Java：如何在Java中隐藏HTML字符实体？

基本上我想解码给定的Html文档，并replace所有的特殊字符，如"&nbsp" – > " " ， ">" – > ">" 。

在.NET中，我们可以使用HttpUtility.HtmlDecode 。

Java中的等效函数是什么？

Answer 1

我已经使用了Apache Commons StringEscapeUtils.unescapeHtml4（） ：

将包含实体的string转义为包含对应于转义字符的实际Unicode字符的string。 支持HTML 4.0实体。

Answer 2

我在我的项目中尝试了Apache Commons StringEscapeUtils.unescapeHtml3（），但对其性能不满意。 原来，它做了很多不必要的操作。 首先，它为每个调用分配一个StringWriter，即使在string中没有任何可以忽略的地方。 我已经重写了不同的代码，现在它运行速度更快。 谁在谷歌发现这个，欢迎使用它。

下面的代码可以忽略所有的HTML 3符号和数字转义（相当于Apache unescapeHtml3）。 如果您需要HTML 4，您可以将更多条目添加到地图中。

 package com.example; import java.io.StringWriter; import java.util.HashMap; public class StringUtils { public static final String unescapeHtml3(final String input) { StringWriter writer = null; int len = input.length(); int i = 1; int st = 0; while (true) { // look for '&' while (i < len && input.charAt(i-1) != '&') i++; if (i >= len) break; // found '&', look for ';' int j = i; while (j < len && j < i + MAX_ESCAPE + 1 && input.charAt(j) != ';') j++; if (j == len || j < i + MIN_ESCAPE || j == i + MAX_ESCAPE + 1) { i++; continue; } // found escape if (input.charAt(i) == '#') { // numeric escape int k = i + 1; int radix = 10; final char firstChar = input.charAt(k); if (firstChar == 'x' || firstChar == 'X') { k++; radix = 16; } try { int entityValue = Integer.parseInt(input.substring(k, j), radix); if (writer == null) writer = new StringWriter(input.length()); writer.append(input.substring(st, i - 1)); if (entityValue > 0xFFFF) { final char[] chrs = Character.toChars(entityValue); writer.write(chrs[0]); writer.write(chrs[1]); } else { writer.write(entityValue); } } catch (NumberFormatException ex) { i++; continue; } } else { // named escape CharSequence value = lookupMap.get(input.substring(i, j)); if (value == null) { i++; continue; } if (writer == null) writer = new StringWriter(input.length()); writer.append(input.substring(st, i - 1)); writer.append(value); } // skip escape st = j + 1; i = st; } if (writer != null) { writer.append(input.substring(st, len)); return writer.toString(); } return input; } private static final String[][] ESCAPES = { {"\"", "quot"}, // " - double-quote {"&", "amp"}, // & - ampersand {"<", "lt"}, // < - less-than {">", "gt"}, // > - greater-than // Mapping to escape ISO-8859-1 characters to their named HTML 3.x equivalents. {"\u00A0", "nbsp"}, // non-breaking space {"\u00A1", "iexcl"}, // inverted exclamation mark {"\u00A2", "cent"}, // cent sign {"\u00A3", "pound"}, // pound sign {"\u00A4", "curren"}, // currency sign {"\u00A5", "yen"}, // yen sign = yuan sign {"\u00A6", "brvbar"}, // broken bar = broken vertical bar {"\u00A7", "sect"}, // section sign {"\u00A8", "uml"}, // diaeresis = spacing diaeresis {"\u00A9", "copy"}, // © - copyright sign {"\u00AA", "ordf"}, // feminine ordinal indicator {"\u00AB", "laquo"}, // left-pointing double angle quotation mark = left pointing guillemet {"\u00AC", "not"}, // not sign {"\u00AD", "shy"}, // soft hyphen = discretionary hyphen {"\u00AE", "reg"}, // ® - registered trademark sign {"\u00AF", "macr"}, // macron = spacing macron = overline = APL overbar {"\u00B0", "deg"}, // degree sign {"\u00B1", "plusmn"}, // plus-minus sign = plus-or-minus sign {"\u00B2", "sup2"}, // superscript two = superscript digit two = squared {"\u00B3", "sup3"}, // superscript three = superscript digit three = cubed {"\u00B4", "acute"}, // acute accent = spacing acute {"\u00B5", "micro"}, // micro sign {"\u00B6", "para"}, // pilcrow sign = paragraph sign {"\u00B7", "middot"}, // middle dot = Georgian comma = Greek middle dot {"\u00B8", "cedil"}, // cedilla = spacing cedilla {"\u00B9", "sup1"}, // superscript one = superscript digit one {"\u00BA", "ordm"}, // masculine ordinal indicator {"\u00BB", "raquo"}, // right-pointing double angle quotation mark = right pointing guillemet {"\u00BC", "frac14"}, // vulgar fraction one