extractorcss.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="93" href="#93">93</a>      <em>/**<em>*</em></em>
<a name="94" href="#94">94</a>  <em>     * @param curi Crawl URI to process.</em>
<a name="95" href="#95">95</a>  <em>     */</em>
<a name="96" href="#96">96</a>      <strong>public</strong> <strong>void</strong> extract(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi) {
<a name="97" href="#97">97</a>          <strong>if</strong> (!isHttpTransactionContentToProcess(curi)) {
<a name="98" href="#98">98</a>              <strong>return</strong>;
<a name="99" href="#99">99</a>          }
<a name="100" href="#100">100</a>         String mimeType = curi.getContentType();
<a name="101" href="#101">101</a>         <strong>if</strong> (mimeType == <strong>null</strong>) {
<a name="102" href="#102">102</a>             <strong>return</strong>;
<a name="103" href="#103">103</a>         }
<a name="104" href="#104">104</a>         <strong>if</strong> ((mimeType.toLowerCase().indexOf(<span class="string">"css"</span>) &lt; 0) &amp;&amp;
<a name="105" href="#105">105</a>                 (!curi.toString().toLowerCase().endsWith(<span class="string">".css"</span>))) {
<a name="106" href="#106">106</a>             <strong>return</strong>;
<a name="107" href="#107">107</a>         }
<a name="108" href="#108">108</a>         <strong>this</strong>.numberOfCURIsHandled++;
<a name="109" href="#109">109</a> 
<a name="110" href="#110">110</a>         <a href="../../../../org/archive/io/ReplayCharSequence.html">ReplayCharSequence</a> cs = <strong>null</strong>;
<a name="111" href="#111">111</a>         <strong>try</strong> {
<a name="112" href="#112">112</a>             cs = curi.getHttpRecorder().getReplayCharSequence();
<a name="113" href="#113">113</a>         } <strong>catch</strong> (IOException e) {
<a name="114" href="#114">114</a>             logger.severe(<span class="string">"Failed getting ReplayCharSequence: "</span> + e.getMessage());
<a name="115" href="#115">115</a>         }
<a name="116" href="#116">116</a>         <strong>if</strong> (cs == <strong>null</strong>) {
<a name="117" href="#117">117</a>             logger.warning(<span class="string">"Failed getting ReplayCharSequence: "</span> +
<a name="118" href="#118">118</a>                 curi.toString());
<a name="119" href="#119">119</a>             <strong>return</strong>;
<a name="120" href="#120">120</a>         }
<a name="121" href="#121">121</a>         
<a name="122" href="#122">122</a>         <em class="comment">// We have a ReplayCharSequence open.  Wrap all in finally so we</em>
<a name="123" href="#123">123</a>         <em class="comment">// for sure close it before we leave.</em>
<a name="124" href="#124">124</a>         <strong>try</strong> {
<a name="125" href="#125">125</a>             <strong>this</strong>.numberOfLinksExtracted +=
<a name="126" href="#126">126</a>                 processStyleCode(curi, cs, getController());
<a name="127" href="#127">127</a>             <em class="comment">// Set flag to indicate that link extraction is completed.</em>
<a name="128" href="#128">128</a>             curi.linkExtractorFinished();
<a name="129" href="#129">129</a>         } <strong>finally</strong> {
<a name="130" href="#130">130</a>             <strong>if</strong> (cs != <strong>null</strong>) {
<a name="131" href="#131">131</a>                 <strong>try</strong> {
<a name="132" href="#132">132</a>                     cs.close();
<a name="133" href="#133">133</a>                 } <strong>catch</strong> (IOException ioe) {
<a name="134" href="#134">134</a>                     logger.warning(TextUtils.exceptionToString(
<a name="135" href="#135">135</a>                         <span class="string">"Failed close of ReplayCharSequence."</span>, ioe));
<a name="136" href="#136">136</a>                 }
<a name="137" href="#137">137</a>             }
<a name="138" href="#138">138</a>         }
<a name="139" href="#139">139</a>     }
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a>     <strong>public</strong> <strong>static</strong> <strong>long</strong> processStyleCode(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi, CharSequence cs,
