第五篇——Struts2的默认Action

默认Action

1、当访问action不存在时，可以通过制定默认action的方式避免出现错误代码页面；

2、使用default-action-ref 指定默认 action。

项目实例

1、项目结构

2、pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.ray</groupId>
  <artifactId>struts2Test</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>struts2Test Maven Webapp</name>
  <url>http://maven.apache.org</url>

  <dependencies>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-core -->
    <dependency>
      <groupId>org.apache.struts</groupId>
      <artifactId>struts2-core</artifactId>
      <version>2.5.16</version>
    </dependency>

  </dependencies>

  <build>
    <finalName>struts2Test</finalName>
  </build>

</project>

3、web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0" metadata-complete="true">
  <display-name>Archetype Created Web Application</display-name>

  <!-- 过滤所有请求交给Struts2处理 -->
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>
      org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter
    </filter-class>
  </filter>

  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

</web-app>

4、HelloWorldAction.java

package com.ray.action;

import com.opensymphony.xwork2.ActionSupport;

/**
 * Created by Ray on 2018/3/26 0026.
 **/
public class HelloWorldAction extends ActionSupport {

    /**
    * @Author: Ray
    * @Date: 2018/3/26 0026
    * @Description: Struts2默认执行的方法
    * @Return: SUCCESS
    */
    @Override
    public String execute() throws Exception {
        return super.execute();
    }
}

5、struts.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
        "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>

    <package name="default" namespace="/" extends="struts-default">
        <!-- 默认action -->
        <default-action-ref name="404"/>
        <action name="404">
            <result>/404.jsp</result>
        </action>

        <action name="helloWorld" class="com.ray.action.HelloWorldAction">
            <result name="success">/success.jsp</result>
        </action>
    </package>

    <include file="second-struts.xml"/>
    <include file="third-struts.xml"/>
    <include file="fourth-struts.xml"/>
</struts>

6、404.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>404</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    不好啦！您访问的页面不存在了.
</body>
</html>

7、页面效果

7.1 访问存在的action

7.2 访问不存在的action

ok!

巴特西

第五篇——Struts2的默认Action

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