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这篇文章主要讲解了“如何使用eclipse开发felix的OSGI插件”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“如何使用eclipse开发felix的OSGI插件”吧!
1、官网下载http://felix.apache.org/downloads.cgi,
当前最新版本6.0.3
运行felix窗口有两种方式
(1) 可以直接下载发布版本
Felix Framework Distribution(org.apache.felix.main.distribution-6.0.3.zip)
解压后目录
进入项目目录,命令行下执行
java -jar ./bin/felix.jar
felix.jar 默认会在当前运行目录的 bundle 文件夹内加载启动所需的插件jar,config 目录下的 config.propeties 和 system.properties 里面加载环境变量,如果将其他目录作为启动根目录,该目录下不存在 felix 启动所需信息,启动就会有问题。项目第一次启动的时候会在启动目录下创建一个felix-cache的目录,用于存放框架运行过程产生的数据,当然该目录可以在启动的时候配置,使用 java -jar ./bin/felix.jar <felix-dir> 即可。
(2) 源码导入eclipse运行
下载子项目Main(org.apache.felix.main-6.0.3-project.zip)
解压org.apache.felix.main-6.0.3-project.zip,进入目录,命令行下
运行mvn eclipse:eclipse工程文件,
再输入mvn package,打包编译
File->Import导入到eclipse
在eclipse的org.apache.felix.main.Main类右键运行Run As Java Application
常用命令
lb:查看已装插件包 start:运行插件包 stop:停止运行插件包 install:安装插件包 uninstall:删除插件包 其它命令可以通过help查看
2、felix开发插件
参考是felix官方例子代码apache-felix-osgi-tutorial里的
apache-felix-tutorial-example-2
apache-felix-tutorial-example-2b
apache-felix-tutorial-example-3
这是一个检查输入单词(英文、中文....)是否正确的例子功能
先定义一个服务类:
package test.penngo.service; /** * 简单的定义了一个字典服务接口,该接口的功能只是简单的验证一个词是否正确。 **/ public interface DictionaryService { /** * 检查 单词是否存在 **/ public boolean checkWord(String word); }
英文词典插件包开发
package tutorial.example2; import java.util.Hashtable; import org.osgi.framework.BundleActivator; import org.osgi.framework.BundleContext; import test.penngo.service.DictionaryService; /** * 英文字典服务插件 **/ public class Activator implements BundleActivator { /** * 服务启动 * * @param context the framework context for the bundle. **/ public void start(BundleContext context) { Hashtable<String, String> props = new Hashtable<String, String>(); props.put("Language", "English"); context.registerService(DictionaryService.class.getName(), new DictionaryImpl(), props); } /** * 服务停止 * * @param context the framework context for the bundle. **/ public void stop(BundleContext context) { // NOTE: The service is automatically unregistered. } /** * 英文词典服务实现 **/ private static class DictionaryImpl implements DictionaryService { String[] m_dictionary = { "welcome", "to", "the", "osgi", "tutorial" }; /** * 英文单词检测 **/ public boolean checkWord(String word) { word = word.toLowerCase(); for (int i = 0; i < m_dictionary.length; i++) { if (m_dictionary[i].equals(word)) { return true; } } return false; } } }
META-INF.MF
Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-SymbolicName: English Bundle-Name: English dictionary Bundle-Description: A bundle that registers an English dictionary service Bundle-Vendor: penngo Bundle-Version: 1.0.0 Bundle-Activator: tutorial.example2.Activator Import-Package: org.osgi.framework, test.penngo.service
英文词典插件打包导出,eclipse自带的export打包会有问题,本文使用fatjar工具打包,
中文词典插件包开发
package tutorial.example2b; import java.util.Hashtable; import org.osgi.framework.BundleActivator; import org.osgi.framework.BundleContext; import test.penngo.service.DictionaryService; /** * 中文词典包 **/ public class Activator implements BundleActivator { public void start(BundleContext context) { Hashtable<String, String> props = new Hashtable<String, String>(); props.put("Language", "Chinese"); context.registerService( DictionaryService.class.getName(), new DictionaryImpl(), props); } public void stop(BundleContext context) { // NOTE: The service is automatically unregistered. } /** * 中文词典服务实现 **/ private static class DictionaryImpl implements DictionaryService { // The set of words contained in the dictionary. String[] m_dictionary = { "欢迎", "你好", "教程", "模块" }; public boolean checkWord(String word) { word = word.toLowerCase(); for (int i = 0; i < m_dictionary.length; i++) { if (m_dictionary[i].equals(word)) { return true; } } return false; } } }
Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-SymbolicName: Chinese Bundle-Name: Chinese dictionary Bundle-Description: A bundle that registers a Chinese dictionary service Bundle-Vendor: penngo Bundle-Version: 1.1.0 Bundle-Activator: tutorial.example2b.Activator Import-Package: org.osgi.framework, test.penngo.service
插件打包
客户端调用词典开发,也是作为一个felix插件
