第二篇——Struts2的Action搜索顺序
Struts2的Action的搜索顺序:
地址:http://localhost:8080/path1/path2/student.action
1、判断package是否存在,例如:/path1/path2;
2、若存在,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(知道默认的namespace),重复第一步,没有则报错。
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、SearchAction.java
package com.ray.action;
import com.opensymphony.xwork2.ActionSupport;
/**
* Created by Ray on 2018/3/26 0026.
* 第二篇实例
**/
public class SearchAction extends ActionSupport{
public String search(){
return SUCCESS;
}
}
5、second-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="com.ray.action.SearchAction" method="search">
<result>/search.jsp</result>
</action>
<action name="CommonSearch" class="com.ray.action.SearchAction" method="search">
<result>/Common.jsp</result>
</action>
</package>
<package name="search2" extends="struts-default" namespace="/aa">
<action name="CommonSearch" class="com.ray.action.SearchAction" method="search">
<result>/aaCommon.jsp</result>
</action>
</package>
</struts>
6、struts.xml
include引入 > 后面会讲解
<?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">
<action name="helloWorld" class="com.ray.action.HelloWorldAction">
<result name="success">/success.jsp</result>
</action>
</package>
<include file="second-struts.xml"/>
</struts>
7、aaCommon.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>This is aaCommon.jsp</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>
This is aaCommon.jsp
</body>
</html>
8、search.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>This is search.jsp</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>
This is search.jsp
</body>
</html>
9、Common.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>This is Common.jsp</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>
This is Common.jsp
</body>
</html>
10、页面效果
访问一:http://localhost:8080/struts2Test/aa/CommonSearch.action
此时存在namespace="/aa"的package,搜索action,存在
访问二:http://localhost:8080/struts2Test/aa/search.action
此时存在namespace="/aa"的package,搜索action,不存在,报错
访问三:http://localhost:8080/struts2Test/aa/bb/CommonSearch.action
此时不存在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
访问四:http://localhost:8080/struts2Test/CommonSearch.action
存在namespace="/"的package,搜索action,存在
访问五:http://localhost:8080/struts2Test/search.action
存在namespace="/"的package,搜索action,存在
ok!
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