SpringMVC集成Hibernate Validator进行参数校验

1、JSR303

 JSR303是java为Bean数据合法性校验所提供的标准框架，它已经包含在java EE6.0中。JSR303通过在Bean属性上标注类似于@NotNull、@Max等标准的注解指定校验规则，并通过标准的验证接口对Bean进行验证。



Hibernate Validator是JSR303的一个参考实现，除支持所有标准的校验注解外，它还支持扩展注解。



2、Spring校验框架

 Spring3.0拥有自己独立的数据校验框架，同时支持JSR303标准的校验框架。Spring的DataBinder在进行数据绑定时，可同时调用校验框架完成数据校验工作。

 Spring的org.springframework.validator是校验框架所在的包，LocalValidatorFactoryBean既实现了Spring的Validator接口，也实现了JSR 303的Validator接口。只要在Spring容器中定义一个LocalValidatorFactoryBean，即可将其注入到需要数据校验的Bean中。

<mvc:annotation-driven validator="validator"/>
<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
<property name="providerClass" value="org.hibernate.validator.HibernateValidator"/>
</bean> Spring本身没有提供JSR303的实现，所以必须将JSR303的实现者（如Hibernate
Validator）的jar文件放到类路径下，Spring将其自动加载并装配好JSR 303的实现者。

3、SpringMVC数据校验

 <mvc:annotation-driven />默认的会装配好一个LocalValidatorFactoryBean，通过在方法参数上标注@Valid注解即可让Spring
MVC在完成数据绑定后执行数据校验的工作，例：

首先在bean上注解规则

public class AccountParam {
@NotBlank(message = "{username}")
private String username;
@NotBlank(message = "{passwd}")
private String passwd;
@NotNull
@Pattern(regexp = ".*(?=.*\\d)(?=.*[a-zA-Z])(?=.*[~!@#$%^&*_]).{8,}")
private String newpasswd;
@NotBlank(message = "{confirmpasswd}")
private String confirmpasswd;
}
在Controller中对方法参数注解声明校验

/修改密码
@RequestMapping(value = "/update-account", method = RequestMethod.POST)
@ResponseBody
public AjaxResult updateUserPasswd(HttpServletRequest request, @Valid AccountParam accountParam, BindingResult bindingResult) {
logger.info("AccountController updateUserPasswd:/update-account?param={}", accountParam.toString());
if (bindingResult.hasErrors()) {
return AjaxResult.errorParam();
}
}

需要校验的表单/命令对象和其绑定结果对象或错误对象是成对出现的，他们之间不允许声明其他的入参。

4、组校验

 有的时候，我们对一个实体类需要有多种验证方式，在不同的情况下使用不同的验证方式，比如说对于网络配置来说，静态地址配置方式需要我们队ip、子网掩码、网段等格式进行校验，而DHCP时不需要输入这些。当一个Bean需要不同的校验规则时就需要分组。

首先定义两个组

public interface DhcpGroup {
}
public interface StaticGroup {
}
在实体类由组区分不同的规则

public class NetworkParam {
@NotBlank
private String eth;
@NotNull(groups = {StaticGroup.class,DhcpGroup.class})
@Pattern(regexp = "^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$", groups = StaticGroup.class)
private String ip;
@NotNull(groups = {StaticGroup.class,DhcpGroup.class})
@Pattern(regexp = "^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$", groups = StaticGroup.class)
private String netmask;
@NotNull(groups = {StaticGroup.class,DhcpGroup.class})
@Pattern(regexp = "^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$", groups = StaticGroup.class)
private String gateway;
@NotNull(groups = {StaticGroup.class,DhcpGroup.class})
@Pattern(regexp = "^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$", groups = StaticGroup.class)
private String dns1;
@NotNull(groups = {StaticGroup.class,DhcpGroup.class})
@Pattern(regexp = "^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5]|[*])$", groups = StaticGroup.class)
private String dns2;
@NotNull(groups = {StaticGroup.class,DhcpGroup.class})
private Integer isDhcp;
}

在Controller中指定组来对不同的情况进行校验。

//静态配置网络
@RequestMapping(value = "/set-netconfig-static", method = RequestMethod.POST)
@ResponseBody
public AjaxResult setNetconfigStatic(HttpServletRequest request, @Validated({StaticGroup.class}) NetworkParam networkParam, BindingResult bindingResult) throws IOException {
logger.info("NetconfigController setNetConfigStatic:/set-netconfig-static?params={}", networkParam.toString());
if (bindingResult.hasErrors()) {
return AjaxResult.errorParam();
}
}

//DHCP配置网络
@RequestMapping(value = "/set-netconfig-dhcp", method = RequestMethod.POST)
@ResponseBody
public AjaxResult setNetconfigDhcp(HttpServletRequest request, @Validated({DhcpGroup.class}) NetworkParam networkParam, BindingResult bindingResult) throws IOException {
logger.info("NetconfigController setNetConfigDhcp:/set-netconfig-dhcp?params={}", networkParam.toString());
if (bindingResult.hasErrors()) {
return AjaxResult.errorParam();
}
}

控制组的校验顺序

 @GroupSequence({Group1.class,Group2.class,User.class})来控制校验顺序,即先校验group1再校验group2

参考：
https://www.jianshu.com/p/fc6c20af759a https://www.cnblogs.com/hujihon/p/5357481.html