壓縮jsp,html中的代碼,去掉所有空白符、換行符
package zj.compress.util; import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; /******************************************* * 壓縮jsp,html中的代碼,去掉所有空白符、換行符 * * @author 張軍 * @version 0.1 * @date 2010-5-13 *******************************************/ public class HtmlCompressor { private static String tempPreBlock = "%%%HTMLCOMPRESS~PRE&&&"; private static String tempTextAreaBlock = "%%%HTMLCOMPRESS~TEXTAREA&&&"; private static String tempScriptBlock = "%%%HTMLCOMPRESS~SCRIPT&&&"; private static String tempStyleBlock = "%%%HTMLCOMPRESS~STYLE&&&"; private static String tempJspBlock = "%%%HTMLCOMPRESS~JSP&&&"; /** * * * @see flag的取值范圍如下: * @see Pattern.CANON_EQ 當且僅當兩個字符的"正規(guī)分解(canonical decomposition)"都完全相同的情況下,才認定匹配。比如用了這個標志之后,表達式"a\u030A"會匹配"?"。默認情況下,不考慮"規(guī) 范相等性(canonical equivalence)"。 * @see Pattern.CASE_INSENSITIVE(?i) 默認情況下,大小寫不明感的匹配只適用于US-ASCII字符集。這個標志能讓表達式忽略大小寫進行匹配。要想對Unicode字符進行大小不明感的匹 配,只要將UNICODE_CASE與這個標志合起來就行了。 * @see Pattern.COMMENTS(?x) 在這種模式下,匹配時會忽略(正則表達式里的)空格字符(譯者注:不是指表達式里的"\\s",而是指表達式里的空格,tab,回車之類)。注釋從#開始,一直到這行結(jié)束。可以通過嵌入式的標志來啟用Unix行模式。 * @see Pattern.DOTALL(?s) 在這種模式下,表達式'.'可以匹配任意字符,包括表示一行的結(jié)束符。默認情況下,表達式'.'不匹配行的結(jié)束符。 * @see Pattern.MULTILINE (?m) 在這種模式下,'^'和'$'分別匹配一行的開始和結(jié)束。此外,'^'仍然匹配字符串的開始,'$'也匹配字符串的結(jié)束。默認情況下,這兩個表達式僅僅匹配字符串的開始和結(jié)束。 * @see Pattern.UNICODE_CASE (?u) 在這個模式下,如果你還啟用了CASE_INSENSITIVE標志,那么它會對Unicode字符進行大小寫不明感的匹配。默認情況下,大小寫不敏感的匹配只適用于US-ASCII字符集。 * @see Pattern.UNIX_LINES(?d) 在這個模式下,只有'\n'才被認作一行的中止,并且與'.','^',以及'$'進行匹配。 */ // 注釋 private static Pattern commentPattern = Pattern.compile("<!--\\s*[^\\[].*?-->", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); // 換行 private static Pattern itsPattern = Pattern.compile(">\\s+?<", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); // pre標簽 private static Pattern prePattern = Pattern.compile("<pre[^>]*?>.*?</pre>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); // textarea標簽 private static Pattern taPattern = Pattern.compile("<textarea[^>]*?>.*?</textarea>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); // jsp標簽 private static Pattern jspPattern = Pattern.compile("<%([^-@][\\w\\W]*?)%>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); // <script></script> private static Pattern scriptPattern = Pattern.compile("(?:<script\\s*>|<script type=['\"]text/javascript['\"]\\s*>)(.*?)</script>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); // style標簽 private static Pattern stylePattern = Pattern.compile("<style[^>()]*?>(.+)</style>", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); // 單行注釋, private static Pattern signleCommentPattern = Pattern.compile("//.*"); // 字符串匹配 private static Pattern stringPattern = Pattern.compile("(\"[^\"\\n]*?\"|'[^'\\n]*?')"); // trim去空格和換行符 private static Pattern trimPattern = Pattern.compile("\\n\\s*", Pattern.MULTILINE); private static Pattern trimPattern2 = Pattern.compile("\\s*\\r", Pattern.MULTILINE); // 多行注釋 private static Pattern multiCommentPattern = Pattern.compile("/\\*.*?