Java Utililty Methods HTTP Port Find

List of utility methods to do HTTP Port Find

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Description

The list of methods to do HTTP Port Find are organized into topic(s).

Method

ListgetAvailablePortsFromRange(int portMin, int portMax, int numberOfPorts)
Returns a List of available ports within a given port range. 
List<Integer> availablePorts = new ArrayList<>();
int port = portMin;
int portCount = 0;
while ((portCount < numberOfPorts) && (port <= portMax)) {
    if (isPortAvailable(port)) {
        availablePorts.add(port);
        portCount++;
    port++;
return availablePorts;
intgetAvialablePort(final int basePort)
get Avialable Port 
if (basePort == 0) {
    return getAvailablePort();
if (basePort < 0 || basePort > 65535) {
    throw new IllegalArgumentException("Illegal port number: " + basePort);
for (int i = basePort; i <= 65535; i++) {
    if (isPortAvailable(i)) {
...
URLgetCorrectHostnamePort(String hostPort)
Method to validate if the given String represents a hostname:port. 
try {
    URL u = new URL("http://" + hostPort);
    if (u.getHost() == null) {
        throw new IllegalArgumentException(
                "The given host:port ('" + hostPort + "') doesn't contain a valid host");
    if (u.getPort() == -1) {
        throw new IllegalArgumentException(
...
intgetEffectivePort(String scheme, int specifiedPort)
get Effective Port 
return specifiedPort != -1 ? specifiedPort : getDefaultPort(scheme);
intgetEphemeralPort()
get Ephemeral Port 
int port = 0;
try {
    ServerSocket serverSocket = new ServerSocket(0);
    port = ((InetSocketAddress) serverSocket.getLocalSocketAddress()).getPort();
    serverSocket.close();
} catch (IOException e) {
    e.printStackTrace();
return port;
intgetFreeLocalPort()
Return usable free local port 
final ServerSocket socket = new ServerSocket(0);
try {
    return socket.getLocalPort();
} finally {
    socket.close();
intgetFreePort()
Retrieve a free port. 
final int port;
try (ServerSocket s = new ServerSocket(0)) {
    port = s.getLocalPort();
return port;
intgetFreePort()
Uses Minas AvailablePortFinder to find a port, starting at 14000. 
int startPort = 14000;
return getFreePort(startPort);
intgetFreePort()
Return a free port which can be used to bind to 
for (int start = START_PORT; start <= END_PORT; start++) {
    try {
        ServerSocket socket = new ServerSocket(start);
        socket.setReuseAddress(true);
        socket.close();
        return start;
    } catch (IOException e) {
throw new RuntimeException("Unable to find a free port....");
intgetFreePort()

Returns a free port number on localhost otherwise throws RuntimeException .

try (ServerSocket serverSocket = new ServerSocket(0)) {
    serverSocket.setReuseAddress(true);
    return serverSocket.getLocalPort();
} catch (IOException e) {
    throw new RuntimeException("Failed to get free port", e);