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

<div class="header">
<div class="subTitle">
     javax.activation 
   </div>
<h2 class="title" title="Class DataHandler">Class DataHandler</h2>
</div><div class="contentContainer">
<ul class="inheritance">
<li><a href="../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li>javax.activation.DataHandler</li>
</ul> </li>
</ul>
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt>
         All Implemented Interfaces: 
       </dt>
<dd>
<span><a href="../../java/awt/datatransfer/Transferable.html" title="java.awt.datatransfer中的接口">Transferable</a></span>
</dd>
</dl>
<hr/> <br/> <pre>public class <span class="typeNameLabel">DataHandler</span>
extends <a href="../../java/lang/Object.html" title="class in java.lang">Object</a>
implements <a href="../../java/awt/datatransfer/Transferable.html" title="interface in java.awt.datatransfer">Transferable</a></pre>
<div class="block">
<span>DataHandler类为许多不同来源和格式的数据提供了一致的界面。</span>
<span>它使用DataContentHandlers管理简单的流到字符串转换和相关操作。</span>
<span>它提供对可以对数据操作的命令的访问。</span>
<span>命令是使用CommandMap找到的。</span>
<p> <span><b>DataHandler和可传输接口</b></span> </p>
<p> <span>DataHandler实现了可传输接口，以便数据可用于AWT数据传输操作，如剪切和粘贴和拖放。</span> <span>Transferable接口的实现依赖于与DataHandler的特定实例中表示的数据的MIME类型相对应的已安装DataContentHandler对象的可用性。</span> </p>
<p> <span><b>DataHandler和CommandMaps</b></span> </p>
<p> <span>DataHandler在跟踪它使用为命令（服务请求当前的CommandMap的<code>getCommand</code> ， <code>getAllCommands</code> ， <code>getPreferredCommands</code> ）。</span> <span>DataHandler的每个实例可能都有一个与它相关联的CommandMap，使用<code>setCommandMap</code>方法。</span> <span>如果没有设置CommandMap，DataHandler会在<code>getDefaultCommandMap</code>中调用<code>getDefaultCommandMap</code>方法，并使用它返回的值。</span> <span>见<i>的CommandMap</i>以获取更多信息。</span> </p>
<p> <span><b>DataHandler和URL</b></span> </p>
<p> <span>当使用URL构造时，当前的DataHandler实现创建一个URLDataSource的私有实例。</span> </p>
</div>
<dl>
<dt>
<span class="simpleTagLabel">从以下版本开始：</span>
</dt>
<dd>
         1.6 
       </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<span><a href="../../javax/activation/CommandMap.html" title="javax.activation中的类"><code>CommandMap</code></a> ， <a href="../../javax/activation/DataContentHandler.html" title="javax.activation中的接口"><code>DataContentHandler</code></a> ， <a href="../../javax/activation/DataSource.html" title="javax.activation中的接口"><code>DataSource</code></a> ， <a href="../../javax/activation/URLDataSource.html" title="javax.activation中的类"><code>URLDataSource</code></a></span>
</dd>
</dl> </li>
</ul>
</div>
<div class="summary">
<ul class="blockList">
<li class="blockList">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<ul class="blockList">
<li class="blockList"><a name="constructor.summary">
<!-- --> </a> <h3>构造方法摘要</h3>
<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Constructor Summary table, listing constructors, and an explanation">
<caption>
<span>构造方法</span>
<span class="tabEnd"> </span>
</caption>
<tbody>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#DataHandler-javax.activation.DataSource-">DataHandler</a></span>(<a href="../../javax/activation/DataSource.html" title="interface in javax.activation">DataSource</a> ds)</code>
<div class="block">
              创建引用指定的DataSource的 
             <code>DataHandler</code>实例。 
            </div> </td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#DataHandler-java.lang.Object-java.lang.String-">DataHandler</a></span>(<a href="../../java/lang/Object.html" title="class in java.lang">Object</a> obj, <a href="../../java/lang/String.html" title="class in java.lang">String</a> mimeType)</code>
<div class="block">
              创建一个 
             <code>DataHandler</code>此MIME类型对象的 
             <code>DataHandler</code>实例。 
            </div> </td>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#DataHandler-java.net.URL-">DataHandler</a></span>(<a href="../../java/net/URL.html" title="class in java.net">URL</a> url)</code>
