Spring MVC攔截器+註解方式實現防止表單重複提交

原理：在新建頁面中Session保存token隨機碼，當保存時驗證，經過後刪除，當再次點擊保存時因爲服務器端的Session中已經不存在了，全部沒法驗證經過。

註解Token代碼：

@Target(ElementType.METHOD)

@Retention (RetentionPolicy.RUNTIME)

public @interface Token {

 

     boolean save() default false ;

 

     boolean remove() default false ;

}

攔截器TokenInterceptor代碼：

public class TokenInterceptor extends HandlerInterceptorAdapter {

 

     @Override

     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

         if (handler instanceof HandlerMethod) {

             HandlerMethod handlerMethod = (HandlerMethod) handler;

             Method method = handlerMethod.getMethod();

             Token annotation = method.getAnnotation(Token. class );

             if (annotation != null ) {

                 boolean needSaveSession = annotation.save();

                 if (needSaveSession) {

                     request.getSession( false ).setAttribute( "token" , UUID.randomUUID().toString());

                 }

                 boolean needRemoveSession = annotation.remove();

                 if (needRemoveSession) {

                     if (isRepeatSubmit(request)) {

                         return false ;

                     }

                     request.getSession( false ).removeAttribute( "token" );

                 }

             }

             return true ;

         } else {

             return super .preHandle(request, response, handler);

         }

     }

 

     private boolean isRepeatSubmit(HttpServletRequest request) {

         String serverToken = (String) request.getSession( false ).getAttribute( "token" );

         if (serverToken == null ) {

             return true ;

         }

         String clinetToken = request.getParameter( "token" );

         if (clinetToken == null ) {

             return true ;

         }

         if (!serverToken.equals(clinetToken)) {

             return true ;

         }

         return false ;

     }

}

而後在Spring MVC的配置文件里加入：

<!-- 攔截器配置 -->

< mvc:interceptors >

     <!-- 配置Shiro攔截器，實現註冊用戶的注入 -->

     < mvc:interceptor >

         < mvc:mapping path = "/**" />

         < bean class = "com.storezhang.video.shiro.ShiroInterceptor" />

     </ mvc:interceptor >

     <!-- 配置Token攔截器，防止用戶重複提交數據 -->

     < mvc:interceptor >

         < mvc:mapping path = "/**" />

         < bean class = "com.storezhang.web.spring.TokenInterceptor" />

     </ mvc:interceptor >

</ mvc:interceptors >

相關代碼已經註釋，相信你能看懂。
關於這個方法的用法是：在須要生成token的controller上增長@Token(save=true)，而在須要檢查重複提交的controller上添加@Token(remove=true)就能夠了。
另外，你須要在view裏在form裏增長下面代碼：

<     input     type     =     "hidden"     name     =     "token"     value     =     "${token}"     />

已經完成了，去試試看你的數據還能重複提交了吧。