html的转义字符然后通过代码识别

这篇文章主要讲解了“html的转义字符然后通过代码识别”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“html的转义字符然后通过代码识别”吧！

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偶尔会在数据中看到诸如'这样的字符，特征如下

以&#开头，中间是一串数字，以；结尾

以&开头，中间一串字符，以；结尾

比如最常见的 或者等价的 

浏览器遇到这些转义符，会转义回来，但如何通过代码识别？org.apache.commons.lang.StringEscapeUtils.unescapeHtml提供了很好的说明

遇到上面的第一种情况，中间是数字的，直接将数字（unicode）转为char

遇到第二情况，中间是字符，只能查映射表了,从映射表中找到字符对应的数字再转换为char看看代码就一目了然了

看看HTML40如何定义的

static{

HTML40=newEntities();

fillWithHtml40Entities(HTML40);

}

staticvoidfillWithHtml40Entities(Entitiesentities){

entities.addEntities(BASIC_ARRAY);

entities.addEntities(ISO8859_1_ARRAY);

entities.addEntities(HTML40_ARRAY);

}

再看看BASIC_ARRAY、ISO8859_1_ARRAY、HTML40_ARRAY分别是什么

BASIC_ARRAY

privatestaticfinalString[][]BASIC_ARRAY={{"quot","34"},//"-double-quote

{"amp","38"},//&-ampersand

{"lt","60"},//<-less-than

{"gt","62"},//>-greater-than

};

