springMVC 防止表单重复提交（自定义注解+拦截器）

package com.iflytek.common.interceptor;

import java.lang.reflect.Method;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class TokenInterceptor extends HandlerInterceptorAdapter {

	private static final Logger LOG = Logger.getLogger(Token.class);

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		if (handler instanceof HandlerMethod) {
			HandlerMethod handlerMethod = (HandlerMethod) handler;
			Method method = handlerMethod.getMethod();
			Token annotation = method.getAnnotation(Token.class);
			if (annotation != null) {
				String key = annotation.key();
				boolean needSaveSession = annotation.save();
				if (needSaveSession) {
					request.getSession(true).setAttribute("token" + key, UUID.randomUUID().toString());
				}
				boolean needRemoveSession = annotation.remove();
				if (needRemoveSession) {
					if (isRepeatSubmit(request, key)) {
						LOG.warn("please don't repeat submit,url:" + request.getServletPath());
						return false;
					}
					request.getSession(true).removeAttribute("token" + key);
				}
			}
			return true;
		} else {
			return super.preHandle(request, response, handler);
		}
	}

	private boolean isRepeatSubmit(HttpServletRequest request, String key) {
		String serverToken = (String) request.getSession(true).getAttribute("token" + key);
		if (serverToken == null) {
			return true;
		}
		String clinetToken = request.getParameter("token" + key);
		if (clinetToken == null) {
			return true;
		}
		if (!serverToken.equals(clinetToken)) {
			return true;
		}
		return false;
	}
}

package com.iflytek.common.interceptor;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Token {
	
	boolean save() default false;
	
	String key() default "";
	
    boolean remove() default false;
}

@RequestMapping("/xzhf/toXshf.do")
	@Token(save=true,key="1")
	public String toHfJSP(……){

    }

    @RequestMapping("/xzhf/saveXzhf.do")
	@ResponseBody
	@Token(remove=true,key="1")
	public void saveZxhf(……){
        
    }