<div class="block">
              创建引用URL的 
             <code>DataHandler</code>实例。 
            </div> </td>
</tr>
</tbody>
</table> </li>
</ul>
<!-- ========== METHOD SUMMARY =========== -->
<ul class="blockList">
<li class="blockList"><a name="method.summary">
<!-- --> </a> <h3>方法摘要</h3>
<table border="0" cellpadding="3" cellspacing="0" class="memberSummary" summary="Method Summary table, listing methods, and an explanation">
<caption>
<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t1"><span><a href="javascript:show(1);">静态方法</a></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>
</caption>
<tbody>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor" id="i0">
<td class="colFirst"><code><a href="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#getAllCommands--">getAllCommands</a></span>()</code>
<div class="block">
              返回此类型数据的所有命令。 
            </div> </td>
</tr>
<tr class="rowColor" id="i1">
<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/DataHandler.html#getBean-javax.activation.CommandInfo-">getBean</a></span>(<a href="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</a> cmdinfo)</code>
<div class="block">
              一个方便的方法，它接受CommandInfo对象并实例化相应的命令，通常是一个JavaBean组件。 
            </div> </td>
</tr>
<tr class="altColor" id="i2">
<td class="colFirst"><code><a href="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#getCommand-java.lang.String-">getCommand</a></span>(<a href="../../java/lang/String.html" title="class in java.lang">String</a> cmdName)</code>
<div class="block">
              获取命令 
             <i>cmdName</i> 。 
            </div> </td>
</tr>
<tr class="rowColor" id="i3">
<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/DataHandler.html#getContent--">getContent</a></span>()</code>
<div class="block">
              以其首选对象形式返回数据。 
            </div> </td>
</tr>
<tr class="altColor" id="i4">
<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/DataHandler.html#getContentType--">getContentType</a></span>()</code>
<div class="block">
              返回从源对象检索的此对象的MIME类型。 
            </div> </td>
</tr>
<tr class="rowColor" id="i5">
<td class="colFirst"><code><a href="../../javax/activation/DataSource.html" title="interface in javax.activation">DataSource</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#getDataSource--">getDataSource</a></span>()</code>
<div class="block">
              返回与此DataHandler实例关联的DataSource。 
            </div> </td>
</tr>
<tr class="altColor" id="i6">
<td class="colFirst"><code><a href="../../java/io/InputStream.html" title="class in java.io">InputStream</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#getInputStream--">getInputStream</a></span>()</code>
<div class="block">
              获取此对象的InputStream。 
            </div> </td>
</tr>
<tr class="rowColor" id="i7">
<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/DataHandler.html#getName--">getName</a></span>()</code>
<div class="block">
              返回数据对象的名称。 
            </div> </td>
</tr>
<tr class="altColor" id="i8">
<td class="colFirst"><code><a href="../../java/io/OutputStream.html" title="class in java.io">OutputStream</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#getOutputStream--">getOutputStream</a></span>()</code>
<div class="block">
              获取此DataHandler的OutputStream以允许覆盖底层数据。 
            </div> </td>
</tr>
<tr class="rowColor" id="i9">
<td class="colFirst"><code><a href="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#getPreferredCommands--">getPreferredCommands</a></span>()</code>
<div class="block">
              返回此类型数据的 
             <i>首选</i>命令。 
            </div> </td>
</tr>
<tr class="altColor" id="i10">
<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/DataHandler.html#getTransferData-java.awt.datatransfer.DataFlavor-">getTransferData</a></span>(<a href="../../java/awt/datatransfer/DataFlavor.html" title="class in java.awt.datatransfer">DataFlavor</a> flavor)</code>
