osgi入门
开发环境：Eclipse JEE 3.6（Helio）
开发步骤：
1、创建基于Equinox的plugin工程，工程名为DictQuery，用于定义一个字典查询的接口。
2、创建基于Equinox的plugin工程，工程名为RemoteDictQuery，实现了字典查询接口，在Activator类中注册服务。在Manifest.mf配置中导入org.sunny.dictQuery包。
3、创建基于Equinox的plugin工程，工程名为LocalDictQuery，实现了字典查询接口，采用Declarative Service方法注册服务，此工程不需要Activator类。在Manifest.mf配置中导入org.sunny.dictQuery包。
工程下建目录OSGI-INF，Component.xm配置如下。
<?xml version="1.0" encoding="UTF-8"?>
<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" name="LocalDictService">
<implementation class="org.sunny.ldq.LocalDictQueryServiceImpl"/>
<service>
<provide interface="org.sunny.dictQuery.QueryService"/>
</service>
</scr:component>
4、创建基于Equinox的plugin工程，工程名为QueryServlet，用于提供http服务。
在src目录下创建page目录，置放dictQuery.html，内容如下。
QueryServlet类注册servlet和resource，响应http请求。
在工程下建立OSGI-INF目录，配置component.xml，以declarative service方式引入QueryService和HttpService。
<?xml version="1.0" encoding="UTF-8"?>
<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" name="QueryServlet">
<implementation class="org.sunny.servlet.QueryServlet"/>
<reference bind="setQueryService" cardinality="1..1" interface="org.sunny.dictQuery.QueryService" name="QueryService" policy="dynamic" unbind="unsetQueryService"/>
<reference bind="setHttpService" cardinality="1..1" interface="org.osgi.service.http.HttpService" name="HttpService" policy="dynamic" unbind="unsetHttpService"/>
</scr:component>
在Manifest.mf中要导入的包有java.servlet，java.servlet.http，org.sunny.dictQuery，org.osgi.service.http。
5、配置运行时环境。
在osgi控制台输入ss命令，可以看到以下内容。
osgi> ss
Framework is launched.
id State Bundle
0 ACTIVE org.eclipse.osgi_3.6.2.R36x_v20110210
1 ACTIVE org.apache.commons.logging_1.0.4.v201005080501
2 ACTIVE DictQuery_1.0.0.qualifier
3 ACTIVE org.eclipse.equinox.http.jetty_2.0.0.v20100503
4 ACTIVE LocalDictQuery_1.0.0.qualifier
5 ACTIVE org.eclipse.osgi.services_3.2.100.v20100503
6 ACTIVE javax.servlet_2.5.0.v200910301333
7 ACTIVE RemoteDictQuery_1.0.0.qualifier
8 ACTIVE QueryServlet_1.0.0.qualifier
9 ACTIVE org.eclipse.equinox.http.servlet_1.1.0.v20100503
10 ACTIVE org.eclipse.equinox.ds_1.2.1.R36x_v20100803
11 ACTIVE org.mortbay.jetty.server_6.1.23.v201004211559
12 ACTIVE org.mortbay.jetty.util_6.1.23.v201004211559
13 ACTIVE org.eclipse.equinox.util_1.0.200.v20100503
在浏览器输入http://localhost/static/dictQuery.htm访问，填入sky查询，输出“天空”，后台打印“RemoteDictQueryServiceImpl.queryWord called!”。
在osgi控制台输入stop 7命令，停止运行RemoteDictQuery bundle。填入test查询，输出“测试”，后台打印“LocalDictQueryServiceImpl.queryWord called!”。
附件中是这四个工程的project文件，可download并运行，good luck！
开发步骤：
1、创建基于Equinox的plugin工程，工程名为DictQuery，用于定义一个字典查询的接口。
package org.sunny.dictQuery;
public interface QueryService {
String queryWord(String word);
}
2、创建基于Equinox的plugin工程，工程名为RemoteDictQuery，实现了字典查询接口，在Activator类中注册服务。在Manifest.mf配置中导入org.sunny.dictQuery包。
package org.sunny.remote;
import java.util.concurrent.ConcurrentHashMap;
import org.sunny.dictQuery.QueryService;
public class RemoteDictQueryServiceImpl implements QueryService {
private static final ConcurrentHashMap<String, String> dict = new ConcurrentHashMap<String, String>();
static {
dict.put("sky", "天空");
dict.put("computer", "计算机");
}
@Override
public String queryWord(String word) {
System.out.println("RemoteDictQueryServiceImpl.queryWord called!");
String result = dict.get(word);
if (result == null)
result = "N/A";
return result;
}
}
package org.sunny.remote;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import org.sunny.dictQuery.QueryService;
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 = context.registerService(QueryService.class.getName(),
new RemoteDictQueryServiceImpl(), 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();
}
}
3、创建基于Equinox的plugin工程，工程名为LocalDictQuery，实现了字典查询接口，采用Declarative Service方法注册服务，此工程不需要Activator类。在Manifest.mf配置中导入org.sunny.dictQuery包。
package org.sunny.ldq;
import java.util.concurrent.ConcurrentHashMap;
import org.sunny.dictQuery.QueryService;
public class LocalDictQueryServiceImpl implements QueryService {
