前言
本人先将用到的配置、工具类贴出来，然后一步步告诉大家怎么使用
JSR303 是一套JavaBean参数校验的标准，它定义了很多常用的校验注解，我们可以直接将这些注解加在我们JavaBean的属性上面，就可以在需要校验的时候进行校验了。
注解如下：
Hibernate validator 在JSR303的基础上对校验注解进行了扩展，扩展注解如下：
pom中添加注解
<!--jsr 303--> <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> <version>1.1.0.Final</version> </dependency> <!-- hibernate validator--> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>5.2.0.Final</version> </dependency>
Spring配置
<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
@AllArgsConstructor 这个注解是lombok中为类提供一个全参的构造方法
package com.alibaba.xianzhi.validator;import java.io.Serializable;import lombok.AllArgsConstructor;import lombok.Getter;/** * Created by Jackielee on 2017 * @author: lizhilong * @date: 2017-11-14 18:01:34 */@Getter@AllArgsConstructorpublic class Violation implements Serializable { private static final long serialVersionUID = -1731546219600067986L; private final String message; private final Object bean; private final String property; private final Object value;}
封装一个ViolationBuild
后面会说这个类的用法
package com.alibaba.xianzhi.validator;import java.util.ArrayList;import java.util.HashSet;import java.util.List;import java.util.Set;import javax.validation.ConstraintViolation;import lombok.AllArgsConstructor;import lombok.Getter;import org.apache.commons.collections.CollectionUtils;/** * @author: lizhilong * @date: 2017-11-15 11:41:12 */@AllArgsConstructorpublic class ViolationBuild{ @Getter private Set<Violation> violations; public String getMessage() { List<String> list = new ArrayList<String>(); for (Violation violation : violations) { list.add(violation.getMessage()); } return list.size() > 0 ? list.get(0) : ""; } public static <T> ViolationBuild build(Set<ConstraintViolation<T>> cvs) { Set<Violation> result = new HashSet<Violation>(); if (CollectionUtils.isNotEmpty(cvs)) { for (ConstraintViolation cv : cvs) { result.add(new Violation(cv.getMessage(), cv.getRootBean() == null ? null : cv.getRootBean().toString(), cv.getPropertyPath() == null ? null : cv.getPropertyPath().toString(), cv.getInvalidValue())); } } return new ViolationBuild(result); }}
用来校验实体，构建并存储校验后的信息ValidatorProvider
package com.alibaba.xianzhi.validator;import java.util.Set;import javax.validation.ConstraintViolation;import javax.validation.ValidationException;import javax.validation.Validator;import lombok.AllArgsConstructor;import lombok.Getter;/** * @author: lizhilong * @date: 2017-11-15 11:40:59 */@AllArgsConstructor@Getterpublic class ValidatorProvider { private final Validator validator; public <T> ViolationBuild validate(T object) { Set<ConstraintViolation<T>> violations; try { violations = validator.validate(object); } catch (IllegalArgumentException iae) { throw iae; } catch (ValidationException ve) { throw ve; } return ViolationBuild.build(violations); } public <T> ViolationBuild validate(T object, Class<?>... groups) { Set<ConstraintViolation<T>> violations; try { violations = validator.validate(object, groups); } catch (IllegalArgumentException iae) { throw iae; } catch (ValidationException ve) { throw ve; } return ViolationBuild.build(violations); } public <T> ViolationBuild validateProperty(T object, String propertyName, Class<?>... groups) { Set<ConstraintViolation<T>> violations; try { violations = validator.validateProperty(object, propertyName, groups); } catch (IllegalArgumentException iae) { throw iae; } catch (ValidationException ve) { throw ve; } return ViolationBuild.build(violations); } public <T> ViolationBuild validateValue(Class<T> beanType, String propertyName, Object value, Class<?>... groups) { Set<ConstraintViolation<T>> violations; try { violations = validator.validateValue(beanType, propertyName, value, groups); } catch (IllegalArgumentException iae) { throw iae; } catch (ValidationException ve) { throw ve; } return ViolationBuild.build(violations); }}
BaseService让自己的service继承此类
java不能多继承 所以如果已经继承了别的类，可以将此类注入出来
此类是为了拿到一个单例的ValidatorProvider
package com.alibaba.xianzhi.base.web;import javax.annotation.Resource;import javax.validation.Validator;import com.alibaba.xianzhi.validator.ValidatorProvider;/** * BaseService * @author: lizhilong * @date: 2017-11-15 11:41:24 */public abstract class BaseService { @Resource protected Validator validator; private ValidatorProvider validatorProvider; protected ValidatorProvider getValidatorProvider() { if (validatorProvider == null) { validatorProvider = new ValidatorProvider(validator); } return validatorProvider; }}
所需校验的实体类
说明：Constants为接口常量
@Getter@AllArgsConstructorpublic class SubmitVO extends BaseVO { @NotNull(message="厂商不能为空") private Long companyId; @Length(min=0, max=100, message="标题请控制在" + Constants.MAX_TITLE + "个字符以内") @NotNull(message="标题不能为空") private String title; @Length(min=0, max=65535, message="修复方案长度不能超过" + Constants.MAX_FIX_ADVICE) @NotNull(message="修复方案不能为空") private String fixAdvice;}
下面就是如何使用
public BaseResponse save(SubmitVO submitVO ) {/** * getValidatorProvider()此方法是BaserService中， * 上面说到本人的service是继承此 * service的所以可以直接用 **/ValidatorProvider validatorProvider = getValidatorProvider();/** * validatorProvider调用validate（Object obj）进行校验 * 返回ViolationBuild **/ViolationBuild validateFlaw = validatorProvider.validate(submitVO);/** * 此时如果校验有失败的 容器中便会存储信息，ViolationBuild可以通过自己的 * getMessage方法获取信息（此方法可以自己封装成自己想要的样子） **/System.out.println(validateFlaw.getMessage()); }
打印结果：标题请控制在100个字符以内
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
回避现实的人，未来将更不理想。
