dateparser.html

解析RSS工具源码

<a name="141" href="#141">141</a>                 <em class="comment">//System.out.println("pp["+pp.getIndex()+"] s["+sDate+" m["+masks[i]+"] d["+d+"]");</em>
<a name="142" href="#142">142</a>             }
<a name="143" href="#143">143</a>             <strong>catch</strong> (Exception ex1) {
<a name="144" href="#144">144</a>                 <em class="comment">//System.out.println("s: "+sDate+" m: "+masks[i]+" d: "+null);</em>
<a name="145" href="#145">145</a>             }
<a name="146" href="#146">146</a>         }
<a name="147" href="#147">147</a>         <strong>return</strong> d;
<a name="148" href="#148">148</a>     }
<a name="149" href="#149">149</a> 
<a name="150" href="#150">150</a>     <em>/**<em>*</em></em>
<a name="151" href="#151">151</a> <em>     * Parses a Date out of a String with a date in RFC822 format.</em>
<a name="152" href="#152">152</a> <em>     * &lt;p/></em>
<a name="153" href="#153">153</a> <em>     * It parsers the following formats:</em>
<a name="154" href="#154">154</a> <em>     * &lt;ul></em>
<a name="155" href="#155">155</a> <em>     *   &lt;li>"EEE, dd MMM yyyy HH:mm:ss z"&lt;/li></em>
<a name="156" href="#156">156</a> <em>     *   &lt;li>"EEE, dd MMM yyyy HH:mm z"&lt;/li></em>
<a name="157" href="#157">157</a> <em>     *   &lt;li>"EEE, dd MMM yy HH:mm:ss z"&lt;/li></em>
<a name="158" href="#158">158</a> <em>     *   &lt;li>"EEE, dd MMM yy HH:mm z"&lt;/li></em>
<a name="159" href="#159">159</a> <em>     *   &lt;li>"dd MMM yyyy HH:mm:ss z"&lt;/li></em>
<a name="160" href="#160">160</a> <em>     *   &lt;li>"dd MMM yyyy HH:mm z"&lt;/li></em>
<a name="161" href="#161">161</a> <em>     *   &lt;li>"dd MMM yy HH:mm:ss z"&lt;/li></em>
<a name="162" href="#162">162</a> <em>     *   &lt;li>"dd MMM yy HH:mm z"&lt;/li></em>
<a name="163" href="#163">163</a> <em>     * &lt;/ul></em>
<a name="164" href="#164">164</a> <em>     * &lt;p/></em>
<a name="165" href="#165">165</a> <em>     * Refer to the java.text.SimpleDateFormat javadocs for details on the format of each element.</em>
<a name="166" href="#166">166</a> <em>     * &lt;p/></em>
<a name="167" href="#167">167</a> <em>     * @param sDate string to parse for a date.</em>
<a name="168" href="#168">168</a> <em>     * @return the Date represented by the given RFC822 string.</em>
<a name="169" href="#169">169</a> <em>     *         It returns &lt;b>null&lt;/b> if it was not possible to parse the given string into a Date.</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> <strong>static</strong> Date parseRFC822(String sDate) {
<a name="173" href="#173">173</a>         <strong>int</strong> utIndex = sDate.indexOf(<span class="string">" UT"</span>);
<a name="174" href="#174">174</a>         <strong>if</strong> (utIndex>-1) {
<a name="175" href="#175">175</a>             String pre = sDate.substring(0,utIndex);
<a name="176" href="#176">176</a>             String post = sDate.substring(utIndex+3);
<a name="177" href="#177">177</a>             sDate = pre + <span class="string">" GMT"</span> + post;
<a name="178" href="#178">178</a>         }
<a name="179" href="#179">179</a>         <strong>return</strong> parseUsingMask(RFC822_MASKS,sDate);
<a name="180" href="#180">180</a>     }
<a name="181" href="#181">181</a> 
<a name="182" href="#182">182</a> 
<a name="183" href="#183">183</a>     <em>/**<em>*</em></em>
<a name="184" href="#184">184</a> <em>     * Parses a Date out of a String with a date in W3C date-time format.</em>
<a name="185" href="#185">185</a> <em>     * &lt;p/></em>
<a name="186" href="#186">186</a> <em>     * It parsers the following formats:</em>
<a name="187" href="#187">187</a> <em>     * &lt;ul></em>
<a name="188" href="#188">188</a> <em>     *   &lt;li>"yyyy-MM-dd'T'HH:mm:ssz"&lt;/li></em>
<a name="189" href="#189">189</a> <em>     *   &lt;li>"yyyy-MM-dd'T'HH:mmz"&lt;/li></em>
<a name="190" href="#190">190</a> <em>     *   &lt;li>"yyyy-MM-dd"&lt;/li></em>
