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

booleanisBound(int port)
is Bound 
Socket socket = null;
try {
    socket = new Socket("localhost", port);
    socket.setReuseAddress(true);
    return true;
} catch (UnknownHostException e) {
    throw new RuntimeException(e);
} catch (ConnectException ignored) {
...
booleanisConnectionAlive(String protocol, String host, int port)
is Connection Alive 
boolean isAlive = true;
try {
    URL url = new URL(protocol, host, port, "");
    URLConnection connection = url.openConnection();
    connection.connect();
} catch (Exception e) {
    isAlive = false;
return isAlive;
booleanisFreePort(int portNumber)
Checks whether the given TCP port is available. 
try {
    ServerSocket socket = new ServerSocket(portNumber);
    socket.setReuseAddress(true);
    socket.close();
    return true;
} catch (IOException e) {
    return false;
booleanisFreeTCPPort(final int port)
is Free TCP Port 
try {
    final ServerSocket ss = new ServerSocket(port);
    ss.setReuseAddress(true);
    ss.close();
    return true;
} catch (final Throwable t) {
    t.printStackTrace();
    return false;
...
booleanisHostAvailable(final String host, final int port)
Returns whether the given host is accepting connections on the given port. 
assert host != null : "the host must not be null";
assert !host.isEmpty() : "the host must not be empty";
assert port >= 0 && port <= UPPER_PORT_BOUND : "the port be within the range 0 - 65535";
Socket socket = new Socket();
try {
    socket.connect(new InetSocketAddress(host, port), CONNECTION_TIMEOUT);
} catch (IOException ex) {
    try {
...
booleanisHostReachable(String host, int port, int connTimeout)
Checks whether the given host and port is reachable or not. 
Socket socket = null;
boolean reachable = false;
try {
    socket = new Socket();
    socket.connect(new InetSocketAddress(host, port), connTimeout);
    reachable = true;
} catch (IOException ioe) {
} finally {
...
booleanisListening(String host, int port)
is Listening 
Socket socket = null;
try {
    socket = new Socket(host, port);
    return socket.isConnected();
} catch (ConnectException e) {
    return false;
} finally {
    if (socket != null) {
...
booleanisLivereloadAvailable(int port)
is Livereload Available 
try {
    HttpURLConnection.setFollowRedirects(false);
    URL url = new URL("http://localhost:" + port + "/livereload.js"); 
    HttpURLConnection con = (HttpURLConnection) url.openConnection();
    con.setConnectTimeout(1000);
    con.setRequestMethod("HEAD"); 
    return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
} catch (IOException e) {
...
booleanisLocalPortAvailable(final int port)
Checks to see if a specific local port is available. 
try (final DatagramSocket ds = new DatagramSocket(port); final ServerSocket ss = new ServerSocket(port)) {
    ss.setReuseAddress(true);
    ds.setReuseAddress(true);
    return true;
} catch (final IOException ignored) {
    return false;
booleanisLocalPortFree(final int port)
is Local Port Free 
try {
    new ServerSocket(port).close();
    return true;
} catch (final IOException e) {
    return false;