<div class="block">
              返回表示要传输的数据的对象。 
            </div> </td>
</tr>
<tr class="rowColor" id="i11">
<td class="colFirst"><code><a href="../../java/awt/datatransfer/DataFlavor.html" title="class in java.awt.datatransfer">DataFlavor</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#getTransferDataFlavors--">getTransferDataFlavors</a></span>()</code>
<div class="block">
              返回此数据可用的DataFlavors。 
            </div> </td>
</tr>
<tr class="altColor" id="i12">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#isDataFlavorSupported-java.awt.datatransfer.DataFlavor-">isDataFlavorSupported</a></span>(<a href="../../java/awt/datatransfer/DataFlavor.html" title="class in java.awt.datatransfer">DataFlavor</a> flavor)</code>
<div class="block">
              返回此对象是否支持指定的数据flavor。 
            </div> </td>
</tr>
<tr class="rowColor" id="i13">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#setCommandMap-javax.activation.CommandMap-">setCommandMap</a></span>(<a href="../../javax/activation/CommandMap.html" title="class in javax.activation">CommandMap</a> commandMap)</code>
<div class="block">
              设置CommandMap以供DataHandler使用。 
            </div> </td>
</tr>
<tr class="altColor" id="i14">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#setDataContentHandlerFactory-javax.activation.DataContentHandlerFactory-">setDataContentHandlerFactory</a></span>(<a href="../../javax/activation/DataContentHandlerFactory.html" title="interface in javax.activation">DataContentHandlerFactory</a> newFactory)</code>
<div class="block">
              设置DataContentHandlerFactory。 
            </div> </td>
</tr>
<tr class="rowColor" id="i15">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/activation/DataHandler.html#writeTo-java.io.OutputStream-">writeTo</a></span>(<a href="../../java/io/OutputStream.html" title="class in java.io">OutputStream</a> os)</code>
<div class="block">
              将数据写入 
             <code>OutputStream</code> 。 
            </div> </td>
</tr>
</tbody>
</table>
<ul class="blockList">
<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
<!-- --> </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>
</ul> </li>
</ul> </li>
</ul>
</div>
<div class="details">
<ul class="blockList">
<li class="blockList">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<ul class="blockList">
<li class="blockList"><a name="constructor.detail">
<!-- --> </a> <h3>构造方法详细信息</h3> <a name="DataHandler-javax.activation.DataSource-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>DataHandler</h4> <pre>public DataHandler(<a href="../../javax/activation/DataSource.html" title="interface in javax.activation">DataSource</a> ds)</pre>
<div class="block">
<span>创建引用指定的DataSource的<code>DataHandler</code>实例。</span>
<span>数据以字节流形式存在。</span>
<span>DataSource将提供一个InputStream来访问数据。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>ds</code> - DataSource 
           </dd>
</dl> </li>
</ul> <a name="DataHandler-java.lang.Object-java.lang.String-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>DataHandler</h4> <pre>public DataHandler(<a href="../../java/lang/Object.html" title="class in java.lang">Object</a> obj,
                   <a href="../../java/lang/String.html" title="class in java.lang">String</a> mimeType)</pre>
<div class="block">
<span>创建一个<code>DataHandler</code>此MIME类型对象的<code>DataHandler</code>实例。</span>
<span>当应用程序已经具有Java对象形式的数据的内存中表示时，将使用此构造函数。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>obj</code> - Java对象 
           </dd>
<dd>
<code>mimeType</code> - 对象的MIME类型 
           </dd>
</dl> </li>
</ul> <a name="DataHandler-java.net.URL-">
<!-- --> </a>
<ul class="blockListLast">
<li class="blockList"> <h4>DataHandler</h4> <pre>public DataHandler(<a href="../../java/net/URL.html" title="class in java.net">URL</a> url)</pre>
<div class="block">
<span>创建引用URL的<code>DataHandler</code>实例。</span>
