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<TD align=middle><FONT color=#339900
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<P>出處：PConline<BR>責(zé)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>
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</DIV> 為了幫助國(guó)內(nèi)J2EE初學(xué)者，將J2EE部分文檔進(jìn)行編譯，期望能夠?qū)V大Java愛(ài)好者有所幫助。 <BR> <BR>
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本文將通過(guò)簡(jiǎn)單例子，描述如何利用EJB開(kāi)發(fā)、部署和運(yùn)行一個(gè)客戶機(jī)/服務(wù)器應(yīng)用。例子的客戶端作為Java獨(dú)立應(yīng)用運(yùn)行，由ConverterClient.java類實(shí)現(xiàn)。它實(shí)現(xiàn)一個(gè)簡(jiǎn)單的實(shí)時(shí)會(huì)話，主要通過(guò)客戶端應(yīng)用調(diào)用服務(wù)器端EJB類ConverterEJB.java來(lái)實(shí)現(xiàn)。如果你已經(jīng)安裝了J2EE，則可以在doc/guides/ejb/examples/converter目錄中找到這些例子。
<BR><BR> 為了實(shí)現(xiàn)本文所描述的簡(jiǎn)單例子，你需要完成以下任務(wù)： <BR><BR> 編寫和編譯EJB程序
<BR><BR> 創(chuàng)建J2EE應(yīng)用 <BR><BR> 打包EJB（.jar） <BR><BR> 部署J2EE應(yīng)用
<BR><BR> 編寫和編譯客戶端程序 <BR><BR> 運(yùn)行客戶端
<BR><BR> 下面章節(jié)我們將就上述工作任務(wù)以及所涉及的知識(shí)點(diǎn)進(jìn)行簡(jiǎn)單闡述。 <BR><BR> 前提
<BR><BR> 實(shí)現(xiàn)本文提供例子的前提是您安裝了Javasoft.com或相關(guān)操作系統(tǒng)廠商網(wǎng)站下載的J2SE
SDK，以及安裝了相應(yīng)操作系統(tǒng)版本的J2EE
SDK(www.javasoft.com下載)并進(jìn)行了正確配置。關(guān)于J2SE和J2EE的安裝、配置和其它進(jìn)一步信息，請(qǐng)參閱產(chǎn)品相關(guān)文檔。
<BR><BR> EJB編碼 <BR><BR> 每個(gè)EJB程序必須要求編寫下述代碼： <BR><BR> 遠(yuǎn)程接口（Remote
interface ） <BR><BR> 本地接口（Home interface ）
<BR><BR> 實(shí)現(xiàn)組件（Enterprise bean class ） <BR><BR> 遠(yuǎn)程接口編碼
<BR><BR> 遠(yuǎn)程接口定義了客戶端能夠調(diào)用的商業(yè)方法，這些商業(yè)方法是有服務(wù)器端的企業(yè)組件實(shí)現(xiàn)的，本文所涉及的Converter.java編碼如下：<BR><BR>import
javax.ejb.EJBObject;//引入必須的包 <BR>import java.rmi.RemoteException;
<BR>public interface Converter extends EJBObject {//必須繼承EJBObject類
<BR>/*定義客戶端可以調(diào)用的方法*/ <BR>public double dollarToYen(double dollars)
throws RemoteException; <BR>public double yenToEuro(double yen)
throws RemoteException; <BR>} <BR><BR clear=all>
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