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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:35:35 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class URL</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <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="class-use/URL.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </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-files/index-1.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><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/net/SocketPermission.html"><B>PREV CLASS</B></A> <A HREF="../../java/net/URLClassLoader.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="URL.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | 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><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.net</FONT><BR>Class URL</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<B>java.net.URL</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../java/io/Serializable.html">Serializable</A></DD></DL><HR><DL><DT>public final class <B>URL</B><DT>extends <A HREF="../../java/lang/Object.html">Object</A><DT>implements <A HREF="../../java/io/Serializable.html">Serializable</A></DL><P>Class <code>URL</code> represents a Uniform Resource Locator, a pointer to a "resource" on the World Wide Web. A resource can be something as simple as a file or a directory, or it can be a reference to a more complicated object, such as a query to a database or to a search engine. More information on the types of URLs and their formats can be found at: <blockquote><pre> http://www.ncsa.uiuc.edu/demoweb/url-primer.html </pre></blockquote> <p> In general, a URL can be broken into several parts. The previous example of a URL indicates that the protocol to use is <code>http</code> (HyperText Transfer Protocol) and that the information resides on a host machine named <code>www.ncsa.uiuc.edu</code>. The information on that host machine is named <code>/demoweb/url-primer.html</code>. The exact meaning of this name on the host machine is both protocol dependent and host dependent. The information normally resides in a file, but it could be generated on the fly. This component of the URL is called the <i>path</i> component. <p> A URL can optionally specify a "port", which is the port number to which the TCP connection is made on the remote host machine. If the port is not specified, the default port for the protocol is used instead. For example, the default port for <code>http</code> is <code>80</code>. An alternative port could be specified as: <blockquote><pre> http://www.ncsa.uiuc.edu:8080/demoweb/url-primer.html </pre></blockquote> <p> A URL may have appended to it a "fragment", also known as a "ref" or a "reference". The fragment is indicated by the sharp sign character "#" followed by more characters. For example, <blockquote><pre> http://java.sun.com/index.html#chapter1 </pre></blockquote> <p> This fragment is not technically part of the URL. Rather, it indicates that after the specified resource is retrieved, the application is specifically interested in that part of the document that has the tag <code>chapter1</code> attached to it. The meaning of a tag is resource specific. <p> An application can also specify a "relative URL", which contains only enough information to reach the resource relative to another URL. Relative URLs are frequently used within HTML pages. For example, if the contents of the URL: <blockquote><pre> http://java.sun.com/index.html </pre></blockquote> contained within it the relative URL: <blockquote><pre> FAQ.html </pre></blockquote> it would be a shorthand for: <blockquote><pre> http://java.sun.com/FAQ.html </pre></blockquote> <p> The relative URL need not specify all the components of a URL. If the protocol, host name, or port number is missing, the value is inherited from the fully specified URL. The file component must be specified. The optional fragment is not inherited.<P><DL><DT><B>Since: </B><DD>JDK1.0</DD><DT><B>See Also: </B><DD><A HREF="../../serialized-form.html#java.net.URL">Serialized Form</A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/net/URL.html#URL(java.lang.String)">URL</A></B>(<A HREF="../../java/lang/String.html">String</A> spec)</CODE><BR> Creates a <code>URL</code> object from the <code>String</code> representation.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/net/URL.html#URL(java.lang.String, java.lang.String, int, java.lang.String)">URL</A></B>(<A HREF="../../java/lang/String.html">String</A> protocol, <A HREF="../../java/lang/String.html">String</A> host, int port, <A HREF="../../java/lang/String.html">String</A> file)</CODE><BR> Creates a <code>URL</code> object from the specified <code>protocol</code>, <code>host</code>, <code>port</code> number, and <code>file</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/net/URL.html#URL(java.lang.String, java.lang.String, int, java.lang.String, java.net.URLStreamHandler)">URL</A></B>(<A HREF="../../java/lang/String.html">String</A> protocol, <A HREF="../../java/lang/String.html">String</A> host, int port, <A HREF="../../java/lang/String.html">String</A> file, <A HREF="../../java/net/URLStreamHandler.html">URLStreamHandler</A> handler)</CODE><BR> Creates a <code>URL</code> object from the specified <code>protocol</code>, <code>host</code>, <code>port</code> number, <code>file</code>, and <code>handler</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/net/URL.html#URL(java.lang.String, java.lang.String, java.lang.String)">URL</A></B>(<A HREF="../../java/lang/String.html">String</A> protocol, <A HREF="../../java/lang/String.html">String</A> host, <A HREF="../../java/lang/String.html">String</A> file)</CODE><BR> Creates a URL from the specified <code>protocol</code> name, <code>host</code> name, and <code>file</code> name.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/net/URL.html#URL(java.net.URL, java.lang.String)">URL</A></B>(<A HREF="../../java/net/URL.html">URL</A> context, <A HREF="../../java/lang/String.html">String</A> spec)</CODE><BR> Creates a URL by parsing the given spec within a specified context.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/net/URL.html#URL(java.net.URL, java.lang.String, java.net.URLStreamHandler)">URL</A></B>(<A HREF="../../java/net/URL.html">URL</A> context, <A HREF="../../java/lang/String.html">String</A> spec, <A HREF="../../java/net/URLStreamHandler.html">URLStreamHandler</A> handler)</CODE><BR> Creates a URL by parsing the given spec with the specified handler within a specified context.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></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="../../java/net/URL.html#equals(java.lang.Object)">equals</A></B>(<A HREF="../../java/lang/Object.html">Object</A> obj)</CODE><BR> Compares two URLs.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/URL.html#getAuthority()">getAuthority</A></B>()</CODE><BR> Returns the authority part of this <code>URL</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/Object.html">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/URL.html#getContent()">getContent</A></B>()</CODE><BR> Returns the contents of this URL.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/Object.html">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/URL.html#getContent(java.lang.Class[])">getContent</A></B>(<A HREF="../../java/lang/Class.html">Class</A>[] classes)</CODE><BR> Returns the contents of this URL.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/URL.html#getFile()">getFile</A></B>()</CODE><BR> Returns the file name of this <code>URL</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/net/URL.html#getHost()">getHost</A></B>()</CODE>⌨️ 快捷键说明
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