<a name="191" href="#191">191</a> <em>     *   &lt;li>"yyyy-MM"&lt;/li></em>
<a name="192" href="#192">192</a> <em>     *   &lt;li>"yyyy"&lt;/li></em>
<a name="193" href="#193">193</a> <em>     * &lt;/ul></em>
<a name="194" href="#194">194</a> <em>     * &lt;p/></em>
<a name="195" href="#195">195</a> <em>     * Refer to the java.text.SimpleDateFormat javadocs for details on the format of each element.</em>
<a name="196" href="#196">196</a> <em>     * &lt;p/></em>
<a name="197" href="#197">197</a> <em>     * @param sDate string to parse for a date.</em>
<a name="198" href="#198">198</a> <em>     * @return the Date represented by the given W3C date-time string.</em>
<a name="199" href="#199">199</a> <em>     *         It returns &lt;b>null&lt;/b> if it was not possible to parse the given string into a Date.</em>
<a name="200" href="#200">200</a> <em>     *</em>
<a name="201" href="#201">201</a> <em>     */</em>
<a name="202" href="#202">202</a>     <strong>public</strong> <strong>static</strong> Date parseW3CDateTime(String sDate) {
<a name="203" href="#203">203</a>         <em class="comment">// if sDate has time on it, it injects 'GTM' before de TZ displacement to</em>
<a name="204" href="#204">204</a>         <em class="comment">// allow the SimpleDateFormat parser to parse it properly</em>
<a name="205" href="#205">205</a>         <strong>int</strong> tIndex = sDate.indexOf(<span class="string">"T"</span>);
<a name="206" href="#206">206</a>         <strong>if</strong> (tIndex>-1) {
<a name="207" href="#207">207</a>             <strong>if</strong> (sDate.endsWith(<span class="string">"Z"</span>)) {
<a name="208" href="#208">208</a>                 sDate = sDate.substring(0,sDate.length()-1)+<span class="string">"+00:00"</span>;
<a name="209" href="#209">209</a>             }
<a name="210" href="#210">210</a>             <strong>int</strong> tzdIndex = sDate.indexOf(<span class="string">"+"</span>,tIndex);
<a name="211" href="#211">211</a>             <strong>if</strong> (tzdIndex==-1) {
<a name="212" href="#212">212</a>                 tzdIndex = sDate.indexOf(<span class="string">"-"</span>,tIndex);
<a name="213" href="#213">213</a>             }
<a name="214" href="#214">214</a>             <strong>if</strong> (tzdIndex>-1) {
<a name="215" href="#215">215</a>                 String pre = sDate.substring(0,tzdIndex);
<a name="216" href="#216">216</a>                 <strong>int</strong> secFraction = pre.indexOf(<span class="string">","</span>);
<a name="217" href="#217">217</a>                 <strong>if</strong> (secFraction>-1) {
<a name="218" href="#218">218</a>                     pre = pre.substring(0,secFraction);
<a name="219" href="#219">219</a>                 }
<a name="220" href="#220">220</a>                 String post = sDate.substring(tzdIndex);
<a name="221" href="#221">221</a>                 sDate = pre + <span class="string">"GMT"</span> + post;
<a name="222" href="#222">222</a>             }
<a name="223" href="#223">223</a>         }
<a name="224" href="#224">224</a>         <strong>else</strong> {
<a name="225" href="#225">225</a>             sDate += <span class="string">"T00:00GMT"</span>;
<a name="226" href="#226">226</a>         }
<a name="227" href="#227">227</a>         <strong>return</strong> parseUsingMask(W3CDATETIME_MASKS,sDate);
<a name="228" href="#228">228</a>     }
<a name="229" href="#229">229</a> 
<a name="230" href="#230">230</a> 
<a name="231" href="#231">231</a>     <em>/**<em>*</em></em>
<a name="232" href="#232">232</a> <em>     * Parses a Date out of a String with a date in W3C date-time format or</em>
<a name="233" href="#233">233</a> <em>     * in a RFC822 format.</em>
<a name="234" href="#234">234</a> <em>     * &lt;p></em>
<a name="235" href="#235">235</a> <em>     * @param sDate string to parse for a date.</em>
<a name="236" href="#236">236</a> <em>     * @return the Date represented by the given W3C date-time string.</em>
