<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.1</version>
        </dependency>

import org.apache.ibatis.type.Alias;
@Alias(value="UserDo")
public class UserDo {
    private Integer id;
    private String name;
    private String password;
// 下面是 getter 和 setter 方法。。。
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

    @Test
    public void mytest(){
        Gson gson = new Gson();
        UserDo user = new UserDo();
        user.setId(1);
        user.setPassword("111");
        user.setName("1");
        String jsonObject = gson.toJson(user); 
        System.out.println(jsonObject);
        UserDo userb = gson.fromJson(jsonObject, UserDo.class);
        System.out.println(userb);
    }

参考资料

• https://www.jianshu.com/p/e740196225a4