Struts2拦截器的应用

 拦截器类

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>