ISO8859_1_ARRAY

staticfinalString[][]ISO8859_1_ARRAY={{"nbsp","160"},//non-breakingspace

{"iexcl","161"},//invertedexclamationmark

{"cent","162"},//centsign

{"pound","163"},//poundsign

{"curren","164"},//currencysign

{"yen","165"},//yensign=yuansign

{"brvbar","166"},//brokenbar=brokenverticalbar

{"sect","167"},//sectionsign

{"uml","168"},//diaeresis=spacingdiaeresis

{"copy","169"},//�-copyrightsign

{"ordf","170"},//feminineordinalindicator

{"laquo","171"},//left-pointingdoubleanglequotationmark=leftpointingguillemet

{"not","172"},//notsign

{"shy","173"},//softhyphen=discretionaryhyphen

{"reg","174"},//�-registeredtrademarksign

{"macr","175"},//macron=spacingmacron=overline=APLoverbar

{"deg","176"},//degreesign

{"plusmn","177"},//plus-minussign=plus-or-minussign

{"sup2","178"},//superscripttwo=superscriptdigittwo=squared

{"sup3","179"},//superscriptthree=superscriptdigitthree=cubed

{"acute","180"},//acuteaccent=spacingacute

{"micro","181"},//microsign

{"para","182"},//pilcrowsign=paragraphsign

{"middot","183"},//middledot=Georgiancomma=Greekmiddledot

{"cedil","184"},//cedilla=spacingcedilla

{"sup1","185"},//superscriptone=superscriptdigitone

{"ordm","186"},//masculineordinalindicator

{"raquo","187"},//right-pointingdoubleanglequotationmark=rightpointingguillemet

{"frac14","188"},//vulgarfractiononequarter=fractiononequarter

{"frac12","189"},//vulgarfractiononehalf=fractiononehalf

{"frac34","190"},//vulgarfractionthreequarters=fractionthreequarters

{"iquest","191"},//invertedquestionmark=turnedquestionmark

{"Agrave","192"},//�-uppercaseA,graveaccent

{"Aacute","193"},//�-uppercaseA,acuteaccent

{"Acirc","194"},//�-uppercaseA,circumflexaccent

{"Atilde","195"},//�-uppercaseA,tilde

{"Auml","196"},//�-uppercaseA,umlaut

{"Aring","197"},//�-uppercaseA,ring

{"AElig","198"},//�-uppercaseAE

{"Ccedil","199"},//�-uppercaseC,cedilla

{"Egrave","200"},//�-uppercaseE,graveaccent

{"Eacute","201"},//�-uppercaseE,acuteaccent

{"Ecirc","202"},//�-uppercaseE,circumflexaccent

{"Euml","203"},//�-uppercaseE,umlaut

{"Igrave","204"},//�-uppercaseI,graveaccent

{"Iacute","205"},//�-uppercaseI,acuteaccent

{"Icirc","206"},//�-uppercaseI,circumflexaccent

{"Iuml","207"},//�-uppercaseI,umlaut

{"ETH","208"},//�-uppercaseEth,Icelandic

{"Ntilde","209"},//�-uppercaseN,tilde

{"Ograve","210"},//�-uppercaseO,graveaccent

{"Oacute","211"},//�-uppercaseO,acuteaccent

{"Ocirc","212"},//�-uppercaseO,circumflexaccent

{"Otilde","213"},//�-uppercaseO,tilde

{"Ouml","214"},//�-uppercaseO,umlaut

{"times","215"},//multiplicationsign

{"Oslash","216"},//�-uppercaseO,slash

{"Ugrave","217"},//�-uppercaseU,graveaccent

{"Uacute","218"},//�-uppercaseU,acuteaccent

{"Ucirc","219"},//�-uppercaseU,circumflexaccent

{"Uuml","220"},//�-uppercaseU,umlaut

{"Yacute","221"},//�-uppercaseY,acuteaccent

{"THORN","222"},//�-uppercaseTHORN,Icelandic

{"szlig","223"},//�-lowercasesharps,German

{"agrave","224"},//�-lowercasea,graveaccent

{"aacute","225"},//�-lowercasea,acuteaccent

{"acirc","226"},//�-lowercasea,circumflexaccent

{"atilde","227"},//�-lowercasea,tilde

{"auml","228"},//�-lowercasea,umlaut

{"aring","229"},//�-lowercasea,ring

{"aelig","230"},//�-lowercaseae

{"ccedil","231"},//�-lowercasec,cedilla

{"egrave","232"},//�-lowercasee,graveaccent

{"eacute","233"},//�-lowercasee,acuteaccent

{"ecirc","234"},//�-lowercasee,circumflexaccent

{"euml","235"},//�-lowercasee,umlaut

{"igrave","236"},//�-lowercasei,graveaccent

{"iacute","237"},//�-lowercasei,acuteaccent

{"icirc","238"},//�-lowercasei,circumflexaccent

{"iuml","239"},//�-lowercasei,umlaut

{"eth","240"},//�-lowercaseeth,Icelandic

{"ntilde","241"},//�-lowercasen,tilde

{"ograve","242"},//�-lowercaseo,graveaccent

{"oacute","243"},//�-lowercaseo,acuteaccent

{"ocirc","244"},//�-lowercaseo,circumflexaccent

{"otilde","245"},//�-lowercaseo,tilde

{"ouml","246"},//�-lowercaseo,umlaut

{"divide","247"},//divisionsign

{"oslash","248"},//�-lowercaseo,slash

{"ugrave","249"},//�-lowercaseu,graveaccent

{"uacute","250"},//�-lowercaseu,acuteaccent

{"ucirc","251"},//�-lowercaseu,circumflexaccent

{"uuml","252"},//�-lowercaseu,umlaut

{"yacute","253"},//�-lowercasey,acuteaccent

{"thorn","254"},//�-lowercasethorn,Icelandic

{"yuml","255"},//�-lowercasey,umlaut

};