quarter = fraction one quarter {"\u00BD", "frac12"}, // vulgar fraction one half = fraction one half {"\u00BE", "frac34"}, // vulgar fraction three quarters = fraction three quarters {"\u00BF", "iquest"}, // inverted question mark = turned question mark {"\u00C0", "Agrave"}, // А - uppercase A, grave accent {"\u00C1", "Aacute"}, // Б - uppercase A, acute accent {"\u00C2", "Acirc"}, // В - uppercase A, circumflex accent {"\u00C3", "Atilde"}, // Г - uppercase A, tilde {"\u00C4", "Auml"}, // Д - uppercase A, umlaut {"\u00C5", "Aring"}, // Е - uppercase A, ring {"\u00C6", "AElig"}, // Ж - uppercase AE {"\u00C7", "Ccedil"}, // З - uppercase C, cedilla {"\u00C8", "Egrave"}, // И - uppercase E, grave accent {"\u00C9", "Eacute"}, // Й - uppercase E, acute accent {"\u00CA", "Ecirc"}, // К - uppercase E, circumflex accent {"\u00CB", "Euml"}, // Л - uppercase E, umlaut {"\u00CC", "Igrave"}, // М - uppercase I, grave accent {"\u00CD", "Iacute"}, // Н - uppercase I, acute accent {"\u00CE", "Icirc"}, // О - uppercase I, circumflex accent {"\u00CF", "Iuml"}, // П - uppercase I, umlaut {"\u00D0", "ETH"}, // Р - uppercase Eth, Icelandic {"\u00D1", "Ntilde"}, // С - uppercase N, tilde {"\u00D2", "Ograve"}, // Т - uppercase O, grave accent {"\u00D3", "Oacute"}, // У - uppercase O, acute accent {"\u00D4", "Ocirc"}, // Ф - uppercase O, circumflex accent {"\u00D5", "Otilde"}, // Х - uppercase O, tilde {"\u00D6", "Ouml"}, // Ц - uppercase O, umlaut {"\u00D7", "times"}, // multiplication sign {"\u00D8", "Oslash"}, // Ш - uppercase O, slash {"\u00D9", "Ugrave"}, // Щ - uppercase U, grave accent {"\u00DA", "Uacute"}, // Ъ - uppercase U, acute accent {"\u00DB", "Ucirc"}, // Ы - uppercase U, circumflex accent {"\u00DC", "Uuml"}, // Ь - uppercase U, umlaut {"\u00DD", "Yacute"}, // Э - uppercase Y, acute accent {"\u00DE", "THORN"}, // Ю - uppercase THORN, Icelandic {"\u00DF", "szlig"}, // Я - lowercase sharps, German {"\u00E0", "agrave"}, // а - lowercase a, grave accent {"\u00E1", "aacute"}, // б - lowercase a, acute accent {"\u00E2", "acirc"}, // в - lowercase a, circumflex accent {"\u00E3", "atilde"}, // г - lowercase a, tilde {"\u00E4", "auml"}, // д - lowercase a, umlaut {"\u00E5", "aring"}, // е - lowercase a, ring {"\u00E6", "aelig"}, // ж - lowercase ae {"\u00E7", "ccedil"}, // з - lowercase c, cedilla {"\u00E8", "egrave"}, // и - lowercase e, grave accent {"\u00E9", "eacute"}, // й - lowercase e, acute accent {"\u00EA", "ecirc"}, // к - lowercase e, circumflex accent {"\u00EB", "euml"}, // л - lowercase e, umlaut {"\u00EC", "igrave"}, // м - lowercase i, grave accent {"\u00ED", "iacute"}, // н - lowercase i, acute accent {"\u00EE", "icirc"}, // о - lowercase i, circumflex accent {"\u00EF", "iuml"}, // п - lowercase i, umlaut {"\u00F0", "eth"}, // р - lowercase eth, Icelandic {"\u00F1", "ntilde"}, // с - lowercase n, tilde {"\u00F2", "ograve"}, // т - lowercase o, grave accent {"\u00F3", "oacute"}, // у - lowercase o, acute accent {"\u00F4", "ocirc"}, // ф - lowercase o, circumflex accent {"\u00F5", "otilde"}, // х - lowercase o, tilde {"\u00F6", "ouml"}, // ц - lowercase o, umlaut {"\u00F7", "divide"}, // division sign {"\u00F8", "oslash"}, // ш - lowercase o, slash {"\u00F9", "ugrave"}, // щ - lowercase u, grave accent {"\u00FA", "uacute"}, // ъ - lowercase u, acute accent {"\u00FB", "ucirc"}, // ы - lowercase u, circumflex accent {"\u00FC", "uuml"}, // ь - lowercase u, umlaut {"\u00FD", "yacute"}, // э - lowercase y, acute accent {"\u00FE", "thorn"}, // ю - lowercase thorn, Icelandic {"\u00FF", "yuml"}, // я - lowercase y, umlaut }; private static final int MIN_ESCAPE = 2; private static final int MAX_ESCAPE = 6; private static final HashMap<String, CharSequence> lookupMap; static { lookupMap = new HashMap<String, CharSequence>(); for (final CharSequence[] seq : ESCAPES) lookupMap.put(seq[1].toString(), seq[0]); } } 

