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This article mainly explains "html escape characters and then code recognition", the content of the explanation is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "html escape characters and then code recognition" bar!

Occasionally see characters such as & # 39; in the data, with the following characteristics

Begins with & # and ends with a string of numbers ending with;

Begins with & and ends with a string of characters that ends with

Such as the most common or equivalent

When the browser encounters these escape characters, it will escape back, but how can it be identified by the code? Org.apache.commons.lang.StringEscapeUtils.unescapeHtml provides a good explanation.

In the first case above, the number is in the middle, and the number (unicode) is converted directly into char.

In the second case, there are characters in the middle, so we can only look up the mapping table. Find the number corresponding to the characters in the mapping table and convert it to char. Look at the code at a glance.

See how HTML40 defines it.

Static {

HTML40=newEntities ()

FillWithHtml40Entities (HTML40)

}

StaticvoidfillWithHtml40Entities (Entitiesentities) {

Entities.addEntities (BASIC_ARRAY)

Entities.addEntities (ISO8859_1_ARRAY)

Entities.addEntities (HTML40_ARRAY)

}

Let's see what BASIC_ARRAY, ISO8859_1_ARRAY and HTML40_ARRAY are, respectively.

BASIC_ARRAY

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

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

{"lt", "60"}, / /-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"}, / / reg-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"}, / / Aacute-uppercaseA,acuteaccent

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

{"Atilde", "195"}, / / Atilde-uppercaseA,tilde

{"Auml", "196"}, / / uppercaseA,umlaut

{"Aring", "197"}, / / Aring-uppercaseA,ring

{"AElig", "198"}, / / uppercaseAE

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

{"Egrave", "200"}, / / Egrave-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"}, / / Ouml-uppercaseO,umlaut

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

{"Oslash", "216"}, / / Oslash-uppercaseO,slash

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

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

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

{"Uuml", "220"}, / / uppercaseU,umlaut

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

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

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

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

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

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

{"atilde", "227"}, / / lowercasea,tilde

{"auml", "228"}, / / lowercasea,umlaut

{"aring", "229"}, / / lowercasea,ring

{"aelig", "230"}, / / lowercaseae

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

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

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

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

{"euml", "235"}, / / euml-lowercasee,umlaut

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

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

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

{"iuml", "239"}, / / lowercasei,umlaut

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

{"ntilde", "241"}, / / ntilde-lowercasen,tilde

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

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

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

{"otilde", "245"}, / / otilde-lowercaseo,tilde

{"ouml", "246"}, / / ouml-lowercaseo,umlaut

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

{"oslash", "248"}, / / oslash-lowercaseo,slash

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

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

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

{"uuml", "252"}, / / uuml-lowercaseu,umlaut

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

{"thorn", "254"}, / / thorn-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"}, / / 220FISOamsbyl->

/ /

{"sum", "8721"}, / / copyright 2211 ISOamsb->

/ /

{"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-- >

/ /

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