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CIS225 – Advanced Java

CIS225 – Advanced Java. Networking. Overview. Introduction Client / Server Computing. Introduction. Networking is tightly integrated in Java Java provides socket-based communication A socket is an abstraction that facilitates client/server communication

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CIS225 – Advanced Java

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  1. CIS225 – Advanced Java Networking Y. Daniel Liang Introduction to Java Programming

  2. Overview • Introduction • Client / Server Computing Y. Daniel Liang Introduction to Java Programming

  3. Introduction • Networking is tightly integrated in Java • Java provides socket-based communication • A socket is an abstraction that facilitates client/server communication • Java treats socket communication using the same semantics as file I/O Y. Daniel Liang Introduction to Java Programming

  4. Introduction • Networking is tightly integrated in Java • Java provides socket-based communication • A socket is an abstraction that facilitates client/server communication • Java treats socket communication using the same semantics as file I/O Y. Daniel Liang Introduction to Java Programming

  5. Introduction (cont.) • Java supports stream and datagram sockets • Stream sockets use TCP (Transmission Control Protocol) for data transmission • Datagrams sockets use UDP (User Datagram Protocol) for data transmission Y. Daniel Liang Introduction to Java Programming

  6. Client / Server Computing • Network programming involves a server and one or more clients • The server is passive, it waits for connection requests from clients • Once a connection is made, they communicate via sockets • The server must be running when the client starts Y. Daniel Liang Introduction to Java Programming

  7. Client / Server Computing • To establish a server, you need to create a server socket and attach it to a port • The port is where the server listens for connections • The port identifies the TCP service on the socket • Port numbers between 0 and 1023 are reserved Socket s = new ServerSocket(port); Y. Daniel Liang Introduction to Java Programming

  8. Client / Server Computing • After a socket is created, the server listens for connections Socket clientCon = s.accept(); • The client then can issue a connection request • The client request can use either an IP address or a DNS name Socket serverCon = new Socket(“123.14.12.10”,8000); Y. Daniel Liang Introduction to Java Programming

  9. Client / Server Computing • After the server accepts the client connection request, I/O streams are used for communication • The getInputStream() and getOutputStream() methods are used to get streams on a socket InputStream fromServer = serverCon.getInputStream(); OutputStream toServer = serverCon.getInputStream(); Y. Daniel Liang Introduction to Java Programming

  10. Server Client Client int port = 8000; DataInputStream in; DataOutputStream out; ServerSocket server; Socket socket; server = new ServerSocket (port); socket = server.accept(); in = new DataInputStream (socket.getInputStream()); out = new DataOutputStream (socket.getOutputStream()); System.out.println(in.readDouble()); out.writeDouble(aNumber); int port = 8000; String host = “localhost”; DataInputStream in; DataOutputStream out; Socket socket; socket = new socket(host,8000) in = new DataInputStream (socket.getInputStream()); out = new DataOutputStream (socket.getOutputStream()); out.writeDouble(aNumber); System.out.println(in.readDouble()); Connection Request I/O Streams

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