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NETWORKING EN JAVA CLASSES IN THE JDK...

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Patricio Ligista de Corazon
Patricio Ligista de Corazon

Java es un lenguaje de programación y una plataforma informática que fue comercializada por primera vez en 1995 por Sun Microsystem

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Ing. Geovanny Vega Villacís, MTC
NETWORKING CLASSES IN THE JDK Through the classes in java.net, Java programs can use TCP or UDP to communicate over the Internet. – The InetAddress, URL, URLConnection. – Socket, and ServerSocket classes all use TCP to communicate over the network. – The DatagramPacket, DatagramSocket, and MulticastSocket classes are for use with UDP
Accessing TCP/IP from Java is straightforward. The main functionality is in the following classes: – java.net.InetAddress : Represents an IP address (either IPv4 or IPv6) and has methods for performing DNS lookup (next slide). – java.net.Socket : Represents a TCP socket. – java.net.ServerSocket : Represents a server socket which is capable of waiting for
INETADDRESS • The InetAddress class is used to encapsulate both the numerical IP address and the domain name for that address. • We 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. Servers InteAddress have three main purposes:  Encapsulates an address  Performs name lookup (converting a host name into an IP address)  Performs reverse lookup (converting the address into a host name)
Factory Methods InetAddress • static InetAddress getLocalHost( ) throws UnknownHostException • static InetAddress getByName(String hostName) throws UnknownHostException • static InetAddress[ ] getAllByName(String hostName) throws UnknownHostException
Getter Methods ï‚— public boolean isMulticastAddress() ï‚— public String getHostName() ï‚— public byte[] getAddress() ï‚— public String getHostAddress()
Utility Methods ï‚— public int hashCode() ï‚— public boolean equals(Object o) ï‚— public String toString()
Clases útiles en comunicaciones con Sockets Socket ServerSocket DatagramSocket DatagramPacket MulticastSocket NetworkServer NetworkClient SocketImpl
Socket obtiene recursos IP import java.net.*; public class DireccionesIP{ String name; public String Nombre(){ // Obtiene nombre LocalHost try{ InetAddress address = InetAddress.getLocalHost(); name=address.getHostName();} catch (UnknownHostException e){name="Imposible determinar Nombre del Equipo";} return name; } public String IP(){ // Obtiene Dirección IP LocalHost try{ InetAddress address = InetAddress.getLocalHost(); name=address.getHostAddress();} catch (UnknownHostException e){name="Imposible determinar Nombre del Equipo";} return name; }

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NETWORKING EN JAVA CLASSES IN THE JDK...

  • 1. Ing. Geovanny Vega Villacís, MTC
  • 2. NETWORKING CLASSES IN THE JDK Through the classes in java.net, Java programs can use TCP or UDP to communicate over the Internet. – The InetAddress, URL, URLConnection. – Socket, and ServerSocket classes all use TCP to communicate over the network. – The DatagramPacket, DatagramSocket, and MulticastSocket classes are for use with UDP
  • 3. Accessing TCP/IP from Java is straightforward. The main functionality is in the following classes: – java.net.InetAddress : Represents an IP address (either IPv4 or IPv6) and has methods for performing DNS lookup (next slide). – java.net.Socket : Represents a TCP socket. – java.net.ServerSocket : Represents a server socket which is capable of waiting for
  • 4. INETADDRESS • The InetAddress class is used to encapsulate both the numerical IP address and the domain name for that address. • We 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. Servers InteAddress have three main purposes: ï‚— Encapsulates an address ï‚— Performs name lookup (converting a host name into an IP address) ï‚— Performs reverse lookup (converting the address into a host name)
  • 5. Factory Methods InetAddress • static InetAddress getLocalHost( ) throws UnknownHostException • static InetAddress getByName(String hostName) throws UnknownHostException • static InetAddress[ ] getAllByName(String hostName) throws UnknownHostException
  • 6. Getter Methods ï‚— public boolean isMulticastAddress() ï‚— public String getHostName() ï‚— public byte[] getAddress() ï‚— public String getHostAddress()
  • 7. Utility Methods ï‚— public int hashCode() ï‚— public boolean equals(Object o) ï‚— public String toString()
  • 8. Clases útiles en comunicaciones con Sockets Socket ServerSocket DatagramSocket DatagramPacket MulticastSocket NetworkServer NetworkClient SocketImpl
  • 9. Socket obtiene recursos IP import java.net.*; public class DireccionesIP{ String name; public String Nombre(){ // Obtiene nombre LocalHost try{ InetAddress address = InetAddress.getLocalHost(); name=address.getHostName();} catch (UnknownHostException e){name="Imposible determinar Nombre del Equipo";} return name; } public String IP(){ // Obtiene Dirección IP LocalHost try{ InetAddress address = InetAddress.getLocalHost(); name=address.getHostAddress();} catch (UnknownHostException e){name="Imposible determinar Nombre del Equipo";} return name; }