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The Java Library
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protocols Many of these will seem familiar to you if you have spent any time surfing the Internet Port number 21 is for FTP; 23 is for Telnet; 25 is for e-mail; 43 is for whois; 79 is for finger; 80 is for HTTP; 119 is for netnews and the list goes on It is up to each protocol to determine how a client should interact with the port For example, HTTP is the protocol that web browsers and servers use to transfer hypertext pages and images It is a quite simple protocol for a basic page-browsing web server Here s how it works When a client requests a file from an HTTP server, an action known as a hit, it simply sends the name of the file in a special format to a predefined port and reads back the contents of the file The server also responds with a status code to tell the client whether or not the request can be fulfilled and why A key component of the Internet is the address Every computer on the Internet has one An Internet address is a number that uniquely identifies each computer on the Net Originally, all Internet addresses consisted of 32-bit values, organized as four 8-bit values This address type was specified by IPv4 (Internet Protocol, version 4) However, a new addressing scheme, called IPv6 (Internet Protocol, version 6) has come into play IPv6 uses a 128-bit value to represent an address, organized into eight 16-bit chunks Although there are several reasons for and advantages to IPv6, the main one is that it supports a much larger address space than does IPv4 To provide backward compatibility with IPv4, the low-order 32 bits of an IPv6 address can contain a valid IPv4 address Thus, IPv4 is upwardly compatible with IPv6 Fortunately, when using Java, you won t normally need to worry about whether IPv4 or IPv6 addresses are used because Java handles the details for you Just as the numbers of an IP address describe a network hierarchy, the name of an Internet address, called its domain name, describes a machine s location in a name space For example, wwwosbornecom is in the COM domain (reserved for US commercial sites); it is called osborne (after the company name), and www identifies the server for web requests An Internet domain name is mapped to an IP address by the Domain Naming Service (DNS) This enables users to work with domain names, but the Internet operates on IP addresses
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The Networking Classes and Interfaces
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Java supports TCP/IP both by extending the already established stream I/O interface introduced in 19 and by adding the features required to build I/O objects across the network Java supports both the TCP and UDP protocol families TCP is used for reliable stream-based I/O across the network UDP supports a simpler, hence faster, point-to-point datagram-oriented model The classes contained in the javanet package are shown here:
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Authenticator CacheRequest CacheResponse ContentHandler CookieHandler Inet6Address InetAddress InetSocketAddress ServerSocket Socket SocketAddress
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InterfaceAddress (Added by SocketImpl Java SE 6) JarURLConnection SocketPermission URI URL
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CookieManager (Added by MulticastSocket Java SE 6) DatagramPacket NetPermission
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20:
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Networking
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DatagramSocket DatagramSocketImpl HttpCookie (Added by Java SE 6) HttpURLConnection
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NetworkInterface PasswordAuthentication Proxy ProxySelector
URLClassLoader URLConnection URLDecoder URLEncoder URLStreamHandler
IDN (Added by Java SE 6) ResponseCache Inet4Address SecureCacheResponse
The javanet package s interfaces are listed here:
ContentHandlerFactory CookiePolicy (Added by Java SE 6) CookieStore (Added by Java SE 6) DatagramSocketImplFactory SocketOptions FileNameMap SocketImplFactory URLStreamHandlerFactory
In the sections that follow, we will examine the main networking classes and show several examples that apply to them Once you understand these core networking classes, you will be able to easily explore the others on your own
InetAddress
The InetAddress class is used to encapsulate both the numerical IP address and the domain name for that address You interact with this class by using the name of an IP host, which is more convenient and understandable than its IP address The InetAddress class hides the number inside InetAddress can handle both IPv4 and IPv6 addresses
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