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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 05:47:03 PST 2008 --><TITLE>SharedFileInputStream (Java EE 5)</TITLE><META NAME="keywords" CONTENT="javax.mail.util.SharedFileInputStream class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="SharedFileInputStream (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/mail/util/SharedByteArrayInputStream.html" title="class in javax.mail.util"><B>PREV CLASS</B></A> NEXT CLASS</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html?javax/mail/util/SharedFileInputStream.html" target="_top"><B>FRAMES</B></A> <A HREF="SharedFileInputStream.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 | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <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.mail.util</FONT><BR>Class SharedFileInputStream</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 "><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/InputStream.html" title="class or interface in java.io">java.io.InputStream</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/FilterInputStream.html" title="class or interface in java.io">java.io.FilterInputStream</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedInputStream.html" title="class or interface in java.io">java.io.BufferedInputStream</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>javax.mail.util.SharedFileInputStream</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/Closeable.html" title="class or interface in java.io">Closeable</A>, <A HREF="../../../javax/mail/internet/SharedInputStream.html" title="interface in javax.mail.internet">SharedInputStream</A></DD></DL><HR><DL><DT><PRE>public class <B>SharedFileInputStream</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedInputStream.html" title="class or interface in java.io">BufferedInputStream</A><DT>implements <A HREF="../../../javax/mail/internet/SharedInputStream.html" title="interface in javax.mail.internet">SharedInputStream</A></DL></PRE><P>A <code>SharedFileInputStream</code> is a <code>BufferedInputStream</code> that buffers data from the file and supports the <code>mark</code> and <code>reset</code> methods. It also supports the <code>newStream</code> method that allows you to create other streams that represent subsets of the file. A <code>RandomAccessFile</code> object is used to access the file data. <p> Note that when the SharedFileInputStream is closed, all streams created with the <code>newStream</code> method are also closed. This allows the creator of the SharedFileInputStream object to control access to the underlying file and ensure that it is closed when needed, to avoid leaking file descriptors. Note also that this behavior contradicts the requirements of SharedInputStream and may change in a future release.<P><P><DL><DT><B>Since:</B></DT> <DD>JavaMail 1.4</DD><DT><B>Author:</B></DT> <DD>Bill Shannon</DD></DL><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_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>Field Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#bufpos">bufpos</A></B></CODE><BR> The file offset that corresponds to the first byte in the read buffer.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#bufsize">bufsize</A></B></CODE><BR> The normal size of the read buffer.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#datalen">datalen</A></B></CODE><BR> The amount of data in this subset of the file.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/RandomAccessFile.html" title="class or interface in java.io">RandomAccessFile</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#in">in</A></B></CODE><BR> The file containing the data.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#start">start</A></B></CODE><BR> The file offset of the start of data in this subset of the file.</TD></TR></TABLE> <A NAME="fields_inherited_from_class_java.io.BufferedInputStream"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Fields inherited from class java.io.<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedInputStream.html" title="class or interface in java.io">BufferedInputStream</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedInputStream.html#buf" title="class or interface in java.io">buf</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedInputStream.html#count" title="class or interface in java.io">count</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedInputStream.html#marklimit" title="class or interface in java.io">marklimit</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedInputStream.html#markpos" title="class or interface in java.io">markpos</A>, <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/BufferedInputStream.html#pos" title="class or interface in java.io">pos</A></CODE></TD></TR></TABLE> <!-- ======== 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/mail/util/SharedFileInputStream.html#SharedFileInputStream(java.io.File)">SharedFileInputStream</A></B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/File.html" title="class or interface in java.io">File</A> file)</CODE><BR> Creates a <code>SharedFileInputStream</code> for the file.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#SharedFileInputStream(java.io.File, int)">SharedFileInputStream</A></B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/File.html" title="class or interface in java.io">File</A> file, int size)</CODE><BR> Creates a <code>SharedFileInputStream</code> with the specified buffer size.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#SharedFileInputStream(java.lang.String)">SharedFileInputStream</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> file)</CODE><BR> Creates a <code>SharedFileInputStream</code> for the named file</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#SharedFileInputStream(java.lang.String, int)">SharedFileInputStream</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> file, int size)</CODE><BR> Creates a <code>SharedFileInputStream</code> with the specified buffer size.</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> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#available()">available</A></B>()</CODE><BR> Returns the number of bytes that can be read from this input stream without blocking.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#close()">close</A></B>()</CODE><BR> Closes this input stream and releases any system resources associated with the stream.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#finalize()">finalize</A></B>()</CODE><BR> Force this stream to close.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/mail/util/SharedFileInputStream.html#getPosition()">getPosition</A></B>()</CODE><BR> Return the current position in the InputStream, as an offset from the beginning of the InputStream.</TD>⌨️ 快捷键说明
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