code: public static void printProgress(char showChar, int totalLen, double rate) {
  		Assert.isTrue(rate >= 0 && rate <= 1, "Rate must between 0 and 1 (both include)");
  		printProgress(showChar, (int) (totalLen * rate));
  	}
docs: 打印进度条
  
  @param showChar 进度条提示字符，例如“#”
  @param totalLen 总长度
  @param rate 总长度所占比取值0~1
  @since 4.5.6