blocks|key|286191|text|简单地说，OSGi是一个动态的Java模块系统。它定义了安装、卸载、更新、启动和停止模块的方法。这些模块被称为包，但在它们最简单的形式中，实际上是带有特殊清单的Java+jar文件。可以在不停止或重新启动Java+VM的情况下安装、卸载等模块。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|286192|OSGi框架以一种安全的方式管理所描述的包的生命周期和包之间的依赖关系。捆绑包需要声明它导出和导入了哪些Java包。import和export语句可以使用版本信息进行注释，这样您甚至可以在同一个Java+VM中拥有同一个包的多个版本。|286193|OSGi联盟是指定OSGi框架和许多附带服务的组织，例如用于管理配置数据、设备访问等。|286194|这只是一个非常基本的概述。OSGi远不止这些。请看一下https://www.osgi.org/resources/architecture/+(对OSGi架构的介绍)和https://www.osgi.org/resources/where-to-start/+(OSGi联盟推荐的许多链接和进一步的读物)。|offset|length|286195|更新07/2021|style|BOLD|286196|到2021年为止，OSGi联盟将所有资源和工作都转移到了Eclipse+Foundation。它继续在新成立的OSGi工作组中开展工作。|286197|entityMap|0|LINK|mutability|MUTABLE|url|https://www.osgi.org/resources/architecture/|1|https://www.osgi.org/resources/where-to-start/^0|0|0|0|R|18|0|2D|1A|1|0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@$H|13|I|14|1|15]|$H|16|I|17|1|18]]|A|$]]|$1|J|3|K|5|6|7|19|8|@$H|1A|I|1B|L|M]]|9|@]|A|$]]|$1|N|3|O|5|6|7|1C|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]|X|$5|S|T|U|A|$V|Y]]]]

Simply said, OSGi is a dynamic module system for Java. It defines means to install, uninstall, update, start and stop modules. Those modules are called bundles, but are, in their simplest form, actually Java jar files with a special Manifest. Modules can be installed, uninstalled etc without stopping or restarting the Java VM.
An OSGi framework manages the described lifecycle of and dependencies between the bundles in a secure way. A bundle needs to state which Java packages it exports and which it imports. The import and export statements can be annotated with version information, so that you even can have more than one version of the same package in the same Java VM.
The OSGi Alliance is the organization that specifies the OSGi framework and many accompanying services, e.g. for managing configuration data, device access, etc.
This is just a very basic overview. OSGi is much more.
Please have a look at <a href="https://www.osgi.org/resources/architecture/" rel="nofollow noreferrer">https://www.osgi.org/resources/architecture/</a> (an introduction to OSGi's architecture) and <a href="https://www.osgi.org/resources/where-to-start/" rel="nofollow noreferrer">https://www.osgi.org/resources/where-to-start/</a> (a lot of links and further readings recommended by the OSGi Alliance).
Update 07/2021 
As of 2021 the OSGi Alliance moved all resources and work to the Eclipse Foundation. It continuous its work in the newly established OSGi Working Group.

blocks|key|3214790|text|以一些反对票为代价;-)，我想用我自己的话回答这个问题(这样我就可以纠正我的理解)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3214791|我们将应用程序构建为一组模块，每个模块在功能上相互内聚，并与其他模块松散耦合。正如您可能已经知道的，这有许多优点。随着时间的推移，模块化的单元已经从函数到类，再到包，再到部署单元(就像Java中的jar和.Net中的组装)。但所有这些都只是在开发期间，一旦部署了应用程序(这是一组模块)，服务器仍然将其视为一个巨大的整体应用程序，即在运行时不会保留逻辑边界。OSGi在开发和运行时中明确了这些界限，而不是other+benefits+outlined+here|offset|length|style|BOLD|3214792|我推荐这本很棒的免费书来帮助你入门OSGi+in+Practice|3214793|如果您在Java平台上工作，也可以查看这个演示文稿：Why+Have+The+OSGi+Specifications+Been+Based+On+Java™+Technology?|3214794|entityMap|0|LINK|mutability|MUTABLE|url|http://www.osgi.org/About/WhyOSGi|1|http://s3.amazonaws.com/neilbartlett.name/osgibook_preview_20090110.pdf|2|http://www.google.com/url?sa=t&source=web&cd=3&ved=0CCQQFjAC&url=http%253A%252F%252Fwww.aqute.biz%252Fpresentations%252FWhyOSGI.ppt&rct=j&q=osgi%2520and%2520.net&ei=cUQhTcfSI8ys8Aa-h7jjCg&usg=AFQjCNHShDczu6n_ILCPnjyo072k-O3aog&sig2=U-9QGZUoZ0crZXwHRpajfw^0|0|54|6|5M|S|0|0|H|G|1|0|Q|1S|2|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@$D|11|E|12|1|13]]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@$D|15|E|16|1|17]]|A|$]]|$1|J|3|K|5|6|7|18|8|@]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|L|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]|V|$5|O|P|Q|A|$R|W]]]]

At the expense of some down votes ;-), I'd like to answer this in my own words (so that I can get corrected on my understanding).

We build applications as a set of modules, each module functionally cohesive with-in itself and loosely coupled with other modules. This has many advantages as you might already know. Overtime time, the unit of modularity has improved from functions to classes to packages to a unit of deployment (like jar in Java and assembly in .Net). But all of this is only during development time, once the application (which is a set of modules) is deployed, the server still see's it as one giant monolithic application i.e. the logical boundaries are not preserved during runtime. OSGi makes these boundaries explicit during development as well as runtime apart from <a href="http://www.osgi.org/About/WhyOSGi">other benefits outlined here</a>

I suggest this excellent free book to get you started <a href="http://s3.amazonaws.com/neilbartlett.name/osgibook_preview_20090110.pdf">OSGi in Practice</a>

If you work on Java platform, also check this presentation: <a href="http://www.google.com/url?sa=t&amp;source=web&amp;cd=3&amp;ved=0CCQQFjAC&amp;url=http%3A%2F%2Fwww.aqute.biz%2Fpresentations%2FWhyOSGI.ppt&amp;rct=j&amp;q=osgi%20and%20.net&amp;ei=cUQhTcfSI8ys8Aa-h7jjCg&amp;usg=AFQjCNHShDczu6n_ILCPnjyo072k-O3aog&amp;sig2=U-9QGZUoZ0crZXwHRpajfw">Why Have The OSGi Specifications Been Based On Java™ Technology?</a>

I've just started hearing the term OSGi being used (while reading tutorials on common Java EE containers such as GlassFish and Spring), however I have been unable to find a simple, straight-forward, easy-to-understand explanation of what OSGi is that an enterprise novice such as myself would understand.

Can someone provide such a dummy-proof explanation? Maybe with some examples or even code excerpts?

Thanks!

What is OSGi and what are some examples of its use?

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我刚开始听到有人使用术语 OSGi  (在阅读关于GlassFish和Spring等常见Java容器的教程时)，但是我一直找不到像我这样的企业新手能够理解的关于OSGi是什么的简单、直截了当、易于理解的解释。有没有人能提供这样一个可靠的解释？也许有一些例子，甚至是代码摘录？谢谢!

问什么是OSGi ?它的用法有哪些示例？
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