Java课件_LESSON 11 - Networks.pptVIP

LESSON 11: Networking 吴砥 wudi@ Department of Electronics Information Engineering, Huazhong University of Science Technology, Wuhan, P.R.C. The eight core packages of Java java.awt java.awt.event java.io java.sql java.util java.lang java.applet Outline Computer Networks The package Computer Networks The types of computer networks LAN Local Area Network MAN Metropolitan Area Network WAN Wide Area Network Internet WWW There is much excitement over the Internet and the World Wide Web. The Internet ties the “information world” together. The World Wide Web makes the Internet easy to use and gives it the flair and sizzle of multimedia. Organizations see the Internet and the Web as crucial to their information-systems strategies. Communicate Repeater Bridge Router Gateway Switch Circuit Switching Message Switching Packet Switching Datagram Virtual circuit ISO OSI Open System Interconnect Reference Model Application layer Presentation layer Session layer Transport layer Network layer Data Link layer Physical layer Communication between two nodes The architecture of Internet Four layers are included in TCP/IP reference model Application layer HTTP, HTTPS, FTP, TELNET, SMTP, DNS, SNMP Transport layer TCP, UDP Internet layer IP(IPv4, IPv6) Link layer Ethernet, Token Ring, FDDI, PPP, X.25, ATM, SDH URL, URI URN URI (Uniform Resource Identification) URL (Uniform Resource Location) URN (Uniform Resource Naming) Java Computer Networks Java provides a number of built-in networking capabilities that make it easy to develop Internet-based and Web-based applications. Not only can Java specify parallelism through multithreading, but it can enable programs to search the world for information and to collaborate with programs running on other computers internationally, nationally or just within an organization. The Package Introduction to the package Java’s networking capabilities are grouped into several packages. The fundamental networking capabilities are defined by cla