JAR组件与EAR有何不同？ （应用服务器）

Question

JAR与EAR文件相对于EJB的distinction是什么？ Glassfish的帮助说：

thufir@doge:~$ 
thufir@doge:~$ GlassFish_Server/bin/asadmin deploy --help 

...

 --type 
      The packaging archive type of the component that is being deployed. 
      Possible values are as follows: 

      car 
       The component is packaged as a CAR file. 

      ear 
       The component is packaged as an EAR file. 

      ejb 
       The component is an EJB packaged as a JAR file. 

      osgi 
       The component is packaged as an OSGi bundle. 

      rar 
       The component is packaged as a RAR file. 

      war 
       The component is packaged as a WAR file. 

因此，一个EJB可以打包成一个文件JAR？什么是功能差异？具体来说，EAR组件可以做什么JAR不能？

Answer 1

EAR -耳朵文件基本上旨在包含完整的企业应用程序。它包含构成特定Java EE应用程序的所有组件。企业应用程序被定义为.jar文件，资源，类和多个Web应用程序的集合.JAR文件封装了一个或多个Java类，清单和描述符。 Jar文件基本上是为了保存Java类，资源等的通用库。而且，JAR文件是归档的最低级别。 JAR文件在Java EE中用于打包EJB和客户端Java应用程序。