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