wirefeedinput.html

解析RSS工具源码

<a name="154" href="#154">154</a>             reader = <strong>new</strong> <a href="../../../../com/sun/syndication/io/impl/XmlFixerReader.html">XmlFixerReader</a>(reader);
<a name="155" href="#155">155</a>         }
<a name="156" href="#156">156</a>         feed = build(reader);
<a name="157" href="#157">157</a>         reader.close();
<a name="158" href="#158">158</a>         <strong>return</strong> feed;
<a name="159" href="#159">159</a>     }
<a name="160" href="#160">160</a> 
<a name="161" href="#161">161</a>     <em>/**<em>*</em></em>
<a name="162" href="#162">162</a> <em>     * Builds an WireFeed (RSS or Atom) from an Reader.</em>
<a name="163" href="#163">163</a> <em>     * &lt;p></em>
<a name="164" href="#164">164</a> <em>     * NOTE: This method delages to the 'AsbtractFeed WireFeedInput#build(org.jdom.Document)'.</em>
<a name="165" href="#165">165</a> <em>     * &lt;p></em>
<a name="166" href="#166">166</a> <em>     * @param reader Reader to read to create the WireFeed.</em>
<a name="167" href="#167">167</a> <em>     * @return the WireFeed read from the Reader.</em>
<a name="168" href="#168">168</a> <em>     * @throws IllegalArgumentException thrown if feed type could not be understood by any of the underlying parsers.</em>
<a name="169" href="#169">169</a> <em>     * @throws FeedException if the feed could not be parsed</em>
<a name="170" href="#170">170</a> <em>     *</em>
<a name="171" href="#171">171</a> <em>     */</em>
<a name="172" href="#172">172</a>     <strong>public</strong> <a href="../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> build(Reader reader) throws IllegalArgumentException,FeedException {
<a name="173" href="#173">173</a>     	SAXBuilder saxBuilder = createSAXBuilder();
<a name="174" href="#174">174</a>         <strong>try</strong> {
<a name="175" href="#175">175</a>             <strong>if</strong> (_xmlHealerOn) {
<a name="176" href="#176">176</a>                 reader = <strong>new</strong> <a href="../../../../com/sun/syndication/io/impl/XmlFixerReader.html">XmlFixerReader</a>(reader);
<a name="177" href="#177">177</a>             }            
<a name="178" href="#178">178</a>             Document document = saxBuilder.build(reader);
<a name="179" href="#179">179</a>             <strong>return</strong> build(document);
<a name="180" href="#180">180</a>         }
<a name="181" href="#181">181</a>         <strong>catch</strong> (JDOMParseException ex) {
<a name="182" href="#182">182</a>             <strong>throw</strong> <strong>new</strong> <a href="../../../../com/sun/syndication/io/ParsingFeedException.html">ParsingFeedException</a>(<span class="string">"Invalid XML: "</span> + ex.getMessage(), ex);
<a name="183" href="#183">183</a>         }
<a name="184" href="#184">184</a>         <strong>catch</strong> (Exception ex) {
<a name="185" href="#185">185</a>             <strong>throw</strong> <strong>new</strong> <a href="../../../../com/sun/syndication/io/ParsingFeedException.html">ParsingFeedException</a>(<span class="string">"Invalid XML"</span>,ex);
<a name="186" href="#186">186</a>         }
<a name="187" href="#187">187</a>     }
<a name="188" href="#188">188</a> 
<a name="189" href="#189">189</a>     <em>/**<em>*</em></em>
<a name="190" href="#190">190</a> <em>     * Builds an WireFeed (RSS or Atom) from an W3C SAX InputSource.</em>
<a name="191" href="#191">191</a> <em>     * &lt;p></em>
<a name="192" href="#192">192</a> <em>     * NOTE: This method delages to the 'AsbtractFeed WireFeedInput#build(org.jdom.Document)'.</em>
<a name="193" href="#193">193</a> <em>     * &lt;p></em>
