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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_14) on Mon Jan 28 05:46:36 PST 2008 --><TITLE>DataHandler (Java EE 5)</TITLE><META NAME="keywords" CONTENT="javax.activation.DataHandler class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="DataHandler (Java EE 5)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../javax/activation/DataContentHandlerFactory.html" title="interface in javax.activation"><B>PREV CLASS</B></A> <A HREF="../../javax/activation/DataSource.html" title="interface in javax.activation"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javax/activation/DataHandler.html" target="_top"><B>FRAMES</B></A> <A HREF="DataHandler.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.activation</FONT><BR>Class DataHandler</H2><PRE><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>javax.activation.DataHandler</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/awt/datatransfer/Transferable.html" title="class or interface in java.awt.datatransfer">Transferable</A></DD></DL><HR><DL><DT><PRE>public class <B>DataHandler</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/awt/datatransfer/Transferable.html" title="class or interface in java.awt.datatransfer">Transferable</A></DL></PRE><P>The DataHandler class provides a consistent interface to data available in many different sources and formats. It manages simple stream to string conversions and related operations using DataContentHandlers. It provides access to commands that can operate on the data. The commands are found using a CommandMap. <p> <b>DataHandler and the Transferable Interface</b><p> DataHandler implements the Transferable interface so that data can be used in AWT data transfer operations, such as cut and paste and drag and drop. The implementation of the Transferable interface relies on the availability of an installed DataContentHandler object corresponding to the MIME type of the data represented in the specific instance of the DataHandler.<p> <b>DataHandler and CommandMaps</b><p> The DataHandler keeps track of the current CommandMap that it uses to service requests for commands (<code>getCommand</code>, <code>getAllCommands</code>, <code>getPreferredCommands</code>). Each instance of a DataHandler may have a CommandMap associated with it using the <code>setCommandMap</code> method. If a CommandMap was not set, DataHandler calls the <code>getDefaultCommandMap</code> method in CommandMap and uses the value it returns. See <i>CommandMap</i> for more information. <p> <b>DataHandler and URLs</b><p> The current DataHandler implementation creates a private instance of URLDataSource when it is constructed with a URL.<P><P><DL><DT><B>See Also:</B><DD><A HREF="../../javax/activation/CommandMap.html" title="class in javax.activation"><CODE>CommandMap</CODE></A>, <A HREF="../../javax/activation/DataContentHandler.html" title="interface in javax.activation"><CODE>DataContentHandler</CODE></A>, <A HREF="../../javax/activation/DataSource.html" title="interface in javax.activation"><CODE>DataSource</CODE></A>, <A HREF="../../javax/activation/URLDataSource.html" title="class in javax.activation"><CODE>URLDataSource</CODE></A></DL><HR><P><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#DataHandler(javax.activation.DataSource)">DataHandler</A></B>(<A HREF="../../javax/activation/DataSource.html" title="interface in javax.activation">DataSource</A> ds)</CODE><BR> Create a <code>DataHandler</code> instance referencing the specified DataSource.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#DataHandler(java.lang.Object, java.lang.String)">DataHandler</A></B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> obj, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> mimeType)</CODE><BR> Create a <code>DataHandler</code> instance representing an object of this MIME type.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#DataHandler(java.net.URL)">DataHandler</A></B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/net/URL.html" title="class or interface in java.net">URL</A> url)</CODE><BR> Create a <code>DataHandler</code> instance referencing a URL.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getAllCommands()">getAllCommands</A></B>()</CODE><BR> Return all the commands for this type of data.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getBean(javax.activation.CommandInfo)">getBean</A></B>(<A HREF="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</A> cmdinfo)</CODE><BR> A convenience method that takes a CommandInfo object and instantiates the corresponding command, usually a JavaBean component.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getCommand(java.lang.String)">getCommand</A></B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> cmdName)</CODE><BR> Get the command <i>cmdName</i>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getContent()">getContent</A></B>()</CODE><BR> Return the data in its preferred Object form.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getContentType()">getContentType</A></B>()</CODE><BR> Return the MIME type of this object as retrieved from the source object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javax/activation/DataSource.html" title="interface in javax.activation">DataSource</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getDataSource()">getDataSource</A></B>()</CODE><BR> Return the DataSource associated with this instance of DataHandler.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/InputStream.html" title="class or interface in java.io">InputStream</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getInputStream()">getInputStream</A></B>()</CODE><BR> Get the InputStream for this object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getName()">getName</A></B>()</CODE><BR> Return the name of the data object.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/OutputStream.html" title="class or interface in java.io">OutputStream</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getOutputStream()">getOutputStream</A></B>()</CODE><BR> Get an OutputStream for this DataHandler to allow overwriting the underlying data.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../javax/activation/CommandInfo.html" title="class in javax.activation">CommandInfo</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getPreferredCommands()">getPreferredCommands</A></B>()</CODE><BR> Return the <i>preferred</i> commands for this type of data.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getTransferData(java.awt.datatransfer.DataFlavor)">getTransferData</A></B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/awt/datatransfer/DataFlavor.html" title="class or interface in java.awt.datatransfer">DataFlavor</A> flavor)</CODE><BR> Returns an object that represents the data to be transferred.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/awt/datatransfer/DataFlavor.html" title="class or interface in java.awt.datatransfer">DataFlavor</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#getTransferDataFlavors()">getTransferDataFlavors</A></B>()</CODE><BR> Return the DataFlavors in which this data is available.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/activation/DataHandler.html#isDataFlavorSupported(java.awt.datatransfer.DataFlavor)">isDataFlavorSupported</A></B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/awt/datatransfer/DataFlavor.html" title="class or interface in java.awt.datatransfer">DataFlavor</A> flavor)</CODE><BR> Returns whether the specified data flavor is supported for this object.</TD></TR>⌨️ 快捷键说明
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