<span>DataHandler内部创建一个<code>URLDataSource</code>实例来表示URL。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>url</code> - 一个URL对象 
           </dd>
</dl> </li>
</ul> </li>
</ul>
<!-- ============ METHOD DETAIL ========== -->
<ul class="blockList">
<li class="blockList"><a name="method.detail">
<!-- --> </a> <h3>方法详细信息</h3> <a name="getDataSource--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getDataSource</h4> <pre>public <a href="../../javax/activation/DataSource.html" title="interface in javax.activation">DataSource</a> getDataSource()</pre>
<div class="block">
<span>返回与此DataHandler实例关联的DataSource。</span>
<p> <span>对于已使用DataSource实例化的DataHandler，此方法返回用于创建DataHandler对象的DataSource。</span> <span>在其他情况下，DataHandler根据用于构造DataHandler的数据构建DataSource。</span> <span>为DataHandler创建的DataSource <b>未</b>实例化DataSource为缓存高性能的原因。</span> </p>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             此DataHandler的有效DataSource对象 
           </dd>
</dl> </li>
</ul> <a name="getName--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getName</h4> <pre>public <a href="../../java/lang/String.html" title="class in java.lang">String</a> getName()</pre>
<div class="block">
<span>返回数据对象的名称。</span>
<span>如果该DataHandler是使用DataSource创建的，则该方法调用到<code>DataSource.getName</code>方法，否则返回<i>null</i> 。</span>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             对象的名称 
           </dd>
</dl> </li>
</ul> <a name="getContentType--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getContentType</h4> <pre>public <a href="../../java/lang/String.html" title="class in java.lang">String</a> getContentType()</pre>
<div class="block">
<span>返回从源对象检索的此对象的MIME类型。</span>
<span>请注意，这是具有参数的<i>完整</i>类型。</span>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             MIME类型 
           </dd>
</dl> </li>
</ul> <a name="getInputStream--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getInputStream</h4> <pre>public <a href="../../java/io/InputStream.html" title="class in java.io">InputStream</a> getInputStream()
                           throws <a href="../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span>获取此对象的InputStream。</span>
<p> <span>对于使用DataSource实例化的DataHandler，DataHandler调用<code>DataSource.getInputStream</code>方法并将结果返回给调用者。</span> </p>
<p> <span>对于使用Object实例化的DataHandler，DataHandler首先尝试为对象找到一个DataContentHandler。</span> <span>如果DataHandler找不到此MIME类型的DataContentHandler，则会引发UnsupportedDataTypeException。</span> <span>如果成功，它将创建一个管道和一个线程。</span> <span>线程使用DataContentHandler的<code>writeTo</code>方法将流数据写入管道的一端。</span> <span>管道的另一端返回给调用者。</span> <span>由于创建线程以复制数据，因此在复制期间可能发生的IOExceptions无法传播回调用者。</span> <span>结果是一个空的流。</span> </p>
<p></p>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             InputStream表示此数据 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果发生I / O错误 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<span><a href="../../javax/activation/DataContentHandler.html#writeTo-java.lang.Object-java.lang.String-java.io.OutputStream-"><code>DataContentHandler.writeTo(java.lang.Object, java.lang.String, java.io.OutputStream)</code></a> ， <a href="../../javax/activation/UnsupportedDataTypeException.html" title="javax.activation中的类"><code>UnsupportedDataTypeException</code></a></span>
</dd>
</dl> </li>
</ul> <a name="writeTo-java.io.OutputStream-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>writeTo</h4> <pre>public void writeTo(<a href="../../java/io/OutputStream.html" title="class in java.io">OutputStream</a> os)
             throws <a href="../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span>将数据写入<code>OutputStream</code> 。</span>
<p> <span>如果DataHandler是使用DataSource创建的，writeTo将检索InputStream，并将InputStream中的字节复制到传入的OutputStream。</span> </p>
<p> <span>如果DataHandler是使用对象创建的，writeTo将检索对象类型的DataContentHandler。</span> <span>如果的DataContentHandler被发现，它调用<code>writeTo</code>的方法<code>DataContentHandler</code> 。</span> </p>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>os</code> - 要写入的OutputStream 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果发生I / O错误 
