        System.out.println(user);
        //转成json字符串
        String json = JSON.toJSON(user).toString();
        System.out.println(json);
        //json字符串转成对象
        User user1 = JSON.parseObject(json,User.class);
        System.out.println(user1);
      }
    }