struts防止重复提交

1、struts配置文件，添加拦截器TokenInterceptor

<package name="business" namespace="/business" extends="default">

<interceptors>

<interceptor name="tokenInterceptor"

class="com.imchooser.infoms.action.sys.TokenInterceptor">

</interceptor>

</interceptors>

<action name="*-save" class="{1}Action" method="save">

<result name="*">/WEB-INF/view/jsp/{1}/entity.jsp</result>

<interceptor-ref name="paramsPrepareParamsStack"/>  

<interceptor-ref name="tokenInterceptor"/>  

<result name="tokenerror">/WEB-INF/view/jsp/{1}/entity.jsp</result>

</action>

</package>

2、拦截器TokenInterceptor

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import org.apache.commons.lang.StringUtils;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.Action;  

import com.opensymphony.xwork2.ActionInvocation;  

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;  

public class TokenInterceptor extends AbstractInterceptor {

public String intercept(ActionInvocation invocation) throws Exception {  

HttpServletRequest request = ServletActionContext.getRequest();

if(request==null){

return Action.LOGIN;

}

HttpSession session = request.getSession();

if(session==null){

return Action.LOGIN;

}

synchronized(session){

       String token = request.getParameter("struts.token");

       String session_token = (String) session.getAttribute("session_token");

       if (StringUtils.isBlank(token) || StringUtils.isBlank(session_token) || !token.equals(session_token)) {  

           session.setAttribute("session_token", token);

           return invocation.invoke();//通过  

       }  

}

       return "tokenerror"; //不通过，重复提交

   }  

}

3、在页面form表单中加上面代码

<s:token></s:token>