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Using Sockets in Java

Using Sockets in Java. TCP/IP. A protocol is a set of rules that determine how things communicate with each other The software which manages Internet communication follows a suite of protocols called TCP/IP

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Using Sockets in Java

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  1. Using Sockets in Java Davide Rossi 2002

  2. TCP/IP • A protocol is a set of rules that determine how things communicate with each other • The software which manages Internet communication follows a suite of protocols called TCP/IP • The Internet Protocol (IP) determines the format of the information as it is transferred • The Transmission Control Protocol (TCP) dictates how messages are reassembled and handles lost information Davide Rossi 2002

  3. IP • Internet Protocol: RFC 791 • Base protocol for data transmission • It is connectionless and unreliable • It is routable • Defines the addressing of the nodes using IP addresses Davide Rossi 2002

  4. IP and Internet Addresses • Each computer on the Internet has a unique IP address, such as: 130.136.1.110 • Most computers also have a unique Internet name, which also is referred to as an Internet address: www.cs.unibo.it • The first part indicates a particular computer (www) • The rest is the domain name, indicating the organization (cs.unibo.it) Davide Rossi 2002

  5. TCP • Transmission Control Protocol: RFC 793 • It’s a reliable connection-oriented protocol • Reliability is achieved using packets indexing and generating “ack” messages for each received packet Davide Rossi 2002

  6. TCP • Creating a connection is an asymmetrical process; once the connection is established the protocol becomes symmetric • Ports are used to initiate a connection Davide Rossi 2002

  7. Connection Sequence Server Client my.server.it FTP HTTP Web Browser POP http://my.server.it 23 110 80 Davide Rossi 2002

  8. TCP Standard Ports • Below 1024, assigned by the IANA Davide Rossi 2002

  9. TCP Connections in Java • The Socket class is used for handling TCP connections in Java • A socket can be used as a data source for a stream • The SocketServer class is used to establish a connection Davide Rossi 2002

  10. Waiting for a Connection ServerSocket ss =new ServerSocket(1234); Socket s = ss.accept(); Davide Rossi 2002

  11. Connecting to a Remote Host Socket s = new Socket(“my.host.it”, 1234); Davide Rossi 2002

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