原理：在新建页面中Session保存token随机码，当保存时验证，通过后删除，当再次点击保存时由于服务器端的Session中已经不存在了，所有无法验证通过。
1.新建注解：
/*** <p>* 防止重复提交注解，用于方法上<br/>* 在新建页面方法上，设置needSaveToken()为true，此时拦截器会在Session中保存一个token，* 同时需要在新建的页面中添加* <input type="hidden" name="token" value="${token}">* <br/>* 保存方法需要验证重复提交的，设置needRemoveToken为true* 此时会在拦截器中验证是否重复提交* </p>* @author: chuanli* @date: -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. 新建拦截器
/*** <p>* 防止重复提交过滤器* </p>** @author: chuanli* @date: -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. 在相关方法中加入注解：
@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.在新建页面中加入 <input type="hidden" name="token" value="${token}">
from:/mushui/blog/143397
