java中按字节截取String字符串.

    /**
     * 取字符串的前toCount个字符
     *
     * @param str 被处理字符串
     * @param toCount 截取长度
     * @param more 后缀字符串
     * @version 2004.11.24
     * @author zhulx
     * @return String
     */
    public static String substring(String str, int toCount,String more)
    {
      int reInt = 0;
      String reStr = "";
      if (str == null)
        return "";
      char[] tempChar = str.toCharArray();
      for (int kk = 0; (kk < tempChar.length && toCount > reInt); kk++) {
        String s1 = str.valueOf(tempChar[kk]);
        byte[] b = s1.getBytes();
        reInt += b.length;
        reStr += tempChar[kk];
      }
      if (toCount == reInt || (toCount == reInt - 1))
        reStr += more;
      return reStr;
    }

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