涓轰粈涔堣缂栫爜
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濡備綍鈥滅炕璇戔��
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ASCII 鐮�
瀛﹁繃璁＄畻鏈虹殑浜洪兘鐭ラ亾 ASCII 鐮侊紝鎬诲叡鏈� 128 涓紝鐢ㄤ竴涓瓧鑺傜殑浣� 7 浣嶈〃绀猴紝0~31 鏄帶鍒跺瓧绗﹀鎹㈣鍥炶溅鍒犻櫎绛夛紱32~126 鏄墦鍗板瓧绗︼紝鍙互閫氳繃閿洏杈撳叆骞朵笖鑳藉鏄剧ず鍑烘潵銆�
ISO-8859-1
128 涓瓧绗︽樉鐒舵槸涓嶅鐢ㄧ殑锛屼簬鏄� ISO 缁勭粐鍦� ASCII 鐮佸熀纭�涓婂張鍒跺畾浜嗕竴浜涘垪鏍囧噯鐢ㄦ潵鎵╁睍 ASCII 缂栫爜锛屽畠浠槸 ISO-8859-1~ISO-8859-15锛屽叾涓� ISO-8859-1 娑电洊浜嗗ぇ澶氭暟瑗挎璇█瀛楃锛屾墍鏈夊簲鐢ㄧ殑鏈�骞挎硾銆侷SO-8859-1 浠嶇劧鏄崟瀛楄妭缂栫爜锛屽畠鎬诲叡鑳借〃绀� 256 涓瓧绗︺��
GB2312
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GBK
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GB18030
鍏ㄧО鏄�婁俊鎭氦鎹㈢敤姹夊瓧缂栫爜瀛楃闆嗐�嬶紝鏄垜鍥界殑寮哄埗鏍囧噯锛屽畠鍙兘鏄崟瀛楄妭銆佸弻瀛楄妭鎴栬�呭洓瀛楄妭缂栫爜锛屽畠鐨勭紪鐮佷笌 GB2312 缂栫爜鍏煎锛岃繖涓櫧鐒舵槸鍥藉鏍囧噯锛屼絾鏄疄闄呭簲鐢ㄧ郴缁熶腑浣跨敤鐨勫苟涓嶅箍娉涖��
UTF-16
璇村埌 UTF 蹇呴』瑕佹彁鍒� Unicode锛圲niversal Code 缁熶竴鐮侊級锛孖SO 璇曞浘鎯冲垱寤轰竴涓叏鏂扮殑瓒呰瑷�瀛楀吀锛屼笘鐣屼笂鎵�鏈夌殑璇█閮藉彲浠ラ�氳繃杩欐湰瀛楀吀鏉ョ浉浜掔炕璇戙�傚彲鎯宠�岀煡杩欎釜瀛楀吀鏄涔堢殑澶嶆潅锛屽叧浜� Unicode 鐨勮缁嗚鑼冨彲浠ュ弬鑰冪浉搴旀枃妗ｃ�俇nicode 鏄� Java 鍜� XML 鐨勫熀纭�锛屼笅闈㈣缁嗕粙缁� Unicode 鍦ㄨ绠楁満涓殑瀛樺偍褰㈠紡銆�
UTF-16 鍏蜂綋瀹氫箟浜� Unicode 瀛楃鍦ㄨ绠楁満涓瓨鍙栨柟娉曘�俇TF-16 鐢ㄤ袱涓瓧鑺傛潵琛ㄧず Unicode 杞寲鏍煎紡锛岃繖涓槸瀹氶暱鐨勮〃绀烘柟娉曪紝涓嶈浠�涔堝瓧绗﹂兘鍙互鐢ㄤ袱涓瓧鑺傝〃绀猴紝涓や釜瀛楄妭鏄� 16 涓� bit锛屾墍浠ュ彨 UTF-16銆俇TF-16 琛ㄧず瀛楃闈炲父鏂逛究锛屾瘡涓や釜瀛楄妭琛ㄧず涓�涓瓧绗︼紝杩欎釜鍦ㄥ瓧绗︿覆鎿嶄綔鏃跺氨澶уぇ绠�鍖栦簡鎿嶄綔锛岃繖涔熸槸
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UTF-8
