java中对象转json字符串的三种常用方式

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

// 创建一个对象
MyClass obj = new MyClass(1, "Example");

// 创建ObjectMapper实例
ObjectMapper objectMapper = new ObjectMapper();

try {
    // 将对象转换为JSON字符串
    String jsonString = objectMapper.writeValueAsString(obj);
    System.out.println(jsonString);
} catch (JsonProcessingException e) {
    e.printStackTrace();
}

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.5</version>
</dependency>

import com.google.gson.Gson;

// 创建一个对象
MyClass obj = new MyClass(1, "Example");

// 创建Gson实例
Gson gson = new Gson();

// 将对象转换为JSON字符串
String jsonString = gson.toJson(obj);
System.out.println(jsonString);

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.8</version>
</dependency>

//将对象（vo）转为JSONObject
       JSONObject jsonObject = (JSONObject) JSONObject.toJSON(order);
//将对象数据转为字符串               
       String jsonString = JSON.toJSONString(jsonObject);

	<dependency>
			<groupId>cn.hutool</groupId>
			<artifactId>hutool-all</artifactId>
			<version>5.8.20</version>
		</dependency>