Virgo与Maven整合开发环境搭建(四)

4.web

接下来是这次demo的另一个bundle.而且是个拥有spring-mvc能力的web-bundle(WAB).先来看一下结构

首先来看一下web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns="http://java.sun.com/xml/ns/javaee"
		xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
		xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
		version="2.5">

	<display-name>Search Web Module</display-name>

	<servlet>
		<servlet-name>search</servlet-name>
    	<servlet-class>org.phantom.web.virgo.servlet.DispatcherServlet</servlet-class>
    	<init-param>
    		<param-name>contextClass</param-name>
    		<param-value>org.eclipse.virgo.web.dm.ServerOsgiBundleXmlWebApplicationContext</param-value>
    	</init-param>
	</servlet>

	<servlet-mapping>
		<servlet-name>search</servlet-name>
		<url-pattern>/*</url-pattern>
	</servlet-mapping>
</web-app>

在这个demo中,我们使用的是Spring-MVC,所以,这里加入Spring-MVC支持.这里用到了一个自定义扩展类org.phantom.web.virgo.servlet.DispatcherServlet。说明一下这个类的作用。在OSGI中，每个bundle都是独立的，它拥有独立的ClassLoad，独立的Spring ApplicationContext.但是我们要通过spring从一个bundle中获取另一个bundle的服务,即我们需要这些applicationContext互相认识.怎么做到呢?virgo对这事做了支持.它提供了一个类org.eclipse.virgo.web.dm.ServerOsgiBundleXmlWebApplicationContext.这个类就相当于一个OSGI全局的applicationContext.我们这里就是要将这个类注入到Spring-MVC的DispatcherServlet中.这里通过扩展默认的DispatcherServlet来达到目的

public class DispatcherServlet extends org.springframework.web.servlet.DispatcherServlet{
	@Override
	public void init(ServletConfig config) throws ServletException {
		String contextClass = config.getInitParameter("contextClass");
		if (contextClass != null) {
			try {
				setContextClass(Class.forName(contextClass));
			} catch (ClassNotFoundException e) {
				throw new ServletException(String.format("Context class %s not found", contextClass), e);
			}
		}
		super.init(config);
	}
}

然后来看一下OSGI描述.

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: search web module
Bundle-SymbolicName: org.phantom.demo.web
Bundle-Version: 1.0.0.SNAPSHOT
Import-Template: org.springframework.*;version="[3.0.5,4)"
Import-Package: org.springframework.context.config;version="[3.0.5,4)",
 org.springframework.web.servlet.config;version="[3.0.5,4)"
Excluded-Imports: org.phantom.demo.web
Snap-Host: org.phantom.demo.host;version="1.0.0.SNAPSHOT"
Snap-ContextPath: /search

这里要介绍Snap-ContextPath:/search.前文已经介绍过Host-Snap,这一句配置就是配置当前bundle的请求路径,即第二级路径.还有一句Snap-Host:org.org.phantom.demo.host.这句配置将当前snap挂载到了某个host上.于是,根据前文的介绍,当进入到/demo后,SnapHostFilter开始工作,拿到请求的第二级/search,分发到当前bundle. 接下来的配置就是Spring-MVC的配置了.在WEB-INF/创建与DispatcherServlet同名的search-servlet.xml即可

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:util="http://www.springframework.org/schema/utils"
	xmlns:osgi="http://www.springframework.org/schema/osgi"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
		http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi-1.2.xsd">

	<context:component-scan base-package="org.phantom.demo.web" />
	<mvc:annotation-driven/>
	
	<mvc:resources location="/" mapping="*.html"/>
	<mvc:resources location="/resources/" mapping="/resources/**" />

	<osgi:reference id="pictureSearch" interface="org.phantom.demo.api.SearchHandler" bean-name="pictureSearch"/>
 </beans>

一句句解释一下.第一句,打开包扫描,将Controller加入到Spring管理中

<context:component-scan base-package="org.phantom.demo.web" />

Virgo与Maven整合开发环境搭建(四)

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