java对象和字符串之间的转化的几种方式

最新推荐文章于 2025-10-11 18:20:05 发布

转载最新推荐文章于 2025-10-11 18:20:05 发布 · 2.7k 阅读

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原文链接：https://www.jb51.net/article/157516.htm

文章标签：

#json #字符串

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这篇博客展示了如何使用不同Java库（包括minedu-dev、json-lib、org.json和Jackson）将对象转换为JSON字符串，以及如何将JSON字符串反序列化回对象。示例中包含了从对象到JSON和反向转换的完整代码片段。

import net.minudev.json.JSONArray;
import com.google.gson.Gson;
import com.google.common.reflect.TypeToken;

public class minudevJsonDemo{

	public static String obj2JsonArray(List<Object> list){
		return JSONArray.toJSONString(list);
	}
		
	public static List<Object> json2Obj(String s){
		Gson gson = new Gson();
		return gson.fromJson(s, new TypeToken<List<Object>>(){}.getType())
	}
	
}

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);
  }
}

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);
  }
}

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();
    }
  }
}

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);
  }
}