原理：在新建頁面中Session保存token隨機碼，當保存時驗證，通過后刪除，當再次點擊保存時由于服務器端的Session中已經不存在了，所有無法驗證通過。

1.新建注解：

/*** <p>* 防止重復提交注解，用于方法上<br/>* 在新建頁面方法上，設置needSaveToken()為true，此時攔截器會在Session中保存一個token，* 同時需要在新建的頁面中添加* <input type="hidden" name="token" value="${token}">* <br/>* 保存方法需要驗證重復提交的，設置needRemoveToken為true* 此時會在攔截器中驗證是否重復提交* </p>* @author: chuanli* @date: 2013-6-27上午11:14:02**/ @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) public @interface AvoidDuplicateSubmission {boolean needSaveToken() default false;boolean needRemoveToken() default false; }

2. 新建攔截器

/*** <p>* 防止重復提交過濾器* </p>** @author: chuanli* @date: 2013-6-27上午11:19:05*/ public class AvoidDuplicateSubmissionInterceptor extends HandlerInterceptorAdapter {private static final Logger LOG = Logger.getLogger(AvoidDuplicateSubmissionInterceptor.class);@Overridepublic boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler) throws Exception {User user = UserUtil.getUser();if (user != null) {HandlerMethod handlerMethod = (HandlerMethod) handler;Method method = handlerMethod.getMethod();AvoidDuplicateSubmission annotation = method.getAnnotation(AvoidDuplicateSubmission.class);if (annotation != null) {boolean needSaveSession = annotation.needSaveToken();if (needSaveSession) {request.getSession(false).setAttribute("token", TokenProcessor.getInstance().generateToken());}boolean needRemoveSession = annotation.needRemoveToken();if (needRemoveSession) {if (isRepeatSubmit(request)) {LOG.warn("please don't repeat submit,[user:" + user.getUsername() + ",url:"+ request.getServletPath() + "]");return false;}request.getSession(false).removeAttribute("token");}}}return true;}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;}}

3. 在Spring中配置

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"><property name="interceptors"><list><bean class="com.sohu.tv.crm.aop.UserLogInterceptor"/><bean class="com.sohu.tv.crm.aop.AvoidDuplicateSubmissionInterceptor"/></list></property></bean>

4. 在相關方法中加入注解：

@RequestMapping("/save")@AvoidDuplicateSubmission(needRemoveToken = true)public synchronized ModelAndView save(ExecutionUnit unit, HttpServletRequest request, HttpServletResponse response)throws Exception {@RequestMapping("/edit")@AvoidDuplicateSubmission(needSaveToken = true)public ModelAndView edit(Integer id, HttpServletRequest request) throws Exception {

5.在新建頁面中加入 <input type="hidden" name="token" value="${token}">
from:?https://my.oschina.net/mushui/blog/143397

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