HTML40_ARRAY

staticfinalString[][]HTML40_ARRAY={

//

{"fnof","402"},//latinsmallfwithhook=function=florin,U+0192ISOtech-->

//

{"Alpha","913"},//greekcapitalletteralpha,U+0391-->

{"Beta","914"},//greekcapitalletterbeta,U+0392-->

{"Gamma","915"},//greekcapitallettergamma,U+0393ISOgrk3-->

{"Delta","916"},//greekcapitalletterdelta,U+0394ISOgrk3-->

{"Epsilon","917"},//greekcapitalletterepsilon,U+0395-->

{"Zeta","918"},//greekcapitalletterzeta,U+0396-->

{"Eta","919"},//greekcapitallettereta,U+0397-->

{"Theta","920"},//greekcapitallettertheta,U+0398ISOgrk3-->

{"Iota","921"},//greekcapitalletteriota,U+0399-->

{"Kappa","922"},//greekcapitalletterkappa,U+039A-->

{"Lambda","923"},//greekcapitalletterlambda,U+039BISOgrk3-->

{"Mu","924"},//greekcapitallettermu,U+039C-->

{"Nu","925"},//greekcapitalletternu,U+039D-->

{"Xi","926"},//greekcapitalletterxi,U+039EISOgrk3-->

{"Omicron","927"},//greekcapitalletteromicron,U+039F-->

{"Pi","928"},//greekcapitalletterpi,U+03A0ISOgrk3-->

{"Rho","929"},//greekcapitalletterrho,U+03A1-->

//

{"Sigma","931"},//greekcapitallettersigma,U+03A3ISOgrk3-->

{"Tau","932"},//greekcapitallettertau,U+03A4-->

{"Upsilon","933"},//greekcapitalletterupsilon,U+03A5ISOgrk3-->

{"Phi","934"},//greekcapitalletterphi,U+03A6ISOgrk3-->

{"Chi","935"},//greekcapitalletterchi,U+03A7-->

{"Psi","936"},//greekcapitalletterpsi,U+03A8ISOgrk3-->

{"Omega","937"},//greekcapitalletteromega,U+03A9ISOgrk3-->

{"alpha","945"},//greeksmallletteralpha,U+03B1ISOgrk3-->

{"beta","946"},//greeksmallletterbeta,U+03B2ISOgrk3-->

{"gamma","947"},//greeksmalllettergamma,U+03B3ISOgrk3-->

{"delta","948"},//greeksmallletterdelta,U+03B4ISOgrk3-->

{"epsilon","949"},//greeksmallletterepsilon,U+03B5ISOgrk3-->

{"zeta","950"},//greeksmallletterzeta,U+03B6ISOgrk3-->

{"eta","951"},//greeksmalllettereta,U+03B7ISOgrk3-->

{"theta","952"},//greeksmalllettertheta,U+03B8ISOgrk3-->

{"iota","953"},//greeksmallletteriota,U+03B9ISOgrk3-->

{"kappa","954"},//greeksmallletterkappa,U+03BAISOgrk3-->

{"lambda","955"},//greeksmallletterlambda,U+03BBISOgrk3-->

{"mu","956"},//greeksmalllettermu,U+03BCISOgrk3-->

{"nu","957"},//greeksmallletternu,U+03BDISOgrk3-->

{"xi","958"},//greeksmallletterxi,U+03BEISOgrk3-->

{"omicron","959"},//greeksmallletteromicron,U+03BFNEW-->

{"pi","960"},//greeksmallletterpi,U+03C0ISOgrk3-->

{"rho","961"},//greeksmallletterrho,U+03C1ISOgrk3-->

{"sigmaf","962"},//greeksmallletterfinalsigma,U+03C2ISOgrk3-->

{"sigma","963"},//greeksmalllettersigma,U+03C3ISOgrk3-->

{"tau","964"},//greeksmalllettertau,U+03C4ISOgrk3-->

{"upsilon","965"},//greeksmallletterupsilon,U+03C5ISOgrk3-->

{"phi","966"},//greeksmallletterphi,U+03C6ISOgrk3-->

{"chi","967"},//greeksmallletterchi,U+03C7ISOgrk3-->

{"psi","968"},//greeksmallletterpsi,U+03C8ISOgrk3-->

{"omega","969"},//greeksmallletteromega,U+03C9ISOgrk3-->

{"thetasym","977"},//greeksmallletterthetasymbol,U+03D1NEW-->

