清除缓存拦截器struts2不工作

Question

我写了一个拦截器来防止缓存但页面仍然缓存。

拦截：

public class ClearCacheInterceptor implements Interceptor { 
    public String intercept(ActionInvocation invocation)throws Exception{ 
     String result = invocation.invoke(); 

     ActionContext context = (ActionContext) invocation.getInvocationContext(); 
     HttpServletRequest request = (HttpServletRequest) context.get(StrutsStatics.HTTP_REQUEST); 
     HttpServletResponse response=(HttpServletResponse) context.get(StrutsStatics.HTTP_RESPONSE); 

     response.setHeader("Cache-Control", "no-store"); 
     response.setHeader("Pragma", "no-cache"); 
     response.setDateHeader("Expires", 0); 

     return result; 
    } 

    public void destroy() {} 
    public void init() {} 
} 

struts.xml的

<struts> 
    <constant name="struts.devMode" value="true"/> 
    <constant name="struts.enable.DynamicMethodInvocation" value="false" /> 

    <package name="default" extends="struts-default"> 
    <interceptors> 
     <interceptor name="caching" class="com.struts.device.interceptor.ClearCacheInterceptor"/> 
     <interceptor-stack name="cachingStack">  
     <interceptor-ref name="caching" />  
     <interceptor-ref name="defaultStack" />  
     </interceptor-stack> 
    </interceptors> 

    <action name="Login" class="struts.device.example.LogIn"> 
     <interceptor-ref name="cachingStack"/> 
     <result>example/Add.jsp</result> 
     <result name="error">example/Login.jsp</result> 
    </action> 
    </package> 
</struts> 

应用正常工作;它执行拦截器，但不防止缓存。

Answer 1

我已经解决了我的问题。感谢帮助我追踪的开发人员工具。

在我的代码略有序列改变帮了我：按the Struts 2 interceptor docs结果之前invocation.invoke()回报呈现。在结果返回给客户端之前设置标题会在返回的结果中设置标题。

即

public String intercept(ActionInvocation invocation)throws Exception{ 
    HttpServletResponse response = ServletActionContext.getResponse(); 

    response.setHeader("Cache-Control", "no-store"); 
    response.setHeader("Pragma", "no-cache"); 
    response.setDateHeader("Expires", 0); 

    return invocation.invoke(); 
}