SpringBoot利用validation-api如何实现参数校验

<!--参数校验-->
<dependency>
  <groupId>javax.validation</groupId>
  <artifactId>validation-api</artifactId>
  <version>2.0.1.Final</version>
</dependency>

<!--提供一些字符串操作-->
<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-lang3</artifactId>
  <version>3.3.2</version>
</dependency>

<!--lombok-->
<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <version>1.18.2</version>
  <optional>true</optional>
</dependency>

<!--knife4j接口-->
<dependency>
  <groupId>com.github.xiaoymin</groupId>
  <artifactId>knife4j-spring-boot-starter</artifactId>
  <version>2.0.4</version>
</dependency>

@Setter
@Getter
@ToString
@ApiModel("用户对象")
public class UserPojoReq extends Request implements Serializable {
  private static final long serialVersionUID = -354657839724457905L;

  @ApiModelProperty(required = true, notes = "主键", example = "123")
  private String id;

  @ApiModelProperty(required = true, notes = "用户名", example = "luo")
  @NotNull(message = "用户姓名为必填项，不得为空")
  @Size(min = 2,max = 20,message = "用户名长度要在2—8个字符")
  private String name;

  @ApiModelProperty(required = true, notes = "消息", example = "消息")
  private String msg;

}

@Getter
public enum CouponTypeEnum {

  PARAMETER_ERROR(1001, "请求参数有误!"),
  UNKNOWN_ERROR(9999, "未知的错误!”);

  /**
   * 状态值
   */
  private int couponType;


  /**
   * 状态描述
   */
  private String couponTypeDesc;

  CouponTypeEnum(int couponType, String couponTypeDesc){
    this.couponType = couponType;
    this.couponTypeDesc = couponTypeDesc;
  }

  public static String getDescByType(int couponType) {
    for (CouponTypeEnum type : CouponTypeEnum.values()) {
      if (type.couponType == couponType) {
        return type.couponTypeDesc;
      }
    }
    return null;
  }


  public String getcouponTypeStr(){
    return String.valueOf(this.couponType);
  }
}

/**
 * 业务自定义异常
 */
@Getter
public class BusinessException extends RuntimeException {

  private static final long serialVersionUID = -1895174013651345407L;
  private final CouponTypeEnum errorCode;
  private String primaryErrorCode;
  private String primaryErrorMsg;
  private String primaryErrorIP;

  public BusinessException(CouponTypeEnum errorCode) {
    this(errorCode, errorCode.getCouponTypeDesc());
  }
  public BusinessException(CouponTypeEnum errorCode, String message) {
    super(message);
    this.errorCode = errorCode;
  }
  public BusinessException(CouponTypeEnum errorCode, String message,String primaryErrorCode,String primaryErrorMsg,String primaryErrorIP) {
    super(message);
    this.errorCode = errorCode;
    this.primaryErrorCode=primaryErrorCode;
    this.primaryErrorMsg=primaryErrorMsg;
    this.primaryErrorIP=primaryErrorIP;
  }
  public BusinessException(CouponTypeEnum errorCode,String primaryErrorCode,String primaryErrorMsg,String primaryErrorIP) {
    this(errorCode, errorCode.getCouponTypeDesc());
    this.primaryErrorCode=primaryErrorCode;
    this.primaryErrorMsg=primaryErrorMsg;
    this.primaryErrorIP=primaryErrorIP;
  }

}

@RestControllerAdvice("com.luo.producer.controller")
@Slf4j
public class GlobalExceptionHandler {
  
  
  /**
   * 忽略参数异常处理器
   *
   * @param e 忽略参数异常
   * @return Response
   */
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  @ExceptionHandler(MissingServletRequestParameterException.class)
  public Response parameterMissingExceptionHandler(MissingServletRequestParameterException e) {
    log.error("", e);
    return new Response(CouponTypeEnum.PARAMETER_ERROR.getcouponTypeStr(), "请求参数 " + e.getParameterName() + " 不能为空");
  }


  /**
   * 缺少请求体异常处理器
   *
   * @param e 缺少请求体异常
   * @return Response
   */
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  @ExceptionHandler(HttpMessageNotReadableException.class)
  public Response parameterBodyMissingExceptionHandler(HttpMessageNotReadableException e) {
    log.error("", e);
    return new Response(CouponTypeEnum.PARAMETER_ERROR.getcouponTypeStr(), "参数体不能为空");
  }


  /**
   * 参数效验异常处理器
   *
   * @param e 参数验证异常
   * @return ResponseInfo
   */
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  @ExceptionHandler(MethodArgumentNotValidException.class)
  public Response parameterExceptionHandler(MethodArgumentNotValidException e) {
    log.error("", e);
    // 获取异常信息
    BindingResult exceptions = e.getBindingResult();
    // 判断异常中是否有错误信息，如果存在就使用异常中的消息，否则使用默认消息
    if (exceptions.hasErrors()) {
      List<ObjectError> errors = exceptions.getAllErrors();
      if (!errors.isEmpty()) {
        // 这里列出了全部错误参数，按正常逻辑，只需要第一条错误即可
        FieldError fieldError = (FieldError) errors.get(0);
        return new Response(CouponTypeEnum.PARAMETER_ERROR.getcouponTypeStr(), fieldError.getDefaultMessage());
      }
    }
    return new Response(CouponTypeEnum.PARAMETER_ERROR);
  }


  /**
   * 自定义参数错误异常处理器
   *
   * @param e 自定义参数
   * @return ResponseInfo
   */
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  @ExceptionHandler({BusinessException.class})
  public Response paramExceptionHandler(BusinessException e) {
    log.error("", e);
    // 判断异常中是否有错误信息，如果存在就使用异常中的消息，否则使用默认消息
    if (!StringUtils.isEmpty(e.getMessage())) {
      return new Response(CouponTypeEnum.PARAMETER_ERROR.getcouponTypeStr(), e.getMessage());
    }
    return new Response(CouponTypeEnum.PARAMETER_ERROR);
  }


  /**
   * 其他异常
   *
   * @param e
   * @return
   */
  @ResponseStatus(HttpStatus.BAD_REQUEST)
  @ExceptionHandler({Exception.class})
  public Response otherExceptionHandler(Exception e) {
    log.error("其他异常", e);
    // 判断异常中是否有错误信息，如果存在就使用异常中的消息，否则使用默认消息
    if (!StringUtils.isEmpty(e.getMessage())) {
      return new Response(CouponTypeEnum.UNKNOWN_ERROR.getcouponTypeStr(), e.getMessage());
    }
    return new Response(CouponTypeEnum.UNKNOWN_ERROR);
  }
}

@RestController
@Slf4j
public class UserController {

  @PostMapping("/helloluo")
  @MyPermissionTag(value = "true")
  public String helloluo(@RequestBody @Valid UserPojoReq userPojoReq){
    return "Hello World”+userPojoReq;
  }
}