Struts2拦截器的应用

 拦截器类

package com.umgsai.txyl.interceptor;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
public class AdminInterceptor extends AbstractInterceptor {
    private static final long serialVersionUID = 1L;
    //管理员操作相关的拦截器
    @Override
    public String intercept(ActionInvocation invocation) throws Exception {
        String result = null;
        ActionContext actionContext = invocation.getInvocationContext();
        if((actionContext.getSession().get("admin")==null||"".equals(actionContext.getSession().get("admin")))){
            return "admin_login";
        }
        result = invocation.invoke();
        return result;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
    }
}

admin.xml中应用

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC  "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"  "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>

    <package name="admin" extends="struts-default">
        <interceptors>
            <interceptor name="AdminInterceptor" class="com.umgsai.txyl.interceptor.AdminInterceptor" />
            <!-- 定义拦截器栈 -->
            <interceptor-stack name="myStack"><!-- 引用自定义拦截器进行身份验证 -->
                <interceptor-ref name="defaultStack" />
                <interceptor-ref name="AdminInterceptor" />
            </interceptor-stack>
        </interceptors>
        <default-interceptor-ref name="myStack" /><!--拦截器引用 -->
        <global-results><!-- 全局结果转发 -->
            <result name="admin_login">/admin/login.jsp</result><!-- 管理员身份验证失败 -->
        </global-results>
        <action name="image_upload" class="com.umgsai.txyl.action.UploadAction" method="site_modify">
            <param name="allowTypes">image/bmp,image/png,image/gif,image/jpeg,image/pjpeg</param>
            <param name="savePath">/images</param>
            <result name="error">site_modify.jsp?site_id=${site_id}</result>
            <result name="success">site_modify.jsp?site_id=${site_id}</result>
        </action>
        <action name="admin_login" class="com.umgsai.txyl.action.AdminAction"
            method="execute">
            <interceptor-ref name="defaultStack"/>
            <result name="admin_login_success">index.jsp</result><!-- //用户登录 -->
            <result name="admin_login_failed">login.jsp</result>
        </action>
    </package>
</struts>