<a name="194" href="#194">194</a> <em>     * @param is W3C SAX InputSource to read to create the WireFeed.</em>
<a name="195" href="#195">195</a> <em>     * @return the WireFeed read from the W3C SAX InputSource.</em>
<a name="196" href="#196">196</a> <em>     * @throws IllegalArgumentException thrown if feed type could not be understood by any of the underlying parsers.</em>
<a name="197" href="#197">197</a> <em>     * @throws FeedException if the feed could not be parsed</em>
<a name="198" href="#198">198</a> <em>     *</em>
<a name="199" href="#199">199</a> <em>     */</em>
<a name="200" href="#200">200</a>     <strong>public</strong> <a href="../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> build(InputSource is) throws IllegalArgumentException,FeedException {
<a name="201" href="#201">201</a>     	SAXBuilder saxBuilder = createSAXBuilder();
<a name="202" href="#202">202</a>         <strong>try</strong> {
<a name="203" href="#203">203</a>             Document document = saxBuilder.build(is);
<a name="204" href="#204">204</a>             <strong>return</strong> build(document);
<a name="205" href="#205">205</a>         }
<a name="206" href="#206">206</a>         <strong>catch</strong> (JDOMParseException ex) {
<a name="207" href="#207">207</a>             <strong>throw</strong> <strong>new</strong> <a href="../../../../com/sun/syndication/io/ParsingFeedException.html">ParsingFeedException</a>(<span class="string">"Invalid XML: "</span> + ex.getMessage(), ex);
<a name="208" href="#208">208</a>         }
<a name="209" href="#209">209</a>         <strong>catch</strong> (Exception ex) {
<a name="210" href="#210">210</a>             <strong>throw</strong> <strong>new</strong> <a href="../../../../com/sun/syndication/io/ParsingFeedException.html">ParsingFeedException</a>(<span class="string">"Invalid XML"</span>,ex);
<a name="211" href="#211">211</a>         }
<a name="212" href="#212">212</a>     }
<a name="213" href="#213">213</a> 
<a name="214" href="#214">214</a>     <em>/**<em>*</em></em>
<a name="215" href="#215">215</a> <em>     * Builds an WireFeed (RSS or Atom) from an W3C DOM document.</em>
<a name="216" href="#216">216</a> <em>     * &lt;p></em>
<a name="217" href="#217">217</a> <em>     * NOTE: This method delages to the 'AsbtractFeed WireFeedInput#build(org.jdom.Document)'.</em>
<a name="218" href="#218">218</a> <em>     * &lt;p></em>
<a name="219" href="#219">219</a> <em>     * @param document W3C DOM document to read to create the WireFeed.</em>
<a name="220" href="#220">220</a> <em>     * @return the WireFeed read from the W3C DOM document.</em>
<a name="221" href="#221">221</a> <em>     * @throws IllegalArgumentException thrown if feed type could not be understood by any of the underlying parsers.</em>
<a name="222" href="#222">222</a> <em>     * @throws FeedException if the feed could not be parsed</em>
<a name="223" href="#223">223</a> <em>     *</em>
<a name="224" href="#224">224</a> <em>     */</em>
<a name="225" href="#225">225</a>     <strong>public</strong> <a href="../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> build(org.w3c.dom.Document document) throws IllegalArgumentException,FeedException {
<a name="226" href="#226">226</a>         DOMBuilder domBuilder = <strong>new</strong> DOMBuilder();        
<a name="227" href="#227">227</a>         <strong>try</strong> {
<a name="228" href="#228">228</a>             Document jdomDoc = domBuilder.build(document);
<a name="229" href="#229">229</a>             <strong>return</strong> build(jdomDoc);
<a name="230" href="#230">230</a>         }
<a name="231" href="#231">231</a>         <strong>catch</strong> (Exception ex) {
