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Struts2学习六----------默认Action

2024-09-23 04:53:15   214人阅读

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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

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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

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　　8.2 访问不存在的action

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参考：http://www.imooc.com/video/9001

Struts2学习六----------默认Action


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