NetUtils { public static InetSocketAddress toAddress(String address) { int i = address.indexOf(':'); String host; int port; if (i > -1) { host = address.substring(0, i); port = Integer.parseInt(address.substring(i + 1)); } else { host = address; port = 0; } return new InetSocketAddress(host, port); }  static int getRandomPort(); static int getAvailablePort(); static int getAvailablePort(int port); static boolean isInvalidPort(int port); static boolean isValidAddress(String address); static boolean isLocalHost(String host); static boolean isAnyHost(String host); static boolean isInvalidLocalHost(String host); static boolean isValidLocalHost(String host); static InetSocketAddress getLocalSocketAddress(String host, int port); static String getLocalHost(); static String filterLocalHost(String host); static String getIpByConfig(); static InetAddress getLocalAddress(); static boolean isPreferredNetworkInterface(NetworkInterface networkInterface); static NetworkInterface findNetworkInterface(); static String getHostName(String address); static String getIpByHost(String hostName); static String toAddressString(InetSocketAddress address); static InetSocketAddress toAddress(String address); static String toURL(String protocol, String host, int port, String path); static void joinMulticastGroup(MulticastSocket multicastSocket, InetAddress multicastAddress); static void setInterface(MulticastSocket multicastSocket, boolean preferIpv6); static boolean matchIpExpression(String pattern, String host, int port); static boolean matchIpRange(String pattern, String host, int port); static boolean isMulticastAddress(String host);  }
@Test public void testToAddress() throws Exception { InetSocketAddress address = NetUtils.toAddress("localhost:1234"); assertThat(address.getHostName(), equalTo("localhost")); assertThat(address.getPort(), equalTo(1234)); address = NetUtils.toAddress("localhost"); assertThat(address.getHostName(), equalTo("localhost")); assertThat(address.getPort(), equalTo(0)); }