JSR303

SpringMVC支持使用JSR303進(jìn)行快速校驗(yàn),我們只需要給需要校驗(yàn)的bean加上響應(yīng)的校驗(yàn)注解即可

使用步驟:

• 給Controller方法參數(shù)對象加上校驗(yàn)注解
• 加上@Valid聲明需要校驗(yàn)
• 咱需要檢驗(yàn)的參數(shù)后面緊跟一個(gè)BindingResult,即可獲取到校驗(yàn)結(jié)果
• 判斷校驗(yàn)結(jié)果是否出錯(cuò),進(jìn)一步來決定業(yè)務(wù)邏輯

基于AOP統(tǒng)一校驗(yàn)

1、基于AOP方式，統(tǒng)一獲取校驗(yàn)錯(cuò)誤并封裝返回
@Aspect
@Component
@Order(2)
public class BindingResultAspect {
    @Pointcut("execution(public * com.gmall.controller.*.*(..))")
    public void BindingResult() {
    }

    @Around("BindingResult()")
    public Object doAround(ProceedingJoinPoint joinPoint) throws Throwable {
        Object[] args = joinPoint.getArgs();
        for (Object arg : args) {
            if (arg instanceof BindingResult) {
                BindingResult result = (BindingResult) arg;
                if (result.hasErrors()) {
                    return new CommonResult().validateFailed(result);
                }
            }
        }
        return joinPoint.proceed();
    }
}
2、自定義校驗(yàn)注解
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD,ElementType.PARAMETER})
@Constraint(validatedBy = FlagValidatorClass.class)
public @interface FlagValidator {
    String[] value() default {};

    String message() default "flag is not found";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};
}
3、自定義校驗(yàn)注解解析器
public class FlagValidatorClass implements ConstraintValidator<FlagValidator,Integer> {
    private String[] values;
    @Override
    public void initialize(FlagValidator flagValidator) {
        this.values = flagValidator.value();
    }

    @Override
public boolean isValid(Integer value, 
ConstraintValidatorContext constraintValidatorContext) {
        boolean isValid = false;
        if(value==null){
            //當(dāng)狀態(tài)為空時(shí)使用默認(rèn)值
            return true;
        }
        for(int i=0;i<values.length;i++){
            if(values[i].equals(String.valueOf(value))){
                isValid = true;
                break;
            }
        }
        return isValid;
    }
}