Struts2学习六----------默认Action

时间：2025-01-24 17:36:20

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默认Action

　　- 当访问action不存在时，可通过指定默认action的方式避免出现错误代码页面

　　- 使用default-action-ref指定默认action

实例

1.项目结构

Struts2学习六----------默认Action

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>org.struts</groupId>

	<artifactId>Struts2-DefaultAction</artifactId>

	<packaging>war</packaging>

	<version>0.0.1-SNAPSHOT</version>

	<name>Struts2-DefaultAction Maven Webapp</name>

	<url>http://maven.apache.org</url>

	<properties>

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

		<struts.version>2.5.10</struts.version>

	</properties>

	<dependencies>

		<!-- junit -->

		<dependency>

			<groupId>junit</groupId>

			<artifactId>junit</artifactId>

			<version>4.12</version>

			<scope>test</scope>

		</dependency>

		<!-- struts2 -->

		<dependency>

		    <groupId>org.apache.struts</groupId>

		    <artifactId>struts2-core</artifactId>

		    <version>${struts.version}</version>

		</dependency>

	</dependencies>

	<build>

		<finalName>Struts2-DefaultAction</finalName>

	</build>

</project>

3.web.xml

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

<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">

	<filter>

		<filter-name>struts</filter-name>

		<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>

	</filter>

	<filter-mapping>

		<filter-name>struts</filter-name>

		<url-pattern>/*</url-pattern>

	</filter-mapping>

</web-app>

4.HelloAction.java

package org.struts.action;

import com.opensymphony.xwork2.ActionSupport;

public class HelloAction extends ActionSupport {

	private static final long serialVersionUID = 1L;

	@Override

	public String execute() throws Exception {

		return SUCCESS;

	}

}

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="hello" extends="struts-default" namespace="/">

		<!-- 默认action -->

		<default-action-ref name="404"/>

		<action name="404">

			<result>/404.jsp</result>

		</action>

		<action name="hello" class="org.struts.action.HelloAction">

			<result>/success.jsp</result>

		</action>

	</package>

</struts>

6.success.jsp

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

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>success.jsp</title>

</head>

<body>

	您好！欢迎访问success.jsp

</body>

</html>

7.404.jsp

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

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>404</title>

</head>

<body>

	不好啦！您访问的页面不存在了.

</body>

</html>

8.效果预览

　　8.1 访问存在的action

　　Struts2学习六----------默认Action

　　8.2 访问不存在的action

　　Struts2学习六----------默认Action

参考：http://www.imooc.com/video/9001

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