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Published byLucy Dennis Modified over 8 years ago
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Networking with Java Socket programming
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The Interweb thing Al Gore invented… Internet is a network of networks. The Internet is really people communicating. Application layers 7, 6 : email, HTTP, FTP, Telnet, file 'sharing', streaming media, VoIP remote access: VPN Session layer 5: connections. e.g. sockets Transport layer 4: TCP, UDP Network layer 3: IP, the Internet Link layer 2, 1: NICs, device drivers, magic.
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Internet traffic 10% YouTube HTTP 36% other HTTP 37% P2P 17% newsgroups, streaming, gaming, VoIP In other words, mostly a waste of bits.
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Internet…what's it good for? For years there has been a theory that millions of monkeys typing at random on millions of typewriters would reproduce the entire works of Shakespeare… The Internet has proven this theory to be untrue. - Anonymous
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Socket Programming If a packet hits a pocket on a socket on a port, and the bus is interrupted as a very last resort, and the address of the memory makes your floppy disk abort, then the socket packet pocket has an error to report! fromfrom A Grandchild's Guide to Using Grandpa's Computer by Gene Ziegler
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Sockets programming a client exchanging data with a server An Internet socket is composed of the following:Internetsocket Protocol (TCP, UDP, raw IP) Protocol Local IP address (your computer)IP address Local port (your application)port Remote IP address (another computer) Remote port(another application)
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Server Sockets in Java package java.netjava.net ServerSocket server = new ServerSocket(PORT); // waits for network requests. ServerSocket Socket socket = server.accept(); // waits for a connection and returns a socket use java.io to exchange data InputStream from socket (client) OutputStream to socket (client)
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Client Sockets in Java package java.netjava.net Socket socket = new Socket ( host, port); // waits for a connection to host on a port and returns a socket Socket use java.io to exchange data InputStream from socket (server) OutputStream to socket (server) see PortScanner.java
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URL and IP addresses URL class represents a Uniform Resource Locator, a pointer to a "resource" on the World Wide Web. see ReadURL.java InetAddress class represents an Internet Protocol (IP) address. used to find out who the socket is talking to. ServerSocket or Socket can.getInetAddress();
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Sockets Programming see EchoServer.java & EchoClient.java simple two-way communication EchoServerThread.java & EchoClient.java multi-threaded server to handle many sets of two-way communication
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