Answer 3

在其他答案中提到的库将是很好的解决scheme，但是如果你已经碰巧在你的项目中挖掘真实世界的html， Jsoup项目比pipe理“和号英镑FFFF分号”的东西更多提供。

 // textValue: <p>This is a&nbsp;sample. \"Granny\" Smith &#8211;.<\/p>\r\n // becomes this: This is a sample. "Granny" Smith –. // with one line of code: // Jsoup.parse(textValue).getText(); // for older versions of Jsoup Jsoup.parse(textValue).text(); // Another possibility may be unescapeEntities(String string, boolean inAttribute); 

而且您还可以使用最好的DOM，CSS和类似jquery的方法来获取方便的数据提取和操作API。 它是开放源代码和MIT许可证。

Answer 4

以下库也可用于Java中的HTML转义： unbescape 。

HTML可以通过这种方式转义：

 final String unescapedText = HtmlEscape.unescapeHtml(escapedText); 

Answer 5

没有任何外部库的一个非常简单但低效的解决scheme是：

 public static String unescapeHtml3( String str ) { try { HTMLDocument doc = new HTMLDocument(); new HTMLEditorKit().read( new StringReader( "<html><body>" + str ), doc, 0 ); return doc.getText( 1, doc.getLength() ); } catch( Exception ex ) { return str; } } 

只有在你只有很less的string需要解码的情况下，这应该是有用的。

Answer 6

这为我做了这份工作，

 import org.apache.commons.lang.StringEscapeUtils; ... String decodedXML= StringEscapeUtils.unescapeHtml(encodedXML); 

希望这可以帮助 ：）

Answer 7

最可靠的方法是

 String cleanedString = StringEscapeUtils.unescapeHtml4(originalString); 

来自org.apache.commons.lang3.StringEscapeUtils 。

并逃避空白

 cleanedString = cleanedString.trim(); 

这将确保由于在Web表单中复制和粘贴而导致的空白不会保留在数据库中。

Answer 8

考虑使用HtmlManipulator Java类。 您可能需要添加一些项目（并非所有实体都在列表中）。

Kevin Hakansonbuild议的Apache Commons StringEscapeUtils没有为我工作， 像＃145（左边的单引号）这样的几个实体不知何故被翻译成了“222”。 我也尝试了org.jsoup，并有同样的问题。

Answer 9

在我的情况下，我使用replace方法通过testing每个variables中的每个实体，我的代码如下所示：

 text = text.replace("Ç", "Ç"); text = text.replace("ç", "ç"); text = text.replace("Á", "Á"); text = text.replace("Â", "Â"); text = text.replace("Ã", "Ã"); text = text.replace("É", "É"); text = text.replace("Ê", "Ê"); text = text.replace("Í", "Í"); text = text.replace("Ô", "Ô"); text = text.replace("Õ", "Õ"); text = text.replace("Ó", "Ó"); text = text.replace("Ú", "Ú"); text = text.replace("á", "á"); text = text.replace("â", "â"); text = text.replace("ã", "ã"); text = text.replace("é", "é"); text = text.replace("ê", "ê"); text = text.replace("í", "í"); text = text.replace("ô", "ô"); text = text.replace("õ", "õ"); text = text.replace("ó", "ó"); text = text.replace("ú", "ú"); 

在我的情况下，这工作得很好。

Answer 10

Incase你想模仿什么PHP函数htmlspecialchars_decode使用PHP函数get_html_translation_table（）来转储表，然后使用java代码，

 static Map<String,String> html_specialchars_table = new Hashtable<String,String>(); static { html_specialchars_table.put("&lt;","<"); html_specialchars_table.put("&gt;",">"); html_specialchars_table.put("&amp;","&"); } static String htmlspecialchars_decode_ENT_NOQUOTES(String s){ Enumeration en = html_specialchars_table.keys(); while(en.hasMoreElements()){ String key = en.nextElement(); String val = html_specialchars_table.get(key); s = s.replaceAll(key, val); } return s; }