spring mvc使用注解后的校验和绑定处理

spring mvc使用注解后，依然可以使用自带的Validator接口。比如这样一个Validator实现：

  

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   @Component(
   "
   productValidator
   "
   ) 
   public
    
   class
    ProductValidator 
   implements
    Validator { @SuppressWarnings(
   "
   unchecked
   "
   ) @Override 
   public
    
   boolean
    supports(Class clazz) { 
   return
    Product.
   class
   .isAssignableFrom(clazz); } @Override 
   public
    
   void
    validate(Object object, Errors errors) { ValidationUtils.rejectIfEmpty(errors, 
   "
   name
   "
   ,
   "
   field.required
   "
   ); }

  

 

在Controller中通过注解获取：

  

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    @Resource(name 
   =
    
   "
   productValidator
   "
   ) 
   private
    Validator validator; ... @RequestMapping(
   "
   /save.htm
   "
   ) 
   public
    ModelAndView save(Product product, BindingResult result) { 
   this
   .validator.validate(product, result); 
   if
    (result.hasErrors()) { 
   return
    
   new
    ModelAndView(
   "
   input
   "
   ); } ...

  

如果是绑定相关的，比如只是检查不能为空，可以用下面方式替代，在Controller中增加：

  

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    @InitBinder 
   public
    
   void
    initDataBinding(WebDataBinder binder) { binder.setRequiredFields(
   new
    String[] { 
   "
   name
   "
    }); }

  

在错误信息的属性文件中增加：

required={0}不能为空
product.name=名称

上述两种方式使用共同的属性文件配置方法，在spring的配置文件中：

  

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   <
   bean 
   id
   ="messageSource"
    class
   ="org.springframework.context.support.ResourceBundleMessageSource"
   >
    
   <
   property 
   name
   ="basenames"
   >
    
   <
   list
   >
    
   <
   value
   >
   errors
   </
   value
   >
    
   </
   list
   >
    
   </
   property
   >
    
   </
   bean
   >

  

在jsp页面中通过spring的form标签显示：

 

  

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   <%
   @ taglib prefix
   =
   "
   form
   "
    uri
   =
   "
   http://www.springframework.org/tags/form
   "
    
   %>
    ...... 
   <%
   @ taglib prefix
   =
   "
   form
   "
    uri
   =
   "
   http://www.springframework.org/tags/form
   "
    
   %>
    ......

  

另外，如果InitBinder注解不加参数，将检查所有控制器方法调用的入参，可能有些类型入参不需要检查，这时可以：

  

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   @InitBinder(
   "
   product
   "
   ) 
   public
    
   void
    initDataBinding(WebDataBinder binder) { binder.setRequiredFields(
   new
    String[] { 
   "
   name
   "
    }); }