Intellij Idea 15中开发Maven+osgi项目(Apache felix环境)

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