package tutorial.example3; import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.IOException; import org.osgi.framework.BundleActivator; import org.osgi.framework.BundleContext; import org.osgi.framework.ServiceReference; import test.penngo.service.DictionaryService; /** * 此客户端在启动时,接收控制台输入,检查输入的单词是否正确,并且打印初相应的检测结果, * 注意:当我们没有输入任何信息的时候,单词检测便会结束,如果需要重新进入单词检测程序,我们需要重新启动插件。 **/ public class Activator implements BundleActivator { public void start(BundleContext context) throws Exception { // 获取所有词典插件 ServiceReference[] refs = context.getServiceReferences( DictionaryService.class.getName(), "(Language=*)"); if (refs != null) { System.out.println("=======当前可用词典插件:" + refs.length); try { System.out.println("Enter a blank line to exit."); BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); String word = ""; while (true) { System.out.print("Enter word: "); word = in.readLine(); if (word.length() == 0) { break; } boolean isCorrect = false; for(ServiceReference service:refs) { DictionaryService dictionary = (DictionaryService) context.getService(service); if (dictionary.checkWord(word)) { isCorrect = true; System.out.println("Correct."); } } if(isCorrect == false) { System.out.println("Incorrect."); } } } catch (IOException ex) { ex.printStackTrace(); } } else { System.out.println("Couldn't find any dictionary service..."); } } /** * Implements BundleActivator.stop(). Does nothing since * the framework will automatically unget any used services. * @param context the framework context for the bundle. **/ public void stop(BundleContext context) { // NOTE: The service is automatically released. } }
Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-SymbolicName: client Bundle-Name: Dictionary client Bundle-Description: A bundle that uses the dictionary service if it finds it at startup Bundle-Vendor: penngo Bundle-Version: 1.3.0 Bundle-Activator: tutorial.example3.Activator Export-Package: test.penngo.service Import-Package: org.osgi.framework #//注意:test.penngo.service这个包与tutorial.example3打在同一个jar中,如果example3.jar更新,其它依赖test.penngo.service的也需要更新或重启felix.
安装插件
把上边生成的插件包example2.jar,example2b.jar,example3.jar入到org.apache.felix.main-6.0.3项目的plugins文件夹中
安装和运行效果:
通过插件方式开发,后期继续扩展增加其它语言词典(日语,俄语,韩语),不需要重启服务,也不影响已存在的语言词典功能(英文、中文)。
3、开发http服务插件
package test.penngo.http.example; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TestServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.getWriter().write("hello penngo"); } }
package test.penngo.http.example; import org.osgi.framework.BundleActivator; import org.osgi.framework.BundleContext; import org.osgi.framework.ServiceReference; import org.osgi.service.http.HttpService; import org.osgi.util.tracker.ServiceTracker; public class Activator implements BundleActivator { private ServiceTracker httpTracker; public void start(BundleContext context) throws Exception { httpTracker = new ServiceTracker(context, HttpService.class.getName(), null) { public void removedService(ServiceReference reference, Object service) { // HTTP service is no longer available, unregister our servlet... try { ((HttpService) service).unregister("/hello"); } catch (IllegalArgumentException exception) { // Ignore; servlet registration probably failed earlier on... } } public Object addingService(ServiceReference reference) { // HTTP service is available, register our servlet... HttpService httpService = (HttpService) this.context.getService(reference); try { httpService.registerServlet("/hello", new TestServlet(), null, null); } catch (Exception exception) { exception.printStackTrace(); } return httpService; } }; // start tracking all HTTP services... httpTracker.open(); } public void stop(BundleContext context) throws Exception { // stop tracking all HTTP services... httpTracker.close(); } }
#MANIFEST.MF Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-SymbolicName: hello Bundle-Name: hello penngo Bundle-Description: Http Hello World Bundle-Vendor: penngo Bundle-Version: 1.0.0 Bundle-Activator: test.penngo.http.example.Activator Import-Package: org.osgi.framework, org.osgi.service.http, org.osgi.util.tracker, javax.servlet.http, javax.servlet
注意htpp插件包依赖:
org.apache.felix.http.base-4.0.6.jar, org.apache.felix.http.bridge-4.0.8.jar, org.apache.felix.http.jetty-4.0.10.jar, org.apache.felix.http.servlet-api-1.1.2.jar, org.apache.felix.http.whiteboard-4.0.0.jar
需要先安装上边的插件包,才能正常在felix中运行http功能。
安装运行效果
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