code: public static String downloadString(String url, Charset customCharset, StreamProgress streamPress) {
  		if (StrUtil.isBlank(url)) {
  			throw new NullPointerException("[url] is null!");
  		}
  
  		FastByteArrayOutputStream out = new FastByteArrayOutputStream();
  		download(url, out, true, streamPress);
  		return null == customCharset ? out.toString() : out.toString(customCharset);
  	}
docs: 下载远程文本
  
  @param url 请求的url
  @param customCharset 自定义的字符集，可以使用{@link CharsetUtil#charset} 方法转换
  @param streamPress 进度条 {@link StreamProgress}
  @return 文本