hibernate Validator verification tools

package com.merchant.util;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;

import com.modules.api.vo.PacketOrderDetailInfo;
import com.modules.api.vo.PacketOrderInfo;
/**
 * hibernate Validator校验工具类
 * @author zhangmingyue
 *
 */
public class ValidatorUtil {
   private static ValidatorFactory factory;
    public static Validator validator;
    
    public static void init() {
        factory = Validation.buildDefaultValidatorFactory();
        validator = factory.getValidator();
    }

    public static void clean() {
        factory.close();
    }
   
    public static void main(String[] args) {
       init();
       PacketOrderInfo info  = new PacketOrderInfo();
       List<PacketOrderDetailInfo> items = new ArrayList<PacketOrderDetailInfo>();
       PacketOrderDetailInfo item = new PacketOrderDetailInfo();
       
       items.add(item);
       info.setItems(items);
       //info.setRev_tel("手机号");
       Set<ConstraintViolation<PacketOrderInfo>> set = validator.validate(info);
        for (ConstraintViolation<PacketOrderInfo> c : set) {
            System.out.println(c.getMessageTemplate());
            return;
        }
        clean();
   }
}

import org.hibernate.validator.constraints.NotBlank;
import org.hibernate.validator.constraints.NotEmpty;

import javax.validation.Valid;
import java.io.Serializable;

public class PacketOrderInfo implements Serializable {
    /**
     * 订单编号
     */
    @NotBlank(message="订单编号不能为空")
    private String ordero;
    /**
     * 商品信息
     * 注意：@Valid，无该注解，无法加载出该对象内属性校验
     */
    @Valid
    @NotEmpty(message="商品信息不能为空")
    private List<PacketOrderDetailInfo> items = new ArrayList<PacketOrderDetailInfo>();


}