code: public static String toAddressString(InetSocketAddress address) {
          if (address == null) {
              return StringUtils.EMPTY;
          } else {
              return toIpString(address) + ":" + address.getPort();
          }
      }
docs: InetSocketAddress转 host:port 字符串
  
  @param address InetSocketAddress转
  @return host:port 字符串