Package org.h2.util

Class NetUtils

java.lang.Object
org.h2.util.NetUtils
public class NetUtils extends Object
This utility class contains socket helper functions.

  • Method Details

    • createLoopbackSocket

      public static Socket createLoopbackSocket(int port, boolean ssl) throws IOException
      Create a loopback socket (a socket that is connected to localhost) on this port.
      Parameters:
      port - the port
      ssl - if SSL should be used
      Returns:
      the socket
      Throws:
      IOException - on failure

    • createSocket

      public static Socket createSocket(String server, int defaultPort, boolean ssl) throws IOException
      Create a client socket that is connected to the given address and port.
      Parameters:
      server - to connect to (including an optional port)
      defaultPort - the default port (if not specified in the server address)
      ssl - if SSL should be used
      Returns:
      the socket
      Throws:
      IOException - on failure

    • createSocket

      public static Socket createSocket(String server, int defaultPort, boolean ssl, int networkTimeout) throws IOException
      Create a client socket that is connected to the given address and port.
      Parameters:
      server - to connect to (including an optional port)
      defaultPort - the default port (if not specified in the server address)
      ssl - if SSL should be used
      networkTimeout - socket so timeout
      Returns:
      the socket
      Throws:
      IOException - on failure

    • createSocket

      public static Socket createSocket(InetAddress address, int port, boolean ssl) throws IOException
      Create a client socket that is connected to the given address and port.
      Parameters:
      address - the address to connect to
      port - the port
      ssl - if SSL should be used
      Returns:
      the socket
      Throws:
      IOException - on failure

    • createSocket

      public static Socket createSocket(InetAddress address, int port, boolean ssl, int networkTimeout) throws IOException
      Create a client socket that is connected to the given address and port.
      Parameters:
      address - the address to connect to
      port - the port
      ssl - if SSL should be used
      networkTimeout - socket so timeout
      Returns:
      the socket
      Throws:
      IOException - on failure

    • createServerSocket

      public static ServerSocket createServerSocket(int port, boolean ssl)
      Create a server socket. The system property h2.bindAddress is used if set.
      Parameters:
      port - the port to listen on
      ssl - if SSL should be used
      Returns:
      the server socket

    • isLocalAddress

      public static boolean isLocalAddress(Socket socket) throws UnknownHostException
      Check if a socket is connected to a local address.
      Parameters:
      socket - the socket
      Returns:
      true if it is
      Throws:
      UnknownHostException - on failure

    • closeSilently

      public static ServerSocket closeSilently(ServerSocket socket)
      Close a server socket and ignore any exceptions.
      Parameters:
      socket - the socket
      Returns:
      null

    • getLocalAddress

      public static String getLocalAddress()
      Get the local host address as a string. For performance, the result is cached for one second.
      Returns:
      the local host address

    • getHostName

      public static String getHostName(String localAddress)
      Get the host name of a local address, if available.
      Parameters:
      localAddress - the local address
      Returns:
      the host name, or another text if not available

    • ipToShortForm

      public static StringBuilder ipToShortForm(StringBuilder builder, byte[] address, boolean addBrackets)
      Appends short representation of the specified IP address to the string builder.
      Parameters:
      builder - string builder to append to, or null
      address - IP address
      addBrackets - if (true, add brackets around IPv6 addresses
      Returns:
      the specified or the new string builder with short representation of specified address