uTools-Manuals/docs/java/javax/activation/CommandInfo.html

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     javax.activation 
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<h2 class="title" title="Class CommandInfo">Class CommandInfo</h2>
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<hr/> <br/> <pre>public class <span class="typeNameLabel">CommandInfo</span>
extends <a href="../../java/lang/Object.html" title="class in java.lang">Object</a></pre>
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<span>CommandMap实现使用CommandInfo类来描述命令请求的结果。</span>
<span>它向请求者提供请求的动词以及bean的实例。</span>
<span>还有一种方法将返回实现该命令的类的名称，但<i>不能保证返回有效的值</i> 。</span>
<span>这样做的原因是允许CommandMap的子类CommandMap中的CommandMap隐含提供特殊的行为。</span>
<span>例如，CommandMap可以动态生成JavaBean。</span>
<span>在这种情况下，可能无法仅从类名称创建具有所有正确状态信息的对象。</span>
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<span class="simpleTagLabel">从以下版本开始：</span>
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         1.6 
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<span>构造方法</span>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../javax/activation/CommandInfo.html#CommandInfo-java.lang.String-java.lang.String-">CommandInfo</a></span>(<a href="../../java/lang/String.html" title="class in java.lang">String</a> verb, <a href="../../java/lang/String.html" title="class in java.lang">String</a> className)</code>
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              CommandInfo的构造方法。 
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<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
<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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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code><a href="../../java/lang/String.html" title="class in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/CommandInfo.html#getCommandClass--">getCommandClass</a></span>()</code>
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              返回命令的类名。 
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<td class="colFirst"><code><a href="../../java/lang/String.html" title="class in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/CommandInfo.html#getCommandName--">getCommandName</a></span>()</code>
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              返回命令动词。 
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<td class="colFirst"><code><a href="../../java/lang/Object.html" title="class in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/CommandInfo.html#getCommandObject-javax.activation.DataHandler-java.lang.ClassLoader-">getCommandObject</a></span>(<a href="../../javax/activation/DataHandler.html" title="class in javax.activation">DataHandler</a> dh, <a href="../../java/lang/ClassLoader.html" title="class in java.lang">ClassLoader</a> loader)</code>
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              返回实例化的JavaBean组件。 
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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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<li class="blockList"> <h4>CommandInfo</h4> <pre>public CommandInfo(<a href="../../java/lang/String.html" title="class in java.lang">String</a> verb,
                   <a href="../../java/lang/String.html" title="class in java.lang">String</a> className)</pre>
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            CommandInfo的构造方法。 
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<span class="paramLabel">参数</span>
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<code>verb</code> - 
            <code>verb</code>的命令动词。 
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<code>className</code> - 命令的全限定类名。 
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<li class="blockList"> <h4>getCommandName</h4> <pre>public <a href="../../java/lang/String.html" title="class in java.lang">String</a> getCommandName()</pre>
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            返回命令动词。 
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<span class="returnLabel">结果</span>
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             命令动词。 
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<li class="blockList"> <h4>getCommandClass</h4> <pre>public <a href="../../java/lang/String.html" title="class in java.lang">String</a> getCommandClass()</pre>
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<span>返回命令的类名。</span>
<span><i>这个方法可以在CommandMap子类CommandInfo为其自身目的的情况下返回null。</i></span>
<span>换句话说，可能无法通过仅知道其类名称在命令中创建正确的状态。</span>
<span><b>不要依赖此方法返回有效值！</b></span>
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<span class="returnLabel">结果</span>
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             命令的类名，或 
            <i>null</i>
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<li class="blockList"> <h4>getCommandObject</h4> <pre>public <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> getCommandObject(<a href="../../javax/activation/DataHandler.html" title="class in javax.activation">DataHandler</a> dh,
                               <a href="../../java/lang/ClassLoader.html" title="class in java.lang">ClassLoader</a> loader)
                        throws <a href="../../java/io/IOException.html" title="class in java.io">IOException</a>,
                               <a href="../../java/lang/ClassNotFoundException.html" title="class in java.lang">ClassNotFoundException</a></pre>
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<span>返回实例化的JavaBean组件。</span>
<p> <span>首先用Beans.instantiate()实例化<code>Beans.instantiate()</code> 。</span> </p>
<p> <span>如果bean实现了<code>javax.activation.CommandObject</code>接口，请调用其<code>setCommandContext</code>方法。</span> </p>
<p> <span>如果DataHandler参数为空，那么该bean将被实例化，没有数据。</span> <span>注意：如果由于某种原因，当该方法尝试访问其InputStream时，传递的DataHandler会抛出IOExceptions，这可能很有用。</span> <span>它将允许调用者检索对bean的引用，如果它可以被实例化。</span> </p>
<p> <span>如果bean不实现CommandObject接口，则此方法将检查它是否实现了java.io.Externalizable接口。</span> <span>如果是这样，如果可以从DataHandler获取InputStream，那么bean的readExternal方法将被调用。</span> </p>
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<span class="paramLabel">参数</span>
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<code>dh</code> - 描述要传递给命令的数据的DataHandler。 
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<code>loader</code> - 用于实例化bean的ClassLoader。 
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<span class="returnLabel">结果</span>
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             豆 
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<span class="throwsLabel">异常</span>
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<code><a href="../../java/io/IOException.html" title="class in java.io">IOException</a></code>
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<code><a href="../../java/lang/ClassNotFoundException.html" title="class in java.lang">ClassNotFoundException</a></code>
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<span class="seeLabel">另请参见：</span>
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<span><a href="../../java/beans/Beans.html#instantiate-java.lang.ClassLoader-java.lang.String-"><code>Beans.instantiate(java.lang.ClassLoader, java.lang.String)</code></a> ， <a href="../../javax/activation/CommandObject.html" title="javax.activation中的接口"><code>CommandObject</code></a></span>
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