<struts>    <constant name="struts.devMode" value=http://www.mamicode.com/"true" /><!-- 开发者模式-->    <constant name="struts.multipart.maxSize" value=http://www.mamicode.com/"50000000" /><!--设置最大上传限制，默认不超过2m（具体不清楚）-->    <package name="test" extends="struts-default" namespace="/">                     <!-- 定义一个拦截器 -->          <interceptors>              <interceptor name="authority"    class="com.zzbj.util.LoginInterceptor">              </interceptor>              <!-- 拦截器栈 -->              <interceptor-stack name="mydefault">                  <interceptor-ref name="defaultStack" />                 <interceptor-ref name="authority" />              </interceptor-stack>          </interceptors>                <default-interceptor-ref name="mydefault"/> <!--定义为默认拦截器，全局拦截，也可以针对action 定义拦截器-->              <!-- 定义全局Result -->          <global-results>              <!-- 当返回login视图名时，转入/login.jsp页面 -->              <result name="login">/index.jsp</result>            <!--后面三个是捕获action throws Exception-->
            <result name="sql">/Error.jsp</result>            <result name="invalidinput">/Error.jsp</result>            <result name="naming">/Error.jsp</result>        </global-results>        <global-exception-mappings>            <exception-mapping result="sql" exception="java.sql.SQLException"></exception-mapping>            <exception-mapping result="invalidinput"                exception="cn.codeplus.exception.InvalidInputException"></exception-mapping>            <exception-mapping result="naming"            exception="javax.naming.NamingException"></exception-mapping>        </global-exception-mappings>                <action name="user_*" class="com.zzbj.action.UserAction"            method="{1}">            <result>/UserManage.jsp</result>        </action>    </package></struts> 

 1 public class LoginInterceptor extends AbstractInterceptor {    2     @Override   3     public String intercept(ActionInvocation invocation) throws Exception {   4         System.out.println("映射"); 5         // 取得请求相关的ActionContext实例   6         ActionContext ctx = invocation.getInvocationContext();   7         Map session = ctx.getSession();   8         String userRule = (String) session.get("RULE");   9         // 如果没有登陆，或者权限rule首位不为1（没有该类权限），都返回重新登陆  10         if (userRule != null && userRule.charAt(0)==‘1‘) {  11             System.out.println("已登录");  12             return invocation.invoke();  13         }  14         ctx.put("return", "你还没有登录");  15         return Action.LOGIN;  16     }    17 }