robotsexclusionpolicy.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="128" href="#128">128</a>                     String ua = (String)iter.next();
<a name="129" href="#129">129</a>                     <strong>if</strong> (userAgent.indexOf(ua)>-1) {
<a name="130" href="#130">130</a>                         userAgentsToTest.add(ua);
<a name="131" href="#131">131</a>                         <strong>break</strong>;
<a name="132" href="#132">132</a>                     }
<a name="133" href="#133">133</a>                 }
<a name="134" href="#134">134</a>             }
<a name="135" href="#135">135</a>         }
<a name="136" href="#136">136</a>     }
<a name="137" href="#137">137</a> 
<a name="138" href="#138">138</a>     <strong>public</strong> <a href="../../../../org/archive/crawler/datamodel/RobotsExclusionPolicy.html">RobotsExclusionPolicy</a>(<strong>int</strong> type) {
<a name="139" href="#139">139</a>         <strong>this</strong>(<strong>null</strong>, <strong>null</strong>, <strong>null</strong>, <strong>null</strong>);
<a name="140" href="#140">140</a>         <strong>this</strong>.type = type;
<a name="141" href="#141">141</a>     }
<a name="142" href="#142">142</a> 
<a name="143" href="#143">143</a>     <strong>public</strong> <strong>boolean</strong> disallows(<a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi, String userAgent) {
<a name="144" href="#144">144</a>         <strong>if</strong> (<strong>this</strong> == ALLOWALL)
<a name="145" href="#145">145</a>             <strong>return</strong> false;
<a name="146" href="#146">146</a>         <strong>if</strong> (<strong>this</strong> == DENYALL)
<a name="147" href="#147">147</a>             <strong>return</strong> <strong>true</strong>;
<a name="148" href="#148">148</a> 
<a name="149" href="#149">149</a>         <em class="comment">// In the common case with policy=Classic, the useragent is remembered from uri to uri on</em>
<a name="150" href="#150">150</a>         <em class="comment">// the same server</em>
<a name="151" href="#151">151</a>         <strong>if</strong>((honoringPolicy.isType(curi, RobotsHonoringPolicy.CLASSIC) 
<a name="152" href="#152">152</a>                 || honoringPolicy.isType(curi, RobotsHonoringPolicy.CUSTOM))
<a name="153" href="#153">153</a>             &amp;&amp; (lastUsedUserAgent == <strong>null</strong>
<a name="154" href="#154">154</a>             || !lastUsedUserAgent.equals(userAgent))) {
<a name="155" href="#155">155</a> 
<a name="156" href="#156">156</a>             lastUsedUserAgent = userAgent;
<a name="157" href="#157">157</a>             userAgentsToTest = <strong>new</strong> ArrayList();
<a name="158" href="#158">158</a>             Iterator iter = userAgents.iterator();
<a name="159" href="#159">159</a>             <strong>while</strong> ( iter.hasNext() ) {
<a name="160" href="#160">160</a>                 String ua = (String)iter.next();
<a name="161" href="#161">161</a>                 <strong>if</strong> (userAgent.indexOf(ua)>-1) {
<a name="162" href="#162">162</a>                     userAgentsToTest.add(ua);
<a name="163" href="#163">163</a>                     <strong>break</strong>; <em class="comment">// consider no more sections</em>
<a name="164" href="#164">164</a>                 }
<a name="165" href="#165">165</a>             }
<a name="166" href="#166">166</a>         }
<a name="167" href="#167">167</a> 
<a name="168" href="#168">168</a>         <strong>boolean</strong> disallow = false;
<a name="169" href="#169">169</a>         <strong>boolean</strong> examined = false;
<a name="170" href="#170">170</a>         String ua = <strong>null</strong>;
<a name="171" href="#171">171</a> 
<a name="172" href="#172">172</a>         <em class="comment">// Go thru list of all user agents we might act as</em>
<a name="173" href="#173">173</a>         Iterator uas = userAgentsToTest.iterator();
<a name="174" href="#174">174</a>         <strong>while</strong>(uas.hasNext() &amp;&amp; examined == false) {
<a name="175" href="#175">175</a>             disallow = false;
<a name="176" href="#176">176</a>             ua = (String) uas.next();
<a name="177" href="#177">177</a>             Iterator dis = ((List) disallows.get(ua)).iterator();
<a name="178" href="#178">178</a> 
<a name="179" href="#179">179</a>             <em class="comment">// Check if the current user agent is allowed to crawl</em>
<a name="180" href="#180">180</a>             <strong>while</strong>(dis.hasNext() &amp;&amp; examined == false &amp;&amp; disallow == false) {
<a name="181" href="#181">181</a>                 String disallowedPath = (String) dis.next();
<a name="182" href="#182">182</a>                 <strong>if</strong>(disallowedPath.length() == 0) {
<a name="183" href="#183">183</a>                     <em class="comment">// blanket allow</em>
<a name="184" href="#184">184</a>                     examined = <strong>true</strong>;
<a name="185" href="#185">185</a>                     disallow = false;
<a name="186" href="#186">186</a>                     <strong>break</strong>;
<a name="187" href="#187">187</a>                 }
<a name="188" href="#188">188</a>                 <strong>try</strong> {
<a name="189" href="#189">189</a>                     String p = curi.getUURI().getPathQuery();
