把数字转换成excel的列号

今天在用POI生成Excel,写了一个从数字到excel列号的转换方法，记录下来

   public static String int2Column(final int column) 
    {
        int col = column + 1;
        int system = 26;
        char[] digArr = new char[100];
        int ind = 0;
        while (col > 0) 
        {
            int mod = col % system;
            if (mod == 0) mod = system;
            digArr[ind++] = dig2Char(mod);
            col = (col - 1) / 26;
        }
        StringBuffer bf = new StringBuffer(ind);
        for (int i = ind - 1; i >= 0; i--) 
        {
            bf.append(digArr[i]);
        }
        return bf.toString();     
    }
    
    
    private static char dig2Char(final int dig) 
    {
        int acs = dig - 1 + 'A';
        return (char)acs;     
    }