/**
* <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;
}
}
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