Socket Class in Java

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The Socket class represents client sockets, and is a communication channel between two TCP communications ports belonging to one or two machines A socket may connect to a port on the local system, avoiding the need for a second machine, but most network software will usually involve two machines TCP sockets can't communicate with more than two machines, however If this functionality is required, a client application should establish multiple socket connections, one for each machine
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There are several constructors for the javanetSocket class Two constructors, which allowed a boolean parameter to specify whether UDP or TCP sockets were to be used, have been deprecated These constructors should not be used and are not listed here if UDP functionality is required, use a DatagramSocket (covered in 5) The easiest way to create a socket is to specify the hostname of the machine and the port of the service For example, to connect to a Web server on port 80, the following code might be used:
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try { // Connect to the specified host and port Socket mySocket = new Socket ( "wwwawlcom", 80); // } catch (Exception e) { Systemerrprintln ("Err " + e); }
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However, a wide range of constructors is available, for different situations Unless otherwise specified, all constructors are public
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protected Socket () creates an unconnected socket using the default
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implementation provided by the current socket factory Developers should not normally use this method, as it does not allow a hostname or port to be specified Socket (InetAddress address int port) throws javaioIOException, javalangSecurityException creates a socket connected to the specified IP address and port If a connection cannot be established, or if connecting to that host violates a security restriction (such as when an applet tries to connect to a machine other than the machine from which it was loaded), an exception is thrown
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Socket (InetAddress address, int port, InetAddress localAddress int localPort) throws javaioIOException, javalangSecurityException creates a socket connected to the specified
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address and port, and is bound to the specified local address and local port By default, a free port is used, but this method allows you to specify a specific port number, as well as a specific address, in the case of multihomed hosts (ie, a machine where the localhost is known by two or more IP addresses) protected Socket (SocketImpl implementation) creates an unconnected socket using the specified socket implementation Developers should not normally use this method, as it does not allow a hostname or port to be specified Socket (String host, int port) throws
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javanetUnknownHostException, javaioIOException, javalangSecurityException creates a socket connected to the specified host
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and port This method allows a string to be specified, rather than an InetAddress If the hostname could not be resolved, a connection could not be established, or a security restriction is violated, an exception is thrown
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Socket (String host, int port, InetAddress localAddress, int localPort) throws javanetUnknownHostException, javaio IOException, javalangSecurityException creates a socket connected to
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the specified host and port, and bound to the specified local port and address This allows a hostname to be specified as a string, and not an InetAddress instance, as well as allowing a specific local address and port to be bound to These local parameters are useful for multihomed hosts (ie, a machine where the localhost is known by two or more IP addresses) If the hostname can't be resolved, a connection cannot be established, or a security restriction is violated, an exception is thrown
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641 Creating a Socket
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Under normal circumstances, a socket is connected to a machine and port when it is created Although there is a blank constructor that does not require a hostname or port, it is protected and can't be called from normal applications Furthermore, there isn't a connect() method that allows you to specify these details at a later point in time, so under normal circumstances the socket will be connected when created If the network is fine, the call to a socket constructor will return as soon as a connection is established, but if the remote machine is not responding, the constructor method may block for an indefinite amount of time This varies from system to system, depending on a variety of factors such as the operating system being used and the default network timeout (some machines on a local intranet, for example, seem to respond faster than some Internet machines, depending on network settings) You can't ever guarantee how long a socket may block for, but this is abnormal behavior and won't happen frequently Nonetheless, in mission-critical systems it may be appropriate to place such calls in a second thread, to prevent an application from stalling NOTE At a lower level, sockets are produced by a socket factory, which is a special class responsible for creating the appropriate socket implementation Under normal circumstances, a standard javanetSocket will be produced, but in special situations, such as special networking environments in which custom sockets are used (for example, to break through a firewall by using a special proxy server), socket factories may actually return a socket subclass The details of socket factories are best left to experienced developers who are familiar with the intricacies of Java networking and have a definite purpose for creating custom sockets and socket factories For more information on this topic, consult the Java API documentation for the javanetSocketFactory and javanetSocketImplFactory class
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