javax.validation 效验工具(validation-api组件)使用教程

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在后端开发时，不可避免的需要处理一些校验，如果是写if-else这种代码去校验，那会有一大段这样的代码。不过还好有个校验插件：javax.validation.validation-api，不过一般会引用hibernate的校验组件：org.hibernate.hibernate-validator，它已经引用了validation-api组件。

首先pom.xml引入依赖

   <!-- validator --><dependency><groupId>javax.validation</groupId><artifactId>validation-api</artifactId><version>1.1.0.Final</version></dependency><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-validator</artifactId><version>5.2.4.Final</version></dependency>

Spring配置注入bean

<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>

自己的Violation实体

这里使用的Lombok获取get和set，使用的@Getter注解 @Setter注解

import java.util.List;/*** @Auther: Summer* @Date: 2019-01-05 11:35* @Description:  测试实体类* @versions:1.0*/
@Getter
@Setter
public class TestVo {@NotBlank   // @NotBlank 必须是String类型的private  String  msg;@NonNull  // @NotNull:不能为null，但可以为empty,没有Size的约束private String id;private List<String> str;
}

接口工具类util

/*** @Auther: Summer* @Date: 2019-01-05 11:00* @Description: 接口效验* @versions:1.0*/
public class BeanValidator {private static ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();public static <T> Map<String, String> validate(T t, Class... groups) {Validator validator = validatorFactory.getValidator();Set validateResult = validator.validate(t, groups);if (validateResult.isEmpty()) {   //如果校验有值return Collections.emptyMap();} else {LinkedHashMap errors = Maps.newLinkedHashMap();Iterator iterator = validateResult.iterator();while (iterator.hasNext()) {ConstraintViolation violation = (ConstraintViolation)iterator.next();errors.put(violation.getPropertyPath().toString(), violation.getMessage());}return errors;}}public static Map<String, String> validateList(Collection<?> collection) {Preconditions.checkNotNull(collection); //判断是否为空Iterator iterator = collection.iterator();Map errors;do {if (!iterator.hasNext()) {return Collections.emptyMap();}Object object = iterator.next();errors = validate(object, new Class[0]);} while (errors.isEmpty());return errors;}public static Map<String, String> validateObject(Object first, Object... objects) {if (objects != null && objects.length > 0) {return validateList(Lists.asList(first, objects));} else {return validate(first, new Class[0]);}}

通过controller 验证Slf4j的log.info打印日志信息验证是否成功

package com.mmall.controller;
import com.mmall.common.JsonDate;
import com.mmall.param.TestVo;
import com.mmall.util.BeanValidator;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.Map;
@Controller
@RequestMapping("/test")
@Slf4j
public class TestController {@RequestMapping("/validate.json")@ResponseBodypublic JsonDate validate(TestVo vo){log.info("validate");try {Map<String,String> map = BeanValidator.validateObject(vo);if(map != null && map.entrySet().size() >0){for (Map.Entry<String,String> entry: map.entrySet()){log.info("{}->{}",entry.getKey(),entry.getValue());}}}catch (Exception e){}return JsonDate.success("test,validate");}
}