Java Utililty Methods HTTP Port Find

boolean result = false;
Socket socket = null;
try {
    socket = new Socket(domain, port);
    result = true;
} catch (UnknownHostException e) {
} catch (IOException e) {
} finally {
...

String timeStamp = "";
Socket socket = null;
BufferedReader br = null;
try {
    socket = new Socket(host, port);
    br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    timeStamp = br.readLine();
    socket.close();
...

try {
    ServerSocket socket = new ServerSocket(0);
    int port = socket.getLocalPort();
    socket.close();
    return port;
} catch (IOException e) {
    throw new RuntimeException(e);

int port = 0;
boolean portAvailable = true;
;
do {
    port = randomPort();
    portAvailable = available(port);
} while (!portAvailable);
return port;
...

int port = 0;
do {
    port = randomPort();
    try {
        ServerSocket sock = new ServerSocket(port);
        sock.close();
    } catch (IOException ex) {
        port = 0;
...

int port = 0;
do {
    port = randomPort();
    if (takenRandomPorts.contains(port)) {
        port = 0;
        continue;
    takenRandomPorts.add(port);
...

return read(host, port, null);

Socket socket = null;
try {
    socket = new Socket(domain, port);
    PrintWriter out = new PrintWriter(socket.getOutputStream());
    StringBuilder send = new StringBuilder();
    send.append("GET " + resource + " HTTP/1.0").append("\n");
    send.append("Accept: text/html").append("\n");
    send.append("\n");
...

URL url = getDatasetUrl(host, port, user, program, relation, format);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/octet-stream");
conn.setRequestMethod("PUT");
byte[] payload = dataset.getBytes("UTF-8");
conn.setFixedLengthStreamingMode(payload.length);
try {
...

final InetSocketAddress addr = parse(desc, defaultPort);
if (addr.getAddress() != null && addr.getAddress().isAnyLocalAddress()) {
    return addr;
try {
    final InetAddress host = InetAddress.getByName(addr.getHostName());
    return new InetSocketAddress(host, addr.getPort());
} catch (UnknownHostException e) {
...