{"upsih","978"},//greekupsilonwithhooksymbol,U+03D2NEW-->

{"piv","982"},//greekpisymbol,U+03D6ISOgrk3-->

//

{"bull","8226"},//bullet=blacksmallcircle,U+2022ISOpub-->

//

{"hellip","8230"},//horizontalellipsis=threedotleader,U+2026ISOpub-->

{"prime","8242"},//prime=minutes=feet,U+2032ISOtech-->

{"Prime","8243"},//doubleprime=seconds=inches,U+2033ISOtech-->

{"oline","8254"},//overline=spacingoverscore,U+203ENEW-->

{"frasl","8260"},//fractionslash,U+2044NEW-->

//

{"weierp","8472"},//scriptcapitalP=powerset=Weierstrassp,U+2118ISOamso-->

{"image","8465"},//blacklettercapitalI=imaginarypart,U+2111ISOamso-->

{"real","8476"},//blacklettercapitalR=realpartsymbol,U+211CISOamso-->

{"trade","8482"},//trademarksign,U+2122ISOnum-->

{"alefsym","8501"},//alefsymbol=firsttransfinitecardinal,U+2135NEW-->

//

//

{"larr","8592"},//leftwardsarrow,U+2190ISOnum-->

{"uarr","8593"},//upwardsarrow,U+2191ISOnum-->

{"rarr","8594"},//rightwardsarrow,U+2192ISOnum-->

{"darr","8595"},//downwardsarrow,U+2193ISOnum-->

{"harr","8596"},//leftrightarrow,U+2194ISOamsa-->

{"crarr","8629"},//downwardsarrowwithcornerleftwards=carriagereturn,U+21B5NEW-->

{"lArr","8656"},//leftwardsdoublearrow,U+21D0ISOtech-->

//

{"uArr","8657"},//upwardsdoublearrow,U+21D1ISOamsa-->

{"rArr","8658"},//rightwardsdoublearrow,U+21D2ISOtech-->

//

{"dArr","8659"},//downwardsdoublearrow,U+21D3ISOamsa-->

{"hArr","8660"},//leftrightdoublearrow,U+21D4ISOamsa-->

//

{"forall","8704"},//forall,U+2200ISOtech-->

{"part","8706"},//partialdifferential,U+2202ISOtech-->

{"exist","8707"},//thereexists,U+2203ISOtech-->

{"empty","8709"},//emptyset=nullset=diameter,U+2205ISOamso-->

{"nabla","8711"},//nabla=backwarddifference,U+2207ISOtech-->

{"isin","8712"},//elementof,U+2208ISOtech-->

{"notin","8713"},//notanelementof,U+2209ISOtech-->

{"ni","8715"},//containsasmember,U+220BISOtech-->

//

{"prod","8719"},//n-aryproduct=productsign,U+220FISOamsb-->

//

{"sum","8721"},//n-arysummation,U+2211ISOamsb-->

//

{"minus","8722"},//minussign,U+2212ISOtech-->

{"lowast","8727"},//asteriskoperator,U+2217ISOtech-->

{"radic","8730"},//squareroot=radicalsign,U+221AISOtech-->

{"prop","8733"},//proportionalto,U+221DISOtech-->

{"infin","8734"},//infinity,U+221EISOtech-->

{"ang","8736"},//angle,U+2220ISOamso-->

{"and","8743"},//logicaland=wedge,U+2227ISOtech-->

{"or","8744"},//logicalor=vee,U+2228ISOtech-->

{"cap","8745"},//intersection=cap,U+2229ISOtech-->

{"cup","8746"},//union=cup,U+222AISOtech-->

{"int","8747"},//integral,U+222BISOtech-->

{"there4","8756"},//therefore,U+2234ISOtech-->

{"sim","8764"},//tildeoperator=varieswith=similarto,U+223CISOtech-->

//

{"cong","8773"},//approximatelyequalto,U+2245ISOtech-->

{"asymp","8776"},//almostequalto=asymptoticto,U+2248ISOamsr-->

{"ne","8800"},//notequalto,U+2260ISOtech-->

{"equiv","8801"},//identicalto,U+2261ISOtech-->

{"le","8804"},//less-thanorequalto,U+2264ISOtech-->

