hiberante-validator 自定義日期格式驗證

package com.yhbc.validation;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.Payload;
import javax.validation.ReportAsSingleViolation;

/**
 * 日期格式驗證,能夠在{@code format}中添加有效的日期格式
 * @author Canaan
 * @date 2017年3月8日
 */
@Documented
@Constraint(validatedBy = { DateValueValidator.class })
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
@Retention(RUNTIME)
@ReportAsSingleViolation
public @interface DateValue {
	
	String message() default "日期格式不正確";

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

	Class<? extends Payload>[] payload() default { };

	/**
	 * 有效的日期格式
	 */
	String[] format() default {};  
	
	/**
	 * Defines several {@link DateValue} annotations on the same element.
	 *
	 * @see com.yhbc.validation.DateValue.DateValue
	 */
	@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })
	@Retention(RUNTIME)
	@Documented
	@interface List {
		DateValue[] value();
	}
}

 

package com.yhbc.validation;

import java.text.SimpleDateFormat;

import javax.validation.ConstraintValidator;  
import javax.validation.ConstraintValidatorContext;

public class DateValueValidator implements ConstraintValidator<DateValue, String> {
	
	private String[] formats;
	
	@Override
	public void initialize(DateValue constraintAnnotation) {
		formats = constraintAnnotation.format();
	}

	@Override
	public boolean isValid(String value, ConstraintValidatorContext context) {
		if(value==null || "".equals(value.trim())){return true;}
		if(formats.length==0){return true;}
		
		for (String string : formats) {
		        try{  
		        	SimpleDateFormat formatter = new SimpleDateFormat(string);  
		            formatter.parse(value);  
		        }catch(Exception e){  
		            return false;  
		        }  
		}
		return true;
	}
	
}