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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>Robotstxt xref</title><link type="text/css" rel="stylesheet" href="../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../apidocs/org/archive/crawler/datamodel/Robotstxt.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment"> Robots.java</em></em><a name="2" href="#2">2</a> <em class="comment"> *</em><a name="3" href="#3">3</a> <em class="comment"> * $Id: Robotstxt.java 4947 2007-03-01 04:47:24Z gojomo $</em><a name="4" href="#4">4</a> <em class="comment"> *</em><a name="5" href="#5">5</a> <em class="comment"> * Created Sep 1, 2005</em><a name="6" href="#6">6</a> <em class="comment"> *</em><a name="7" href="#7">7</a> <em class="comment"> * Copyright (C) 2005 Internet Archive.</em><a name="8" href="#8">8</a> <em class="comment"> *</em><a name="9" href="#9">9</a> <em class="comment"> * This file is part of the Heritrix web crawler (crawler.archive.org).</em><a name="10" href="#10">10</a> <em class="comment"> *</em><a name="11" href="#11">11</a> <em class="comment"> * Heritrix is free software; you can redistribute it and/or modify</em><a name="12" href="#12">12</a> <em class="comment"> * it under the terms of the GNU Lesser Public License as published by</em><a name="13" href="#13">13</a> <em class="comment"> * the Free Software Foundation; either version 2.1 of the License, or</em><a name="14" href="#14">14</a> <em class="comment"> * any later version.</em><a name="15" href="#15">15</a> <em class="comment"> *</em><a name="16" href="#16">16</a> <em class="comment"> * Heritrix is distributed in the hope that it will be useful,</em><a name="17" href="#17">17</a> <em class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</em><a name="18" href="#18">18</a> <em class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</em><a name="19" href="#19">19</a> <em class="comment"> * GNU Lesser Public License for more details.</em><a name="20" href="#20">20</a> <em class="comment"> *</em><a name="21" href="#21">21</a> <em class="comment"> * You should have received a copy of the GNU Lesser Public License</em><a name="22" href="#22">22</a> <em class="comment"> * along with Heritrix; if not, write to the Free Software</em><a name="23" href="#23">23</a> <em class="comment"> * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA</em><a name="24" href="#24">24</a> <em class="comment"> */</em><a name="25" href="#25">25</a> <strong>package</strong> <a href="../../../../org/archive/crawler/datamodel/package-summary.html">org.archive.crawler.datamodel</a>;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>import</strong> java.io.BufferedReader;<a name="28" href="#28">28</a> <strong>import</strong> java.io.IOException;<a name="29" href="#29">29</a> <strong>import</strong> java.util.ArrayList;<a name="30" href="#30">30</a> <strong>import</strong> java.util.LinkedList;<a name="31" href="#31">31</a> <strong>import</strong> java.util.List;<a name="32" href="#32">32</a> <strong>import</strong> java.util.Map;<a name="33" href="#33">33</a> <a name="34" href="#34">34</a> <em>/**<em>*</em></em><a name="35" href="#35">35</a> <em> * Utility class for parsing 'robots.txt' format directives, into a list</em><a name="36" href="#36">36</a> <em> * of named user-agents and map from user-agents to disallowed paths. </em><a name="37" href="#37">37</a> <em> */</em><a name="38" href="#38">38</a> <strong>public</strong> <strong>class</strong> <a href="../../../../org/archive/crawler/datamodel/Robotstxt.html">Robotstxt</a> {<a name="39" href="#39">39</a> <strong>public</strong> <strong>static</strong> <strong>boolean</strong> parse(BufferedReader reader,<a name="40" href="#40">40</a> <strong>final</strong> LinkedList<String> userAgents, <a name="41" href="#41">41</a> <strong>final</strong> Map<String,List<String>> disallows)<a name="42" href="#42">42</a> throws IOException {<a name="43" href="#43">43</a> <strong>boolean</strong> hasErrors = false;<a name="44" href="#44">44</a> String read;<a name="45" href="#45">45</a> <em class="comment">// current is the disallowed paths for the preceding User-Agent(s)</em><a name="46" href="#46">46</a> ArrayList<String> current = <strong>null</strong>;<a name="47" href="#47">47</a> <em class="comment">// whether a non-'User-Agent' directive has been encountered</em><a name="48" href="#48">48</a> <strong>boolean</strong> hasDirectivesYet = false; <a name="49" href="#49">49</a> String catchall = <strong>null</strong>;<a name="50" href="#50">50</a> <strong>while</strong> (reader != <strong>null</strong>) {<a name="51" href="#51">51</a> <strong>do</strong> {<a name="52" href="#52">52</a> read = reader.readLine();<a name="53" href="#53">53</a> <em class="comment">// Skip comments & blanks</em><a name="54" href="#54">54</a> } <strong>while</strong> ((read != <strong>null</strong>) && ((read = read.trim()).startsWith(<span class="string">"#"</span>) ||<a name="55" href="#55">55</a> read.length() == 0));<a name="56" href="#56">56</a> <strong>if</strong> (read == <strong>null</strong>) {<a name="57" href="#57">57</a> reader.close();<a name="58" href="#58">58</a> reader = <strong>null</strong>;<a name="59" href="#59">59</a> } <strong>else</strong> {<a name="60" href="#60">60</a> <strong>int</strong> commentIndex = read.indexOf(<span class="string">"#"</span>);<a name="61" href="#61">61</a> <strong>if</strong> (commentIndex > -1) {<a name="62" href="#62">62</a> <em class="comment">// Strip trailing comment</em><a name="63" href="#63">63</a> read = read.substring(0, commentIndex);<a name="64" href="#64">64</a> }<a name="65" href="#65">65</a> read = read.trim();<a name="66" href="#66">66</a> <strong>if</strong> (read.matches(<span class="string">"(?i)^User-agent:.