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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" /><title>DownloadURLConnection xref</title><link type="text/css" rel="stylesheet" href="../../../stylesheet.css" /></head><body><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> $Id: DownloadURLConnection.java,v 1.1 2006/08/18 16:13:31 stack-sf Exp $</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * Created August 11th, 2006</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Copyright (C) 2006 Internet Archive.</em><a name="6" href="#6">6</a> <em class="comment"> *</em><a name="7" href="#7">7</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="8" href="#8">8</a> <em class="comment"> *</em><a name="9" href="#9">9</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="10" href="#10">10</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="11" href="#11">11</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="12" href="#12">12</a> <em class="comment"> * any later version.</em><a name="13" href="#13">13</a> <em class="comment"> *</em><a name="14" href="#14">14</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="15" href="#15">15</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="16" href="#16">16</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="17" href="#17">17</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="18" href="#18">18</a> <em class="comment"> *</em><a name="19" href="#19">19</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="20" href="#20">20</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="21" href="#21">21</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="22" href="#22">22</a> <em class="comment"> */</em><a name="23" href="#23">23</a> <strong>package</strong> <a href="../../../org/archive/net/package-summary.html">org.archive.net</a>;<a name="24" href="#24">24</a> <a name="25" href="#25">25</a> <strong>import</strong> java.io.BufferedInputStream;<a name="26" href="#26">26</a> <strong>import</strong> java.io.File;<a name="27" href="#27">27</a> <strong>import</strong> java.io.FileInputStream;<a name="28" href="#28">28</a> <strong>import</strong> java.io.IOException;<a name="29" href="#29">29</a> <strong>import</strong> java.io.InputStream;<a name="30" href="#30">30</a> <strong>import</strong> java.net.URL;<a name="31" href="#31">31</a> <strong>import</strong> java.net.URLConnection;<a name="32" href="#32">32</a> <strong>import</strong> java.util.logging.Level;<a name="33" href="#33">33</a> <strong>import</strong> java.util.logging.Logger;<a name="34" href="#34">34</a> <a name="35" href="#35">35</a> <strong>import</strong> org.archive.util.ProcessUtils;<a name="36" href="#36">36</a> <strong>import</strong> org.archive.util.ProcessUtils.ProcessResult;<a name="37" href="#37">37</a> <a name="38" href="#38">38</a> <em>/**<em>*</em></em><a name="39" href="#39">39</a> <em> * An URL Connection that pre-downloads URL reference before passing back a</em><a name="40" href="#40">40</a> <em> * Stream reference. When closed, it removes the local download file.</em><a name="41" href="#41">41</a> <em> * @author stack</em><a name="42" href="#42">42</a> <em> * @version $Date: 2006/08/18 16:13:31 $, $Revision: 1.1 $</em><a name="43" href="#43">43</a> <em> */</em><a name="44" href="#44">44</a> <strong>public</strong> <strong>abstract</strong> <strong>class</strong> <a href="../../../org/archive/net/DownloadURLConnection.html">DownloadURLConnection</a> <strong>extends</strong> URLConnection {<a name="45" href="#45">45</a> <strong>private</strong> <strong>final</strong> String CLASSNAME = DownloadURLConnection.<strong>class</strong>.getName();<a name="46" href="#46">46</a> <strong>private</strong> <strong>final</strong> Logger LOGGER = Logger.getLogger(CLASSNAME);<a name="47" href="#47">47</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> File TMPDIR =<a name="48" href="#48">48</a> <strong>new</strong> File(System.getProperty(<span class="string">"java.io.tmpdir"</span>, <span class="string">"/tmp"</span>));<a name="49" href="#49">49</a> <strong>private</strong> File downloadFile = <strong>null</strong>;<a name="50" href="#50">50</a> <a name="51" href="#51">51</a> <strong>protected</strong> <a href="../../../org/archive/net/DownloadURLConnection.html">DownloadURLConnection</a>(URL u) {<a name="52" href="#52">52</a> <strong>super</strong>(u);<a name="53" href="#53">53</a> }<a name="54" href="#54">54</a> <a name="55" href="#55">55</a> <strong>protected</strong> String getScript() {<a name="56" href="#56">56</a> <strong>return</strong> System.getProperty(<strong>this</strong>.getClass().getName() + <span class="string">".path"</span>,<a name="57" href="#57">57</a> <span class="string">"UNDEFINED"</span>);<a name="58" href="#58">58</a> }<a name="59" href="#59">59</a> <a name="60" href="#60">60</a> <strong>protected</strong> String [] getCommand(<strong>final</strong> URL thisUrl,<a name="61" href="#61">61</a> <strong>final</strong> File downloadFile) {<a name="62" href="#62">62</a> <strong>return</strong> <strong>new</strong> String[] {getScript(), thisUrl.getPath(),<a name="63" href="#63">63</a> downloadFile.getAbsolutePath()}; <a name="64" href="#64">64</a> }<a name="65" href="#65">65</a> <a name="66" href="#66">66</a> <em>/**<em>*</em></em><a name="67" href="#67">67</a> <em> * Do script copy to local file.