           </dd>
</dl> </li>
</ul> <a name="getOutputStream--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getOutputStream</h4> <pre>public <a href="../../java/io/OutputStream.html" title="class in java.io">OutputStream</a> getOutputStream()
                             throws <a href="../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span>获取此DataHandler的OutputStream以允许覆盖底层数据。</span>
<span>如果DataHandler是用DataSource创建的，则调用DataSource的<code>getOutputStream</code>方法。</span>
<span>否则返回<code>null</code> 。</span>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             OutputStream 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../java/io/IOException.html" title="class in java.io">IOException</a></code>
</dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<span><a href="../../javax/activation/DataSource.html#getOutputStream--"><code>DataSource.getOutputStream()</code></a> ， <a href="../../javax/activation/URLDataSource.html" title="javax.activation中的类"><code>URLDataSource</code></a></span>
</dd>
</dl> </li>
</ul> <a name="getTransferDataFlavors--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getTransferDataFlavors</h4> <pre>public <a href="../../java/awt/datatransfer/DataFlavor.html" title="class in java.awt.datatransfer">DataFlavor</a>[] getTransferDataFlavors()</pre>
<div class="block">
<span>返回此数据可用的DataFlavors。</span>
<p> <span>返回一个DataFlavor对象数组，表示可以提供数据的风格。数组通常根据提供数据的偏好进行排序，从最丰富的描述到最不丰富的描述。</span> </p>
<p> <span>DataHandler尝试查找与数据的MIME类型相对应的DataContentHandler。</span> <span>如果找到，DataHandler会调用DataContentHandler的<code>getTransferDataFlavors</code>方法。</span> </p>
<p> <span>如果<i>无法</i>找到DataContentHandler，并且如果使用DataSource（或URL）创建了DataHandler，则会返回一个表示此对象的MIME类型和<code>java.io.InputStream</code>类的<code>java.io.InputStream</code> 。</span> <span>如果使用对象和MIME类型创建了DataHandler，那么getTransferDataFlavors将返回一个表示此对象的MIME类型和对象类的DataFlavor。</span> </p>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../java/awt/datatransfer/Transferable.html#getTransferDataFlavors--">getTransferDataFlavors</a></code>在界面 
            <code><a href="../../java/awt/datatransfer/Transferable.html" title="interface in java.awt.datatransfer">Transferable</a></code>
</dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             一系列可以传输此数据的数据风格 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/activation/DataContentHandler.html#getTransferDataFlavors--"><code>DataContentHandler.getTransferDataFlavors()</code></a>
</dd>
</dl> </li>
</ul> <a name="isDataFlavorSupported-java.awt.datatransfer.DataFlavor-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>isDataFlavorSupported</h4> <pre>public boolean isDataFlavorSupported(<a href="../../java/awt/datatransfer/DataFlavor.html" title="class in java.awt.datatransfer">DataFlavor</a> flavor)</pre>
<div class="block">
<span>返回此对象是否支持指定的数据flavor。</span>
<p> <span>该方法遍历从getTransferDataFlavors返回的<code>getTransferDataFlavors</code> ，将每个与指定的风味进行比较。</span> </p>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../java/awt/datatransfer/Transferable.html#isDataFlavorSupported-java.awt.datatransfer.DataFlavor-">isDataFlavorSupported</a></code>在界面 
            <code><a href="../../java/awt/datatransfer/Transferable.html" title="interface in java.awt.datatransfer">Transferable</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>flavor</code> - 数据所需的风味 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             如果支持数据风格，则为true 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/activation/DataHandler.html#getTransferDataFlavors--"><code>getTransferDataFlavors()</code></a>
</dd>
</dl> </li>
</ul> <a name="getTransferData-java.awt.datatransfer.DataFlavor-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getTransferData</h4> <pre>public <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> getTransferData(<a href="../../java/awt/datatransfer/DataFlavor.html" title="class in java.awt.datatransfer">DataFlavor</a> flavor)
