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                <TD>您现在的位置：<A 
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                <TD align=middle><FONT color=#339900 
                  size=3><B>实例教程:J2EE编程起步</B></FONT><BR></TD>
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                  <P>出处：PConline<BR>责任编辑：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>开发客户端 
            <BR><BR>客户端程序ConverterClient是一个独立运行的Java应用，创建ConverterClient主要包括以下步骤： 
            <BR><BR>1. 客户端编码 <BR><BR>2. 客户端编译 <BR><BR>客户端编码 
            <BR><BR>ConverterClient.java 源码展示了EJB客户端最基本的任务实现，即： <BR><BR>定位本地接口 
            <BR><BR>创建企业组件（EJB） <BR><BR>调用商业方法 <BR><BR>定位本地接口 
            <BR>ConverterHome接口定义了EJB声明周期方法如create，在中ConverterClient 
            可以调用create方法之前ConverterHome对象必须被实例化，包括三个步骤： <BR><BR>1. 创建JNDI命名上下文 
            <BR>Context initial = new InitialContext(); <BR><BR>2. 
            查找与JNDI命名MyConverter绑定的对象 <BR>java.lang.Object objref = 
            initial.lookup("MyConverter"); <BR><BR>3. 限定指向ConverterHome对象的参考 
            <BR><BR>ConverterHome home = (ConverterHome) 
            PortableRemoteObject.narrow(objref, <BR>ConverterHome.class); 
            <BR><BR>创建企业组件（EJB）实例 
            <BR><BR>客户端通过调用本地接口ConvertHome对象的create方法创建ConverterEJB类对象， create 
            方法返回组件Converter类型的对象。然后，远程方法定义的在ConverterEJB实现的商业方法可以被客户端调用。当客户端调用create 
            方法时，EJB容器将实例化ConverterEJB，然后调用ConverterEJB.ejbCreate 方法。 
            <BR><BR>Converter currencyConverter = home.create(); <BR><BR 
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