UTF-16 缁熶竴閲囩敤涓や釜瀛楄妭琛ㄧず涓�涓瓧绗︼紝铏界劧鍦ㄨ〃绀轰笂闈炲父绠�鍗曟柟渚匡紝浣嗘槸涔熸湁鍏剁己鐐癸紝鏈夊緢澶т竴閮ㄥ垎瀛楃鐢ㄤ竴涓瓧鑺傚氨 鍙互琛ㄧず鐨勭幇鍦ㄨ涓や釜瀛楄妭琛ㄧず锛屽瓨鍌ㄧ┖闂存斁澶т簡涓�鍊嶏紝鍦ㄧ幇鍦ㄧ殑缃戠粶甯﹀杩橀潪甯告湁闄愮殑浠婂ぉ锛岃繖鏍蜂細澧炲ぇ缃戠粶浼犺緭鐨勬祦閲忥紝鑰屼笖涔熸病蹇呰銆傝��
UTF-8 閲囩敤浜嗕竴绉嶅彉闀挎妧鏈紝姣忎釜缂栫爜鍖哄煙鏈変笉鍚岀殑瀛楃爜闀垮害銆備笉鍚岀被鍨嬬殑瀛楃鍙互鏄敱 1~6 涓瓧鑺傜粍鎴�
銆�
UTF-8 鏈変互涓嬬紪鐮佽鍒欙細
濡傛灉涓�涓瓧鑺傦紝鏈�楂樹綅锛堢 8 浣嶏級涓� 0锛岃〃绀鸿繖鏄竴涓� ASCII 瀛楃锛�00 - 7F锛夈�傚彲瑙侊紝鎵�鏈� ASCII 缂栫爜宸茬粡鏄� UTF-8 浜嗐��
濡傛灉涓�涓瓧鑺傦紝浠� 11 寮�澶达紝杩炵画鐨� 1 鐨勪釜鏁版殫绀鸿繖涓瓧绗︾殑瀛楄妭鏁帮紝渚嬪锛�110xxxxx 浠ｈ〃瀹冩槸鍙屽瓧鑺� UTF-8 瀛楃鐨勯瀛楄妭銆�
濡傛灉涓�涓瓧鑺傦紝浠� 10 寮�濮嬶紝琛ㄧず瀹冧笉鏄瀛楄妭锛岄渶瑕佸悜鍓嶆煡鎵炬墠鑳藉緱鍒板綋鍓嶅瓧绗︾殑棣栧瓧鑺�
Java 涓渶瑕佺紪鐮佺殑鍦烘櫙
鍓嶉潰鎻忚堪浜嗗父瑙佺殑鍑犵缂栫爜鏍煎紡锛屼笅闈㈠皢浠嬬粛 Java 涓浣曞鐞嗗缂栫爜鐨勬敮鎸侊紝浠�涔堝満鍚堜腑闇�瑕佺紪鐮併��
I/O 鎿嶄綔涓瓨鍦ㄧ殑缂栫爜
鎴戜滑鐭ラ亾娑夊強鍒扮紪鐮佺殑鍦版柟涓�鑸兘鍦ㄥ瓧绗﹀埌瀛楄妭鎴栬�呭瓧鑺傚埌瀛楃鐨勮浆鎹笂锛岃�岄渶瑕佽繖绉嶈浆鎹㈢殑鍦烘櫙涓昏鏄湪 I/O 鐨勬椂鍊欙紝杩欎釜 I/O 鍖呮嫭纾佺洏 I/O 鍜岀綉缁� I/O锛屽叧浜庣綉缁� I/O 閮ㄥ垎鍦ㄥ悗闈㈠皢涓昏浠� Web 搴旂敤涓轰緥浠嬬粛銆備笅鍥炬槸 Java 涓鐞� I/O 闂鐨勬帴鍙ｏ細
Reader 绫绘槸 Java 鐨� I/O 涓瀛楃鐨勭埗绫伙紝鑰� InputStream 绫绘槸璇诲瓧鑺傜殑鐖剁被锛孖nputStreamReader 绫诲氨鏄叧鑱斿瓧鑺傚埌瀛楃鐨勬ˉ姊侊紝瀹冭礋璐ｅ湪 I/O 杩囩▼涓鐞嗚鍙栧瓧鑺傚埌瀛楃鐨勮浆鎹紝鑰屽叿浣撳瓧鑺傚埌瀛楃鐨勮В鐮佸疄鐜板畠鐢� StreamDecoder 鍘诲疄鐜帮紝鍦� StreamDecoder 瑙ｇ爜杩囩▼涓繀椤荤敱鐢ㄦ埛鎸囧畾 Charset 缂栫爜鏍煎紡銆傚�煎緱娉ㄦ剰鐨勬槸濡傛灉浣犳病鏈夋寚瀹� Charset锛屽皢浣跨敤鏈湴鐜涓殑榛樿瀛楃闆嗭紝渚嬪鍦ㄤ腑鏂囩幆澧冧腑灏嗕娇鐢� GBK 缂栫爜銆�
鍐欑殑鎯呭喌涔熸槸绫讳技锛屽瓧绗︾殑鐖剁被鏄� Writer锛屽瓧鑺傜殑鐖剁被鏄� OutputStream锛岄�氳繃 OutputStreamWriter 杞崲瀛楃鍒板瓧鑺傘�傚涓嬪浘鎵�绀猴細
鍚屾牱 StreamEncoder 绫昏礋璐ｅ皢瀛楃缂栫爜鎴愬瓧鑺傦紝缂栫爜鏍煎紡鍜岄粯璁ょ紪鐮佽鍒欎笌瑙ｇ爜鏄竴鑷寸殑銆�
濡備笅闈竴娈典唬鐮侊紝瀹炵幇浜嗘枃浠剁殑璇诲啓鍔熻兘锛�
Java浠ｇ爜
String聽file聽="c:/stream.txt";
String聽charset聽="UTF-8";
//聽鍐欏瓧绗︽崲杞垚瀛楄妭娴�
FileOutputStream聽outputStream聽=new聽FileOutputStream(file);
OutputStreamWriter聽writer聽=new聽OutputStreamWriter(
outputStream,聽charset);
try聽{
writer.write("杩欐槸瑕佷繚瀛樼殑涓枃瀛楃");
}finally聽{
writer.close();
}
//聽璇诲彇瀛楄妭杞崲鎴愬瓧绗�
FileInputStream聽inputStream聽=new聽FileInputStream(file);
InputStreamReader聽reader聽=new聽InputStreamReader(
inputStream,聽charset);
StringBuffer聽buffer聽=new聽StringBuffer();
char[]聽buf聽=newchar[64];
int聽count聽=0;
try聽{
while聽((count聽=聽reader.read(buf))聽!=聽-1)聽{
buffer.append(buffer,0,聽count);
}
}finally聽{
reader.close();
}
鍦ㄦ垜浠殑搴旂敤绋嬪簭涓秹鍙婂埌 I/O 鎿嶄綔鏃跺彧瑕佹敞鎰忔寚瀹氱粺涓�鐨勭紪瑙ｇ爜 Charset 瀛楃闆嗭紝涓�鑸笉浼氬嚭鐜颁贡鐮侀棶棰橈紝鏈変簺搴旂敤绋嬪簭濡傛灉涓嶆敞鎰忔寚瀹氬瓧绗︾紪鐮侊紝涓枃鐜涓彇鎿嶄綔绯荤粺榛樿缂栫爜锛屽鏋滅紪瑙ｇ爜閮藉湪涓枃鐜涓紝閫氬父涔熸病闂锛屼絾鏄繕鏄己鐑堢殑涓嶅缓璁娇鐢ㄦ搷浣滅郴缁熺殑榛樿缂栫爜锛屽洜涓鸿繖鏍凤紝浣犵殑搴旂敤绋嬪簭鐨勭紪鐮佹牸寮忓氨鍜岃繍琛岀幆澧冪粦瀹氳捣鏉ヤ簡锛屽湪璺ㄧ幆澧冧笅寰堝彲鑳藉嚭鐜颁贡鐮侀棶棰樸��
鍐呭瓨涓搷浣滀腑鐨勭紪鐮�
鍦� Java 寮�鍙戜腑闄や簡 I/O 娑夊強鍒扮紪鐮佸锛屾渶甯哥敤鐨勫簲璇ュ氨鏄湪鍐呭瓨涓繘琛屽瓧绗﹀埌瀛楄妭鐨勬暟鎹被鍨嬬殑杞崲锛孞ava 涓敤 String 琛ㄧず瀛楃涓诧紝鎵�浠� String 绫诲氨鎻愪緵杞崲鍒板瓧鑺傜殑鏂规硶锛屼篃鏀寔灏嗗瓧鑺傝浆鎹负瀛楃涓茬殑鏋勯�犲嚱鏁般�傚涓嬩唬鐮佺ず渚嬶細
Java浠ｇ爜
String聽s聽="杩欐槸涓�娈典腑鏂囧瓧绗︿覆";
byte[]聽b聽=聽s.getBytes("UTF-8");
String聽n聽=new聽String(b,"UTF-8");
鍙﹀涓�涓槸宸茬粡琚搴熷純鐨� ByteToCharConverter 鍜� CharToByteConverter 绫伙紝瀹冧滑鍒嗗埆鎻愪緵浜� convertAll 鏂规硶鍙互瀹炵幇 byte[] 鍜� char[] 鐨勪簰杞�傚涓嬩唬鐮佹墍绀猴細
