springboot的validation检验和RestControllerAdvice异常处理简要

1. 首先是validation

• 引入依赖

        
            org.springframework.boot
            spring-boot-starter-validation
        

• controller，vo标上相应的注解

//controller
 public RespBean doLogin(@Valid LoginVo loginVo){}
//vo
@Data
public class LoginVo {
    @NotNull
    @IsMobile
    private String mobile;
    @NotNull
    private String password;
}

• 写自定义注解
  @Constraint(validatedBy = {具体验证类的.class} )

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
@documented
@Constraint(validatedBy = { IsMobilevalidator.class})
public @interface IsMobile {
    boolean required() default true;
    // message是违反验证时会报的信息
    String message() default "手机号格式错误";
    Class[] groups() default { };
    Class[] payload() default { };
}

-注解的具体验证类（根据此类判断是否验证通过）

	//需要实现ConstraintValidator，annotation是自定义的注解，T是你所标注注解地方上的字段比如Mobile的具体值，比如前段传过来的手机号为xxx，为字符串类型，然后这里的value就是手机号值。
 public class IsMobilevalidator implements ConstraintValidator {
    private boolean required = false;
    @Override
    public void initialize(IsMobile constraintAnnotation) {
        required = true;
    }
    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        if (required){
            return ValidatorUtil.isMobile(value);
        }
        return true;
    }
}

2. RestControllerAdvice

首先需要一个继承RuntimeException的自定义异常类，可以需要一个属性，抛出异常时可以new GlobalException(),传入参数

@Data
@AllArgsConstructor
@NoArgsConstructor
public class GlobalException extends RuntimeException{
    private RespBeanEnum respBeanEnum;
}

然后需要一个handlcer，根据抛出的异常，返回对应异常的错误给前端

@RestControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(Exception.class)
    public RespBean exceptionHandler(Exception e){
        if (e instanceof GlobalException){
            GlobalException ex = (GlobalException) e;
            return RespBean.error(ex.getRespBeanEnum());
        }else if (e instanceof BindException){
            BindException ex = (BindException) e;
            RespBean respBean = RespBean.error(RespBeanEnum.BIND_ERROR);
            respBean.setMsg("参数校验异常"+ex.getBindingResult().getAllErrors().get(0).getDefaultMessage());
            return respBean;
        }
        return RespBean.error(RespBeanEnum.ERROR);
    }
}