取汉字拼音首字母

package test;

public class WordToSpell {

//  国标码和区位码转换常量
     private static final int GB_SP_DIFF = 160;

// 存放国标一级汉字不同读音的起始区位码
     private static final int[] secPosvalueList = {
         1601, 1637, 1833, 2078, 2274, 2302, 2433, 2594, 2787,
         3106, 3212, 3472, 3635, 3722, 3730, 3858, 4027, 4086,
         4390, 4558, 4684, 4925, 5249, 5600};

// 存放国标一级汉字不同读音的起始区位码对应读音
     private static final char[] firstLetter = {
         'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j',
         'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
         't', 'w', 'x', 'y', 'z'};

// 获取一个字符串的拼音码
     public static String getFirstLetter(String oriStr) {
         String str = oriStr.toLowerCase();
         StringBuffer buffer = new StringBuffer();
         char ch;
         char[] temp;
         for (int i = 0; i < str.length(); i++) { //依次处理str中每个字符
             ch = str.charAt(i);
             temp = new char[] {
                 ch};
             byte[] uniCode = new String(temp).getBytes();
             if (uniCode[0] < 128 && uniCode[0] > 0) { // 非汉字
                 buffer.append(temp);
             }
             else {
                 buffer.append(convert(uniCode));
             }
         }
         return buffer.toString();
     }

     /** 获取一个汉字的拼音首字母。
      * GB码两个字节分别减去160，转换成10进制码组合就可以得到区位码
      * 例如汉字“你”的GB码是0xC4/0xE3，分别减去0xA0（160）就是0x24/0x43
      * 0x24转成10进制就是36，0x43是67，那么它的区位码就是3667，在对照表中读音为‘n’
      */

     private static char convert(byte[] bytes) {

         char result = '-';
         int secPosvalue = 0;
         int i;
         for (i = 0; i < bytes.length; i++) {
             bytes[i] -= GB_SP_DIFF;
         }
         secPosvalue = bytes[0] * 100 + bytes[1];
         for (i = 0; i < 23; i++) {
             if (secPosvalue >= secPosvalueList[i] &&
                 secPosvalue < secPosvalueList[i + 1]) {
                 result = firstLetter[i];
                 break;
             }
         }
         return result;
     }

     public static String getBarcode(String isbn) {
         String barcode = "978";
         int a = 0, b = 0;
         int m = 0;
         int c = 0; //偶数和为a，计数和为b
         //获取中间9位数字
         isbn = isbn.substring(isbn.indexOf("-") - 1, isbn.lastIndexOf("-"));
         isbn = isbn.replaceAll("-", ""); //去掉第一个-
         isbn = isbn.replaceAll("-", ""); //去掉第二个-
         barcode += isbn;
         for (int i = 0; i < barcode.length(); i++) {
             if (i % 2 == 0) {
                 b += Integer.parseInt(barcode.substring(m, m + 1));
                 m++;
             }
             else {
                 a += Integer.parseInt(barcode.substring(m, m + 1));
                 m++;
             }
         }
         a = a * 3; //偶数和乘3
         c = a + b; //a+b
         int last = 0;
         String str = c + ""; //获取c的字符串
         last = 10 - Integer.parseInt(str.substring(str.length() - 1, str.length()));
         if (last == 10) {
             last = 0;
         }
         barcode = barcode + last;
         return barcode;
     }
    
     public static void main(String[] arg){
      
      System.out.println(getFirstLetter("汉字"));
     }
 }