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

intgetRandomPort()
get Random Port 
try (ServerSocket s = new ServerSocket(0)) {
    return s.getLocalPort();
} catch (IOException e) {
    throw new RuntimeException("Can't get random port");
ListgetRandomPorts(int n)
Create a list of currently available port numbers as strings. 
List<String> ports = new ArrayList<>();
for (int i = 0; i < n; i++) {
    ports.add(String.valueOf(getRandomPort()));
return ports;
StringgetResponse(String name, String host, int port)
get Response 
URL url = new URL("http://" + host + ":" + port + "/" + name);
HttpURLConnection connection = connect(url);
return toString(new BufferedInputStream(connection.getInputStream()));
intgetServerPort()
Get a server socket point for server, either TCP or UDP. 
int serverPort = 0;
try {
    ServerSocket serverSocket = new ServerSocket(0);
    serverPort = serverSocket.getLocalPort();
    serverSocket.close();
} catch (IOException e) {
    throw new RuntimeException("Failed to get a server socket point");
return serverPort;
String[]getSupportedConnectionTypes(Map map)
get Supported Connection Types 
String[] types = null;
Object[] typeObjs = (Object[]) map.get("supportedConnectionTypes");
if (typeObjs != null) {
    types = new String[typeObjs.length];
    for (int i = 0; i < typeObjs.length; i++) {
        types[i] = (String) typeObjs[i];
return types;
SetgetSupportedEntityTypes()
Returns a Set of supported entity types 
return supportedEntities;
intgetUnusedPort()
Get a port that isn't currently used. 
ServerSocket s = new ServerSocket(0);
int port = s.getLocalPort();
s.close();
return port;
intgetUnusedPort(final int start)
get Unused Port 
return getUnusedPort(start, DEFAULT_PORT_RANGE_END);
intgetUnusedPort(int startPort)
Returns an unused port number on the local host. 
final int nTry = 20;
for (int iPort = startPort; iPort < startPort + nTry; iPort++) {
    try {
        Socket trySocket = new Socket("localhost", iPort);
        if (!trySocket.isClosed()) {
            if (WARN_ABOUT_NOSUCHELEMENTEXCEPTIONS) {
                WARN_ABOUT_NOSUCHELEMENTEXCEPTIONS = false;
                System.err.println(
...
int[]getUnusedPorts(final int count, final int start)
get Unused Ports 
return getUnusedPorts(count, start, DEFAULT_PORT_RANGE_END);