一 lombok 使用。

package org.com.d5;

import lombok.AllArgsConstructor;
import lombok.Data;

@Data
@AllArgsConstructor
public class Student {

    private String name;
    private int age;

}

二 Gson 的使用。

去 mvn 仓库 mvnrepository.com/ 找依赖,放入pom

<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.5</version>
</dependency>

package org.com.d5;

import com.google.gson.Gson;

import java.util.ArrayList;
import java.util.List;

public class Demo {
    public static void main(String[] args) {
        Gson gson = new Gson();

        List<Student> stus = new ArrayList<Student>();
        Student stu = new Student("xxx", 3);
        stus.add(stu);


        System.out.println(gson.toJson(stus));
        System.out.println(gson.toJson(stu));


    }
}