<a name="142" href="#142">142</a>             <a href="../../../../org/archive/crawler/framework/CrawlController.html">CrawlController</a> controller) {
<a name="143" href="#143">143</a>         <strong>long</strong> foundLinks = 0;
<a name="144" href="#144">144</a>         Matcher uris = <strong>null</strong>;
<a name="145" href="#145">145</a>         String cssUri;
<a name="146" href="#146">146</a>         <strong>try</strong> {
<a name="147" href="#147">147</a>             uris = TextUtils.getMatcher(CSS_URI_EXTRACTOR, cs);
<a name="148" href="#148">148</a>             <strong>while</strong> (uris.find()) {
<a name="149" href="#149">149</a>                 cssUri = uris.group(2);
<a name="150" href="#150">150</a>                 <em class="comment">// TODO: Escape more HTML Entities.</em>
<a name="151" href="#151">151</a>                 cssUri = TextUtils.replaceAll(ESCAPED_AMP, cssUri, <span class="string">"&amp;"</span>);
<a name="152" href="#152">152</a>                 <em class="comment">// Remove backslashes when used as escape character in CSS URL</em>
<a name="153" href="#153">153</a>                 cssUri = TextUtils.replaceAll(CSS_BACKSLASH_ESCAPE, cssUri,
<a name="154" href="#154">154</a>                         <span class="string">"$1"</span>);
<a name="155" href="#155">155</a>                 foundLinks++;
<a name="156" href="#156">156</a>                 <strong>try</strong> {
<a name="157" href="#157">157</a>                     curi.createAndAddLinkRelativeToBase(cssUri,Link.EMBED_MISC,
<a name="158" href="#158">158</a>                             Link.EMBED_HOP);
<a name="159" href="#159">159</a>                 } <strong>catch</strong> (URIException e) {
<a name="160" href="#160">160</a>                     <em class="comment">// There may not be a controller (e.g. If we're being run</em>
<a name="161" href="#161">161</a>                     <em class="comment">// by the extractor tool).</em>
<a name="162" href="#162">162</a>                     <strong>if</strong> (controller != <strong>null</strong>) {
<a name="163" href="#163">163</a>                         controller.logUriError(e, curi.getUURI(), cssUri);
<a name="164" href="#164">164</a>                     } <strong>else</strong> {
<a name="165" href="#165">165</a>                         logger.info(curi + <span class="string">", "</span> + cssUri + <span class="string">": "</span> +
<a name="166" href="#166">166</a>                             e.getMessage());
<a name="167" href="#167">167</a>                     }
<a name="168" href="#168">168</a>                 }
<a name="169" href="#169">169</a>             }
<a name="170" href="#170">170</a>         } <strong>catch</strong> (StackOverflowError e) {
<a name="171" href="#171">171</a>             DevUtils.warnHandle(e, <span class="string">"ExtractorCSS StackOverflowError"</span>);
<a name="172" href="#172">172</a>         } <strong>finally</strong> {
<a name="173" href="#173">173</a>             TextUtils.recycleMatcher(uris);
<a name="174" href="#174">174</a>         }
<a name="175" href="#175">175</a>         <strong>return</strong> foundLinks;
<a name="176" href="#176">176</a>     }
<a name="177" href="#177">177</a> 
<a name="178" href="#178">178</a>     <strong>public</strong> String report() {
<a name="179" href="#179">179</a>         StringBuffer ret = <strong>new</strong> StringBuffer();
<a name="180" href="#180">180</a>         ret.append(<span class="string">"Processor: org.archive.crawler.extractor.ExtractorCSS\n"</span>);
<a name="181" href="#181">181</a>         ret.append(<span class="string">"  Function:          Link extraction on Cascading Style Sheets (.css)\n"</span>);
<a name="182" href="#182">182</a>         ret.append(<span class="string">"  CrawlURIs handled: "</span> + numberOfCURIsHandled + <span class="string">"\n"</span>);
<a name="183" href="#183">183</a>         ret.append(<span class="string">"  Links extracted:   "</span> + numberOfLinksExtracted + <span class="string">"\n\n"</span>);
<a name="184" href="#184">184</a> 
<a name="185" href="#185">185</a>         <strong>return</strong> ret.toString();
<a name="186" href="#186">186</a>     }
<a name="187" href="#187">187</a> }
</pre>
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