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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=UTF-8" /><title>Handler xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/net/md5/Handler.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> $Id: Handler.java,v 1.4 2006/08/31 16:51:41 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/md5/package-summary.html">org.archive.net.md5</a>;<a name="24" href="#24">24</a> <a name="25" href="#25">25</a> <strong>import</strong> java.io.IOException;<a name="26" href="#26">26</a> <strong>import</strong> java.io.InputStream;<a name="27" href="#27">27</a> <strong>import</strong> java.net.URL;<a name="28" href="#28">28</a> <strong>import</strong> java.net.URLConnection;<a name="29" href="#29">29</a> <strong>import</strong> java.net.URLStreamHandler;<a name="30" href="#30">30</a> <a name="31" href="#31">31</a> <em>/**<em>*</em></em><a name="32" href="#32">32</a> <em> * A protocol handler for an 'md5' URI scheme.</em><a name="33" href="#33">33</a> <em> * Md5 URLs look like this: <code>md5:deadbeefdeadbeefdeadbeefdeadbeef</code></em><a name="34" href="#34">34</a> <em> * When this handler is invoked against an md5 URL, it passes the raw md5 to </em><a name="35" href="#35">35</a> <em> * the configured script as an argument. The configured script then does the</em><a name="36" href="#36">36</a> <em> * work to bring the item pointed to by the md5 local so we can open a Stream</em><a name="37" href="#37">37</a> <em> * on the local copy. Local file is deleted when we finish. Do</em><a name="38" href="#38">38</a> <em> * {@link org.archive.net.DownloadURLConnection#getFile()} to get name of</em><a name="39" href="#39">39</a> <em> * temporary file.</em><a name="40" href="#40">40</a> <em> * </em><a name="41" href="#41">41</a> <em> * <p>You need to define the system property</em><a name="42" href="#42">42</a> <em> * <code>-Djava.protocol.handler.pkgs=org.archive.net</code> to add this handler</em><a name="43" href="#43">43</a> <em> * to the java.net.URL set. Also define system properties</em><a name="44" href="#44">44</a> <em> * <code>-Dorg.archive.net.md5.Md5URLConnection.path=PATH_TO_SCRIPT</code> to</em><a name="45" href="#45">45</a> <em> * pass path of script to run as well as</em><a name="46" href="#46">46</a> <em> * <code>-Dorg.archive.net.md5.Md5URLConnection.options=OPTIONS</code> for</em><a name="47" href="#47">47</a> <em> * any options you'd like to include. The pointed-to PATH_TO_SCRIPT</em><a name="48" href="#48">48</a> <em> * will be invoked as follows: <code>PATH_TO_SCRIPT OPTIONS MD5</em><a name="49" href="#49">49</a> <em> * LOCAL_TMP_FILE</code>. The LOCAL_TMP_FILE file is made in</em><a name="50" href="#50">50</a> <em> * <code>java.io.tmpdir</code> using java tmp name code.</em><a name="51" href="#51">51</a> <em> * @author stack</em><a name="52" href="#52">52</a> <em> */</em><a name="53" href="#53">53</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/net/md5/Handler.html">Handler</a> <strong>extends</strong> URLStreamHandler {<a name="54" href="#54">54</a> <strong>protected</strong> URLConnection openConnection(URL u) {<a name="55" href="#55">55</a> <strong>return</strong> <strong>new</strong> Md5URLConnection(u);<a name="56" href="#56">56</a> }<a name="57" href="#57">57</a> <a name="58" href="#58">58</a> <em>/**<em>*</em></em><a name="59" href="#59">59</a> <em> * Main dumps rsync file to STDOUT.</em><a name="60" href="#60">60</a> <em> * @param args</em><a name="61" href="#61">61</a> <em> * @throws IOException</em><a name="62" href="#62">62</a> <em> */</em><a name="63" href="#63">63</a> <strong>public</strong> <strong>static</strong> <strong>void</strong> main(String[] args)<a name="64" href="#64">64</a> throws IOException { <a name="65" href="#65">65</a> <strong>if</strong> (args.length != 1) {<a name="66" href="#66">66</a> System.out.println(<span class="string">"Usage: java java "</span> +<a name="67" href="#67">67</a> <span class="string">"-Djava.protocol.handler.pkgs=org.archive.net "</span> +<a name="68" href="#68">68</a> <span class="string">"org.archive.net.md5.Handler "</span> +<a name="69" href="#69">69</a> <span class="string">"md5:deadbeefdeadbeefdeadbeefdeadbeef"</span>);<a name="70" href="#70">70</a> System.exit(1);<a name="71" href="#71">71</a> }<a name="72" href="#72">72</a> System.setProperty(<span class="string">"org.archive.net.md5.Md5URLConnection.path"</span>,<a name="73" href="#73">73</a> <span class="string">"/tmp/manifest"</span>);<a name="74" href="#74">74</a> System.setProperty(<span class="string">"java.protocol.handler.pkgs"</span>, <span class="string">"org.archive.net"</span>);<a name="75" href="#75">75</a> URL u = <strong>new</strong> URL(args[0]);<a name="76" href="#76">76</a> URLConnection connect = u.openConnection();<a name="77" href="#77">77</a> <em class="comment">// Write download to stdout.</em><a name="78" href="#78">78</a> <strong>final</strong> <strong>int</strong> bufferlength = 4096;<a name="79" href="#79">79</a> byte [] buffer = <strong>new</strong> byte [bufferlength];<a name="80" href="#80">80</a> InputStream is = connect.getInputStream();<a name="81" href="#81">81</a> <strong>try</strong> {<a name="82" href="#82">82</a> <strong>for</strong> (<strong>int</strong> count = is.read(buffer, 0, bufferlength);<a name="83" href="#83">83</a> (count = is.read(buffer, 0, bufferlength)) != -1;) {<a name="84" href="#84">84</a> System.out.write(buffer, 0, count);<a name="85" href="#85">85</a> }<a name="86" href="#86">86</a> System.out.flush();<a name="87" href="#87">87</a> } <strong>finally</strong> {<a name="88" href="#88">88</a> is.close();<a name="89" href="#89">89</a> }<a name="90" href="#90">90</a> }<a name="91" href="#91">91</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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