code: public static InetSocketAddress buildInetSocketAddress(String host, int defaultPort) {
  		if (StrUtil.isBlank(host)) {
  			host = LOCAL_IP;
  		}
  
  		String destHost = null;
  		int port = 0;
  		int index = host.indexOf(":");
  		if (index != -1) {
  			// host:port形式
  			destHost = host.substring(0, index);
  			port = Integer.parseInt(host.substring(index + 1));
  		} else {
  			destHost = host;
  			port = defaultPort;
  		}
  
  		return new InetSocketAddress(destHost, port);
  	}
docs: 构建InetSocketAddress<br>
  当host中包含端口时（用“：”隔开），使用host中的端口，否则使用默认端口<br>
  给定host为空时使用本地host（127.0.0.1）
  
  @param host Host
  @param defaultPort 默认端口
  @return InetSocketAddress