*"</span>)) {<a name="67" href="#67">67</a> String ua = read.substring(11).trim().toLowerCase();<a name="68" href="#68">68</a> <strong>if</strong> (current == <strong>null</strong> || hasDirectivesYet ) {<a name="69" href="#69">69</a> <em class="comment">// only create new rules-list if necessary</em><a name="70" href="#70">70</a> <em class="comment">// otherwise share with previous user-agent</em><a name="71" href="#71">71</a> current = <strong>new</strong> ArrayList<String>();<a name="72" href="#72">72</a> hasDirectivesYet = false; <a name="73" href="#73">73</a> }<a name="74" href="#74">74</a> <strong>if</strong> (ua.equals(<span class="string">"*"</span>)) {<a name="75" href="#75">75</a> ua = <span class="string">""</span>;<a name="76" href="#76">76</a> catchall = ua;<a name="77" href="#77">77</a> } <strong>else</strong> {<a name="78" href="#78">78</a> userAgents.addLast(ua);<a name="79" href="#79">79</a> }<a name="80" href="#80">80</a> disallows.put(ua, current);<a name="81" href="#81">81</a> <strong>continue</strong>;<a name="82" href="#82">82</a> }<a name="83" href="#83">83</a> <strong>if</strong> (read.matches(<span class="string">"(?i)Disallow:.*"</span>)) {<a name="84" href="#84">84</a> <strong>if</strong> (current == <strong>null</strong>) {<a name="85" href="#85">85</a> <em class="comment">// buggy robots.txt</em><a name="86" href="#86">86</a> hasErrors = <strong>true</strong>;<a name="87" href="#87">87</a> <strong>continue</strong>;<a name="88" href="#88">88</a> }<a name="89" href="#89">89</a> String path = read.substring(9).trim();<a name="90" href="#90">90</a> current.add(path);<a name="91" href="#91">91</a> hasDirectivesYet = <strong>true</strong>; <a name="92" href="#92">92</a> <strong>continue</strong>;<a name="93" href="#93">93</a> }<a name="94" href="#94">94</a> <strong>if</strong> (read.matches(<span class="string">"(?i)Crawl-delay:.*"</span>)) {<a name="95" href="#95">95</a> <strong>if</strong> (current == <strong>null</strong>) {<a name="96" href="#96">96</a> <em class="comment">// buggy robots.txt</em><a name="97" href="#97">97</a> hasErrors = <strong>true</strong>;<a name="98" href="#98">98</a> <strong>continue</strong>;<a name="99" href="#99">99</a> }<a name="100" href="#100">100</a> <em class="comment">// consider a crawl-delay, even though we don't </em><a name="101" href="#101">101</a> <em class="comment">// yet understand it, as sufficient to end a </em><a name="102" href="#102">102</a> <em class="comment">// grouping of User-Agent lines</em><a name="103" href="#103">103</a> hasDirectivesYet = <strong>true</strong>;<a name="104" href="#104">104</a> <em class="comment">// TODO: understand/save/respect 'Crawl-Delay' </em><a name="105" href="#105">105</a> <strong>continue</strong>;<a name="106" href="#106">106</a> }<a name="107" href="#107">107</a> <strong>if</strong> (read.matches(<span class="string">"(?i)Allow:.*"</span>)) {<a name="108" href="#108">108</a> <strong>if</strong> (current == <strong>null</strong>) {<a name="109" href="#109">109</a> <em class="comment">// buggy robots.txt</em><a name="110" href="#110">110</a> hasErrors = <strong>true</strong>;<a name="111" href="#111">111</a> <strong>continue</strong>;<a name="112" href="#112">112</a> }<a name="113" href="#113">113</a> <em class="comment">// consider an Allow, even though we don't </em><a name="114" href="#114">114</a> <em class="comment">// yet understand it, as sufficient to end a </em><a name="115" href="#115">115</a> <em class="comment">// grouping of User-Agent lines</em><a name="116" href="#116">116</a> hasDirectivesYet = <strong>true</strong>;<a name="117" href="#117">117</a> <em class="comment">// TODO: understand/save/respect 'Allow' </em><a name="118" href="#118">118</a> <strong>continue</strong>;<a name="119" href="#119">119</a> }<a name="120" href="#120">120</a> <em class="comment">// unknown line; do nothing for now</em><a name="121" href="#121">121</a> }<a name="122" href="#122">122</a> }<a name="123" href="#123">123</a> <a name="124" href="#124">124</a> <strong>if</strong> (catchall != <strong>null</strong>) {<a name="125" href="#125">125</a> userAgents.addLast(catchall);<a name="126" href="#126">126</a> }<a name="127" href="#127">127</a> <strong>return</strong> hasErrors;<a name="128" href="#128">128</a> }<a name="129" href="#129">129</a> <a name="130" href="#130">130</a> <em>/**<em>*</em></em><a name="131" href="#131">131</a> <em> * @param args Command-line arguments.</em><a name="132" href="#132">132</a> <em> */</em><a name="133" href="#133">133</a> <strong>public</strong> <strong>static</strong> <strong>void</strong> main(String[] args) {<a name="134" href="#134">134</a> <em class="comment">// TODO Auto-generated method stub</em><a name="135" href="#135">135</a> }<a name="136" href="#136">136</a> }</pre><hr/><div id="footer">This page was automatically generated by <a href="http://maven.apache.org/">Maven</a></div></body></html>?? 快捷鍵說明
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