Struts2进阶学习4

自定义拦截器的使用

核心配置文件

<?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>

    <package name="index" namespace="/" extends="struts-default" >

        <interceptors>

            <!-- 注册拦截器 -->

            <interceptor name="myInter3" class="com.struts2.interceptor.MyInterceptor3"/>

            <!-- 注册拦截器栈 -->

            <interceptor-stack name="myStack">

                <!-- 自定义拦截器在默认之前(方便后面的拦截器对前面的也进行处理) -->

                <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>

                <!-- 引入struts2自带的20个拦截器 -->

                <interceptor-ref name="defaultStack"/>

            </interceptor-stack>

        </interceptors>

        <!-- 指定默认拦截器 -->

        <default-interceptor-ref name="myStack"/>

        <action name="IndexAction_*" class="com.struts2.action.IndexAction" method="{1}" >

            <result name="success" type="dispatcher" >/index.jsp</result>

        </action>

    </package>

    <package name="tag" namespace="/" extends="struts-default">

        <action name="DemoAction" class="com.struts2.action.DemoAction" method="page" >

            <result name="success" type="dispatcher" >/tag.jsp</result>

        </action>

    </package>

</struts>

struts.xml

自定义拦截器的3种方式

package com.struts2.interceptor;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.Interceptor;

/**

 * @author: 肖德子裕

 * @date: 2018/11/21 15:48

 * @description: 自定义拦截器1

 * 拦截器生命周期：随项目启动而创建，随项目关闭而销毁

 */

public class MyInterceptor implements Interceptor {

    @Override

    public void init() {

    }

    @Override

    public String intercept(ActionInvocation actionInvocation) throws Exception {

        return null;

    }

    @Override

    public void destroy() {

    }

}

(1)

package com.struts2.interceptor;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

import com.opensymphony.xwork2.interceptor.Interceptor;

/**

 * @author: 肖德子裕

 * @date: 2018/11/21 15:48

 * @description: 自定义拦截器2

 */

public class MyInterceptor2 extends AbstractInterceptor {

    @Override

    public String intercept(ActionInvocation actionInvocation) throws Exception {

        return null;

    }

}

(2)

package com.struts2.interceptor;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;

/**

 * @author: 肖德子裕

 * @date: 2018/11/21 15:48

 * @description: 自定义拦截器3

 * MethodFilterInterceptor:方法过滤拦截器

 */

public class MyInterceptor3 extends MethodFilterInterceptor {

    @Override

    protected String doIntercept(ActionInvocation actionInvocation) throws Exception {

        //前处理

        System.out.println("before>>>");

        //放行

        actionInvocation.invoke();

        //后处理

        System.out.println("after>>>");

        //跳转到成功页面

        return "success";

    }

}

(3)

测试拦截器

package com.struts2.action;

import com.opensymphony.xwork2.ActionSupport;

/**

 * @author: 肖德子裕

 * @date: 2018/11/21 15:45

 * @description: 测试拦截器的使用

 */

public class IndexAction extends ActionSupport {

    public String add(){

        System.out.println("添加用户!");

        return "success";

    }

    public String delete(){

        System.out.println("删除用户!");

        return "success";

    }

    public String update(){

        System.out.println("修改用户!");

        return "success";

    }

    public String find(){

        System.out.println("查找用户!");

        return "success";

    }

}

IndexAction

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<h2>I Love China</h2>

</body>

</html>

index.jsp

测试struts2标签的使用（了解）

package com.struts2.action;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

import java.util.ArrayList;

import java.util.List;

/**

 * @author: 肖德子裕

 * @date: 2018/11/21 19:34

 * @description: 测试struts2标签的使用

 */

public class DemoAction extends ActionSupport {

    public String page(){

        List<String> list=new ArrayList<>();

        list.add("xdzy");

        list.add("xdzy");

        list.add("xdzy");

        list.add("xdzy");

        ActionContext.getContext().put("list",list);

        return SUCCESS;

    }

}

DemoAction

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<%@ taglib prefix="s" uri="/struts-tags" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

<!-- 循环遍历 -->

<s:iterator value="#list">

    <s:property/><br>

</s:iterator>

<hr>

<s:iterator value="#list" var="name">

    <s:property value="#name"/><br>

</s:iterator>

<hr>

<s:iterator begin="1" end="100" step="1">

    <s:property/>|

</s:iterator>

<!-- if,else -->

<s:if test="#list.size()==4">

    list长度为4

</s:if>

<s:elseif test="#list.size()==3">

    list长度为3

</s:elseif>

<s:else>

    默认为0

</s:else>

</body>

</html>

tag.jsp

巴特西

Struts2进阶学习4

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