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Struts2的Action的搜索顺序
http://localhost:8080/path1/path2/student.action
1）判断package是否存在，如：/path1/path2
2）存在，判断action是否存在，没有，则报错
3）不存在，检查上一级路径的package是否存在（直到默认的namespace），重复第一步，没有，则报错
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>org.struts</groupId>
<artifactId>Struts2-ActionSearchOrder</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>Struts2-ActionSearchOrder Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<!-- 统一Struts2的开发环境 -->
<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-ActionSearchOrder</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"> <!-- 配置Struts2过滤器 --> <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.SearchAction.java
package org.struts.action;
import com.opensymphony.xwork2.ActionSupport;
public class SearchAction extends ActionSupport {
private static final long serialVersionUID = 1L;
public String search() 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="search1" extends="struts-default" namespace="/">
<action name="search" class="org.struts.action.SearchAction" method="search">
<result>/search.jsp</result>
</action>
<action name="CommonSearch" class="org.struts.action.SearchAction" method="search">
<result>/Common.jsp</result>
</action>
</package>
<package name="search2" extends="struts-default" namespace="/aa">
<action name="CommonSearch" class="org.struts.action.SearchAction" method="search">
<result>/aaCommon.jsp</result>
</action>
</package>
</struts>
6.aaCommon.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>This is aaCommon.jsp</title>
</head>
<body>
This is aaCommon.jsp
</body>
</html>
7.Common.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>This is Common.jsp</title>
</head>
<body>
This is Common.jsp
</body>
</html>
8.search.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>This is search.jsp</title>
</head>
<body>
This is search.jsp
</body>
</html>
9.效果预览
9.1 访问http://localhost:8080/Struts2-ActionSearchOrder/aa/CommonSearch.action，此时存在namespace="/aa"的package，搜索action，存在
9.2 访问http://localhost:8080/Struts2-ActionSearchOrder/aa/search.action，此时存在namespace="/aa"的package，搜索action，不存在，报错
9.3 访问http://localhost:8080/Struts2-ActionSearchOrder/aa/bb/CommonSearch.action，不存在namespace="/aa/bb"的package，搜索上一级路径的package，此时存在namespace="/aa"的package，搜索action，存在
9.4 访问http://localhost:8080/Struts2-ActionSearchOrder/CommonSearch.action，存在namespace="/"的package，搜索action，存在
9.5 访问http://localhost:8080/Struts2-ActionSearchOrder/search.action，存在namespace="/"的package，搜索action，存在
参考：http://www.imooc.com/video/8998