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286 lines
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<div class="header">
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javax.rmi
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<h2 class="title" title="Class PortableRemoteObject">Class PortableRemoteObject</h2>
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</div><div class="contentContainer">
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<ul class="inheritance">
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<li><a href="../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
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<li>
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<ul class="inheritance">
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<li>javax.rmi.PortableRemoteObject</li>
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<div class="description">
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<hr/> <br/> <pre>public class <span class="typeNameLabel">PortableRemoteObject</span>
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extends <a href="../../java/lang/Object.html" title="class in java.lang">Object</a></pre>
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<div class="block">
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<span>服务器实现对象可以从javax.rmi.PortableRemoteObject继承，也可以实现远程接口，然后使用exportObject方法将自身注册为服务对象。</span>
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<span>toStub方法接受服务器实现，并返回可用于访问该服务器对象的存根。</span>
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<span>连接方法使远程对象准备好进行远程通信。</span>
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<span>unreportObject方法用于注销服务器对象，使其可用于垃圾回收。</span>
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<span>窄方法采用对象引用或抽象接口类型，并尝试缩小它以符合给定的接口。</span>
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<span>如果操作成功，结果将是指定类型的对象，否则将抛出异常。</span>
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<div class="summary">
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<!-- --> </a> <h3>构造方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Constructor Summary table, listing constructors, and an explanation">
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<caption>
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<span>构造方法</span>
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<span class="tabEnd"> </span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">Modifier</th>
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<th class="colLast" scope="col">Constructor and Description</th>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>protected </code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/rmi/PortableRemoteObject.html#PortableRemoteObject--">PortableRemoteObject</a></span>()</code>
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<div class="block">
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通过调用
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<code>exportObject(this)</code>对象。
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</div> </td>
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</tr>
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</tbody>
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</table> </li>
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</ul>
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<!-- ========== METHOD SUMMARY =========== -->
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<li class="blockList"><a name="method.summary">
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<!-- --> </a> <h3>方法摘要</h3>
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<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
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<caption>
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<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
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<span class="tableTab" id="t1"><span><a href="javascript:show(1);">静态方法</a></span><span class="tabEnd"> </span></span>
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<span class="tableTab" id="t4"><span><a href="javascript:show(8);">具体的方法</a></span><span class="tabEnd"> </span></span>
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</caption>
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<tbody>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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</tr>
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<tr class="altColor" id="i0">
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/rmi/PortableRemoteObject.html#connect-java.rmi.Remote-java.rmi.Remote-">connect</a></span>(<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> target, <a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> source)</code>
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<div class="block">
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使远程对象准备好进行远程通信。
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</div> </td>
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</tr>
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<tr class="rowColor" id="i1">
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/rmi/PortableRemoteObject.html#exportObject-java.rmi.Remote-">exportObject</a></span>(<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> obj)</code>
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<div class="block">
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使服务器对象准备好接收远程调用。
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</div> </td>
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</tr>
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<tr class="altColor" id="i2">
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<td class="colFirst"><code>static <a href="../../java/lang/Object.html" title="class in java.lang">Object</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/rmi/PortableRemoteObject.html#narrow-java.lang.Object-java.lang.Class-">narrow</a></span>(<a href="../../java/lang/Object.html" title="class in java.lang">Object</a> narrowFrom, <a href="../../java/lang/Class.html" title="class in java.lang">类</a> narrowTo)</code>
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<div class="block">
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检查以确保远程或抽象接口类型的对象可以转换为所需类型。
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</div> </td>
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</tr>
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<tr class="rowColor" id="i3">
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<td class="colFirst"><code>static <a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/rmi/PortableRemoteObject.html#toStub-java.rmi.Remote-">toStub</a></span>(<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> obj)</code>
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<div class="block">
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返回给定服务器对象的存根。
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</div> </td>
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</tr>
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<tr class="altColor" id="i4">
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/rmi/PortableRemoteObject.html#unexportObject-java.rmi.Remote-">unexportObject</a></span>(<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> obj)</code>
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<div class="block">
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从运行时取消注册服务器对象，允许对象可用于垃圾回收。
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</div> </td>
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</tr>
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</tbody>
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</table>
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<ul class="blockList">
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<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
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<!-- --> </a> <h3>Methods inherited from class java.lang.<a href="../../java/lang/Object.html" title="class in java.lang">Object</a></h3> <code><a href="../../java/lang/Object.html#clone--">clone</a>, <a href="../../java/lang/Object.html#equals-java.lang.Object-">equals</a>, <a href="../../java/lang/Object.html#finalize--">finalize</a>, <a href="../../java/lang/Object.html#getClass--">getClass</a>, <a href="../../java/lang/Object.html#hashCode--">hashCode</a>, <a href="../../java/lang/Object.html#notify--">notify</a>, <a href="../../java/lang/Object.html#notifyAll--">notifyAll</a>, <a href="../../java/lang/Object.html#toString--">toString</a>, <a href="../../java/lang/Object.html#wait--">wait</a>, <a href="../../java/lang/Object.html#wait-long-">wait</a>, <a href="../../java/lang/Object.html#wait-long-int-">wait</a></code></li>
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</ul> </li>
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</ul> </li>
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</ul>
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</div>
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<div class="details">
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<li class="blockList"><a name="constructor.detail">
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<!-- --> </a> <h3>构造方法详细信息</h3> <a name="PortableRemoteObject--">
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<ul class="blockListLast">
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<li class="blockList"> <h4>PortableRemoteObject</h4> <pre>protected PortableRemoteObject()
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throws <a href="../../java/rmi/RemoteException.html" title="class in java.rmi">RemoteException</a></pre>
