通过GBK编码提取中文汉字的拼音首字母

/**
* 返回首字母
* @param strChinese  到转换的字符串
* @param bUpCase    是否返回大写
* @return
*/
public static String getPYIndexStr(String strChinese, boolean bUpCase){
try{
StringBuffer buffer = new StringBuffer();
byte b[] = strChinese.getBytes("GBK");//把中文转化成byte数组
for(int i = 0; i < b.length; i++){
if((b[i] & 255) > 128){
int char1 = b[i++] & 255;
char1 <<= 8;//左移运算符用“<<”表示，是将运算符左边的对象，向左移动运算符右边指定的位数，并且在低位补零。其实，向左移n位，就相当于乘上2的n次方
int chart = char1 + (b[i] & 255);
buffer.append(getPYIndexChar((char)chart, bUpCase));
continue;
}
char c = (char)b[i];
if(!Character.isJavaIdentifierPart(c))//确定指定字符是否可以是 Java 标识符中首字符以外的部分。
c = 'A';
buffer.append(c);
}
return buffer.toString();
}catch(Exception e){
System.out.println((new StringBuilder()).append("\u53D6\u4E2D\u6587\u62FC\u97F3\u6709\u9519").append(e.getMessage()).toString());
}
return null;
}

/**
* 得到首字母
* @param strChinese   待转换的GBK字符
* @param bUpCase
* @return
*/
private static char getPYIndexChar(char strChinese, boolean bUpCase){
int charGBK = strChinese;
char result;
if(charGBK >= 45217 && charGBK <= 45252)
result = 'A';
else
if(charGBK >= 45253 && charGBK <= 45760)
result = 'B';
else
if(charGBK >= 45761 && charGBK <= 46317)
result = 'C';
else
if(charGBK >= 46318 && charGBK <= 46825)
result = 'D';
else
if(charGBK >= 46826 && charGBK <= 47009)
result = 'E';
else
if(charGBK >= 47010 && charGBK <= 47296)
result = 'F';
else
if(charGBK >= 47297 && charGBK <= 47613)
result = 'G';
else
if(charGBK >= 47614 && charGBK <= 48118)
result = 'H';
else
if(charGBK >= 48119 && charGBK <= 49061)
result = 'J';
else
if(charGBK >= 49062 && charGBK <= 49323)
result = 'K';
else
if(charGBK >= 49324 && charGBK <= 49895)
result = 'L';
else
if(charGBK >= 49896 && charGBK <= 50370)
result = 'M';
else
if(charGBK >= 50371 && charGBK <= 50613)
result = 'N';
else
if(charGBK >= 50614 && charGBK <= 50621)
result = 'O';
else
if(charGBK >= 50622 && charGBK <= 50905)
result = 'P';
else
if(charGBK >= 50906 && charGBK <= 51386)
result = 'Q';
else
if(charGBK >= 51387 && charGBK <= 51445)
result = 'R';
else
if(charGBK >= 51446 && charGBK <= 52217)
result = 'S';
else
if(charGBK >= 52218 && charGBK <= 52697)
result = 'T';
else
if(charGBK >= 52698 && charGBK <= 52979)
result = 'W';
else
if(charGBK >= 52980 && charGBK <= 53688)
result = 'X';
else
if(charGBK >= 53689 && charGBK <= 54480)
result = 'Y';
else
if(charGBK >= 54481 && charGBK <= 55289)
result = 'Z';
else
result = (char)(65 + (new Random()).nextInt(25));
if(!bUpCase)
result = Character.toLowerCase(result);
return result;
}