![InetAddress
0 Factory Methods
0 static InetAddress getLocalHost( )throws
UnknownHostException
0 static InetAddress getByName(String hostName) throws
UnknownHostException
0 static InetAddress[ ] getAllByName(String hostName)
throws UnknownHostException](https://image.slidesharecdn.com/unit-6-java-240417052104-a130cee4/85/Unit-6-java-basic-for-java-programing-pptx-5-320.jpg)
![DatagramPacket
0 Constructor:
0 DatagramPacket(byte data[ ], int size)
0 DatagramPacket(byte data[ ], int size, InetAddress
ipAddress, int port)](https://image.slidesharecdn.com/unit-6-java-240417052104-a130cee4/85/Unit-6-java-basic-for-java-programing-pptx-18-320.jpg)
Unit-6-java basic for java programing.pptx
- 2. Networking Basic 0 Java networking supports the concept of Socket. 0 Socket 0 Identifies an endpoint in a n/w. 0 Allows a single computer to serve many different type of information to many different client as well as server at once. 0 This is accomplished through port(numbered socket on a particular machine).
- 3. Networking Basic 0 Socket 0 Socket communication takes place via protocol 0IP 0 Low-level routing protocol 0 Breaks data into small packets and send them to an address across n/w 0 No guarantee to delivered. 0TCP 0 Higher level protocol 0 Manage packet robustly 0 Sort and retransmit them as necessary 0 Reliably transmit data 0UDP 0 Used directly to support fast ,connectionless , unreliable transport packets.
- 4. InetAddress 0 Encapsulate both the numerical IP Address and the domain name for the address. 0 Can handle IPv4 and IPv6 0 Factory Method 0 InetAddress class does not have visible constructor 0 To create an InetAddress object, you have to use one of the available factory methods.
- 5. InetAddress 0 Factory Methods 0 static InetAddress getLocalHost( )throws UnknownHostException 0 static InetAddress getByName(String hostName) throws UnknownHostException 0 static InetAddress[ ] getAllByName(String hostName) throws UnknownHostException
- 6. TCP/IP Sockets 0 Used to implement reliable, bidirectional, persistent, point-to-point stream based connection between hosts on the Internet. 0 There are two types of TCP sockets in Java; one is for servers and other is for clients. 0 The ServerSocket class is for server and Socket is for client. 0 The ServetSocket class is designed to be a “listener”, which waits for clients to connect before do anything.
- 7. TCP/IP Sockets 0 The Socket class is designed to connect to server sockets. 0 The creation of a Socket object implicitly established connection between client and server. 0 Note: There are no methods or constructors that explicitly expose the details of establishing that connection.
- 8. TCP/IP Sockets 0 There are two constructor used to create client socket: 0 Socket(String hostName, int port) throws UnknownHostException, IOException Creates a socket connected to the named host and port. 0 Socket(InetAddress ipAddress, int port) throws IOException Creates a socket using a pre existing InetAddress object and a port.
- 9. 0 There are three constructor used to create server socket: 0 ServerSocket(int port) throws IOException 0 Creates server socket on the specified port with a queue length of 50. 0 ServerSocket(int port, int maxQueue) throws IOException 0 Creates a server socket on the specified port with a maximum queue length of maxQueue. 0 ServerSocket(int port, int maxQueue, InetAddress localAddress) throws IOException 0 Creates a server socket on the specified port with a maximum queue length of maxQueue. On a multihomed host, localAddress specifies the IP address to which this socket binds.
- 10. URL 0 Uniform Resource Locator 0 Provide reasonably intelligible form to uniquely identify or address information on the Internet. 0 URLs are being every where at once every browser uses them to identify information on the Web. 0 Within Java’s network class library, the URL class provides a simple, concise (brief important information) API to access information across the Internet using URLs.
- 11. URL 0 A URL specification format is based on four components. 0 Here are two examples: http://www.osborne.com/ and http://www.osborne.com:80/index.htm. 0 The first is the protocol to use, separated from the rest of the locator by a colon (:). 0 Common protocols are HTTP, FTP, gopher. 0 The second component is the host name or IP address of the host to use. 0 The third component, the port number, is an optional parameter.
- 12. URL 0 The fourth part is the actual file path. 0Most HTTP servers will append a file named index.html or index.htm to URLs that refer directly to a directory resource. 0 Constructor: 0 URL(String urlSpecifier) throws MalformedURLException 0 URL(String protocolName, String hostName, int port, String path) throws MalformedURLException 0 URL(String protocolName, String hostName, String path) throws MalformedURLException 0 URL(URL urlObj, String urlSpecifier) throws MalformedURLException
- 13. URLConnection 0 URLConnection is a general-purpose class for accessing the attributes of a remote resource. 0 Once you make a connection to a remote server, you can use URLConnection to inspect the properties of the remote object before actually transporting it locally
- 14. HttpURLConnection 0 Java provides a subclass of URLConnection that provides support for HTTP connections. 0 We obtain an HttpURLConnection by calling openConnection( ) on a URL object, but we must cast the result to HttpURLConnection.
- 15. Datagrams 0 Datagram is basically an information but there is no guarantee of packet delivery. 0 Java implements datagrams on top of the UDP protocol by using two classes: 0 DatagramPacket 0 Is a message that can be sent or received. 0 If you send multiple packet, it may arrive in any order. 0 DatagramSocket 0 is the mechanism used to send or receive the DatagramPackets.
- 16. DatagramSocket 0 Represents a connection-less socket for sending and receiving datagram packet. 0 DatagramSocket defines four public constructors: 0 DatagramSocket( ) throws SocketException 0 DatagramSocket(int port) throws SocketException 0 DatagramSocket(int port, InetAddress ipAddress) throws SocketException 0 DatagramSocket(SocketAddress address) throws SocketException
- 17. DatagramSocket 0 Methods 0 void send(DatagramPacket packet) throws IOException 0 void receive(DatagramPacket packet) throws IOException
- 18. DatagramPacket 0 Constructor: 0 DatagramPacket(byte data[ ], int size) 0 DatagramPacket(byte data[ ], int size, InetAddress ipAddress, int port)