code: protected void genCell(int columnMaxLen, String preChar, String value, String fillChar, String postChar, StringBuilder ret) {
  		ret.append(preChar);
  		ret.append(value);
  		for (int i=0, n=columnMaxLen-value.length() + 1; i<n; i++) {
  			ret.append(fillChar);	// 值后的填充字符，值为 " "、"-"
  		}
  		ret.append(postChar);
  	}
docs: /*
  -----------+---------+------+-----+---------+----------------
  Field     | Type    | Null | Key | Default | Remarks
  -----------+---------+------+-----+---------+----------------
  id		   | int(11) | NO	| PRI | NULL	| remarks here