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Section 15.12 Chapter Summary

Subsection 15.12.1 Technical Terms

Table 15.12.1.
busy waiting callback method client
client/server protocols domain name ethernet protocol
File Transfer Protocol (FTP) get HyperText Transfer Protocol (HTTP)
internet Internet Internetworking Protocol (IP)
Java Server Page (JSP) packet port
post protocol router
sandbox security model scriptlet server
servlet Simple Mail Transfer Protocol (SMTP) socket
trusted code Uniform Resource Locator (URL) World Wide Web (WWW)

Subsection 15.12.2 Summary of Important Points

  • An internet is a collection of two or more distinct networks joined by routers, which have the task of translating one network's language to the other's. The Internet is a network of networks that uses the Internet Protocol (IP) as the translation medium.

  • A protocol is a set of rules that controls the transfer of information between two computers in a network. The HyperText Transfer Protocol (HTTP) governs information exchange on the World Wide Web (WWW). The Simple Mail Transfer Protocol controls mail service on the Internet. The File Transfer Protocol (FTP) controls the transfer of files between Internet computers. The Domain Name System (DNS) governs the use of names on the Internet.

  • A client/server application is one that divides its task between a client, which requests service, and a server, which provides service. Many Internet applications and protocols are based on the client/server model.

  • Lower-level protocols, such as the ethernet protocol and token ring protocol, govern the transmission of data between computers on a single network. The Internet Protocol (IP) translates between such protocols.

  • A Uniform Resource Locator (URL) is a standard way of specifying addresses on the Internet. It consists of several parts separated by slashes and colons: method://host:port/path/file. The java.net.URL class is used to represent URLs.

  • Files of text or data (images, audio files) on the Internet or Web can be downloaded using the same InputStream s and OutputStream s as files located on a disk. To read or write a resource located on a network, you need to connect its URL to an input or output stream.

  • The java.awt.Toolkit class contains useful methods for downloading Image s into an application.

  • A socket is a two-way communication channel between two running programs on a network. The java.net.Socket class can be used to set up communication channels for client/server applications. The server process listens at a socket for requests from a client. The client process requests service from a server listening at a particular socket. Once a connection exists between client and server, input and output streams are used to read and write data over the socket.

Solutions 15.12.3 Solutions to Self-Study Exercises

15.2 An Overview of Networks
15.2.2 Internets

Self-Study Exercises
15.2.2.1. Matching Problem for Topologies.

15.2.3 Network Protocols
15.2.3.1 Application Protocols

Self-Study Exercise

15.2.4 Client/Server Applications

Self-Study Exercise

15.5 The SlideShow Application
15.5.5 The Timer Class

Self-Study Exercise
15.5.5.1. Create Your Own Slideshow.

15.6 The Real-Estate Application
15.6.11 Self-Study Exercise

Exercise 15.6.9. Create Your Own App.

15.9 Playing One Row Nim Over the Network
15.9.4 Self-Study Exercise

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