java 汉字转首字母

1. private final static int[] li_SecPosValue = { 1601, 1637, 1833, 2078, 2274,
           2302, 2433, 2594, 2787, 3106, 3212, 3472, 3635, 3722, 3730, 3858,
           4027, 4086, 4390, 4558, 4684, 4925, 5249, 5590 };
   private final static String[] lc_FirstLetter = { "a", "b", "c", "d", "e",
           "f", "g", "h", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s",
           "t", "w", "x", "y", "z" };
   
   /**
    * 取得给定汉字串的首字母串,即声母串
    * @param str 给定汉字串
    * @return 声母串
    */
   public String getAllFirstLetter(String str) {
       if (str == null || str.trim().length() == 0) {
           return "";
       }
   
       String _str = "";
       for (int i = 0; i < str.length(); i++) {
           _str = _str + this.getFirstLetter(str.substring(i, i + 1));
       }
   
       return _str;
   }
   
   /**
    * 取得给定汉字的首字母,即声母
    * @param chinese 给定的汉字
    * @return 给定汉字的声母
    */
   public String getFirstLetter(String chinese) {
       if (chinese == null || chinese.trim().length() == 0) {
           return "";
       }
       chinese = this.conversionStr(chinese, "GB2312", "ISO8859-1");
   
       if (chinese.length() > 1) // 判断是不是汉字
       {
           int li_SectorCode = (int) chinese.charAt(0); // 汉字区码
           int li_PositionCode = (int) chinese.charAt(1); // 汉字位码
           li_SectorCode = li_SectorCode - 160;
           li_PositionCode = li_PositionCode - 160;
           int li_SecPosCode = li_SectorCode * 100 + li_PositionCode; // 汉字区位码
           if (li_SecPosCode > 1600 && li_SecPosCode < 5590) {
               for (int i = 0; i < 23; i++) {
                   if (li_SecPosCode >= li_SecPosValue[i]
                       && li_SecPosCode < li_SecPosValue[i + 1]) {
                       chinese = lc_FirstLetter[i];
                       break;
                   }
               }
           } else // 非汉字字符,如图形符号或ASCII码
           {
               chinese = this.conversionStr(chinese, "ISO8859-1", "GB2312");
               chinese = chinese.substring(0, 1);
           }
       }
   
       return chinese;
   }
   
   /**
    * 字符串编码转换
    * @param str 要转换编码的字符串
    * @param charsetName 原来的编码
    * @param toCharsetName 转换后的编码
    * @return 经过编码转换后的字符串
    */
   private String conversionStr(String str, String charsetName,String toCharsetName) {
       try {
           str = new String(str.getBytes(charsetName), toCharsetName);
       } catch (Exception ex) {
           System.out.println("字符串编码转换异常：" + ex.getMessage());
       }
       return str;
   }
   
   public  void main(String[] args) {
     //  ChineseCharToEn cte = new ChineseCharToEn();
       System.out.println("获取拼音首字母："+ getAllFirstLetter("北京联席办"));
   }