<a name="190" href="#190">190</a>                     <strong>if</strong> (p != <strong>null</strong> &amp;&amp; p.startsWith(disallowedPath) ) {
<a name="191" href="#191">191</a>                         <em class="comment">// the user agent tested isn't allowed to get this uri</em>
<a name="192" href="#192">192</a>                         disallow = <strong>true</strong>;
<a name="193" href="#193">193</a>                     }
<a name="194" href="#194">194</a>                 }
<a name="195" href="#195">195</a>                 <strong>catch</strong> (URIException e) {
<a name="196" href="#196">196</a>                     logger.log(Level.SEVERE,<span class="string">"Failed getPathQuery from "</span> + curi, e);
<a name="197" href="#197">197</a>                 }
<a name="198" href="#198">198</a>             }
<a name="199" href="#199">199</a>             <strong>if</strong>(disallow == false) {
<a name="200" href="#200">200</a>                 <em class="comment">// the user agent tested is allowed</em>
<a name="201" href="#201">201</a>                 examined = <strong>true</strong>;
<a name="202" href="#202">202</a>             }
<a name="203" href="#203">203</a>         }
<a name="204" href="#204">204</a> 
<a name="205" href="#205">205</a>         <em class="comment">// Are we supposed to masquerade as the user agent to which restrictions</em>
<a name="206" href="#206">206</a>         <em class="comment">// we follow?</em>
<a name="207" href="#207">207</a>         <strong>if</strong>(honoringPolicy.shouldMasquerade(curi) &amp;&amp; ua != <strong>null</strong> &amp;&amp; !ua.equals(<span class="string">""</span>)) {
<a name="208" href="#208">208</a>             curi.setUserAgent(ua);
<a name="209" href="#209">209</a>         }
<a name="210" href="#210">210</a>         <strong>return</strong> disallow;
<a name="211" href="#211">211</a>     }
<a name="212" href="#212">212</a> 
<a name="213" href="#213">213</a>     <em class="comment">// Methods for object serialization.</em>
<a name="214" href="#214">214</a> 
<a name="215" href="#215">215</a>     <em>/**<em>* If object is DENYALL or ALLOWALL, only the object identity and type</em></em>
<a name="216" href="#216">216</a> <em>     * is written in the serialization stream.</em>
<a name="217" href="#217">217</a> <em>     *</em>
<a name="218" href="#218">218</a> <em>     * @param stream the serialization stream.</em>
<a name="219" href="#219">219</a> <em>     * @throws IOException </em>
<a name="220" href="#220">220</a> <em>     */</em>
<a name="221" href="#221">221</a>     <strong>private</strong> <strong>void</strong> writeObject(ObjectOutputStream stream) throws IOException {
<a name="222" href="#222">222</a>         stream.writeInt(type);
<a name="223" href="#223">223</a>         <strong>if</strong> (type == NORMAL_TYPE) {
<a name="224" href="#224">224</a>             stream.defaultWriteObject();
<a name="225" href="#225">225</a>         }
<a name="226" href="#226">226</a>     }
<a name="227" href="#227">227</a> 
<a name="228" href="#228">228</a>     <em>/**<em>* If object is DENYALL or ALLOWALL, only the object identity and type</em></em>
<a name="229" href="#229">229</a> <em>     * is read from the serialization stream.</em>
<a name="230" href="#230">230</a> <em>     *</em>
<a name="231" href="#231">231</a> <em>     * @param stream the serialization stream.</em>
<a name="232" href="#232">232</a> <em>     * @throws IOException </em>
<a name="233" href="#233">233</a> <em>     * @throws ClassNotFoundException </em>
<a name="234" href="#234">234</a> <em>     */</em>
<a name="235" href="#235">235</a>     <strong>private</strong> <strong>void</strong> readObject(ObjectInputStream stream)
<a name="236" href="#236">236</a>             throws IOException, ClassNotFoundException {
<a name="237" href="#237">237</a>         type = stream.readInt();
<a name="238" href="#238">238</a>         <strong>if</strong> (type == NORMAL_TYPE) {
<a name="239" href="#239">239</a>             stream.defaultReadObject();
<a name="240" href="#240">240</a>         }
<a name="241" href="#241">241</a>     }
<a name="242" href="#242">242</a> 
<a name="243" href="#243">243</a>     <em>/**<em>* If object is DENYALL or ALLOWALL, the object is replaced by constants</em></em>
<a name="244" href="#244">244</a> <em>     * so that check for object equality works.</em>
<a name="245" href="#245">245</a> <em>     * @return Object.</em>
<a name="246" href="#246">246</a> <em>     */</em>
<a name="247" href="#247">247</a>     <strong>private</strong> Object readResolve() {
<a name="248" href="#248">248</a>         <strong>if</strong> (type == NORMAL_TYPE) {
<a name="249" href="#249">249</a>             <strong>return</strong> <strong>this</strong>;
<a name="250" href="#250">250</a>         } <strong>else</strong> <strong>if</strong> (type == ALLOWALL_TYPE) {
<a name="251" href="#251">251</a>             <strong>return</strong> ALLOWALL;
<a name="252" href="#252">252</a>         } <strong>else</strong> <strong>if</strong> (type == DENYALL_TYPE) {
<a name="253" href="#253">253</a>             <strong>return</strong> DENYALL;
<a name="254" href="#254">254</a>         }
<a name="255" href="#255">255</a>         <strong>return</strong> <strong>null</strong>;
<a name="256" href="#256">256</a>     }
<a name="257" href="#257">257</a> 
<a name="258" href="#258">258</a> }
</pre>
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