<a name="237" href="#237">237</a> <em>     *         It returns &lt;b>null&lt;/b> if it was not possible to parse the given string into a Date.</em>
<a name="238" href="#238">238</a> <em>     *</em>
<a name="239" href="#239">239</a> <em>     * */</em>
<a name="240" href="#240">240</a>     <strong>public</strong> <strong>static</strong> Date parseDate(String sDate) {
<a name="241" href="#241">241</a>         Date d = parseW3CDateTime(sDate);
<a name="242" href="#242">242</a>         <strong>if</strong> (d==<strong>null</strong>) {
<a name="243" href="#243">243</a>             d = parseRFC822(sDate);
<a name="244" href="#244">244</a>             <strong>if</strong> (d==<strong>null</strong> &amp;&amp; ADDITIONAL_MASKS.length>0) {
<a name="245" href="#245">245</a>                 d = parseUsingMask(ADDITIONAL_MASKS,sDate);
<a name="246" href="#246">246</a>             }
<a name="247" href="#247">247</a>         }
<a name="248" href="#248">248</a>         <strong>return</strong> d;
<a name="249" href="#249">249</a>     }
<a name="250" href="#250">250</a> 
<a name="251" href="#251">251</a>     <em>/**<em>*</em></em>
<a name="252" href="#252">252</a> <em>     * create a RFC822 representation of a date.</em>
<a name="253" href="#253">253</a> <em>     * &lt;p/></em>
<a name="254" href="#254">254</a> <em>     * Refer to the java.text.SimpleDateFormat javadocs for details on the format of each element.</em>
<a name="255" href="#255">255</a> <em>     * &lt;p/></em>
<a name="256" href="#256">256</a> <em>     * @param date Date to parse</em>
<a name="257" href="#257">257</a> <em>     * @return the RFC822 represented by the given Date</em>
<a name="258" href="#258">258</a> <em>     *         It returns &lt;b>null&lt;/b> if it was not possible to parse the date.</em>
<a name="259" href="#259">259</a> <em>     *</em>
<a name="260" href="#260">260</a> <em>     */</em>
<a name="261" href="#261">261</a>     <strong>public</strong> <strong>static</strong> String formatRFC822(Date date) {
<a name="262" href="#262">262</a>         SimpleDateFormat dateFormater = <strong>new</strong> SimpleDateFormat(<span class="string">"EEE, dd MMM yyyy HH:mm:ss 'GMT'"</span>,Locale.US);
<a name="263" href="#263">263</a>         dateFormater.setTimeZone(TimeZone.getTimeZone(<span class="string">"GMT"</span>));
<a name="264" href="#264">264</a>         <strong>return</strong> dateFormater.format(date);
<a name="265" href="#265">265</a>     }
<a name="266" href="#266">266</a> 
<a name="267" href="#267">267</a>     <em>/**<em>*</em></em>
<a name="268" href="#268">268</a> <em>     * create a W3C Date Time representation of a date.</em>
<a name="269" href="#269">269</a> <em>     * &lt;p/></em>
<a name="270" href="#270">270</a> <em>     * Refer to the java.text.SimpleDateFormat javadocs for details on the format of each element.</em>
<a name="271" href="#271">271</a> <em>     * &lt;p/></em>
<a name="272" href="#272">272</a> <em>     * @param date Date to parse</em>
<a name="273" href="#273">273</a> <em>     * @return the W3C Date Time represented by the given Date</em>
<a name="274" href="#274">274</a> <em>     *         It returns &lt;b>null&lt;/b> if it was not possible to parse the date.</em>
<a name="275" href="#275">275</a> <em>     *</em>
<a name="276" href="#276">276</a> <em>     */</em>
<a name="277" href="#277">277</a>     <strong>public</strong> <strong>static</strong> String formatW3CDateTime(Date date) {
<a name="278" href="#278">278</a>         SimpleDateFormat dateFormater = <strong>new</strong> SimpleDateFormat(<span class="string">"yyyy-MM-dd'T'HH:mm:ss'Z'"</span>,Locale.US);
<a name="279" href="#279">279</a>         dateFormater.setTimeZone(TimeZone.getTimeZone(<span class="string">"GMT"</span>));
<a name="280" href="#280">280</a>         <strong>return</strong> dateFormater.format(date);
<a name="281" href="#281">281</a>     }
<a name="282" href="#282">282</a> 
<a name="283" href="#283">283</a> }
</pre>
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