Java浠ｇ爜
ByteToCharConverter聽charConverter聽=聽ByteToCharConverter.getConverter("UTF-8");
char聽c[]聽=聽charConverter.convertAll(byteArray);
CharToByteConverter聽byteConverter聽=聽CharToByteConverter.getConverter("UTF-8");
byte[]聽b聽=聽byteConverter.convertAll(c);
杩欎袱涓被宸茬粡琚� Charset 绫诲彇浠ｏ紝Charset 鎻愪緵 encode 涓� decode 鍒嗗埆瀵瑰簲 char[] 鍒� byte[] 鐨勭紪鐮佸拰 byte[] 鍒� char[] 鐨勮В鐮併�傚涓嬩唬鐮佹墍绀猴細
Java浠ｇ爜
Charset聽charset聽=聽Charset.forName("UTF-8");
ByteBuffer聽byteBuffer聽=聽charset.encode(string);
CharBuffer聽charBuffer聽=聽charset.decode(byteBuffer);
缂栫爜涓庤В鐮侀兘鍦ㄤ竴涓被涓畬鎴愶紝閫氳繃 forName 璁剧疆缂栬В鐮佸瓧绗﹂泦锛岃繖鏍锋洿瀹规槗缁熶竴缂栫爜鏍煎紡锛屾瘮 ByteToCharConverter 鍜� CharToByteConverter 绫绘洿鏂逛究銆�
Java 涓繕鏈変竴涓� ByteBuffer 绫伙紝瀹冩彁渚涗竴绉� char 鍜� byte 涔嬮棿鐨勮蒋杞崲锛屽畠浠箣闂磋浆鎹笉闇�瑕佺紪鐮佷笌瑙ｇ爜锛屽彧鏄妸涓�涓� 16bit 鐨� char 鏍煎紡锛屾媶鍒嗘垚涓� 2 涓� 8bit 鐨� byte 琛ㄧず锛屽畠浠殑瀹為檯鍊煎苟娌℃湁琚慨鏀癸紝浠呬粎鏄暟鎹殑绫诲瀷鍋氫簡杞崲銆傚涓嬩唬鐮佹墍浠ワ細
Java浠ｇ爜
ByteBuffer聽heapByteBuffer聽=聽ByteBuffer.allocate(1024);
ByteBuffer聽byteBuffer聽=聽heapByteBuffer.putChar(c);
浠ヤ笂杩欎簺鎻愪緵瀛楃鍜屽瓧鑺備箣闂寸殑鐩镐簰杞崲鍙鎴戜滑璁剧疆缂栬В鐮佹牸寮忕粺涓�涓�鑸兘涓嶄細鍑虹幇闂銆�
Java 涓浣曠紪瑙ｇ爜
鍓嶉潰浠嬬粛浜嗗嚑绉嶅父瑙佺殑缂栫爜鏍煎紡锛岃繖閲屽皢浠ュ疄闄呬緥瀛愪粙缁� Java 涓浣曞疄鐜扮紪鐮佸強瑙ｇ爜锛屼笅闈㈡垜浠互鈥淚 am 鍚涘北鈥濊繖涓瓧绗︿覆涓轰緥浠嬬粛 Java 涓浣曟妸瀹冧互 ISO-8859-1銆丟B2312銆丟BK銆乁TF-16銆乁TF-8 缂栫爜鏍煎紡杩涜缂栫爜鐨勩��
Java浠ｇ爜
publicstaticvoid聽encode()聽{
