java定义通用返回结果类ResultVO使用示例详解

import lombok.Data;
import java.io.Serializable;
/**
 * 通用返回结果类
 * @param <T>
 */
@Data
public class ResultVO<T> implements Serializable {
    /**
     * 错误码
     */
    private int code;
    /**
     * 内容
     */
    private T data;
    /**
     * 消息
     */
    private String message;
    /**
     * 描述
     */
    private String description;
    public ResultVO(int code, T data, String message, String description) {
        this.code = code;
        this.data = data;
        this.message = message;
        this.description = description;
    }
    public ResultVO(int code, T data) {
        this(code,data,"","");
    }
    public ResultVO(int code, T data, String message) {
        this(code,data,message,"");
    }
}

/**
 * 通用返回响应工具类
 *
 * @author leovany
 * @date 2023/09/23
 */
public class ResultUtils {
    /**
     * 成功
     *
     * @param data 数据
     * @return {@link ResultVO}<{@link T}>
     */
    public static <T> ResultVO<T> success(T data) {
        return new ResultVO<T>(0, data, "success");
    }
    /**
     * 错误
     *
     * @param code        错误码
     * @param message     信息
     * @param description 描述
     * @return {@link ResultVO}
     */
    public static ResultVO error(int code, String message, String description) {
        return new ResultVO<>(code, null, message, description);
    }
}

@PostMapping("/login")
public ResultVO<User> userLogin(@RequestBody UserLoginRequest userLoginRequest, HttpServletRequest request) {
    String userAccount = userLoginRequest.getUserAccount();
    String userPassword = userLoginRequest.getUserPassword();
    // 参数校验
    if (StringUtils.isAnyBlank(userAccount, userPassword)) {
        return ResultUtils.error(40000,"参数错误","参数不能为空");
    }
    // 从数据库查找用户
    User user = userService.doLogin(userAccount, userPassword, request);
    return ResultUtils.success(user);
}

{
    "code": 0,
    "data": {
        "id": 10,
        "username": "admin"
    },
    "message": "success",
    "description": ""
}