code: private void printNewLine(PrintWriter writer, LineSeparator lineSeparator) {
  		if(null == lineSeparator) {
  			//默认换行符
  			writer.println();
  		}else {
  			//自定义换行符
  			writer.print(lineSeparator.getValue());
  		}
  	}
docs: 打印新行
  @param writer Writer
  @param lineSeparator 换行符枚举
  @since 4.0.5