轉載自?Spring MVC表單防重復提交

利用Spring MVC的過濾器及token傳遞驗證來實現表單防重復提交。

創建注解

@Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface Token { ? ?boolean create() default false; ? ?boolean remove() default false; }

在跳轉頁面的方法上加上：@Token(create = true)\在提交的action方法上加上：@Token(remove = true)

創建過濾器

public class TokenInterceptor extends HandlerInterceptorAdapter { ? ?private Logger logger = Logger.getLogger(TokenInterceptor.class); ? ?private static final String TOKEN = "token"; ? ?@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handler) throws Exception {if (handler instanceof HandlerMethod) {Method method = ((HandlerMethod) handler).getMethod();Token annotation = method.getAnnotation(Token.class);if (annotation != null) {HttpSession session = request.getSession(); ? ? ? ? ? ? ? ?// 創建tokenboolean create = annotation.create();if (create) {session.setAttribute(TOKEN, UUID.randomUUID().toString());return true;} ? ? ? ? ? ? ? ?// 刪除tokenboolean remove = annotation.remove();if (remove) {if (isRepeatSubmit(request)) {logger.warn("表單不能重復提交:" + request.getRequestURL());return false;}session.removeAttribute(TOKEN);}}} else {return super.preHandle(request, response, handler);}return true;} ? ?private boolean isRepeatSubmit(HttpServletRequest request) {String token = (String) request.getSession().getAttribute(TOKEN);if (token == null) {return true;} ? ? ? ?String reqToken = request.getParameter(TOKEN);if (reqToken == null) {return true;} ? ? ? ?if (!token.equals(reqToken)) {return true;} ? ? ? ?return false;} }

配置攔截器

<!--配置攔截器 --> ? <mvc:interceptors> <mvc:interceptor> ?<mvc:mapping path="/**" /> <bean class="com.example.web.interceptor.TokenInterceptor"/> ? ?</mvc:interceptor> </mvc:interceptors>

表單添加token

<input type="hidden" id="token" name="token" value="$!{session.getAttribute('token')}"/>

在form表單里面添加token域，提交表單時需要傳過去。

總結

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