OSGi 联系服务调用之Equinox

最新推荐文章于 2020-06-07 12:33:59 发布

321哈哈哈

最新推荐文章于 2020-06-07 12:33:59 发布

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分类专栏： OSGI 文章标签： osgi OSGI

本文链接：https://blog.youkuaiyun.com/yinlei212/article/details/8302143

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例子参照infoQ的一个电子书上的要下载网上很多，不知道是我看到的是阉割版的还是什么，那本电子书上说的例子不详细代码不全。、

经过摸索现在给出一个demo。

这个是例子说的是过程是用户通过搜索区搜索一个词语。这次搜索分为4个bundle

1 用户界面demo

2 提供了一个接口bundle ，后面所有的服务都实现他的接口

3 本地服务bundle

4 远程服务bundle

每个工程都是一个bundle，如上图

输入http://localhost/page/index.html 访问例子

下载例子网址：

下面只是代码，具体操作可以参考：

demo工程如下：http://l4.yunpan.cn/lk/QMhEEM83g5Tjk

Activator.java

package demo;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;

import servlet.tranker.HttpServletTranker;

public class Activator implements BundleActivator {

	public static BundleContext context;
	HttpServletTranker httpServiceTracker;
	static BundleContext getContext() {
		return context;
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext bundleContext) throws Exception {
		Activator.context = bundleContext;
		httpServiceTracker = new HttpServletTranker(context);  
		httpServiceTracker.open();  
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext bundleContext) throws Exception {
		Activator.context = null;
		httpServiceTracker.close();
	}

}

index.html

<!DOCTYPE html>
<!-- saved from url=(0021)http://www.baidu.com/ -->
<html>
<script type="text/javascript"
	src="chrome-extension://kajfghlhfkcocafkcjlajldicbikpgnp/catcher.js"></script>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
</head>
<body huaban_screen_capture_injected="true" youdao="bind">
	
					<form name="f" action=/demo>
						<span class="s_ipt_wr">
						<input type="text" name="word"
							id="kw" maxlength="100" class="s_ipt" autocomplete="off"></span>
							<input type="submit" value="so 一下就知道" id="su"
							class="s_btn"></span>
						<div id="sd_1355486068913" style="display: none;"></div>
					</form>
					

</body>
</html>

QueryServlet.java

package servlet;

import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import localquery.imp.LocalDictQueryImp;

import org.osgi.framework.BundleContext;

import remotequery.imp.RemoteDictQueryImp;

import demo.Activator;
import dictquery.interf.DictQueryService;

public class QueryServlet extends HttpServlet
{

	private static final long serialVersionUID = -386158027672842993L;
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException
	{
		resp.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=UTF-8");
		DictQueryService localservice=(DictQueryService) Activator.context.getService(
				Activator.context.getServiceReference(LocalDictQueryImp.class.getName()));
		
		DictQueryService remoteservice=(DictQueryService) Activator.context.getService(
				Activator.context.getServiceReference(RemoteDictQueryImp.class.getName()));
		if(req.getParameter("word")!=null && localservice!=null)
		{
			String local=localservice.query(req.getParameter("word").toString());
			String remote=remoteservice.query(req.getParameter("word").toString());
			OutputStream out=resp.getOutputStream();
			out.write(("word means :<br/>local:"+local).getBytes());
			out.write(("<br/>remote:"+remote).getBytes());
			out.close();
		}else
		{
			OutputStream out=resp.getOutputStream();
			out.write(("sorry no this word!!!").getBytes());
			out.close();
		}
		
		System.out.println("word:"+req.getParameter("word"));
	}
}

HttpServletTranker.java：

package servlet.tranker;

import javax.servlet.ServletException;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.http.HttpService;
import org.osgi.service.http.NamespaceException;
import org.osgi.util.tracker.ServiceTracker;

import servlet.QueryServlet;

public class HttpServletTranker extends ServiceTracker
{
	public HttpServletTranker(BundleContext context)
	{
		super(context, HttpService.class.getName(), null);
	}
	/**
	 * http://localhost/page/index.html
	 * 使用这个网址就可以查看
	 * **/
	@Override
	public Object addingService(ServiceReference reference)
	{
		HttpService service = context.getService(reference);
		try
		{
			service.registerResources("/page/index.html", "/page/index.html",
					null);
			
			service.registerServlet("/demo", new QueryServlet(), null, null);
		} catch (NamespaceException e)
		{
			e.printStackTrace();
		} catch (ServletException e)
		{
			e.printStackTrace();
		}

		// TODO Auto-generated method stub
		return super.addingService(reference);
	}

	@Override
	public void removedService(ServiceReference reference, Object service)
	{
		HttpService httpService = (HttpService) service;
		httpService.unregister("/page/index.html");
		httpService.unregister("/demo");
		super.removedService(reference, service);
	}

}

dictquery工程如下：
dictquery.java

package dictquery;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;

public class Activator implements BundleActivator {

 private static BundleContext context;

 static BundleContext getContext() {
  return context;
 }

 /*
  * (non-Javadoc)
  * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
  */
 public void start(BundleContext bundleContext) throws Exception {
  Activator.context = bundleContext;
 }

 /*
  * (non-Javadoc)
  * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
  */
 public void stop(BundleContext bundleContext) throws Exception {
  Activator.context = null;
 }

}

DictQueryService.java:

package dictquery.interf;

public interface DictQueryService
{
	public String query(String word);
}

localquery工程：

Activator.java：

package localquery;

import localquery.imp.LocalDictQueryImp;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;

public class Activator implements BundleActivator {

	private static BundleContext context;
	private  ServiceRegistration sr=null;
	static BundleContext getContext() {
		return context;
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext bundleContext) throws Exception {
		Activator.context = bundleContext;
		sr=bundleContext.registerService(LocalDictQueryImp.class.getName(), new LocalDictQueryImp(), null);
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext bundleContext) throws Exception {
		Activator.context = null;
		sr.unregister();
	}

}

LocalDictQueryImp.java：

package localquery.imp;

import dictquery.interf.DictQueryService;

public class LocalDictQueryImp implements DictQueryService
{
	@Override
	public String query(String word)
	{
		// TODO Auto-generated method stub
		return "local你猜猜，"+word+" 是什么意思！！！";
	}

}

remotedictquery工程如下：

Activator.java

package remotedictquery;


import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;

import remotequery.imp.RemoteDictQueryImp;

import dictquery.interf.DictQueryService;

public class Activator implements BundleActivator {

	private static BundleContext context;
	private  ServiceRegistration sr=null;
	static BundleContext getContext() {
		return context;
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext bundleContext) throws Exception {
		Activator.context = bundleContext;
		sr=bundleContext.registerService(RemoteDictQueryImp.class.getName(), new RemoteDictQueryImp(), null);
	}

	/*
	 * (non-Javadoc)
	 * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext bundleContext) throws Exception {
		Activator.context = null;
		sr.unregister();
	}

}

RemoteDictQueryImp.java：

package remotequery.imp;

import dictquery.interf.DictQueryService;

public class RemoteDictQueryImp implements DictQueryService
{
	@Override
	public String query(String word)
	{
		// TODO Auto-generated method stub
		return "remote 就不告诉你，"+word+" 是什么意思！！！";
	}

}