{"ge","8805"},//greater-thanorequalto,U+2265ISOtech-->

{"sub","8834"},//subsetof,U+2282ISOtech-->

{"sup","8835"},//supersetof,U+2283ISOtech-->

//

//notasubsetof,U+2284ISOamsn-->

{"sube","8838"},//subsetoforequalto,U+2286ISOtech-->

{"supe","8839"},//supersetoforequalto,U+2287ISOtech-->

{"oplus","8853"},//circledplus=directsum,U+2295ISOamsb-->

{"otimes","8855"},//circledtimes=vectorproduct,U+2297ISOamsb-->

{"perp","8869"},//uptack=orthogonalto=perpendicular,U+22A5ISOtech-->

{"sdot","8901"},//dotoperator,U+22C5ISOamsb-->

//

//

{"lceil","8968"},//leftceiling=aplupstile,U+2308ISOamsc-->

{"rceil","8969"},//rightceiling,U+2309ISOamsc-->

{"lfloor","8970"},//leftfloor=apldownstile,U+230AISOamsc-->

{"rfloor","8971"},//rightfloor,U+230BISOamsc-->

{"lang","9001"},//left-pointinganglebracket=bra,U+2329ISOtech-->

//

{"rang","9002"},//right-pointinganglebracket=ket,U+232AISOtech-->

//

//

{"loz","9674"},//lozenge,U+25CAISOpub-->

//

{"spades","9824"},//blackspadesuit,U+2660ISOpub-->

//

{"clubs","9827"},//blackclubsuit=shamrock,U+2663ISOpub-->

{"hearts","9829"},//blackheartsuit=valentine,U+2665ISOpub-->

{"diams","9830"},//blackdiamondsuit,U+2666ISOpub-->

//

{"OElig","338"},//--latincapitalligatureOE,U+0152ISOlat2-->

{"oelig","339"},//--latinsmallligatureoe,U+0153ISOlat2-->

//

{"Scaron","352"},//--latincapitalletterSwithcaron,U+0160ISOlat2-->

{"scaron","353"},//--latinsmallletterswithcaron,U+0161ISOlat2-->

{"Yuml","376"},//--latincapitalletterYwithdiaeresis,U+0178ISOlat2-->

//

{"circ","710"},//--modifierlettercircumflexaccent,U+02C6ISOpub-->

{"tilde","732"},//smalltilde,U+02DCISOdia-->

//

{"ensp","8194"},//enspace,U+2002ISOpub-->

{"emsp","8195"},//emspace,U+2003ISOpub-->

{"thinsp","8201"},//thinspace,U+2009ISOpub-->

{"zwnj","8204"},//zerowidthnon-joiner,U+200CNEWRFC2070-->

{"zwj","8205"},//zerowidthjoiner,U+200DNEWRFC2070-->

{"lrm","8206"},//left-to-rightmark,U+200ENEWRFC2070-->

{"rlm","8207"},//right-to-leftmark,U+200FNEWRFC2070-->

{"ndash","8211"},//endash,U+2013ISOpub-->

{"mdash","8212"},//emdash,U+2014ISOpub-->

{"lsquo","8216"},//leftsinglequotationmark,U+2018ISOnum-->

{"rsquo","8217"},//rightsinglequotationmark,U+2019ISOnum-->

{"sbquo","8218"},//singlelow-9quotationmark,U+201ANEW-->

{"ldquo","8220"},//leftdoublequotationmark,U+201CISOnum-->

{"rdquo","8221"},//rightdoublequotationmark,U+201DISOnum-->

{"bdquo","8222"},//doublelow-9quotationmark,U+201ENEW-->

{"dagger","8224"},//dagger,U+2020ISOpub-->

{"Dagger","8225"},//doubledagger,U+2021ISOpub-->

{"permil","8240"},//permillesign,U+2030ISOtech-->

{"lsaquo","8249"},//singleleft-pointinganglequotationmark,U+2039ISOproposed-->

//

{"rsaquo","8250"},//singleright-pointinganglequotationmark,U+203AISOproposed-->

//

{"euro","8364"},//--eurosign,U+20ACNEW-->

};

感谢各位的阅读，以上就是“html的转义字符然后通过代码识别”的内容了，经过本文的学习后，相信大家对html的转义字符然后通过代码识别这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！