Tomcat struts2中的ClearCacheInterceptor

在我的web应用程序中，我希望包含

ClearCacheInterceptor

，这样在执行注销操作后，它应该清除捕获，这样，如果用户单击“上一步”按钮，它就不会显示上一页。当我运行代码时，它工作正常，我可以登录执行其他操作，但当我单击“注销”时，它显示错误。这是我的密码

public class ClearCacheInterceptor  extends AbstractInterceptor{

/**
 *
 */
private static final long serialVersionUID = 1L;

@Override

public String intercept(ActionInvocation invocation) throws Exception {

    ActionContext context=(ActionContext)invocation.getInvocationContext();

    HttpServletResponse response=(HttpServletResponse)context.get(StrutsStatics.HTTP_RESPONSE);

    response.setHeader("Cache-Control", "no-cache");

    response.setHeader("Pragma", "no-cache");

    response.setDateHeader("Expires", 0);

    String result=invocation.invoke();

    System.out.println("check result="+result);

    return result;

}

}

注销代码

  public String logOut() {
    String status = "";
     if (true) {
        session.clear();
        session = null;
        if (session instanceof org.apache.struts2.dispatcher.SessionMap) {
            try {
                ((org.apache.struts2.dispatcher.SessionMap) session).invalidate();
            } catch (IllegalStateException e) {
            }
        }
        status = "success";
    } else {
        addActionError(getText("system.ERROR"));
        status = "error";
    }

    return status;
}  

我的struts.xml操作文件

       <struts>
<!-- Configuration for the default package. -->
<constant name="struts.Devmode" value="false"></constant>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.custom.i18n.resources" value="ApplicationResources" />
<package name="default" extends="struts-default">
    <interceptors>
        <interceptor-stack name="defaultStack">
            <interceptor-ref name="exception" />
            <interceptor-ref name="alias" />
            <interceptor-ref name="servletConfig" />
            <interceptor-ref name="prepare" />
            <interceptor-ref name="i18n" />
            <interceptor-ref name="chain" />
            <interceptor-ref name="debugging" />
            <interceptor-ref name="profiling" />
            <interceptor-ref name="scopedModelDriven" />
            <interceptor-ref name="modelDriven" />
            <interceptor-ref name="fileUpload" />
            <interceptor-ref name="checkbox" />
            <interceptor-ref name="staticParams" />
            <interceptor-ref name="params">
                <param name="excludeParams">dojo..*,d-..*,6..*</param>
            </interceptor-ref>
            <interceptor-ref name="conversionError" />
            <interceptor-ref name="validation">
                <param name="excludeMethods">input,back,cancel,browse</param>
            </interceptor-ref>
            <interceptor-ref name="workflow">
                <param name="excludeMethods">input,back,cancel,browse</param>
            </interceptor-ref>
        </interceptor-stack>
        <interceptor name="clear-cache"  class="com.java.session.ClearCacheInterceptor" />
    </interceptors>
    <default-interceptor-ref name="defaultStack"/>

    <action name="users">
        <result>home.jsp </result>
    </action>
    <action name="UserAction" class="com.java.action.RegisterAction">
        <result name="input">/signup.jsp</result>
        <result name="success">/home.jsp</result>
        <result name="error">/error.jsp</result>
    </action>
    <action name="trialregister">
        <result>signup.jsp</result>
    </action>
    <action name="Activate" class="com.java.action.ActivationAction">
        <result name="input">/error.jsp</result>
        <result name="success">/home.jsp</result>
        <result name="error">/test1.jsp</result>
    </action>
    <action name="verifyLogin" class="com.java.action.LoginAction" method="verifyLogin">
         <result name="input">/home.jsp</result>
        <result name="success">/test1.jsp</result>
    </action>

    <action name="logOut" class="com.java.action.LoginAction" method="logOut">
        <interceptor-ref name="clear-cache"/>
        <result name="error">/error.jsp</result>
        <result name="success">/logout.jsp</result>
    </action>

    <action name="Back">
    <result>/index.jsp</result>    
    </action>

    <action name="Reroot">
    <result>/index.jsp</result>    
    </action>

</package>

---

请在注销方法中更改您的实现。您正在调用

session.clear();

然后设置为null。如果在

session.clear(); 

---

然后，它意味着当代码到达这里时，clear会调用某些地方，或者没有创建会话。还有一件事，您正在验证instanceof会话后检查=null；始终为空。

是否在线路会话中抛出错误。清除（）？我们不知道103行是哪一行。。。另外，在

if（true）

块中使用

else

有什么意义？

session.clear();