java---请求body实体校验和异常抛出处理（异常处理针对servert容器，webFlux 另一篇文章描述）

本文主要解决问题：
1.实体参数校验通过框架层面解决，灵活使用javax.validation
2.针对参数格式异常，统一抛出ParamException,框架层面拦截异常，解析成code和message返回给前端

参数校验：

1.controller入参前加上@Validated or @Valid
2.参数如果表单嵌套 参数前加上@Valid

controller：

    @ApiOperation("用户注册")
    @PostMapping("/user-service/users/user")
    public CommonResult<Long> register(@Validated @RequestBody UserRequest userRequest) {
        return CommonResult.ok(userService.register(userRequest));
    }

request

    @ApiModelProperty("用户名")
    @NotEmpty(message = "姓名不能为空")
    private String userName;
    @ApiModelProperty("邮箱")
    private String email;
    @ApiModelProperty("手机")
    @NotEmpty(message = "手机不能为空")
    private String cellphone;
    @NotEmpty(message = "角色不能为空")
    @EnumValue(enumClass = Role.class, enumMethod = "isValidName")
    @ApiModelProperty("角色")
    private String role;
    @ApiModelProperty("密码")
    @NotEmpty(message = "密码不能为空")
    private String password;
    @ApiModelProperty("家庭信息")
    @Valid
    private Family family;

异常处理
BindException和MethodArgumentNotValidException 是spring验证框架抛出的异常，需要拦截解析处理

@Slf4j
@RestControllerAdvice
@Aspect
public class ExceptionAspect {

    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    @ExceptionHandler(value = {GobalException.class})
    @ResponseBody
    public CommonResult<Void> resolvePlatformException(GobalException e) {
        log.error("platform exception", e);
        return CommonResult.error(e.getErrorCode(), e.getMessage());
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler({ParamException.class})
    public CommonResult<Void> resolveParamException(ParamException e) {
        log.error("param exception", e);
        return CommonResult.error(e.getErrorCode(), e.getMessage());
    }
    
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(BindException.class)
    public CommonResult<Void> exceptionHandler(BindException e) {
        String failMsg = Objects.requireNonNull(e.getBindingResult().getFieldError()).getField() + ":" + Objects
                .requireNonNull(e.getBindingResult().getFieldError()).getDefaultMessage();
        log.error("bind exception", e);
        return CommonResult.error(ErrorCode.PARAMETER_ERROR.getCode(), failMsg);
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public CommonResult<Void> exceptionHandler(MethodArgumentNotValidException e) {
        String failMsg = Objects.requireNonNull(e.getBindingResult().getFieldError()).getField() + ":" + Objects
                .requireNonNull(e.getBindingResult().getFieldError()).getDefaultMessage();
        log.error("bind exception", e);
        return CommonResult.error(ErrorCode.PARAMETER_ERROR.getCode(), failMsg);
    }

    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    @ExceptionHandler(Exception.class)
    public CommonResult<Void> resolveException(Exception e) {
        log.error(" exception", e);
        return CommonResult.error(ErrorCode.COMMON_SERVER_ERROR.getCode(), ErrorCode.COMMON_SERVER_ERROR.getMessage());
    }
}

依赖

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-validation</artifactId>
    </dependency>

本文地址：https://blog.csdn.net/u014469254/article/details/109621594