textutils.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="133" href="#133">133</a>     <strong>public</strong> <strong>static</strong> <strong>boolean</strong> matches(String pattern, CharSequence input) {
<a name="134" href="#134">134</a>         Matcher m = getMatcher(pattern, input);
<a name="135" href="#135">135</a>         <strong>boolean</strong> res = m.matches();
<a name="136" href="#136">136</a>         recycleMatcher(m);
<a name="137" href="#137">137</a>         <strong>return</strong> res;
<a name="138" href="#138">138</a>     }
<a name="139" href="#139">139</a> 
<a name="140" href="#140">140</a>     <em>/**<em>*</em></em>
<a name="141" href="#141">141</a> <em>     * Utility method using a precompiled pattern instead of using the split</em>
<a name="142" href="#142">142</a> <em>     * method of the String class.</em>
<a name="143" href="#143">143</a> <em>     * </em>
<a name="144" href="#144">144</a> <em>     * @see java.util.regex.Pattern</em>
<a name="145" href="#145">145</a> <em>     * @param pattern precompiled Pattern to split by</em>
<a name="146" href="#146">146</a> <em>     * @param input the character sequence to split</em>
<a name="147" href="#147">147</a> <em>     * @return array of Strings split by pattern</em>
<a name="148" href="#148">148</a> <em>     */</em>
<a name="149" href="#149">149</a>     <strong>public</strong> <strong>static</strong> String[] split(String pattern, CharSequence input) {
<a name="150" href="#150">150</a>         Matcher m = getMatcher(pattern,input);
<a name="151" href="#151">151</a>         String[] retVal = m.pattern().split(input); 
<a name="152" href="#152">152</a>         recycleMatcher(m);
<a name="153" href="#153">153</a>         <strong>return</strong> retVal;
<a name="154" href="#154">154</a>     }
<a name="155" href="#155">155</a>     
<a name="156" href="#156">156</a>     <em>/**<em>*</em></em>
<a name="157" href="#157">157</a> <em>     * @param s String to find first word in (Words are delimited by</em>
<a name="158" href="#158">158</a> <em>     * whitespace).</em>
<a name="159" href="#159">159</a> <em>     * @return First word in the passed string else null if no word found.</em>
<a name="160" href="#160">160</a> <em>     */</em>
<a name="161" href="#161">161</a>     <strong>public</strong> <strong>static</strong> String getFirstWord(String s) {
<a name="162" href="#162">162</a>         Matcher m = getMatcher(FIRSTWORD, s);
<a name="163" href="#163">163</a>         String retVal = (m != <strong>null</strong> &amp;&amp; m.matches())? m.group(1): <strong>null</strong>;
<a name="164" href="#164">164</a>         recycleMatcher(m);
<a name="165" href="#165">165</a>         <strong>return</strong> retVal;
<a name="166" href="#166">166</a>     }
<a name="167" href="#167">167</a> 
<a name="168" href="#168">168</a>     <em>/**<em>*</em></em>
<a name="169" href="#169">169</a> <em>     * Escapes a string so that it can be passed as an argument to a javscript</em>
<a name="170" href="#170">170</a> <em>     * in a JSP page. This method takes a string and returns the same string</em>
<a name="171" href="#171">171</a> <em>     * with any single quote escaped by prepending the character with a</em>
<a name="172" href="#172">172</a> <em>     * backslash. Linebreaks are also replaced with '\n'.  Also,</em>
<a name="173" href="#173">173</a> <em>     * less-than signs and ampersands are replaced with HTML entities.</em>
<a name="174" href="#174">174</a> <em>     * </em>
<a name="175" href="#175">175</a> <em>     * @param s The string to escape</em>
<a name="176" href="#176">176</a> <em>     * @return The same string escaped.</em>
<a name="177" href="#177">177</a> <em>     */</em>
<a name="178" href="#178">178</a>     <strong>public</strong> <strong>static</strong> String escapeForHTMLJavascript(String s) {
