1.Intellij Idea创建Maven项目

利用maven模板快速创建maven项目，如图操作，填写g(groupid)a(artifactid)v(version)。

maven home directory 选择系统默认或者自己下载下来的maven主目录。

2.将项目模块化

利用maven的依赖以及集成的特性，将项目模块化。

在主module下创建module并继承主module。

这里我创建了server以及client，项目结构如下图，先忽略红圈之外的文件夹：

主pom配置如下：

<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/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 
 <groupId>com.renming.osgi.helloworld</groupId>
 <artifactId>helloworld</artifactId>
 <version>1.0.0</version>
 <modules>
 <module>server</module>
 <module>client</module>
 </modules>
 <packaging>pom</packaging>
 
 <name>helloworld</name>
 <url>http://maven.apache.org</url>
 
 <properties>
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 </properties>
 
 <dependencyManagement>
 <dependencies>
 <dependency>
 <groupId>com.renming.osgi.helloworld</groupId>
 <artifactId>server</artifactId>
 <version>${project.version}</version>
 </dependency>
 <dependency>
 <groupId>org.eclipse</groupId>
 <artifactId>osgi</artifactId>
 <version>3.9.1-v20130814-1242</version>
 <scope>provided</scope>
 </dependency>
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>3.8.1</version>
 <scope>test</scope>
 </dependency>
 </dependencies>
 </dependencyManagement>
</project>

server模块pom配置如下：

<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/xsd/maven-4.0.0.xsd">
 <parent>
 <artifactId>helloworld</artifactId>
 <groupId>com.renming.osgi.helloworld</groupId>
 <version>1.0.0</version>
 </parent>
 <modelVersion>4.0.0</modelVersion>
 
 <artifactId>server</artifactId>
 <packaging>bundle</packaging>
 
 <name>server</name>
 <url>http://maven.apache.org</url>
 
 <properties>
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 </properties>
 
 <dependencies>
 <dependency>
 <groupId>org.eclipse</groupId>
 <artifactId>osgi</artifactId>
 </dependency>
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>3.8.1</version>
 <scope>test</scope>
 </dependency>
 </dependencies>
 
 <build>
 <plugins>
 <plugin>
 <groupId>org.apache.felix</groupId>
 <artifactId>maven-bundle-plugin</artifactId>
 <version>2.4.0</version>
 <extensions>true</extensions>
 <configuration>
 <instructions>
 <Bundle-Version>${project.version}</Bundle-Version>
 <Bundle-SymbolicName>$(replace;${project.artifactId};-;_)</Bundle-SymbolicName>
 <Export-Package>
 com.renming.osgi.helloworld.server.inter;version="${project.version}"
 </Export-Package>
 <Import-Package>
 org.osgi.framework
 </Import-Package>
 <Bundle-Activator>
 com.renming.osgi.helloworld.Activator
 </Bundle-Activator>
 </instructions>
 </configuration>
 </plugin>
 </plugins>
 </build>
</project>

client模块pom配置如下：

<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/xsd/maven-4.0.0.xsd">
 <parent>
 <artifactId>helloworld</artifactId>
 <groupId>com.renming.osgi.helloworld</groupId>
 <version>1.0.0</version>
 </parent>
 <modelVersion>4.0.0</modelVersion>
 
 <artifactId>client</artifactId>
 <packaging>bundle</packaging>
 
 <name>client</name>
 <url>http://maven.apache.org</url>
 
 <properties>
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 </properties>
 
 <dependencies>
 <dependency>
 <groupId>com.renming.osgi.helloworld</groupId>
 <artifactId>server</artifactId>
 </dependency>
 <dependency>
 <groupId>org.eclipse</groupId>
 <artifactId>osgi</artifactId>
 </dependency>
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>3.8.1</version>
 <scope>test</scope>
 </dependency>
 </dependencies>
 
