CS 335/535 Web Programming - Java Network Programming

java.net Classes

• ContentHandler - converts data from a URLConnection to an object [invoked from URL.getContent() and URConnection.getContent()]
• DatagramPacket - encapsulates a datagram packet
  1. DatagramPacket (byte packetData[], int packetLength, inetAddress internetAddress, int port)
• DatagramSocket - encapsulates a datagram socket
  1. DatagramSocket (int port)
• InetAddress - encapsulates Internet addresses; used to info such as host name and port address
  1. equals - returns true if this InetAddress has the same Internet address as the parameter
  2. getAddress - returns the raw IP address in network byte order
  3. getAllByName - returns an array of all InetAddress objects for the given hostName
  4. getByName - returns an InetAddress object for the given hostName
  5. getHostName - returns the host name for this InetAddress
  6. getLocalHost - returns an InetAddress for the local host
  7. toString - returns a String showing the IP address for this InetAddress
• ServerSocket - encapsulates a server socket [must use SocketImpl to implement the actual Socket operation policies]
  1. ServerSocket(int port[, int time])
• Socket - encapsulates a client socket [must use SocketImpl to implement the actual Socket operation policies]
  1. Socket(String hostName, int port[ boolean isStream])
  2. Socket(InetAddress address, int port[ boolean isStream])
• SocketImpl - implements the actual socket operation policies for Socket and ServerSocket classes
• URL - encapsulates a Uniform Resource Locator [once the object has been created, its fields cannot be changed]
  1. URL ([URL context,] String urlSpec)
  2. URL (String protocol, String host, [int port,] String file)
  3. URLRequestor
• URLConnection - encapsulates an active connection to an object represented by a URL
  1. URLConnection(URL url) protected
• URLEncoder - changes Strings of text into an x-www-form-url encoded format
• URLStreamHandler - encapsulates URL stream openeres

Examples (The class files for those examples which are not applets, can also found in the share drive network programming on Jaring) [these all require the Java compiler to run]

1. Manipulating URLs - SiteSelector
2. Using a URL Stream Connection - Reading a File on a Server
3. Communicating with CGI Programs Through GET - calling a Lycos search engine
4. URL Requestor
5. Look for open ports
6. finger
7. Client - Server Using Stream Sockets
8. TicTacToe game: server & client

NetTools (written in Java)