<a name="179" href="#179">179</a>         <strong>return</strong> escapeForHTML(StringEscapeUtils.escapeJavaScript(s));
<a name="180" href="#180">180</a>     }
<a name="181" href="#181">181</a>     
<a name="182" href="#182">182</a>     <em>/**<em>*</em></em>
<a name="183" href="#183">183</a> <em>     * Escapes a string so that it can be placed inside XML/HTML attribute.</em>
<a name="184" href="#184">184</a> <em>     * Replaces ampersand, less-than, greater-than, single-quote, and </em>
<a name="185" href="#185">185</a> <em>     * double-quote with escaped versions.</em>
<a name="186" href="#186">186</a> <em>     * @param s The string to escape</em>
<a name="187" href="#187">187</a> <em>     * @return The same string escaped.</em>
<a name="188" href="#188">188</a> <em>     */</em>
<a name="189" href="#189">189</a>     <strong>public</strong> <strong>static</strong> String escapeForMarkupAttribute(String s) {
<a name="190" href="#190">190</a>         <strong>return</strong> StringEscapeUtils.escapeXml(s);
<a name="191" href="#191">191</a>     }
<a name="192" href="#192">192</a>     
<a name="193" href="#193">193</a>     <em>/**<em>*</em></em>
<a name="194" href="#194">194</a> <em>     * Minimally escapes a string so that it can be placed inside XML/HTML</em>
<a name="195" href="#195">195</a> <em>     * attribute.</em>
<a name="196" href="#196">196</a> <em>     * Escapes lt and amp.</em>
<a name="197" href="#197">197</a> <em>     * @param s The string to escape</em>
<a name="198" href="#198">198</a> <em>     * @return The same string escaped.</em>
<a name="199" href="#199">199</a> <em>     */</em>
<a name="200" href="#200">200</a>     <strong>public</strong> <strong>static</strong> String escapeForHTML(String s) {
<a name="201" href="#201">201</a>         <em class="comment">// TODO: do this in a single pass instead of creating 5 junk strings</em>
<a name="202" href="#202">202</a>         String escaped = s.replaceAll(<span class="string">"&amp;"</span>,<span class="string">"&amp;amp;"</span>);
<a name="203" href="#203">203</a>         <strong>return</strong> escaped.replaceAll(<span class="string">"&lt;"</span>,<span class="string">"&amp;lt;"</span>);
<a name="204" href="#204">204</a>     }
<a name="205" href="#205">205</a> 
<a name="206" href="#206">206</a>     <em>/**<em>*</em></em>
<a name="207" href="#207">207</a> <em>     * Utility method for writing a (potentially large) String to a JspWriter,</em>
<a name="208" href="#208">208</a> <em>     * escaping it for HTML display, without constructing another large String</em>
<a name="209" href="#209">209</a> <em>     * of the whole content. </em>
<a name="210" href="#210">210</a> <em>     * @param s String to write</em>
<a name="211" href="#211">211</a> <em>     * @param out destination JspWriter</em>
<a name="212" href="#212">212</a> <em>     * @throws IOException</em>
<a name="213" href="#213">213</a> <em>     */</em>
<a name="214" href="#214">214</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> writeEscapedForHTML(String s, JspWriter out)
<a name="215" href="#215">215</a>     throws IOException {
<a name="216" href="#216">216</a>         BufferedReader reader = <strong>new</strong> BufferedReader(<strong>new</strong> StringReader(s));
<a name="217" href="#217">217</a>         String line;
<a name="218" href="#218">218</a>         <strong>while</strong>((line=reader.readLine()) != <strong>null</strong>){
<a name="219" href="#219">219</a>             out.println(StringEscapeUtils.escapeHtml(line));
<a name="220" href="#220">220</a>         }
<a name="221" href="#221">221</a>     }
<a name="222" href="#222">222</a>     
<a name="223" href="#223">223</a>     <em>/**<em>*</em></em>
