downloadaction.html

struts api,学习使用struts必备的文档

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<CODE>protected &nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DownloadAction.html#getBufferSize()">getBufferSize</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the size of the buffer to be used in transferring the data to
 the servlet output stream.</TD>
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<CODE>protected abstract &nbsp;<A HREF="../../../../org/apache/struts/actions/DownloadAction.StreamInfo.html">DownloadAction.StreamInfo</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/struts/actions/DownloadAction.html#getStreamInfo(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">getStreamInfo</A></B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A>&nbsp;mapping,
              <A HREF="../../../../org/apache/struts/action/ActionForm.html">ActionForm</A>&nbsp;form,
              javax.servlet.http.HttpServletRequest&nbsp;request,
              javax.servlet.http.HttpServletResponse&nbsp;response)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the information on the file, or other stream, to be downloaded
 by this action.</TD>
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</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_org.apache.struts.action.Action"><!-- --></A>
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<TD><B>Methods inherited from class org.apache.struts.action.<A HREF="../../../../org/apache/struts/action/Action.html">Action</A></B></TD>
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<TD><CODE><A HREF="../../../../org/apache/struts/action/Action.html#addErrors(javax.servlet.http.HttpServletRequest, org.apache.struts.action.ActionMessages)">addErrors</A>, <A HREF="../../../../org/apache/struts/action/Action.html#addMessages(javax.servlet.http.HttpServletRequest, org.apache.struts.action.ActionMessages)">addMessages</A>, <A HREF="../../../../org/apache/struts/action/Action.html#execute(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.ServletRequest, javax.servlet.ServletResponse)">execute</A>, <A HREF="../../../../org/apache/struts/action/Action.html#generateToken(javax.servlet.http.HttpServletRequest)">generateToken</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getDataSource(javax.servlet.http.HttpServletRequest)">getDataSource</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getDataSource(javax.servlet.http.HttpServletRequest, java.lang.String)">getDataSource</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getErrors(javax.servlet.http.HttpServletRequest)">getErrors</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getLocale(javax.servlet.http.HttpServletRequest)">getLocale</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getMessages(javax.servlet.http.HttpServletRequest)">getMessages</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getResources(javax.servlet.http.HttpServletRequest)">getResources</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getResources(javax.servlet.http.HttpServletRequest, java.lang.String)">getResources</A>, <A HREF="../../../../org/apache/struts/action/Action.html#getServlet()">getServlet</A>, <A HREF="../../../../org/apache/struts/action/Action.html#isCancelled(javax.servlet.http.HttpServletRequest)">isCancelled</A>, <A HREF="../../../../org/apache/struts/action/Action.html#isTokenValid(javax.servlet.http.HttpServletRequest)">isTokenValid</A>, <A HREF="../../../../org/apache/struts/action/Action.html#isTokenValid(javax.servlet.http.HttpServletRequest, boolean)">isTokenValid</A>, <A HREF="../../../../org/apache/struts/action/Action.html#resetToken(javax.servlet.http.HttpServletRequest)">resetToken</A>, <A HREF="../../../../org/apache/struts/action/Action.html#saveErrors(javax.servlet.http.HttpServletRequest, org.apache.struts.action.ActionErrors)">saveErrors</A>, <A HREF="../../../../org/apache/struts/action/Action.html#saveErrors(javax.servlet.http.HttpServletRequest, org.apache.struts.action.ActionMessages)">saveErrors</A>, <A HREF="../../../../org/apache/struts/action/Action.html#saveErrors(javax.servlet.http.HttpSession, org.apache.struts.action.ActionMessages)">saveErrors</A>, <A HREF="../../../../org/apache/struts/action/Action.html#saveMessages(javax.servlet.http.HttpServletRequest, org.apache.struts.action.ActionMessages)">saveMessages</A>, <A HREF="../../../../org/apache/struts/action/Action.html#saveMessages(javax.servlet.http.HttpSession, org.apache.struts.action.ActionMessages)">saveMessages</A>, <A HREF="../../../../org/apache/struts/action/Action.html#saveToken(javax.servlet.http.HttpServletRequest)">saveToken</A>, <A HREF="../../../../org/apache/struts/action/Action.html#setLocale(javax.servlet.http.HttpServletRequest, java.util.Locale)">setLocale</A>, <A HREF="../../../../org/apache/struts/action/Action.html#setServlet(org.apache.struts.action.ActionServlet)">setServlet</A></CODE></TD>
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
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<TD><CODE><clinit>, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait</CODE></TD>
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<B>Field Detail</B></FONT></TD>
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<A NAME="DEFAULT_BUFFER_SIZE"><!-- --></A><H3>
DEFAULT_BUFFER_SIZE</H3>
<PRE>
protected static final int <B>DEFAULT_BUFFER_SIZE</B></PRE>
<DL>
<DD>If the <code>getBufferSize()</code> method is not overridden, this is
 the buffer size that will be used to transfer the data to the servlet
 output stream.</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<B>Constructor Detail</B></FONT></TD>
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<A NAME="DownloadAction()"><!-- --></A><H3>
DownloadAction</H3>
<PRE>
public <B>DownloadAction</B>()</PRE>
<DL>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<A NAME="getStreamInfo(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)"><!-- --></A><H3>
getStreamInfo</H3>
<PRE>
protected abstract <A HREF="../../../../org/apache/struts/actions/DownloadAction.StreamInfo.html">DownloadAction.StreamInfo</A> <B>getStreamInfo</B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A>&nbsp;mapping,
                                                           <A HREF="../../../../org/apache/struts/action/ActionForm.html">ActionForm</A>&nbsp;form,
                                                           javax.servlet.http.HttpServletRequest&nbsp;request,
                                                           javax.servlet.http.HttpServletResponse&nbsp;response)
                                                    throws java.lang.Exception</PRE>
<DL>
<DD>Returns the information on the file, or other stream, to be downloaded
 by this action. This method must be implemented by an extending class.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>mapping</CODE> - The ActionMapping used to select this instance.<DD><CODE>form</CODE> - The optional ActionForm bean for this request (if any).<DD><CODE>request</CODE> - The HTTP request we are processing.<DD><CODE>response</CODE> - The HTTP response we are creating.<DT><B>Returns:</B><DD>The information for the file to be downloaded.<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an exception occurs.</DL>
</DD>
</DL>
<HR>

