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    javajohn

    金色年華

    漢字(中文)還是unicode

    漢字與 unicode 編碼相互轉化

    (2006年7月17日? 11:07:58 )

    一、???????????? 概述:

    ?????? 如果項目采用了 GBK 的編碼,那么漢字轉化就不是問題了。但是如果采用了 utf-8 的編碼,漢字的處理就相對比較麻煩一些。

    二、???????????? 功能實現:

    ??????

    代碼如下:

    ?

    ?1 ???? // ?轉為unicode
    ?2 ???? public ? static ? void ?writeUnicode( final ?DataOutputStream?out,
    ?3 ???????????? final ?String?value)? {
    ?4 ???????? try ? {
    ?5 ???????????? final ?String?unicode? = ?gbEncoding(value);
    ?6 ???????????? final ? byte []?data? = ?unicode.getBytes();
    ?7 ???????????? final ? int ?dataLength? = ?data.length;
    ?8
    ?9 ????????????System.out.println( " Data?Length?is:? " ? + ?dataLength);
    10 ????????????System.out.println( " Data?is:? " ? + ?value);
    11 ????????????out.writeInt(dataLength);? // ?先寫出字符串的長度
    12 ????????????out.write(data,? 0 ,?dataLength);? // ?然后寫出轉化后的字符串
    13 ????????}
    ? catch ?(IOException?e)? {
    14
    15 ????????}

    16 ????}

    17
    18 ???? public ? static ?String?gbEncoding( final ?String?gbString)? {
    19 ???????? char []?utfBytes? = ?gbString.toCharArray();
    20 ????????String?unicodeBytes? = ? "" ;
    21 ???????? for ?( int ?byteIndex? = ? 0 ;?byteIndex? < ?utfBytes.length;?byteIndex ++ )? {
    22 ????????????String?hexB? = ?Integer.toHexString(utfBytes[byteIndex]);
    23 ???????????? if ?(hexB.length()? <= ? 2 )? {
    24 ????????????????hexB? = ? " 00 " ? + ?hexB;
    25 ????????????}

    26 ????????????unicodeBytes? = ?unicodeBytes? + ? " \\u " ? + ?hexB;
    27 ????????}

    28 ???????? // ?System.out.println("unicodeBytes?is:?"?+?unicodeBytes);
    29 ???????? return ?unicodeBytes;
    30 ????}

    31
    32 ???? /**
    33 ?????*?This?method?will?decode?the?String?to?a?recognized?String?in?ui.
    34 ?????*?功能:將unicod碼轉為需要的格式(utf-8)
    35 ?????*? @author ?javajohn
    36 ?????*? @param ?dataStr
    37 ?????*? @return
    38 ????? */

    39 ???? public ? static ?StringBuffer?decodeUnicode( final ?String?dataStr)? {
    40 ???????? final ?StringBuffer?buffer? = ? new ?StringBuffer();
    41 ????????String?tempStr? = ? "" ;
    42 ????????String?operStr? = ?dataStr;
    43 ???????? if (operStr? != ? null ? && ?operStr.indexOf( " \\u " )? == ? - 1 )? return ?buffer.append(operStr); //
    44 ???????? if (operStr? != ? null ? && ? ! operStr.equals( "" )? && ? ! operStr.startsWith( " \\u " )) { //
    45 ????????????tempStr? = ?operStr.substring( 0 ,operStr.indexOf( " \\u " )); //?
    46????????????operStr?=?operStr.substring(operStr.indexOf("\\u"),operStr.length());//operStr字符一定是以unicode編碼字符打頭的字符串
    47????????}

    48 ????????buffer.append(tempStr);
    49 ???????? while ?(operStr? != ? null ? && ? ! operStr.equals( "" )? && ?operStr.startsWith( " \\u " )) { // 循環處理,處理對象一定是以unicode編碼字符打頭的字符串
    50 ????????????tempStr? = ?operStr.substring( 0 , 6 );
    51 ????????????operStr? = ?operStr.substring( 6 ,operStr.length());
    52 ????????????String?charStr? = ? "" ;
    53 ????????????charStr? = ?tempStr.substring( 2 ,?tempStr.length());
    54 ???????????? char ?letter? = ?( char )?Integer.parseInt(charStr,? 16 );? // ?16進制parse整形字符串。
    55 ????????????buffer.append( new ?Character(letter).toString());
    56 ???????????? if (operStr.indexOf( " \\u " )? == ? - 1 ) { //?
    57????????????????buffer.append(operStr);
    58????????????}
    else { // 處理operStr使其打頭字符為unicode字符
    59 ????????????????tempStr? = ?operStr.substring( 0 ,operStr.indexOf( " \\u " ));
    60 ????????????????operStr? = ?operStr.substring(operStr.indexOf( " \\u " ),operStr.length());
    61 ????????????????buffer.append(tempStr);
    62 ????????????}

    63 ????????}

    64 ???????? return ?buffer;
    65 ????}

    一、???????????? 結尾:

    posted on 2006-07-17 11:07 javajohn 閱讀(5543) 評論(1)  編輯  收藏 所屬分類: 我的記憶

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    # re: 漢字(中文)還是unicode 2006-07-18 17:11 小豬

    關于代碼單元和代碼點的理解:
    1、一個代碼點可能包含一個或兩個代碼單元。
    2、在我的測試程序中,“我 ”也只占用一個代碼單元。即代碼點數等于代碼單元數。
    下面是在unicode的官方網站上找到的關于unicode的中文,韓文,日文的一些說明:
    Q: I have heard that UTF-8 does not support some Japanese characters. Is this correct?

    A: There is a lot of misinformation floating around about the support of Chinese, Japanese and Korean (CJK) characters. The Unicode Standard supports all of the CJK characters from JIS X 0208, JIS X 0212, JIS X 0221, or JIS X 0213, for example, and many more. This is true no matter which encoding form of Unicode is used: UTF-8, UTF-16, or UTF-32.

    Unicode supports over 70,000 CJK characters right now, and work is underway to encode further additions. The International Standard ISO/IEC 10646 and the Unicode Standard are completely synchronized in repertoire and content. And that means that Unicode has the same repertoire as GB 18030, since that also is synchronized with ISO 10646 — although with a different ordering and byte format.
    無論是那個編碼方式(UTF-8, UTF-16, or UTF-32)都可以對中文全面支持?


    我的測試程序如下:
    public class test0 {
    public static void main(String[] args)
    {String a="我 ";
    int cuCount=a.length();
    System.out.println("the number of code units required for string \"test\" in the UTF-16 encoding is "+cuCount);
    int cpCount=a.codePointCount(0, a.length());
    System.out.println("the number of code points is "+cpCount);
    System.out.println("the end of string \"我 \" is "+a.charAt(a.length()-1));

    }

    }

    輸出結果為:
    the number of code units required for string "test" in the UTF-16 encoding is 2
    the number of code points is 2
    the end of string "我 " is [空格]

    在eclipse里面找到了set encoding選項,在里面可以設置編碼方式。  回復  更多評論   


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