<a name="232" href="#232">232</a>             <strong>throw</strong> <strong>new</strong> <a href="../../../../com/sun/syndication/io/ParsingFeedException.html">ParsingFeedException</a>(<span class="string">"Invalid XML"</span>,ex);
<a name="233" href="#233">233</a>         }
<a name="234" href="#234">234</a>     }
<a name="235" href="#235">235</a> 
<a name="236" href="#236">236</a>     <em>/**<em>*</em></em>
<a name="237" href="#237">237</a> <em>     * Builds an WireFeed (RSS or Atom) from an JDOM document.</em>
<a name="238" href="#238">238</a> <em>     * &lt;p></em>
<a name="239" href="#239">239</a> <em>     * NOTE: All other build methods delegate to this method.</em>
<a name="240" href="#240">240</a> <em>     * &lt;p></em>
<a name="241" href="#241">241</a> <em>     * @param document JDOM document to read to create the WireFeed.</em>
<a name="242" href="#242">242</a> <em>     * @return the WireFeed read from the JDOM document.</em>
<a name="243" href="#243">243</a> <em>     * @throws IllegalArgumentException thrown if feed type could not be understood by any of the underlying parsers.</em>
<a name="244" href="#244">244</a> <em>     * @throws FeedException if the feed could not be parsed</em>
<a name="245" href="#245">245</a> <em>     *</em>
<a name="246" href="#246">246</a> <em>     */</em>
<a name="247" href="#247">247</a>     <strong>public</strong> <a href="../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> build(Document document) throws IllegalArgumentException,FeedException {
<a name="248" href="#248">248</a>         <a href="../../../../com/sun/syndication/io/WireFeedParser.html">WireFeedParser</a> parser = FEED_PARSERS.getParserFor(document);
<a name="249" href="#249">249</a>         <strong>if</strong> (parser==<strong>null</strong>) {
<a name="250" href="#250">250</a>             <strong>throw</strong> <strong>new</strong> IllegalArgumentException(<span class="string">"Invalid document"</span>);
<a name="251" href="#251">251</a>         }
<a name="252" href="#252">252</a>         <strong>return</strong> parser.parse(document, _validate);
<a name="253" href="#253">253</a>     }
<a name="254" href="#254">254</a> 
<a name="255" href="#255">255</a>     <em>/**<em>*</em></em>
<a name="256" href="#256">256</a> <em>     * Creates and sets up a org.jdom.input.SAXBuilder for parsing.</em>
<a name="257" href="#257">257</a> <em>     * </em>
<a name="258" href="#258">258</a> <em>     * @return a new org.jdom.input.SAXBuilder object</em>
<a name="259" href="#259">259</a> <em>     */</em>
<a name="260" href="#260">260</a>     <strong>protected</strong> <a href="../../../../com/sun/syndication/io/SAXBuilder.html">SAXBuilder</a> createSAXBuilder() {
<a name="261" href="#261">261</a>         <a href="../../../../com/sun/syndication/io/SAXBuilder.html">SAXBuilder</a> saxBuilder = <strong>new</strong> <a href="../../../../com/sun/syndication/io/SAXBuilder.html">SAXBuilder</a>(_validate);        
<a name="262" href="#262">262</a>         saxBuilder.setEntityResolver(RESOLVER);
<a name="263" href="#263">263</a> 
<a name="264" href="#264">264</a>         <em class="comment">//</em>
<a name="265" href="#265">265</a>         <em class="comment">// This code is needed to fix the security problem outlined in http://www.securityfocus.com/archive/1/297714</em>
<a name="266" href="#266">266</a>         <em class="comment">//</em>
<a name="267" href="#267">267</a>         <em class="comment">// Unfortunately there isn't an easy way to check if an XML parser supports a particular feature, so</em>
<a name="268" href="#268">268</a>         <em class="comment">// we need to set it and catch the exception if it fails. We also need to subclass the JDom SAXBuilder </em>