 
 <build>
 <plugins>
 <plugin>
 <groupId>org.apache.felix</groupId>
 <artifactId>maven-bundle-plugin</artifactId>
 <version>2.4.0</version>
 <extensions>true</extensions>
 <configuration>
 <instructions>
 <Bundle-Version>${project.version}</Bundle-Version>
 <Bundle-SymbolicName>$(replace;${project.artifactId};-;_)
 </Bundle-SymbolicName>
 <Import-Package>
 org.osgi.framework,com.renming.osgi.helloworld.server.inter;version="${project.version}"
 </Import-Package>
 <Bundle-Activator>
 com.renming.osgi.helloworld.Activator
 </Bundle-Activator>
 </instructions>
 </configuration>
 </plugin>
 </plugins>
 </build>
</project>

主pom和子pom拥有继承关系，同时进行了模块化。

3.编写简单的测试用例

通过实现BundleActivator接口，可以实现与osgi框架环境的通信。

这里需要实现start以及stop，分别在bundle启动以及终止的时候被调用。

这里让它在server bundle启动的时候注册一个简单的服务：

package com.renming.osgi.helloworld;
 
import java.util.ArrayList;
import java.util.List;
 
import com.renming.osgi.helloworld.server.impl.HelloImpl;
import com.renming.osgi.helloworld.server.inter.Hello;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
 
public class Activator implements BundleActivator {
 
 private List<ServiceRegistration> registrations = new ArrayList<ServiceRegistration>();
 
 private static BundleContext context;
 
 static BundleContext getContext() {
 return context;
 }
 
 public void start(BundleContext bundleContext) throws Exception {
 Activator.context = bundleContext;
 System.out.println("----------------hello start---------------------");
 //注册hello接口中的服务
 registrations.add(bundleContext
 .registerService(Hello.class.getName(), new HelloImpl("Hello, OSGi"), null));
 System.out.println("----------------hello start---------------------");
 }
 
 public void stop(BundleContext bundleContext) throws Exception {
 Activator.context = null;
 
 for (ServiceRegistration registration : registrations) {
 System.out.println("unregistering: " + registration);
 registration.unregister();
 }
 
 }
 
}

需要注意的是编写完代码后，需要配置server模块pom中打包插件，完整的上面已经列出了。

然后是cilent模块中测试代码，需要从bundleContext中获取到对应的服务，只需要提供服务名就可以了。具体代码如下：

package com.renming.osgi.helloworld;
 
 
import com.renming.osgi.helloworld.server.inter.Hello;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
 
public class Activator implements BundleActivator {
 
	public void start(BundleContext ctx) {
		System.out.println("----------------hello client start---------------------");
	 ServiceReference ref = ctx.getServiceReference(Hello.class.getName());
	 if (ref != null) {
	 Hello hello = null;
	 try {
	 hello = (Hello) ctx.getService(ref);
	 if (hello != null)
	 hello.sayHello();
	 else
	 System.out.println("Service:Hello---object null");
	 } catch (RuntimeException e) {
	 e.printStackTrace();
	 } finally {
	 ctx.ungetService(ref);
	 hello = null;
	 }
	 } else {
	 System.out.println("Service:Hello---not exists");
	 }
		System.out.println("----------------hello client start---------------------");
	}
 
	public void stop(BundleContext ctx) throws Exception {
 
	}
 
}

4.配置Apache felix环境

下载：http://felix.apache.org/downloads.cgi

解压之后拷贝bin、conf、bundle目录到主目录下方便执行以及修改配置，同时创建plugins文件夹用于存放我们编写的bundle。

最后目录结构如下：

---执行bin中felix.jar

---控制台显示g！无报错信息则执行成功

---执行命令lb，可以查看已启动bundle

---然后打包client模块以及server模块，并将打包的jar包拷贝到plugins中

---执行命令 install file:plugins/XXX.jar,会显示ID，然后执行start ID，最后执行lb查看是否启动成功，并打印对应的信息

由于client以及server都是在本地调用，如果需要远程调用可以参考这篇文章：

http://www.cnblogs.com/lw900320/archive/2012/06/26/2563221.html