<a name="224" href="#224">224</a> <em>     * Replaces HTML Entity Encodings.</em>
<a name="225" href="#225">225</a> <em>     * @param cs The CharSequence to remove html codes from</em>
<a name="226" href="#226">226</a> <em>     * @return the same CharSequence or an escaped String.</em>
<a name="227" href="#227">227</a> <em>     */</em>
<a name="228" href="#228">228</a>     <strong>public</strong> <strong>static</strong> CharSequence unescapeHtml(<strong>final</strong> CharSequence cs) {
<a name="229" href="#229">229</a>         <strong>if</strong> (cs == <strong>null</strong>) {
<a name="230" href="#230">230</a>             <strong>return</strong> cs;
<a name="231" href="#231">231</a>         }
<a name="232" href="#232">232</a>         
<a name="233" href="#233">233</a>         <em class="comment">// If both of these do not equal zero, then cs has entity code</em>
<a name="234" href="#234">234</a>         <strong>int</strong> startEntityCode = -1;
<a name="235" href="#235">235</a>         <strong>int</strong> endEntityCode = -1;
<a name="236" href="#236">236</a>     
<a name="237" href="#237">237</a>         <em class="comment">// Check for encodings, make sure start and end are within certain range</em>
<a name="238" href="#238">238</a>         <strong>for</strong> (<strong>int</strong> i = 0; i &lt; cs.length(); i++) {
<a name="239" href="#239">239</a>             <strong>if</strong> (cs.charAt(i) == '&amp;') {
<a name="240" href="#240">240</a>                 startEntityCode = i;
<a name="241" href="#241">241</a>             } <strong>else</strong> <strong>if</strong> (cs.charAt(i) == ';' &amp;&amp; startEntityCode >= 0 &amp;&amp;
<a name="242" href="#242">242</a>                     i > startEntityCode &amp;&amp;
<a name="243" href="#243">243</a>                     ((i - startEntityCode) &lt; MAX_ENTITY_WIDTH)) {
<a name="244" href="#244">244</a>                 endEntityCode = i;
<a name="245" href="#245">245</a>             }
<a name="246" href="#246">246</a>         }
<a name="247" href="#247">247</a> 
<a name="248" href="#248">248</a>         <strong>return</strong> (startEntityCode != 0 &amp;&amp; endEntityCode != 0)?
<a name="249" href="#249">249</a>             StringEscapeUtils.unescapeHtml(cs.toString()): cs;
<a name="250" href="#250">250</a>     }
<a name="251" href="#251">251</a>     
<a name="252" href="#252">252</a>     <em>/**<em>*</em></em>
<a name="253" href="#253">253</a> <em>     * @param message Message to put at top of the string returned. May be</em>
<a name="254" href="#254">254</a> <em>     * null.</em>
<a name="255" href="#255">255</a> <em>     * @param e Exception to write into a string.</em>
<a name="256" href="#256">256</a> <em>     * @return Return formatted string made of passed message and stack trace</em>
<a name="257" href="#257">257</a> <em>     * of passed exception.</em>
<a name="258" href="#258">258</a> <em>     */</em>
<a name="259" href="#259">259</a>     <strong>public</strong> <strong>static</strong> String exceptionToString(String  message, Throwable e) {
<a name="260" href="#260">260</a>         StringWriter sw = <strong>new</strong> StringWriter();
<a name="261" href="#261">261</a>         <strong>if</strong> (message == <strong>null</strong> || message.length() == 0) {
<a name="262" href="#262">262</a>             sw.write(message);
<a name="263" href="#263">263</a>             sw.write(<span class="string">"\n"</span>);
<a name="264" href="#264">264</a>         }
<a name="265" href="#265">265</a>         e.printStackTrace(<strong>new</strong> PrintWriter(sw));
<a name="266" href="#266">266</a>         <strong>return</strong> sw.toString();
<a name="267" href="#267">267</a>     }
<a name="268" href="#268">268</a> }
</pre>
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