Java 全角半角假名转换以及验证

一. 全角假名转换半角假名

publicclassTest{privatestaticfinalchar[]ZENKAKU_KATAKANA={'ァ','ア','ィ','イ','ゥ','ウ','ェ','エ','ォ','オ','カ','ガ','キ','ギ','ク','グ','ケ','ゲ','コ','ゴ','サ','ザ','シ','ジ','ス','ズ','セ','ゼ','ソ','ゾ','タ','ダ','チ','ヂ','ッ','ツ','ヅ','テ','デ','ト','ド','ナ','ニ','ヌ','ネ','ノ','ハ','バ','パ','ヒ','ビ','ピ','フ','ブ','プ','ヘ','ベ','ペ','ホ','ボ','ポ','マ','ミ','ム','メ','モ','ャ','ヤ','ュ','ユ','ョ','ヨ','ラ','リ','ル','レ','ロ','ヮ','ワ','ヰ','ヱ','ヲ','ン','ヴ','ヵ','ヶ'};privatestaticfinalString[]HANKAKU_KATAKANA={"ｧ","ｱ","ｨ","ｲ","ｩ","ｳ","ｪ","ｴ","ｫ","ｵ","ｶ","ｶﾞ","ｷ","ｷﾞ","ｸ","ｸﾞ","ｹ","ｹﾞ","ｺ","ｺﾞ","ｻ","ｻﾞ","ｼ","ｼﾞ","ｽ","ｽﾞ","ｾ","ｾﾞ","ｿ","ｿﾞ","ﾀ","ﾀﾞ","ﾁ","ﾁﾞ","ｯ","ﾂ","ﾂﾞ","ﾃ","ﾃﾞ","ﾄ","ﾄﾞ","ﾅ","ﾆ","ﾇ","ﾈ","ﾉ","ﾊ","ﾊﾞ","ﾊﾟ","ﾋ","ﾋﾞ","ﾋﾟ","ﾌ","ﾌﾞ","ﾌﾟ","ﾍ","ﾍﾞ","ﾍﾟ","ﾎ","ﾎﾞ","ﾎﾟ","ﾏ","ﾐ","ﾑ","ﾒ","ﾓ","ｬ","ﾔ","ｭ","ﾕ","ｮ","ﾖ","ﾗ","ﾘ","ﾙ","ﾚ","ﾛ","ﾜ","ﾜ","ｲ","ｴ","ｦ","ﾝ","ｳﾞ","ｶ","ｹ"};publicstaticfinalcharZENKAKU_KATAKANA_FIRST_CHAR=ZENKAKU_KATAKANA[0];publicstaticfinalcharZENKAKU_KATAKANA_LAST_CHAR=ZENKAKU_KATAKANA[ZENKAKU_KATAKANA.length-1];// 全角假名转换为半角假名publicstaticStringzenkakuKkToHankakuKk(Stringstr){StringBuildersb=newStringBuilder();for(inti=0;i<str.length();i++){charoriginalChar=str.charAt(i);StringconvertedChar=zenkakuKatakanaToHankakuKatakana(originalChar);sb.append(convertedChar);}returnsb.toString();}publicstaticStringzenkakuKatakanaToHankakuKatakana(charstr){if(str>=ZENKAKU_KATAKANA_FIRST_CHAR&&str<=ZENKAKU_KATAKANA_LAST_CHAR){returnHANKAKU_KATAKANA[str-ZENKAKU_KATAKANA_FIRST_CHAR];}else{returnString.valueOf(str);}}publicstaticvoidmain(String[]args){// 全角假名转换为半角假名Stringresult=zenkakuKkToHankakuKk("カ メイイ");System.out.println(result);// ｶ ﾒｲｲ}}

二. 验证是否为半角假名

publicclassTest{publicstaticfinalStringBLANK="";// 改行文字publicstaticfinalStringNEWLINE_CRLF="\r\n";// 改行文字publicstaticfinalStringNEWLINE_LF="\n";// 消除转义符publicstaticStringnewLineEscape(Stringstr){if(str==null||BLANK.equals(str)){returnBLANK;}returnstr.replaceAll(NEWLINE_CRLF,BLANK).replaceAll(NEWLINE_LF,BLANK);}// 验证是否为半角假名publicstaticbooleanvalidateIsHanKatakana(Stringvalue){if(value==null||BLANK.equals(value)){returntrue;}Stringstr=newLineEscape(value);char[]chars=String.valueOf(str).toCharArray();for(charaChar:chars){if(!((0xFF61<=aChar&&aChar<=0xFF9F)||0x0020==aChar)){returnfalse;}}returntrue;}publicstaticvoidmain(String[]args){// 验证是否为半角假名System.out.println(validateIsHanKatakana("カ メイイ"));// falseSystem.out.println(validateIsHanKatakana("ｶ ﾒｲｲ"));// true}}

三. 通过icu4库进行处理

• 官方Github：https://github.com/unicode-org/icu

🔷pom依赖

<dependency><groupId>com.ibm.icu</groupId><artifactId>icu4j</artifactId><!--此版本过时,Maven仓库获取最新版本--><version>3.4.4</version></dependency>

🔷代码

importcom.ibm.icu.text.Transliterator;⏹全角转换半角Transliteratorliterator1=Transliterator.getInstance("Fullwidth-Halfwidth");literator1.transliterate("カナ");// ｶﾅ⏹半角转换全角Transliteratorliterator2=Transliterator.getInstance("Halfwidth-Fullwidth");literator2.transliterate("ｶﾅ");// カナ⏹平假名转换片假名Transliteratorliterator4=Transliterator.getInstance("Hiragana-Katakana");literator4.transliterate("なし");// ナシ⏹片假名转换平假名Transliteratorliterator3=Transliterator.getInstance("Katakana-Hiragana");literator3.transliterate("カナ");// かな