<a name="269" href="#269">269</a>         <em class="comment">// class in order to get access to the underlying SAX parser - otherwise the features don't get set until</em>
<a name="270" href="#270">270</a>         <em class="comment">// we are already building the document, by which time it's too late to fix the problem.</em>
<a name="271" href="#271">271</a>         <em class="comment">//</em>
<a name="272" href="#272">272</a>         <em class="comment">// Crimson is one parser which is known not to support these features.</em>
<a name="273" href="#273">273</a> 		<strong>try</strong> {
<a name="274" href="#274">274</a> 			XMLReader parser = saxBuilder.createParser();
<a name="275" href="#275">275</a> 			<strong>try</strong> {				
<a name="276" href="#276">276</a> 				parser.setFeature(<span class="string">"http://xml.org/sax/features/external-general-entities"</span>, false);
<a name="277" href="#277">277</a> 				saxBuilder.setFeature(<span class="string">"http://xml.org/sax/features/external-general-entities"</span>, false);
<a name="278" href="#278">278</a> 			} <strong>catch</strong> (SAXNotRecognizedException e) {
<a name="279" href="#279">279</a> 				<em class="comment">// ignore</em>
<a name="280" href="#280">280</a> 			} <strong>catch</strong> (SAXNotSupportedException e) {
<a name="281" href="#281">281</a> 				<em class="comment">// ignore</em>
<a name="282" href="#282">282</a> 			}
<a name="283" href="#283">283</a> 			
<a name="284" href="#284">284</a> 			<strong>try</strong> {
<a name="285" href="#285">285</a> 				parser.setFeature(<span class="string">"http://xml.org/sax/features/external-parameter-entities"</span>, false);
<a name="286" href="#286">286</a> 				saxBuilder.setFeature(<span class="string">"http://xml.org/sax/features/external-parameter-entities"</span>, false);
<a name="287" href="#287">287</a> 			} <strong>catch</strong> (SAXNotRecognizedException e) {
<a name="288" href="#288">288</a> 				<em class="comment">// ignore</em>
<a name="289" href="#289">289</a> 			} <strong>catch</strong> (SAXNotSupportedException e) {
<a name="290" href="#290">290</a> 				<em class="comment">// ignore</em>
<a name="291" href="#291">291</a> 			}
<a name="292" href="#292">292</a> 
<a name="293" href="#293">293</a> 			<strong>try</strong> {
<a name="294" href="#294">294</a> 				parser.setFeature(<span class="string">"http://apache.org/xml/features/nonvalidating/load-external-dtd"</span>, false);
<a name="295" href="#295">295</a> 				saxBuilder.setFeature(<span class="string">"http://apache.org/xml/features/nonvalidating/load-external-dtd"</span>, false);
<a name="296" href="#296">296</a> 			} <strong>catch</strong> (SAXNotRecognizedException e) {
<a name="297" href="#297">297</a> 				<em class="comment">// ignore</em>
<a name="298" href="#298">298</a> 			} <strong>catch</strong> (SAXNotSupportedException e) {
<a name="299" href="#299">299</a> 				<em class="comment">// ignore</em>
<a name="300" href="#300">300</a> 			}
<a name="301" href="#301">301</a> 			
<a name="302" href="#302">302</a> 		} <strong>catch</strong> (JDOMException e) {
<a name="303" href="#303">303</a> 			<strong>throw</strong> <strong>new</strong> IllegalStateException(<span class="string">"JDOM could not create a SAX parser"</span>);
<a name="304" href="#304">304</a> 		}
<a name="305" href="#305">305</a> 
<a name="306" href="#306">306</a> 		saxBuilder.setExpandEntities(false);    
<a name="307" href="#307">307</a>         <strong>return</strong> saxBuilder;
<a name="308" href="#308">308</a>     }
<a name="309" href="#309">309</a> }
</pre>
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