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

清疚 2024-02-17 17:39 9阅读 0赞

1.Intellij Idea创建Maven项目

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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：

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主pom配置如下：

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

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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：

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\---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

[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/7d0e221082d74a8ab412e19b77b28ea5.png
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[Center 3]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/e8ef4bd22a794f86b3e8081a0815e289.png