使用springboot编写自定义参数校验注解

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

	@PostMapping("/doLogin")
    @ResponseBody
    public String doLogin(@Valid LoginVo loginVo){
        return "测试成功!";
    }

@Data
public class LoginVo {
    @NotNull(message = "电话号不能为空!")//不能为空
    @IsMobile//自定义检索电话号注解
    private String mobile;

    @NotNull//不能为空
    @Length(message = "密码不能为空!")(min = 32)//限制密码最短长度
    private String password;
}

@Data
@AllArgsConstructor
@NoArgsConstructor
public class RespBean {
    private long code;//状态码
    private String message;//信息
    private Object data;//数据
	
    public static RespBean success(String msg){
        return new RespBean(200, msg, null);
    }
    
    public static RespBean error(String msg){
        return new RespBean(500, msg, null);
    }
}

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
@Retention(RetentionPolicy.RUNTIME)
@documented
@Constraint(validatedBy = {IsMobilevalidator.class})
public @interface IsMobile {

    boolean required() default true;//默认参数为必填

    String message() default "手机号码格式错误!";//如果手机号格式不对则会抛异常

    Class[] groups() default {};

    Class[] payload() default {};

}

public class ValidatorUtil {

    private static final Pattern mobile_pattern = Pattern.compile("[1]([3-9])[0-9]{9}$");

    public static Boolean isMobile(String mobile){
        if (StringUtils.isEmpty(mobile)){//判断电话号是否为空
            return false;
        }
        Matcher matcher = mobile_pattern.matcher(mobile);//使用正则判断
        return matcher.matches();
    }
}

public class IsMobilevalidator implements ConstraintValidator {
    private boolean required = false;
    @Override
    public void initialize(IsMobile constraintAnnotation) {
        required = constraintAnnotation.required();//设置参数不能为空
    }
    @Override
    public boolean isValid(String value, ConstraintValidatorContext constraintValidatorContext) {
        if (required){//如果参数不为空则判断电话号是否正确
            return ValidatorUtil.isMobile(value);
        }else {
            if (StringUtils.isEmpty(value)){
                return true;
            }else {
                return ValidatorUtil.isMobile(value);
            }
        }
    }
}

前端代码省略。。。

通过测试控制台会抛出一个BindException异常 接下来编写全局异常捕获。

@RestControllerAdvice
public class GlobalExceptionHandler {

	@ExceptionHandler(BindException.class)
	public RespBean exceptionHandler(BindException e){
	    if (e instanceof BindException){
	        return RespBean.error(e.getBindingResult().getAllErrors().get(0).getDefaultMessage());//获取注解中message值
	    }
	    return RespBean.error("服务器异常！");
	}
}