\\*/", Pattern.DOTALL | Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); private static String tempSingleCommentBlock = "%%%HTMLCOMPRESS~SINGLECOMMENT&&&"; // //占位符 private static String tempMulitCommentBlock1 = "%%%HTMLCOMPRESS~MULITCOMMENT1&&&"; // /*占位符 private static String tempMulitCommentBlock2 = "%%%HTMLCOMPRESS~MULITCOMMENT2&&&"; // */占位符 public static String compress(String html) throws Exception { if (html == null || html.length() == 0) { return html; } List<String> preBlocks = new ArrayList<String>(); List<String> taBlocks = new ArrayList<String>(); List<String> scriptBlocks = new ArrayList<String>(); List<String> styleBlocks = new ArrayList<String>(); List<String> jspBlocks = new ArrayList<String>(); String result = html; // preserve inline java code Matcher jspMatcher = jspPattern.matcher(result); while (jspMatcher.find()) { jspBlocks.add(jspMatcher.group(0)); } result = jspMatcher.replaceAll(tempJspBlock); // preserve PRE tags Matcher preMatcher = prePattern.matcher(result); while (preMatcher.find()) { preBlocks.add(preMatcher.group(0)); } result = preMatcher.replaceAll(tempPreBlock); // preserve TEXTAREA tags Matcher taMatcher = taPattern.matcher(result); while (taMatcher.find()) { taBlocks.add(taMatcher.group(0)); } result = taMatcher.replaceAll(tempTextAreaBlock); // preserve SCRIPT tags Matcher scriptMatcher = scriptPattern.matcher(result); while (scriptMatcher.find()) { scriptBlocks.add(scriptMatcher.group(0)); } result = scriptMatcher.replaceAll(tempScriptBlock); // don't process inline css Matcher styleMatcher = stylePattern.matcher(result); while (styleMatcher.find()) { styleBlocks.add(styleMatcher.group(0)); } result = styleMatcher.replaceAll(tempStyleBlock); // process pure html result = processHtml(result); // process preserved blocks result = processPreBlocks(result, preBlocks); result = processTextareaBlocks(result, taBlocks); result = processScriptBlocks(result, scriptBlocks); result = processStyleBlocks(result, styleBlocks); result = processJspBlocks(result, jspBlocks); preBlocks = taBlocks = scriptBlocks = styleBlocks = jspBlocks = null; return result.trim(); } private static String processHtml(String html) { String result = html; // remove comments // if(removeComments) { result = commentPattern.matcher(result).replaceAll(""); // } // remove inter-tag spaces // if(removeIntertagSpaces) { result = itsPattern.matcher(result).replaceAll("><"); // } // remove multi whitespace characters // if(removeMultiSpaces) { result = result.replaceAll("\\s{2,}", " "); // } return result; } private static String processJspBlocks(String html, List<String> blocks) { String result = html; for (int i = 0; i < blocks.size(); i++) { blocks.set(i, compressJsp(blocks.get(i))); } // put preserved blocks back while (result.contains(tempJspBlock)) { result = result.replaceFirst(tempJspBlock, Matcher.quoteReplacement(blocks.remove(0))); } return result; } private static String processPreBlocks(String html, List<String> blocks) throws Exception { String result = html; // put preserved blocks back while (result.contains(tempPreBlock)) { result = result.replaceFirst(tempPreBlock, Matcher.quoteReplacement(blocks.remove(0))); } return result; } private static String processTextareaBlocks(String html, List<String> blocks) throws Exception { String result = html; // put preserved blocks back while (result.contains(tempTextAreaBlock)) { result = result.replaceFirst(tempTextAreaBlock, Matcher.quoteReplacement(blocks.remove(0))); } return result; } private static String processScriptBlocks(String html, List<String> blocks) throws Exception { String result = html; // if(compressJavaScript) { for (int i = 0; i < blocks.size(); i++) { blocks.set(i, compressJavaScript(blocks.get(i))); } // } // put preserved blocks back while (result.contains(tempScriptBlock)) { result = result.replaceFirst(tempScriptBlock, Matcher.quoteReplacement(blocks.remove(0))); } return result; } private static String processStyleBlocks(String html, List<String> blocks) throws Exception { String result = html; // if(compressCss) { for (int i = 0; i < blocks.size(); i++) { blocks.set(i, compressCssStyles(blocks.get(i))); } // } // put preserved blocks back while (result.contains(tempStyleBlock)) { result = result.replaceFirst(tempStyleBlock, Matcher.quoteReplacement(blocks.remove(0))); } return result; } private static String compressJsp(String source) { // check if block is not empty Matcher jspMatcher = jspPattern.matcher(source); if (jspMatcher.find()) { String result = compressJspJs(jspMatcher.group(1)); return (new StringBuilder(source.substring(0, jspMatcher.start(1))).append(result).append(source.substring(jspMatcher.end(1)))).toString(); } else { return source; } } private static String compressJavaScript(String source) { // check if block is not empty Matcher scriptMatcher = scriptPattern.matcher(source); if (scriptMatcher.find()) { String result = compressJspJs(scriptMatcher.group(1)); return (new StringBuilder(source.substring(0, scriptMatcher.start(1))).append(result).append(source.substring(scriptMatcher.end(1)))).toString(); } else { return source; } } private static String compressCssStyles(String source) { // check if block is not empty Matcher styleMatcher = stylePattern.matcher(source); if (styleMatcher.find()) { // 去掉注釋,換行 String result = multiCommentPattern.matcher(styleMatcher.group(1)).replaceAll(""); result = trimPattern.matcher(result).replaceAll(""); result = trimPattern2.matcher(result).replaceAll(""); return (new StringBuilder(source.substring(0, styleMatcher.start(1))).append(result).append(source.substring(styleMatcher.end(1)))).toString(); } else { return source; } } private static String compressJspJs(String source) { String result = source; // 因注釋符合有可能出現(xiàn)在字符串中,所以要先把字符串中的特殊符好去掉 Matcher stringMatcher = stringPattern.matcher(result); while (stringMatcher.find()) { String tmpStr = stringMatcher.group(0); if (tmpStr.indexOf("//") != -1 || tmpStr.indexOf("/*") != -1 || tmpStr.indexOf("*/") != -1) { String blockStr = tmpStr.replaceAll("//", tempSingleCommentBlock).replaceAll("/\\*", tempMulitCommentBlock1).replaceAll("\\*/", tempMulitCommentBlock2); result = result.replace(tmpStr, blockStr); } } // 去掉注釋 result = signleCommentPattern.matcher(result).replaceAll(""); result = multiCommentPattern.matcher(result).replaceAll(""); result = trimPattern2.matcher(result).replaceAll(""); result = trimPattern.matcher(result).replaceAll(" "); // 恢復替換掉的字符串 result = result.replaceAll(tempSingleCommentBlock, "//").replaceAll(tempMulitCommentBlock1, "/*").replaceAll(tempMulitCommentBlock2, "*/"); return result; } }
本文為張軍原創(chuàng)文章,轉(zhuǎn)載無需和我聯(lián)系,但請注明來自張軍的軍軍小站,個人博客http://m.eyofj.com
更多文章、技術(shù)交流、商務合作、聯(lián)系博主
微信掃碼或搜索:z360901061

微信掃一掃加我為好友
QQ號聯(lián)系: 360901061
您的支持是博主寫作最大的動力,如果您喜歡我的文章,感覺我的文章對您有幫助,請用微信掃描下面二維碼支持博主2元、5元、10元、20元等您想捐的金額吧,狠狠點擊下面給點支持吧,站長非常感激您!手機微信長按不能支付解決辦法:請將微信支付二維碼保存到相冊,切換到微信,然后點擊微信右上角掃一掃功能,選擇支付二維碼完成支付。
【本文對您有幫助就好】元
