详解SpringBoot如何统一处理返回的信息

{
  "code": "0",
  "message": "请求成功",
  "data": {
    "name": "Jimmy"
  }
  ""
}

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

// ResultData.java
package com.example.jimmyresponse;
import lombok.Data;
@Data
public class ResultData<T> {
    private String code;
    private String message;
    private T data;
    // 扩展字段，比如接口请求时间
    private long accessTimestamp;
    // 构造函数
    public ResultData() {
        this.accessTimestamp = System.currentTimeMillis();
    }
    // 成功返回
    public static <T> ResultData<T> success(T data) {
        ResultData<T> resultData = new ResultData<>();
        resultData.setCode("10000");
        resultData.setMessage(("请求成功!"));
        resultData.setData(data);
        return resultData;
    }
    // 失败返回
    public static <T> ResultData<T> fail(String code, String message) {
        ResultData<T> resultData = new ResultData<>();
        resultData.setCode(code);
        resultData.setMessage(message);
        return resultData;
    }
}

package com.example.jimmyresponse;
public class User {
    public String name;
    public User(String name) {
        this.name = name; // 用户名
    }
}

// ApiControll.java
package com.example.jimmyresponse;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ApiController<T> {
    @GetMapping("/")
    public T getList() {
        // 模拟用户数据
        User users[] = {
                new User("Jimmy"),
                new User("Ivy")
        };
        return (T) ResultData.success(users); // 信息成功返回
    }
}