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<title>csdn_J2EE 应用程序</title>
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<td WIDTH="50%" bordercolor="#FFFFFF" CLASS="t1" bgcolor="#F0F0F0" align="center" nowrap>J2EE 应用程序 </td>
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<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">从以下三种模组装配<SPAN
lang=EN-US>J2EE应用程序：Enterprise Beans,Web
components和J2EE应用程序客户端。这些模组是可重用的，你从已有的Enterprise
Bean和Components建立一个新的应用程序。并且，由于这些模组的轻便性，他们所组成的应用程序将会可以运行在符合规范的任何J2EE服务器。<O:P>
</O:P></SPAN></SPAN></P>
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style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'"> <O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; mso-hansi-font-family: Times New Roman"><FONT
size=3>J2EE应用程序的内容</FONT></SPAN><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'"><O:P>
</O:P></SPAN></P>
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style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'"> <O:P>
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<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">图<SPAN
lang=EN-US>1-4显示J2EE应用程序的继承关系。一个J2EE应用程序可能包含一个或多个Enterprise Bean,Web
components,或J2EE应用程序客户端组件。一个Enterprise Bean由三个Class文件组成，EJB
class,远程接口，Home接口。（下一章将详细讨论这些class文件）.Web Components可包含下列文件类型：Servlet
class,JSP,HTML,GIF.J2EE应用程序客户是运行于可容许其存取J2EE服务的环境（容器）中的Java应用程序。<O:P>
</O:P></SPAN></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">每个<SPAN
lang=EN-US>J2EE应用程序，Web Component,Enterprise Bean,和J2EE应用程序有一个分布描述(Deploy
Descriptor)（图1-4缩写Deploy
Descriptor为DD)。一个分布描述是一个描述组件的.XML文件。例如，EJB分布描述声明Enterprise
Bean的事务特性和安全性认证。因为这些信息是声明性的，不需对Bean的源码进行更改就能改变。运行时，J2EE读取这些信息并逐步操作Beans.<O:P>
</O:P></SPAN></SPAN></P>
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<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">图<SPAN
lang=EN-US>1-4 J2EE应用程序的内容<O:P> </O:P></SPAN></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'"> <O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">J2EE使用某个特别的文件格式来捆绑每个模块，用.ear文件捆绑J2EE应用程序，用.jar捆绑Enterprise
Bean。例如，一个.ear文件，包含一个.xml文件作为其分布描述，或一个或多个EJB.jar和.war文件。一个EJB.jar包含它的分布描述，和作为enterprise
bean的.class文件，下表列出了J2EE应用程序中的每一文件类型：<O:P> </O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'"> <O:P>
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<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">表<SPAN
lang=EN-US>1-2 J2EE文件用途<O:P> </O:P></SPAN></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'"> <O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'"><SPAN
style="mso-tab-count: 1"> </SPAN>元素<SPAN
style="mso-tab-count: 1">
</SPAN>文件类型<O:P> </O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">J2EE应用程序<SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN>.ear<O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">J2EE应用程序分布描述<SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN>.xml<O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">Enterprise
Bean<SPAN style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN>EJB.jar<O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">EJB
分布描述<SPAN style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN>.xml<O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">EJB
class<SPAN style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN>.class<O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">远程接口<SPAN
lang=EN-US><SPAN
style="mso-tab-count: 1">
</SPAN>.class<O:P> </O:P></SPAN></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">Home接口<SPAN
style="mso-tab-count: 1">
</SPAN>.class<O:P> </O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">Web
Component<SPAN style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN>.war<O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">Web
Component分布描述<SPAN
style="mso-tab-count: 1">
</SPAN>.xml<O:P> </O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">JSP文件<SPAN
style="mso-tab-count: 1">
</SPAN>.jsp<O:P> </O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">Servlet
Class<SPAN style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1"> </SPAN>.class<O:P>
</O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">Gif文件<SPAN
style="mso-tab-count: 1">
</SPAN>.gif<O:P> </O:P></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 10pt; mso-hansi-font-family: 'Times New Roman'">Html文件<SPAN
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