spring mvc防止表单重复提交的代码片段

1.定义一个token接口

 package com.bigbigrain.token;

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

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

     boolean remove() default false;
 }

2.实现拦截器

 package com.bigbigrain.token;

 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) {
                 boolean needSaveSession = annotation.save();
                 if (needSaveSession) {
                     request.getSession(true).setAttribute("token", UUID.randomUUID().toString());
                 }
                 boolean needRemoveSession = annotation.remove();
                 if (needRemoveSession) {
                     if (isRepeatSubmit(request)) {
                          LOG.warn("please don't repeat submit,url:"+ request.getServletPath());
                         return false;
                     }
                     request.getSession(true).removeAttribute("token");
                 }
             }
             return true;
         } else {
             return super.preHandle(request, response, handler);
         }
     }

     private boolean isRepeatSubmit(HttpServletRequest request) {
         String serverToken = (String) request.getSession(true).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;
     }
 }

3.配置文件配置

 ~<!-- 拦截器配置 -->
 <mvc:interceptors>
         <!-- 配置Token拦截器，防止用户重复提交数据 -->
         <mvc:interceptor>
             <mvc:mapping path="/**"/><!--这个地方时你要拦截得路径 我这个意思是拦截所有得URL-->
             <bean class="com.dinfo.interceptor.TokenInterceptor"/><!--class文件路径改成你自己写得拦截器路径！！ -->
         </mvc:interceptor>
 </mvc:interceptors>

4.在跳转需要生成token页面的controller的方法加上注解~@Token(save=true)；页面加上~<input type="hidden" name="token" value="${token}" />；在页面提交处理方法上加上~@Token(remove=true)注解

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