Struts2 自定義攔截器(方法攔截器)

struts2系統自帶了很多攔截器，有時需要我們自己定義，一般有兩種方式： 

    public interface Interceptor extends Serializable{  
         public void init();  
         public void destroy();  
         public String intercept(ActionInvocation invocation)();  
    }  

    invocation.invoke();表示該方法執行完后執行Action的execute()方法或者執行下一個攔截器  
    invocation.getAction(); 可以將該法強制轉換為Action的類類型  

三、方法攔截器:繼承MethodFilterInterceptor類,重寫doIntercept()方法

MethodFilerInterceptor實現方法過濾中用到的兩個參數

定義好自定義攔截器后，就要使用自定義攔截器，在struts.xml文檔中 

    <package....>  
         <interceptors>  
              <interceptor name="myinterceptor" class="....">  
              </interceptor>  
         </interceptors>  
    </package>  

    <action .....>  
         <result.....></result>  
         <interceptor-ref name="defaultStack"></interceptor-ref>  
         <interceptor-ref name="myinterceptor"></interceptor-ref>  
    </action>  

一下是例子:

MyMethodInterceptor

    public class MyMethodInterceptor extends MethodFilterInterceptor{  
        protected String doIntercept(ActionInvocation invocation) throws Exception {  
            // TODO Auto-generated method stub  
            System.out.println("進入MyMethodInterceptor方法攔截器!!!!!!!!!!!!!");  
            Map session = invocation.getInvocationContext().getSession();  
            String name = (String) session.get("uname");  
            if (name != null) {  
                return invocation.invoke();  
            }  
            return "input";  
        }  
    }  

    <?xml version="1.0" encoding="UTF-8" ?>  
    <!DOCTYPE struts PUBLIC  
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"  
        "http://struts.apache.org/dtds/struts-2.3.dtd">  

    <struts>  
    <constant name="struts.i18n.encoding" value="UTF-8"></constant>  
        <constant name="struts.enable.DynamicMethodInvocation" value="true"></constant>  
    <!-- <constant name="struts.action.extension" value="action,abc"></constant>-->  

        <package abstract="true" name="pk1" namespace="/" extends="struts-default"></package>  

        <package name="pk2" extends="pk1">  
            <interceptors>  
                <interceptor name="test1" class="org.interceptors.MyTimerInterceptor"/>  

                <interceptor name="method1" class="org.interceptors.MyMethodInterceptor">  
                    <param name="excludeMethods">login</param>  
                </interceptor>  

                <interceptor-stack name="myStack">  
                    <interceptor-ref name="defaultStack"></interceptor-ref>  
                    <interceptor-ref name="method1"></interceptor-ref>  
                    <interceptor-ref name="test1"></interceptor-ref>  

                </interceptor-stack>            
            </interceptors>  
    <!--     <default-interceptor-ref name="myStack"></default-interceptor-ref>-->  

            <action name="login_*_*" class="org.hzy.Actions.LoginAction" method="{1}">  
                <interceptor-ref name="myStack"></interceptor-ref>  
                <result name="success" type="chain">{2}</result>  
                <result name="input">index.jsp</result>  
                <result name="error">/WEB-INF/Jsp/error.jsp</result>  
            </action>  

            <action name="query_*" class="org.hzy.Actions.QueryAction" method="{1}">  
                <result>/WEB-INF/Jsp/show.jsp</result>  
            </action>  

            <action name="upload_*" class="org.hzy.Actions.FileUploadAction" method="{1}">  
                <result>/WEB-INF/Jsp/show.jsp</result>  
            </action>  
        </package>  
    </struts>