Struts2-lesson4

登陆练习

<interceptors>
    <!-- 注册拦截器 -->
    <interceptor name="loginInterceptor"
        class="cn.itheima.web.interceptor.LoginInterceptor"></interceptor>

    <!-- 注册拦截器栈 -->
    <interceptor-stack name="myStack">
        <interceptor-ref name="loginInterceptor">
            <param name="excludeMethods">login</param>
        </interceptor-ref>
        <interceptor-ref name="defaultStack"></interceptor-ref>
    </interceptor-stack>
    <!-- -->
</interceptors>
<!-- 指定包中的默认拦截器栈 -->
<default-interceptor-ref name="myStack"></default-interceptor-ref>

http://localhost:8080/test_struts2/login.jsp

自定义拦截器

(需要先登陆再进行case测试)

配置拦截器讲究书写格式/顺序

<package name="hello" namespace="/hello" extends="struts-default">
        <!-- -->
        <interceptors>
            <!-- 注册拦截器 -->
            <interceptor name="loginInterceptor"
                class="cn.itheima.web.interceptor.LoginInterceptor"></interceptor>
            <!-- 
            <interceptor name="myInter1"
                class="cn.itcast.a_interceptor.MyInterceptor"></interceptor>
            <interceptor name="myInter2"
                class="cn.itcast.a_interceptor.MyInterceptor2"></interceptor>
             -->
            <interceptor name="myInter3"
                class="cn.itcast.a_interceptor.MyInterceptor3"></interceptor>
            
            <!-- 注册拦截器栈   注意顺序 -->
            <interceptor-stack name="myStack">
            
                <!-- 自定义拦截器引入(建议放在20个拦截器之前) -->
                <interceptor-ref name="loginInterceptor">
                    <param name="excludeMethods">login</param>
                </interceptor-ref>
                <!-- 
                <interceptor-ref name="myInter1">
                    <param name="includeMethods">execute,add,delete</param>
                </interceptor-ref>
                <interceptor-ref name="myInter2">
                    <param name="includeMethods">execute,add,delete</param>
                </interceptor-ref>
                 -->
                
                <interceptor-ref name="myInter3">
                    <!-- 指定哪些方法不拦截 <param name="excludeMethods">add,delete</param> -->
                    <!-- 指定哪些方法需要拦截 -->
                    <param name="includeMethods">add,delete</param>
                </interceptor-ref>
                <interceptor-ref name="defaultStack"></interceptor-ref>
                
            </interceptor-stack>
            
        </interceptors>
        
        <!-- 指定包中的默认拦截器栈 -->
        <default-interceptor-ref name="myStack"></default-interceptor-ref>
        
        <!-- 定义全局结果集 练习中的case必须要登陆！ -->
        <global-results>
            <result name="toLogin" type="redirect">/login.jsp</result>
        </global-results>


        <global-exception-mappings>
            <!-- 如果出现java.lang.RuntimeException异常,就将跳转到名为error的结果 -->
            <exception-mapping result="error"
                exception="java.lang.RuntimeException"></exception-mapping>
        </global-exception-mappings>
        
                <!-- 第四课 -->
        <action name="UserAction_*" class="cn.itheima.web.action.UserAction"
            method="{1}">
            <result name="toHome" type="redirect">/index.htm</result>
            <result name="error">/login.jsp</result>
        </action>
        <action name="D4Demo1Action_*" class="cn.itcast.a_interceptor.D4Demo1Action"
            method="{1}">
            <!-- 为Action单独指定走哪个拦截器(栈) <interceptor-ref name="myStack"></interceptor-ref> -->
            <result name="success" type="dispatcher">/dx.jsp</result>
        </action>
    </package>

http://localhost:8080/test_struts2/hello/D4Demo1Action.action

http://localhost:8080/test_struts2/hello/D4Demo1Action_add.action

http://localhost:8080/test_struts2/hello/D4Demo1Action_update.action

(拦截器的意义，是拦截后端action请求进而在过程中做手脚的，区别过滤器与监听器)

Struts2标签

http://localhost:8080/test_struts2/D4Demo2Action.action

http://localhost:8080/test_struts2/tag2.jsp

http://localhost:8080/test_struts2/D4Demo3Action.action