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。
- 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: 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;}
- 新建拦截器
/** * <p> * 防止重复提交过滤器 * </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); @Override public 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; }}
- 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>
- 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}">