String聽name聽="I聽am聽鍚涘北";
toHex(name.toCharArray());
try聽{
byte[]聽iso8859聽=聽name.getBytes("ISO-8859-1");
toHex(iso8859);
byte[]聽gb2312聽=聽name.getBytes("GB2312");
toHex(gb2312);
byte[]聽gbk聽=聽name.getBytes("GBK");
toHex(gbk);
byte[]聽utf16聽=聽name.getBytes("UTF-16");
toHex(utf16);
byte[]聽utf8聽=聽name.getBytes("UTF-8");
toHex(utf8);
}catch聽(UnsupportedEncodingException聽e)聽{
e.printStackTrace();
}
}
鎴戜滑鎶� name 瀛楃涓叉寜鐓у墠闈㈣鐨勫嚑绉嶇紪鐮佹牸寮忚繘琛岀紪鐮佽浆鍖栨垚 byte 鏁扮粍锛岀劧鍚庝互 16 杩涘埗杈撳嚭锛屾垜浠厛鐪嬩竴涓� Java 鏄浣曡繘琛岀紪鐮佺殑銆�
涓嬮潰鏄� Java 涓紪鐮侀渶瑕佺敤鍒扮殑绫诲浘
鍥� 1. Java 缂栫爜绫诲浘
棣栧厛鏍规嵁鎸囧畾鐨� charsetName 閫氳繃 Charset.forName(charsetName) 璁剧疆 Charset 绫伙紝鐒跺悗鏍规嵁 Charset 鍒涘缓 CharsetEncoder 瀵硅薄锛屽啀璋冪敤 CharsetEncoder.encode 瀵瑰瓧绗︿覆杩涜缂栫爜锛屼笉鍚岀殑缂栫爜绫诲瀷閮戒細瀵瑰簲鍒颁竴涓被涓紝瀹為檯鐨勭紪鐮佽繃绋嬫槸鍦ㄨ繖浜涚被涓畬鎴愮殑銆備笅闈㈡槸 String. getBytes(charsetName) 缂栫爜杩囩▼鐨勬椂搴忓浘
鍥� 2.Java 缂栫爜鏃跺簭鍥�
浠庝笂鍥惧彲浠ョ湅鍑烘牴鎹� charsetName 鎵惧埌 Charset 绫伙紝鐒跺悗鏍规嵁杩欎釜瀛楃闆嗙紪鐮佺敓鎴� CharsetEncoder锛岃繖涓被鏄墍鏈夊瓧绗︾紪鐮佺殑鐖剁被锛岄拡瀵逛笉鍚岀殑瀛楃缂栫爜闆嗗湪鍏跺瓙绫讳腑瀹氫箟浜嗗浣曞疄鐜扮紪鐮侊紝鏈変簡 CharsetEncoder 瀵硅薄鍚庡氨鍙互璋冪敤 encode 鏂规硶鍘诲疄鐜扮紪鐮佷簡銆傝繖涓槸 String.getBytes 缂栫爜鏂规硶锛屽叾瀹冪殑濡� StreamEncoder 涓篃鏄被浼肩殑鏂瑰紡銆備笅闈㈢湅鐪嬩笉鍚岀殑瀛楃闆嗘槸濡備綍灏嗗墠闈㈢殑瀛楃涓茬紪鐮佹垚 byte 鏁扮粍鐨勶紵
濡傚瓧绗︿覆鈥淚 am 鍚涘北鈥濈殑 char 鏁扮粍涓� 49 20 61 6d 20 541b 5c71锛屼笅闈㈡妸瀹冩寜鐓т笉鍚岀殑缂栫爜鏍煎紡杞寲鎴愮浉搴旂殑瀛楄妭銆�
鎸夌収 ISO-8859-1 缂栫爜
瀛楃涓测�淚 am 鍚涘北鈥濈敤 ISO-8859-1 缂栫爜锛屼笅闈㈡槸缂栫爜缁撴灉锛�
浠庝笂鍥剧湅鍑� 7 涓� char 瀛楃缁忚繃 ISO-8859-1 缂栫爜杞彉鎴� 7 涓� byte 鏁扮粍锛孖SO-8859-1 鏄崟瀛楄妭缂栫爜锛屼腑鏂団�滃悰灞扁�濊杞寲鎴愬�兼槸 3f 鐨� byte銆�3f 涔熷氨鏄�滐紵鈥濆瓧绗︼紝鎵�浠ョ粡甯镐細鍑虹幇涓枃鍙樻垚鈥滐紵鈥濆緢鍙兘灏辨槸閿欒鐨勪娇鐢ㄤ簡 ISO-8859-1 杩欎釜缂栫爜瀵艰嚧鐨勩�備腑鏂囧瓧绗︾粡杩� ISO-8859-1 缂栫爜浼氫涪澶变俊鎭紝閫氬父鎴戜滑绉颁箣涓衡�滈粦娲炩�濓紝瀹冧細鎶婁笉璁よ瘑鐨勫瓧绗﹀惛鏀舵帀銆傜敱浜庣幇鍦ㄥぇ閮ㄥ垎鍩虹鐨� Java 妗嗘灦鎴栫郴缁熼粯璁ょ殑瀛楃闆嗙紪鐮侀兘鏄� ISO-8859-1锛屾墍浠ュ緢瀹规槗鍑虹幇涔辩爜闂锛屽悗闈㈠皢浼氬垎鏋愪笉鍚岀殑涔辩爜褰㈠紡鏄�庝箞鍑虹幇鐨勩��
鎸夌収 GB2312 缂栫爜
瀛楃涓测�淚 am 鍚涘北鈥濈敤 GB2312 缂栫爜锛屼笅闈㈡槸缂栫爜缁撴灉锛�
GB2312 瀵瑰簲鐨� Charset 鏄� sun.nio.cs.ext. EUC_CN 鑰屽搴旂殑 CharsetDecoder 缂栫爜绫绘槸 sun.nio.cs.ext. DoubleByte锛孏B2312 瀛楃闆嗘湁涓�涓� char 鍒� byte 鐨勭爜琛紝涓嶅悓鐨勫瓧绗︾紪鐮佸氨鏄煡杩欎釜鐮佽〃鎵惧埌涓庢瘡涓瓧绗︾殑瀵瑰簲鐨勫瓧鑺傦紝鐒跺悗鎷艰鎴� byte 鏁扮粍銆傛煡琛ㄧ殑瑙勫垯濡備笅锛�
Java浠ｇ爜
c2b[c2bIndex[char聽>>8]聽+聽(char聽&0xff)]
濡傛灉鏌ュ埌鐨勭爜浣嶅�煎ぇ浜� oxff 鍒欐槸鍙屽瓧鑺傦紝鍚﹀垯鏄崟瀛楄妭銆傚弻瀛楄妭楂� 8 浣嶄綔涓虹涓�涓瓧鑺傦紝浣� 8 浣嶄綔涓虹浜屼釜瀛楄妭锛屽涓嬩唬鐮佹墍绀猴細
Java浠ｇ爜
if聽(bb聽>0xff)聽{//聽DoubleByte
if聽(dl聽-聽dp聽<2)
return聽CoderResult.OVERFLOW;
da[dp++]聽=聽(byte)聽(bb聽>>8);
da[dp++]聽=聽(byte)聽bb;
}else聽{//聽SingleByte
if聽(dl聽-聽dp聽<1)
return聽CoderResult.OVERFLOW;
da[dp++]聽=聽(byte)聽bb;
}
浠庝笂鍥惧彲浠ョ湅鍑哄墠 5 涓瓧绗︾粡杩囩紪鐮佸悗浠嶇劧鏄� 5 涓瓧鑺傦紝鑰屾眽瀛楄缂栫爜鎴愬弻瀛楄妭锛屽湪绗竴鑺備腑浠嬬粛鍒� GB2312 鍙敮鎸� 6763 涓眽瀛楋紝鎵�浠ュ苟涓嶆槸鎵�鏈夋眽瀛楅兘鑳藉鐢� GB2312 缂栫爜銆�
鎸夌収 GBK 缂栫爜
瀛楃涓测�淚 am 鍚涘北鈥濈敤 GBK 缂栫爜锛屼笅闈㈡槸缂栫爜缁撴灉锛�
浣犲彲鑳藉凡缁忓彂鐜颁笂鍥句笌 GB2312 缂栫爜鐨勭粨鏋滄槸涓�鏍风殑锛屾病閿� GBK 涓� GB2312 缂栫爜缁撴灉鏄竴鏍风殑锛岀敱姝ゅ彲浠ュ緱鍑� GBK 缂栫爜鏄吋瀹� GB2312 缂栫爜鐨勶紝瀹冧滑鐨勭紪鐮佺畻娉曚篃鏄竴鏍风殑銆備笉鍚岀殑鏄畠浠殑鐮佽〃闀垮害涓嶄竴鏍凤紝GBK 鍖呭惈鐨勬眽瀛楀瓧绗︽洿澶氥�傛墍浠ュ彧瑕佹槸缁忚繃 GB2312 缂栫爜鐨勬眽瀛楅兘鍙互鐢� GBK 杩涜瑙ｇ爜锛屽弽杩囨潵鍒欎笉鐒躲��
鎸夌収 UTF-16 缂栫爜
瀛楃涓测�淚 am 鍚涘北鈥濈敤 UTF-16 缂栫爜锛屼笅闈㈡槸缂栫爜缁撴灉锛�
鐢� UTF-16 缂栫爜灏� char 鏁扮粍鏀惧ぇ浜嗕竴鍊嶏紝鍗曞瓧鑺傝寖鍥村唴鐨勫瓧绗︼紝鍦ㄩ珮浣嶈ˉ 0 鍙樻垚涓や釜瀛楄妭锛屼腑鏂囧瓧绗︿篃鍙樻垚涓や釜瀛楄妭銆備粠 UTF-16 缂栫爜瑙勫垯鏉ョ湅锛屼粎浠呭皢瀛楃鐨勯珮浣嶅拰鍦颁綅杩涜鎷嗗垎鍙樻垚涓や釜瀛楄妭銆傜壒鐐规槸缂栫爜鏁堢巼闈炲父楂橈紝瑙勫垯寰堢畝鍗曪紝鐢变簬涓嶅悓澶勭悊鍣ㄥ 2 瀛楄妭澶勭悊鏂瑰紡涓嶅悓锛孊ig-endian锛堥珮浣嶅瓧鑺傚湪鍓嶏紝浣庝綅瀛楄妭鍦ㄥ悗锛夋垨 Little-endian锛堜綆浣嶅瓧鑺傚湪鍓嶏紝楂樹綅瀛楄妭鍦ㄥ悗锛夌紪鐮侊紝鎵�浠ュ湪瀵逛竴涓插瓧绗︿覆杩涜缂栫爜鏄渶瑕佹寚鏄庡埌搴曟槸 Big-endian 杩樻槸 Little-endian锛屾墍浠ュ墠闈㈡湁涓や釜瀛楄妭鐢ㄦ潵淇濆瓨 BYTE_ORDER_MARK 鍊硷紝UTF-16 鏄敤瀹氶暱 16 浣嶏紙2 瀛楄妭锛夋潵琛ㄧず鐨� UCS-2 鎴� Unicode 杞崲鏍煎紡锛岄�氳繃浠ｇ悊瀵规潵璁块棶 BMP 涔嬪鐨勫瓧绗︾紪鐮併��
鎸夌収 UTF-8 缂栫爜
瀛楃涓测�淚 am 鍚涘北鈥濈敤 UTF-8 缂栫爜锛屼笅闈㈡槸缂栫爜缁撴灉锛�
UTF-16 铏界劧缂栫爜鏁堢巼寰堥珮锛屼絾鏄鍗曞瓧鑺傝寖鍥村唴瀛楃涔熸斁澶т簡涓�鍊嶏紝杩欐棤褰篃娴垂浜嗗瓨鍌ㄧ┖闂达紝鍙﹀ UTF-16 閲囩敤椤哄簭缂栫爜锛屼笉鑳藉鍗曚釜瀛楃鐨勭紪鐮佸�艰繘琛屾牎楠岋紝濡傛灉涓棿鐨勪竴涓瓧绗︾爜鍊兼崯鍧忥紝鍚庨潰鐨勬墍鏈夌爜鍊奸兘灏嗗彈褰卞搷銆傝�� UTF-8 杩欎簺闂閮戒笉瀛樺湪锛孶TF-8 瀵瑰崟瀛楄妭鑼冨洿鍐呭瓧绗︿粛鐒剁敤涓�涓瓧鑺傝〃绀猴紝瀵规眽瀛楅噰鐢ㄤ笁涓瓧鑺傝〃绀恒�傚畠鐨勭紪鐮佽鍒欏涓嬶細
Java浠ｇ爜
private聽CoderResult聽encodeArrayLoop(CharBuffer聽src,
ByteBuffer聽dst){
char[]聽sa聽=聽src.array();
int聽sp聽=聽src.arrayOffset()聽+聽src.position();
int聽sl聽=聽src.arrayOffset()聽+聽src.limit();
byte[]聽da聽=聽dst.array();
int聽dp聽=聽dst.arrayOffset()聽+聽dst.position();
