基础的API
BundleActivator BundleContext ServiceReference HelloServiceFactory ServiceTracker
osgi
疑惑：
Import-Package
最最基础的bundle中包含哪些 package？
很多， org.osgi.framework 是其中一个， org.osgi.framework.BundleActivator 则是位于其下。
为什么只导入package ‘org.osgi.framework ’ 即可，不需要导入整个org.eclipse.osgi_3.2.0.v20060601.jar bundle吗？
org.eclipse.osgi_3.2.0.v20060601.jar 对应几个bundle ———— osgi中 一个jar 只能对应一个bundle吗？ 是的！
看看其中的MANIFEST.MF就知道了吧
Manifest-Version: 1.0
Bundle-Activator: org.eclipse.osgi.framework.internal.core.SystemBundl
eActivator
Bundle-RequiredExecutionEnvironment: J2SE-1.4,OSGi/Minimum-1.0
Export-Package: org.eclipse.osgi.event;version="1.0",org.eclipse.osgi.
framework.console;version="1.0",org.eclipse.osgi.framework.eventmgr;v
ersion="1.0",org.eclipse.osgi.framework.log;version="1.0",org.eclipse
.osgi.service.datalocation;version="1.0",org.eclipse.osgi.service.deb
ug;version="1.0",org.eclipse.osgi.service.environment;version="1.0",o
rg.eclipse.osgi.service.localization;version="1.0",org.eclipse.osgi.s
ervice.pluginconversion;version="1.0",org.eclipse.osgi.service.resolv
er;version="1.0",org.eclipse.osgi.service.runnable;version="1.0",org.
eclipse.osgi.service.urlconversion;version="1.0",org.eclipse.osgi.sto
ragemanager;version="1.0",org.eclipse.osgi.util;version="1.0",org.osg
i.framework;version="1.3",org.osgi.service.condpermadmin;version="1.0
",org.osgi.service.packageadmin;version="1.2",org.osgi.service.permis
sionadmin;version="1.2",org.osgi.service.startlevel;version="1.0",org
.osgi.service.url;version="1.0",org.osgi.util.tracker;version="1.3.1"
,org.eclipse.core.runtime.adaptor;x-friends:="org.eclipse.core.runtim
e",org.eclipse.core.runtime.internal.adaptor;x-internal:=true,org.ecl
ipse.core.runtime.internal.stats;x-friends:="org.eclipse.core.runtime
",org.eclipse.osgi.baseadaptor;x-internal:=true,org.eclipse.osgi.base
adaptor.bundlefile;x-internal:=true,org.eclipse.osgi.baseadaptor.hook
s;x-internal:=true,org.eclipse.osgi.baseadaptor.loader;x-internal:=tr
ue,org.eclipse.osgi.framework.adaptor;x-internal:=true,org.eclipse.os
gi.framework.debug;x-internal:=true,org.eclipse.osgi.framework.intern
al.core;x-internal:=true,org.eclipse.osgi.framework.internal.protocol
;x-internal:=true,org.eclipse.osgi.framework.internal.protocol.bundle
entry;x-internal:=true,org.eclipse.osgi.framework.internal.protocol.b
undleresource;x-internal:=true,org.eclipse.osgi.framework.internal.pr
otocol.reference;x-internal:=true,org.eclipse.osgi.framework.internal
.reliablefile;x-internal:=true,org.eclipse.osgi.framework.launcher;x-
internal:=true,org.eclipse.osgi.framework.util;x-internal:=true,org.e
clipse.osgi.internal.baseadaptor;x-internal:=true,org.eclipse.osgi.in
ternal.module;x-internal:=true,org.eclipse.osgi.internal.profile;x-in
ternal:=true,org.eclipse.osgi.internal.resolver;x-internal:=true,org.
eclipse.osgi.internal.verifier;x-internal:=true,org.eclipse.osgi.inte
rnal.provisional.verifier;x-friends:="org.eclipse.update.core,org.ecl
ipse.ui.workbench"
Bundle-Version: 3.2..v20060601
Eclipse-SystemBundle: true
Bundle-Copyright: %copyright
Bundle-Name: %systemBundle
Bundle-Description: %systemBundle
Bundle-DocUrl: http://www.eclipse.org
Bundle-ManifestVersion:
Export-Service: org.osgi.service.packageadmin.PackageAdmin,org.osgi.se
rvice.permissionadmin.PermissionAdmin,org.osgi.service.startlevel.Sta
rtLevel,org.eclipse.osgi.service.debug.DebugOptions
Bundle-Vendor: %eclipse.org
Main-Class: org.eclipse.core.runtime.adaptor.EclipseStarter
Bundle-SymbolicName: org.eclipse.osgi; singleton:=true
Bundle-Localization: systembundle
Eclipse-ExtensibleAPI: true