Java之字符串转换成Java对象方式

public static void main(String[] args) {
        String testParam = "{\"id\":\"1001\",\"name\":\"oowangfanoo\",\"sex\":\"30\"}";
        TestEntity testEntity = JSON.toJavaObject(JSONObject.parseObject(testParam),TestEntity.class) ;
        System.out.println(testEntity.toString());
    }

JSONArray jsonArray= JSONArray.parseArray(jsonObject.get("body").toString());
        System.out.println(jsonArray +"：：：："+ jsonArray.size());
        for(int i=0;i<jsonArray.size();i++){
            JSONObject object= (JSONObject) jsonArray.get(i);
            System.out.println(object.get("cabinet_id"));
        }

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

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);
  }
}

 <dependency>  
            <groupId>net.sf.json-lib</groupId>  
            <artifactId>json-lib</artifactId>  
            <version>2.2.3</version>  
            <classifier>jdk15</classifier>  
 </dependency>

public static void jsonStrToJava(){
//定义两种不同格式的字符串
String objectStr="{\"name\":\"JSON\",\"age\":\"24\",\"address\":\"北京市海淀区\"}";
String arrayStr="[{\"name\":\"JSON\",\"age\":\"24\",\"address\":\"北京市海淀区\"}]";
//1、使用JSONObject
JSONObject jsonObject=JSONObject.fromObject(objectStr);
Student stu=(Student)JSONObject.toBean(jsonObject, Student.class);
//2、使用JSONArray
JSONArray jsonArray=JSONArray.fromObject(arrayStr);
//获得jsonArray的第一个元素
Object o=jsonArray.get(0);
JSONObject jsonObject2=JSONObject.fromObject(o);
Student stu2=(Student)JSONObject.toBean(jsonObject2, Student.class);
System.out.println("stu:"+stu);
System.out.println("stu2:"+stu2);
}

<dependency>
 <groupId>org.json</groupId>
 <artifactId>json</artifactId>
 <version>20170516</version>
</dependency>

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);
  }
}

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

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();
    }
  }
}

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

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);
  }
}