                       throws <a href="../../java/awt/datatransfer/UnsupportedFlavorException.html" title="class in java.awt.datatransfer">UnsupportedFlavorException</a>,
                              <a href="../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span>返回表示要传输的数据的对象。</span>
<span>返回的对象的类由数据风格的表示类定义。</span>
<p> <span><b>对于使用DataSources或URL创建的DataHandler：</b></span> </p>
<p> <span>DataHandler尝试为此MIME类型定位DataContentHandler。</span> <span>如果找到，则DataFlavor中传递的数据和数据类型将传递给其<code>getTransferData</code>方法。</span> <span>如果DataHandler找不到DataContentHandler，并且flavor指定了此对象的MIME类型和<code>java.io.InputStream</code>类，则返回此对象的InputStream。</span> <span>否则会引发UnsupportedFlavorException。</span> </p>
<p> <span><b>对于使用对象创建的DataHandler：</b></span> </p>
<p> <span>DataHandler尝试为此MIME类型定位DataContentHandler。</span> <span>如果找到，则DataFlavor中传递的数据和数据类型将传递给其getTransferData方法。</span> <span>如果DataHandler找不到DataContentHandler，并且flavor指定此对象的MIME类型及其类，则会返回此DataHandler的引用对象。</span> <span>否则会引发UnsupportedFlavorException。</span> </p>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../java/awt/datatransfer/Transferable.html#getTransferData-java.awt.datatransfer.DataFlavor-">getTransferData</a></code>在界面 
            <code><a href="../../java/awt/datatransfer/Transferable.html" title="interface in java.awt.datatransfer">Transferable</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>flavor</code> - 数据所要求的风味 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             物体 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../java/awt/datatransfer/UnsupportedFlavorException.html" title="class in java.awt.datatransfer">UnsupportedFlavorException</a></code> - 如果数据无法转换为请求的风味 
           </dd>
<dd>
<code><a href="../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果发生I / O错误 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<span><a href="../../javax/activation/ActivationDataFlavor.html" title="javax.activation中的类"><code>ActivationDataFlavor</code></a></span>
</dd>
</dl> </li>
</ul> <a name="setCommandMap-javax.activation.CommandMap-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>setCommandMap</h4> <pre>public void setCommandMap(<a href="../../javax/activation/CommandMap.html" title="class in javax.activation">CommandMap</a> commandMap)</pre>
<div class="block">
<span>设置CommandMap以供DataHandler使用。</span>
<span>将其设置为<code>null</code>会导致CommandMap恢复为<code>CommandMap.getDefaultCommandMap</code>方法返回的<code>CommandMap.getDefaultCommandMap</code> 。</span>
<span>更改CommandMap或将其设置为<code>null</code> ，将清除从上一个CommandMap缓存的任何数据。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>commandMap</code> - 要在此DataHandler中使用的CommandMap 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/activation/CommandMap.html#setDefaultCommandMap-javax.activation.CommandMap-"><code>CommandMap.setDefaultCommandMap(javax.activation.CommandMap)</code></a>
</dd>
</dl> </li>
</ul> <a name="getPreferredCommands--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getPreferredCommands</h4> <pre>public <a href="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</a>[] getPreferredCommands()</pre>
<div class="block">
<span>返回此类型数据的<i>首选</i>命令。</span>
<span>此方法调用<code>getPreferredCommands</code>与此DataHandler实例关联的方法的CommandMap。</span>
<span>此方法返回一个表示可用命令子集的数组。</span>
<span>在存在由DataHandler表示的MIME类型的多个命令的情况下，安装的CommandMap将选择相应的命令。</span>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             表示首选命令的CommandInfo对象 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/activation/CommandMap.html#getPreferredCommands-java.lang.String-"><code>CommandMap.getPreferredCommands(java.lang.String)</code></a>
</dd>
</dl> </li>
</ul> <a name="getAllCommands--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getAllCommands</h4> <pre>public <a href="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</a>[] getAllCommands()</pre>