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<div class="block">
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通过调用
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<code>exportObject(this)</code>来
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<code>exportObject(this)</code>对象。
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</div>
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<dl>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../java/rmi/RemoteException.html" title="class in java.rmi">RemoteException</a></code> - 如果导出失败。
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</dd>
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</dl> </li>
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</ul> </li>
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</ul>
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<!-- ============ METHOD DETAIL ========== -->
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<ul class="blockList">
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<li class="blockList"><a name="method.detail">
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<!-- --> </a> <h3>方法详细信息</h3> <a name="exportObject-java.rmi.Remote-">
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<ul class="blockList">
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<li class="blockList"> <h4>exportObject</h4> <pre>public static void exportObject(<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> obj)
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throws <a href="../../java/rmi/RemoteException.html" title="class in java.rmi">RemoteException</a></pre>
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<div class="block">
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<span>使服务器对象准备好接收远程调用。</span>
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<span>请注意，PortableRemoteObject的子类不需要调用此方法，因为它由构造函数调用。</span>
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>obj</code> - 要导出的服务器对象。
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../java/rmi/RemoteException.html" title="class in java.rmi">RemoteException</a></code> - 如果导出失败。
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</dd>
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</dl> </li>
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</ul> <a name="toStub-java.rmi.Remote-">
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<ul class="blockList">
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<li class="blockList"> <h4>toStub</h4> <pre>public static <a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> toStub(<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> obj)
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throws <a href="../../java/rmi/NoSuchObjectException.html" title="class in java.rmi">NoSuchObjectException</a></pre>
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<div class="block">
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返回给定服务器对象的存根。
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<span><code>obj</code> - 需要存根的服务器对象。</span>
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<span>必须是PortableRemoteObject的一个子类，或者以前被呼叫的目标<a href="../../javax/rmi/PortableRemoteObject.html#exportObject-java.rmi.Remote-"><code>exportObject(java.rmi.Remote)</code></a> 。</span>
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</dd>
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<dt>
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<span class="returnLabel">结果</span>
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</dt>
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<dd>
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对象的最导出的存根。
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../java/rmi/NoSuchObjectException.html" title="class in java.rmi">NoSuchObjectException</a></code> - 如果无法为给定的服务器对象找到存根。
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</dd>
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</dl> </li>
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</ul> <a name="unexportObject-java.rmi.Remote-">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>unexportObject</h4> <pre>public static void unexportObject(<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> obj)
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throws <a href="../../java/rmi/NoSuchObjectException.html" title="class in java.rmi">NoSuchObjectException</a></pre>
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<div class="block">
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从运行时取消注册服务器对象，允许对象可用于垃圾回收。
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>obj</code> - 要取消导出的对象。
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../java/rmi/NoSuchObjectException.html" title="class in java.rmi">NoSuchObjectException</a></code> - 如果远程对象当前未导出。
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</dd>
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</dl> </li>
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</ul> <a name="narrow-java.lang.Object-java.lang.Class-">
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<!-- --> </a>
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<ul class="blockList">
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<li class="blockList"> <h4>narrow</h4> <pre>public static <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> narrow(<a href="../../java/lang/Object.html" title="class in java.lang">Object</a> narrowFrom,
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<a href="../../java/lang/Class.html" title="class in java.lang">类</a> narrowTo)
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throws <a href="../../java/lang/ClassCastException.html" title="class in java.lang">ClassCastException</a></pre>
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<div class="block">
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检查以确保远程或抽象接口类型的对象可以转换为所需类型。
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>narrowFrom</code> - 要检查的对象。
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</dd>
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<dd>
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<code>narrowTo</code> - 所需类型。
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</dd>
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<dt>
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<span class="returnLabel">结果</span>
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</dt>
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<dd>
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可以将其投射到所需类型的对象。
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../java/lang/ClassCastException.html" title="class in java.lang">ClassCastException</a></code> - 如果narrowFrom不能被转换为narrowTo。
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</dd>
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</dl> </li>
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</ul> <a name="connect-java.rmi.Remote-java.rmi.Remote-">
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<ul class="blockListLast">
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<li class="blockList"> <h4>connect</h4> <pre>public static void connect(<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> target,
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<a href="../../java/rmi/Remote.html" title="interface in java.rmi">Remote</a> source)
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throws <a href="../../java/rmi/RemoteException.html" title="class in java.rmi">RemoteException</a></pre>
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<div class="block">
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<span>使远程对象准备好进行远程通信。</span>
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<span>这通常在对象作为远程方法调用的参数发送或接收时隐含发生，但在某些情况下，通过进行显式调用来执行此操作是有用的。</span>
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<span>有关详细信息，请参阅<a href="../../javax/rmi/CORBA/Stub.html#connect-org.omg.CORBA.ORB-"><code>Stub.connect(org.omg.CORBA.ORB)</code></a>方法。</span>
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</div>
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<dl>
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<dt>
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<span class="paramLabel">参数</span>
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</dt>
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<dd>
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<code>target</code> - 要连接的对象。
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</dd>
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<dd>
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<code>source</code> - 以前连接的对象。
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</dd>
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<dt>
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<span class="throwsLabel">异常</span>
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</dt>
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<dd>
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<code><a href="../../java/rmi/RemoteException.html" title="class in java.rmi">RemoteException</a></code> - 如果
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<code>source</code>未连接或
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<code>target</code>已经连接到不同的ORB比
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<code>source</code> 。
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</dd>
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</dl> </li>
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</ul> </li>
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</ul> </li>
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</ul>
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</div>
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