validation的另一種用法，這種用法更加簡單便捷校驗工具類：

package com.alibaba.banff.web.util;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.groups.Default;

    /**
     * 校驗工具類
     * 
     * @author lizhilong
     */
    public class ValidationUtils {
    
        private static Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
    
        public static <T> ValidationResult validateEntity(T obj) {
            ValidationResult result = new ValidationResult();
            Set<ConstraintViolation<T>> set = validator.validate(obj, Default.class);
            // if( CollectionUtils.isNotEmpty(set) ){
            if (set != null && set.size() != 0) {
                result.setHasErrors(true);
                Map<String, String> errorMsg = new HashMap<String, String>();
                for (ConstraintViolation<T> cv : set) {
                    errorMsg.put(cv.getPropertyPath().toString(), cv.getMessage());
                }
                result.setErrorMsg(errorMsg);
            }
            return result;
        }

    public static <T> ValidationResult validateProperty(T obj, String propertyName) {
        ValidationResult result = new ValidationResult();
        Set<ConstraintViolation<T>> set = validator.validateProperty(obj, propertyName, Default.class);
        if (set != null && set.size() != 0) {
            result.setHasErrors(true);
            Map<String, String> errorMsg = new HashMap<String, String>();
            for (ConstraintViolation<T> cv : set) {
                errorMsg.put(propertyName, cv.getMessage());
            }
            result.setErrorMsg(errorMsg);
        }
        return result;
    }
}
 

校驗工具類返回的資料ValidationResult（省略getset）：

package com.aliyun.prophet.facade.partner.flaw;
import java.util.Map;

/**
 * 校驗結果
 * 
 * @author lizhilong
 */
public class ValidationResult {

    // 校驗結果是否有錯
    private boolean             hasErrors;

    // 校驗錯誤資訊
    private Map<String, String> errorMsg;
}
 

Person類（省略getset）：

package com.aliyun.prophet.facade.partner.flaw;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotEmpty;
import org.hibernate.validator.constraints.Range;

public class Person {
    @Length(max=20,message="姓名長度不能大於20")
    @NotEmpty(message="姓名不能為空")
    private String name;
    @Range(min = 0, max = 1, message = "性別只能輸入只能輸入0或1")
    private Integer gender;
    private Integer age;
}</span></code></pre>
 

使用方法：

/**
 * 
 * @author: lizhilong
 */
public class Test {
    @org.junit.Test
    public void testValidation(){
        Person person = new Person();
        person.setAge(12);
        person.setGender(2);
//       person.setName("李智龍");
        ValidationResult result = ValidationUtils.validateEntity(person);
        Map<String, String> map = result.getErrorMsg();
        boolean isError = result.isHasErrors();
        System.out.println("isError: " +isError);
        System.out.println(map);
    }
}

isError: true
{gender=性別只能輸入只能輸入0或1, name=姓名不能為空}

對於ValidationResult校驗結果我們還可以進一步的封裝

/**
     *這個方法的作用就是對於ValidationResult  返回結果
     *
     * @param request
     */
    private String validateParam(S request) {
        StringBuilder sbd = new StringBuilder();
        ValidationResult result = ValidationUtil.validateEntity(request);
        if (result.isHasErrors()) {
            result.getErrorMsg().forEach((k, v) -> {
                sbd.append(v).append("&");
            });
        }
        return sbd.deleteCharAt(sbd.length() - 1).toString();
    }