<div class="block">
<span>返回此类型数据的所有命令。</span>
<span>此方法返回一个包含此DataHandler表示的数据类型的所有命令的数组。</span>
<span>此DataHandler表示的底层数据的MIME类型用于调用与此DataHandler关联的CommandMap的<code>getAllCommands</code>方法。</span>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             表示所有命令的CommandInfo对象 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/activation/CommandMap.html#getAllCommands-java.lang.String-"><code>CommandMap.getAllCommands(java.lang.String)</code></a>
</dd>
</dl> </li>
</ul> <a name="getCommand-java.lang.String-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getCommand</h4> <pre>public <a href="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</a> getCommand(<a href="../../java/lang/String.html" title="class in java.lang">String</a> cmdName)</pre>
<div class="block">
<span>获取命令<i>cmdName</i> 。</span>
<span>使用由DataHandler中安装的CommandMap定义的搜索语义。</span>
<span>此DataHandler表示的基础数据的MIME类型用于调用与此DataHandler关联的CommandMap的<code>getCommand</code>方法。</span>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>cmdName</code> - 命令名 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             CommandInfo对应于该命令 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../javax/activation/CommandMap.html#getCommand-java.lang.String-java.lang.String-"><code>CommandMap.getCommand(java.lang.String, java.lang.String)</code></a>
</dd>
</dl> </li>
</ul> <a name="getContent--">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getContent</h4> <pre>public <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> getContent()
                  throws <a href="../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span>以其首选对象形式返回数据。</span>
<p> <span>如果使用对象实例化了DataHandler，则返回该对象。</span> </p>
<p> <span>如果DataHandler用DataSource实例化，则此方法使用DataContentHandler返回此DataHandler表示的数据的内容对象。</span> <span>如果没有<code>DataContentHandler</code>可以为这个数据类型可以发现，的DataHandler返回数据的InputStream。</span> </p>
</div>
<dl>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             内容。 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果在此操作期间发生IOException。 
           </dd>
</dl> </li>
</ul> <a name="getBean-javax.activation.CommandInfo-">
<!-- --> </a>
<ul class="blockList">
<li class="blockList"> <h4>getBean</h4> <pre>public <a href="../../java/lang/Object.html" title="class in java.lang">Object</a> getBean(<a href="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</a> cmdinfo)</pre>
<div class="block">
<span>一个方便的方法，它接受CommandInfo对象并实例化相应的命令，通常是一个JavaBean组件。</span>
<p> <span>这种方法调用CommandInfo的<code>getCommandObject</code>方法与<code>ClassLoader</code>用于加载<code>javax.activation.DataHandler</code>类本身。</span> </p>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>cmdinfo</code> - 与命令对应的CommandInfo 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             实例化的命令对象 
           </dd>
</dl> </li>
</ul> <a name="setDataContentHandlerFactory-javax.activation.DataContentHandlerFactory-">
<!-- --> </a>
<ul class="blockListLast">
<li class="blockList"> <h4>setDataContentHandlerFactory</h4> <pre>public static void setDataContentHandlerFactory(<a href="../../javax/activation/DataContentHandlerFactory.html" title="interface in javax.activation">DataContentHandlerFactory</a> newFactory)</pre>
<div class="block">
<span>设置DataContentHandlerFactory。</span>
<span>首先调用DataContentHandlerFactory来查找DataContentHandlers。</span>
<span>DataContentHandlerFactory只能设置一次。</span>
<p> <span>如果DataContentHandlerFactory已经被设置，这个方法会抛出一个错误。</span> </p>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>newFactory</code> - DataContentHandlerFactory 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../java/lang/Error.html" title="class in java.lang">Error</a></code> - 如果工厂已经定义。 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<span><a href="../../javax/activation/DataContentHandlerFactory.html" title="javax.activation中的接口"><code>DataContentHandlerFactory</code></a></span>
</dd>
</dl> </li>
</ul> </li>
</ul> </li>
</ul>
</div>
</div>