private static final ConcurrentHashMap<String, String> dict = new ConcurrentHashMap<String, String>();
static {
dict.put("test", "测试");
dict.put("china", "中国");
}
@Override
public String queryWord(String word) {
System.out.println("LocalDictQueryServiceImpl.queryWord called!");
String result = dict.get(word);
if (result == null)
result = "N/A";
return result;
}
}
工程下建目录OSGI-INF，Component.xm配置如下。
<?xml version="1.0" encoding="UTF-8"?>
<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" name="LocalDictService">
<implementation class="org.sunny.ldq.LocalDictQueryServiceImpl"/>
<service>
<provide interface="org.sunny.dictQuery.QueryService"/>
</service>
</scr:component>
4、创建基于Equinox的plugin工程，工程名为QueryServlet，用于提供http服务。
在src目录下创建page目录，置放dictQuery.html，内容如下。
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>demo</title> </head> <body> <form action="/query"> <input type="text" name="query_word"> <input type="submit" value="查询" > </form> </body> </html>
QueryServlet类注册servlet和resource，响应http请求。
package org.sunny.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.osgi.service.http.HttpService;
import org.sunny.dictQuery.QueryService;
public class QueryServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private QueryService query = null;
private HttpService http = null;
public QueryServlet() {
}
public void setQueryService(QueryService query) {
this.query = query;
}
public void unsetQueryService(QueryService query) {
if (this.query != query)
return;
this.query = null;
}
public void setHttpService(HttpService http) {
this.http = http;
try {
http.registerServlet("/query", this, null, null);
http.registerResources("/static", "page", null);
} catch (Exception e) {
e.printStackTrace();
}
}
public void unsetHttpService(HttpService http) {
this.http.unregister("/query");
this.http.unregister("/static");
this.http = null;
}
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String word = req.getParameter("query_word");
resp.setCharacterEncoding("UTF-8");
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out = resp.getWriter();
if (query != null) {
out.println(query.queryWord(word));
} else {
out.println("no impl for query servcie...");
out.close();
return;
}
}
}
在工程下建立OSGI-INF目录，配置component.xml，以declarative service方式引入QueryService和HttpService。
<?xml version="1.0" encoding="UTF-8"?>
<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" name="QueryServlet">
<implementation class="org.sunny.servlet.QueryServlet"/>
<reference bind="setQueryService" cardinality="1..1" interface="org.sunny.dictQuery.QueryService" name="QueryService" policy="dynamic" unbind="unsetQueryService"/>
<reference bind="setHttpService" cardinality="1..1" interface="org.osgi.service.http.HttpService" name="HttpService" policy="dynamic" unbind="unsetHttpService"/>
</scr:component>
在Manifest.mf中要导入的包有java.servlet，java.servlet.http，org.sunny.dictQuery，org.osgi.service.http。
5、配置运行时环境。
在osgi控制台输入ss命令，可以看到以下内容。
osgi> ss
Framework is launched.
id State Bundle
0 ACTIVE org.eclipse.osgi_3.6.2.R36x_v20110210
1 ACTIVE org.apache.commons.logging_1.0.4.v201005080501
2 ACTIVE DictQuery_1.0.0.qualifier
3 ACTIVE org.eclipse.equinox.http.jetty_2.0.0.v20100503
4 ACTIVE LocalDictQuery_1.0.0.qualifier
5 ACTIVE org.eclipse.osgi.services_3.2.100.v20100503
6 ACTIVE javax.servlet_2.5.0.v200910301333
7 ACTIVE RemoteDictQuery_1.0.0.qualifier
8 ACTIVE QueryServlet_1.0.0.qualifier
9 ACTIVE org.eclipse.equinox.http.servlet_1.1.0.v20100503
10 ACTIVE org.eclipse.equinox.ds_1.2.1.R36x_v20100803
11 ACTIVE org.mortbay.jetty.server_6.1.23.v201004211559
12 ACTIVE org.mortbay.jetty.util_6.1.23.v201004211559
13 ACTIVE org.eclipse.equinox.util_1.0.200.v20100503
在浏览器输入http://localhost/static/dictQuery.htm访问，填入sky查询，输出“天空”，后台打印“RemoteDictQueryServiceImpl.queryWord called!”。
在osgi控制台输入stop 7命令，停止运行RemoteDictQuery bundle。填入test查询，输出“测试”，后台打印“LocalDictQueryServiceImpl.queryWord called!”。
附件中是这四个工程的project文件，可download并运行，good luck！