JAVA版汉字转拼音缩写程序

JAVA版汉字转拼音缩写程序
参考:http://www.360doc.com/content/081106/15/61497_1888633.html

最近正做一个根据汉字拼音缩写的查询,从网上搜了搜,觉得这种实现是最好的,但不知道原理是啥。
public class ChnToPinYin{
/**
     * 汉字转拼音缩写
     * @param str  //要转换的汉字字符串
     * @return String  //拼音缩写
     */
    public static String getPYString(String str)
    {
            String tempStr = "";
            for(int i=0; i<str.length(); i++) {
                    char c = str.charAt(i);
                    if((int)c >= 33 && (int)c <=126) {//字母和符号原样保留
                            tempStr += String.valueOf(c);
                    }
                    else {//累加拼音声母
                            tempStr += getPYChar( String.valueOf(c) );
                    }
            }
            return tempStr;
    }
    /**
     * 取单个字符的拼音声母
     * @param c  //要转换的单个汉字
     * @return String 拼音声母
     */
    public static String getPYChar(String c)
    {
            byte[] array = new byte[2];
            array = String.valueOf(c).getBytes();
            int i = (short)(array[0] - '\0' + 256) * 256 + ((short)(array[1] - '\0' + 256));
            if ( i < 0xB0A1) return "*";
            if ( i < 0xB0C5) return "a";
            if ( i < 0xB2C1) return "b";
            if ( i < 0xB4EE) return "c";
            if ( i < 0xB6EA) return "d";
            if ( i < 0xB7A2) return "e";
            if ( i < 0xB8C1) return "f";
            if ( i < 0xB9FE) return "g";
            if ( i < 0xBBF7) return "h";
            if ( i < 0xBFA6) return "j";
            if ( i < 0xC0AC) return "k";
            if ( i < 0xC2E8) return "l";
            if ( i < 0xC4C3) return "m";
            if ( i < 0xC5B6) return "n";
            if ( i < 0xC5BE) return "o";
            if ( i < 0xC6DA) return "p";
            if ( i < 0xC8BB) return "q";
            if ( i < 0xC8F6) return "r";
            if ( i < 0xCBFA) return "s";
            if ( i < 0xCDDA) return "t";
            if ( i < 0xCEF4) return "w";
            if ( i < 0xD1B9) return "x";
            if ( i < 0xD4D1) return "y";
            if ( i < 0xD7FA) return "z";
            return "*";
    }
    
    public static void main(String []g){
     System.out.println(getPYString("中国,,;$#@&avc"));
    }

}

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