int聽dl聽=聽dst.arrayOffset()聽+聽dst.limit();
int聽dlASCII聽=聽dp聽+聽Math.min(sl聽-聽sp,聽dl聽-聽dp);
//聽ASCII聽only聽loop
while聽(dp聽<聽dlASCII聽&&聽sa[sp]聽<'\u0080')
da[dp++]聽=聽(byte)聽sa[sp++];
while聽(sp聽<聽sl)聽{
char聽c聽=聽sa[sp];
if聽(c聽<0x80)聽{
//聽Have聽at聽most聽seven聽bits
if聽(dp聽>=聽dl)
return聽overflow(src,聽sp,聽dst,聽dp);
da[dp++]聽=聽(byte)c;
}elseif聽(c聽<0x800)聽{
//聽2聽bytes,聽11聽bits
if聽(dl聽-聽dp聽<2)
return聽overflow(src,聽sp,聽dst,聽dp);
da[dp++]聽=聽(byte)(0xc0|聽(c聽>>6));
da[dp++]聽=聽(byte)(0x80|聽(c聽&0x3f));
}elseif聽(Character.isSurrogate(c))聽{
//聽Have聽a聽surrogate聽pair
if聽(sgp聽==null)
sgp聽=new聽Surrogate.Parser();
int聽uc聽=聽sgp.parse(c,聽sa,聽sp,聽sl);
if聽(uc聽<0)聽{
updatePositions(src,聽sp,聽dst,聽dp);
return聽sgp.error();
}
if聽(dl聽-聽dp聽<4)
return聽overflow(src,聽sp,聽dst,聽dp);
da[dp++]聽=聽(byte)(0xf0|聽((uc聽>>18)));
da[dp++]聽=聽(byte)(0x80|聽((uc聽>>12)聽&0x3f));
da[dp++]聽=聽(byte)(0x80|聽((uc聽>>6)聽&0x3f));
da[dp++]聽=聽(byte)(0x80|聽(uc聽&0x3f));
sp++;//聽2聽chars
}else聽{
//聽3聽bytes,聽16聽bits
if聽(dl聽-聽dp聽<3)
return聽overflow(src,聽sp,聽dst,聽dp);
da[dp++]聽=聽(byte)(0xe0|聽((c聽>>12)));
da[dp++]聽=聽(byte)(0x80|聽((c聽>>6)聽&0x3f));
da[dp++]聽=聽(byte)(0x80|聽(c聽&0x3f));
}
sp++;
}
updatePositions(src,聽sp,聽dst,聽dp);
return聽CoderResult.UNDERFLOW;
}
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