</em><a name="68" href="#68">68</a> <em> * File is available via {@link #getFile()}.</em><a name="69" href="#69">69</a> <em> * @throws IOException </em><a name="70" href="#70">70</a> <em> */</em><a name="71" href="#71">71</a> <strong>public</strong> <strong>void</strong> connect() throws IOException {<a name="72" href="#72">72</a> <strong>if</strong> (<strong>this</strong>.connected) {<a name="73" href="#73">73</a> <strong>return</strong>;<a name="74" href="#74">74</a> }<a name="75" href="#75">75</a> <a name="76" href="#76">76</a> <strong>this</strong>.downloadFile = File.createTempFile(CLASSNAME, <strong>null</strong>, TMPDIR);<a name="77" href="#77">77</a> <strong>try</strong> {<a name="78" href="#78">78</a> String [] cmd = getCommand(<strong>this</strong>.url, <strong>this</strong>.downloadFile); <a name="79" href="#79">79</a> <strong>if</strong> (LOGGER.isLoggable(Level.FINE)) {<a name="80" href="#80">80</a> StringBuffer buffer = <strong>new</strong> StringBuffer();<a name="81" href="#81">81</a> <strong>for</strong> (<strong>int</strong> i = 0; i < cmd.length; i++) {<a name="82" href="#82">82</a> <strong>if</strong> (i > 0) {<a name="83" href="#83">83</a> buffer.append(<span class="string">" "</span>);<a name="84" href="#84">84</a> }<a name="85" href="#85">85</a> buffer.append(cmd[i]);<a name="86" href="#86">86</a> }<a name="87" href="#87">87</a> LOGGER.fine(<span class="string">"Command: "</span> + buffer.toString());<a name="88" href="#88">88</a> }<a name="89" href="#89">89</a> ProcessResult pr = ProcessUtils.exec(cmd);<a name="90" href="#90">90</a> <strong>if</strong> (pr.getResult() != 0) {<a name="91" href="#91">91</a> LOGGER.info(cmd + <span class="string">" returned non-null "</span> + pr.getResult());<a name="92" href="#92">92</a> }<a name="93" href="#93">93</a> <em class="comment">// Assume download went smoothly.</em><a name="94" href="#94">94</a> <strong>this</strong>.connected = <strong>true</strong>;<a name="95" href="#95">95</a> } <strong>catch</strong> (IOException ioe) {<a name="96" href="#96">96</a> <em class="comment">// Clean up my tmp file.</em><a name="97" href="#97">97</a> <strong>this</strong>.downloadFile.delete();<a name="98" href="#98">98</a> <strong>this</strong>.downloadFile = <strong>null</strong>;<a name="99" href="#99">99</a> <em class="comment">// Rethrow.</em><a name="100" href="#100">100</a> <strong>throw</strong> ioe;<a name="101" href="#101">101</a> }<a name="102" href="#102">102</a> }<a name="103" href="#103">103</a> <a name="104" href="#104">104</a> <strong>public</strong> File getFile() {<a name="105" href="#105">105</a> <strong>return</strong> <strong>this</strong>.downloadFile;<a name="106" href="#106">106</a> }<a name="107" href="#107">107</a> <a name="108" href="#108">108</a> <strong>protected</strong> <strong>void</strong> setFile(<strong>final</strong> File f) {<a name="109" href="#109">109</a> <strong>this</strong>.downloadFile = f;<a name="110" href="#110">110</a> }<a name="111" href="#111">111</a> <a name="112" href="#112">112</a> <strong>public</strong> InputStream getInputStream() throws IOException {<a name="113" href="#113">113</a> <strong>if</strong> (!<strong>this</strong>.connected) {<a name="114" href="#114">114</a> connect();<a name="115" href="#115">115</a> }<a name="116" href="#116">116</a> <a name="117" href="#117">117</a> <em class="comment">// Return BufferedInputStream so 'delegation' is done for me, so</em><a name="118" href="#118">118</a> <em class="comment">// I don't have to implement all IS methods and pass to my</em><a name="119" href="#119">119</a> <em class="comment">// 'delegate' instance.</em><a name="120" href="#120">120</a> <strong>final</strong> <a href="../../../org/archive/net/DownloadURLConnection.html">DownloadURLConnection</a> connection = <strong>this</strong>;<a name="121" href="#121">121</a> <strong>return</strong> <strong>new</strong> BufferedInputStream(<strong>new</strong> FileInputStream(<strong>this</strong>.downloadFile)) {<a name="122" href="#122">122</a> <strong>private</strong> <a href="../../../org/archive/net/DownloadURLConnection.html">DownloadURLConnection</a> ruc = connection;<a name="123" href="#123">123</a> <a name="124" href="#124">124</a> <strong>public</strong> <strong>void</strong> close() throws IOException {<a name="125" href="#125">125</a> <strong>super</strong>.close();<a name="126" href="#126">126</a> <strong>if</strong> (<strong>this</strong>.ruc != <strong>null</strong> && <strong>this</strong>.ruc.getFile()!= <strong>null</strong> &&<a name="127" href="#127">127</a> <strong>this</strong>.ruc.getFile().exists()) {<a name="128" href="#128">128</a> <strong>this</strong>.ruc.getFile().delete();<a name="129" href="#129">129</a> <strong>this</strong>.ruc.setFile(<strong>null</strong>);<a name="130" href="#130">130</a> }<a name="131" href="#131">131</a> }<a name="132" href="#132">132</a> };<a name="133" href="#133">133</a> }<a name="134" href="#134">134</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>⌨️ 快捷键说明
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