<A NAME="getBufferSize()"><!-- --></A><H3>
getBufferSize</H3>
<PRE>
protected int <B>getBufferSize</B>()</PRE>
<DL>
<DD>Returns the size of the buffer to be used in transferring the data to
 the servlet output stream. This method may be overridden by an extending
 class in order to customize the buffer size.<DD><DL>
<DT><B>Returns:</B><DD>The size of the transfer buffer, in bytes.</DL>
</DD>
</DL>
<HR>

<A NAME="execute(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)"><!-- --></A><H3>
execute</H3>
<PRE>
public <A HREF="../../../../org/apache/struts/action/ActionForward.html">ActionForward</A> <B>execute</B>(<A HREF="../../../../org/apache/struts/action/ActionMapping.html">ActionMapping</A>&nbsp;mapping,
                             <A HREF="../../../../org/apache/struts/action/ActionForm.html">ActionForm</A>&nbsp;form,
                             javax.servlet.http.HttpServletRequest&nbsp;request,
                             javax.servlet.http.HttpServletResponse&nbsp;response)
                      throws java.lang.Exception</PRE>
<DL>
<DD>Process the specified HTTP request, and create the corresponding HTTP
 response (or forward to another web component that will create it).
 Return an <code>ActionForward</code> instance describing where and how
 control should be forwarded, or <code>null</code> if the response has
 already been completed.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/apache/struts/action/Action.html#execute(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)">execute</A></CODE> in class <CODE><A HREF="../../../../org/apache/struts/action/Action.html">Action</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>mapping</CODE> - The ActionMapping used to select this instance.<DD><CODE>form</CODE> - The optional ActionForm bean for this request (if any).<DD><CODE>request</CODE> - The HTTP request we are processing.<DD><CODE>response</CODE> - The HTTP response we are creating.<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an exception occurs.</DL>
</DD>
</DL>
<HR>

<A NAME="copy(java.io.InputStream, java.io.OutputStream)"><!-- --></A><H3>
copy</H3>
<PRE>
public int <B>copy</B>(java.io.InputStream&nbsp;input,
                java.io.OutputStream&nbsp;output)
         throws java.io.IOException</PRE>
<DL>
<DD>Copy bytes from an <code>InputStream</code> to an
 <code>OutputStream</code>.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>input</CODE> - The <code>InputStream</code> to read from.<DD><CODE>output</CODE> - The <code>OutputStream</code> to write to.<DT><B>Returns:</B><DD>the number of bytes copied<DT><B>Throws:</B><DD><CODE>java.io.IOException</CODE> - In case of an I/O problem</DL>
</DD>
</DL>
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