Spring MVC表单防重复提交

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

public class TokenInterceptor extends HandlerInterceptorAdapter {
    private Logger logger = Logger.getLogger(TokenInterceptor.class);
    private static final String TOKEN = "token";
    @Override
    public 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();
                // 创建token
                boolean create = annotation.create();
                if (create) {
                    session.setAttribute(TOKEN, UUID.randomUUID().toString());
                    return true;
                }
                // 删除token
                boolean remove = annotation.remove();
                if (remove) {
                    if (isRepeatSubmit(request)) {
                        logger.warn("表单不能重复提交:" + 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;
    }
}

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

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