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<TD>您現在的位置：<A
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<TD align=middle><FONT color=#339900
size=3><B>實例教程:J2EE編程起步</B></FONT><BR></TD>
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<P>出處：PConline<BR>責任編輯：pcedu</P></TD></TR>
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<TD width=96>[03-9-18 15:03] </TD>
<TD align=middle>作者：胡德平 </TD></TR></TBODY></TABLE>
<DIV align=center><SPAN id=zl_550>-</SPAN> </DIV><BR>開發客戶端
<BR><BR>客戶端程序ConverterClient是一個獨立運行的Java應用，創建ConverterClient主要包括以下步驟：
<BR><BR>1. 客戶端編碼 <BR><BR>2. 客戶端編譯 <BR><BR>客戶端編碼
<BR><BR>ConverterClient.java 源碼展示了EJB客戶端最基本的任務實現，即： <BR><BR>定位本地接口
<BR><BR>創建企業組件（EJB） <BR><BR>調用商業方法 <BR><BR>定位本地接口
<BR>ConverterHome接口定義了EJB聲明周期方法如create，在中ConverterClient
可以調用create方法之前ConverterHome對象必須被實例化，包括三個步驟： <BR><BR>1. 創建JNDI命名上下文
<BR>Context initial = new InitialContext(); <BR><BR>2.
查找與JNDI命名MyConverter綁定的對象 <BR>java.lang.Object objref =
initial.lookup("MyConverter"); <BR><BR>3. 限定指向ConverterHome對象的參考
<BR><BR>ConverterHome home = (ConverterHome)
PortableRemoteObject.narrow(objref, <BR>ConverterHome.class);
<BR><BR>創建企業組件（EJB）實例
<BR><BR>客戶端通過調用本地接口ConvertHome對象的create方法創建ConverterEJB類對象， create
方法返回組件Converter類型的對象。然后，遠程方法定義的在ConverterEJB實現的商業方法可以被客戶端調用。當客戶端調用create
方法時，EJB容器將實例化ConverterEJB，然后調用ConverterEJB.ejbCreate 方法。
<BR><BR>Converter currencyConverter = home.create(); <BR><BR
clear=all>
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