Class java.net.DatagramPacket - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.net.DatagramPacket

java.lang.Object
   |
   +----java.net.DatagramPacket

public final class DatagramPacket
extends Object

This class represents a datagram packet.

Datagram packets are used to implement a connectionless packet delivery service. Each message is routed from one machine to another based solely on information contained within that packet. Multiple packets sent from one machine to another might be routed differently, and might arrive in any order.

DatagramPacket(byte[], int): Constructs a DatagramPacket for receiving packets of length ilength.
DatagramPacket(byte[], int, InetAddress, int): Constructs a datagram packet for sending packets of length ilength to the specified port number on the specified host.

getAddress(): Returns the IP address of the machine to which this datagram is being sent or from which the datagram was received.
getData(): Returns the data received or the data to be sent.
getLength(): Returns the length of the data to be sent or the length of the data received.
getPort(): Returns the port number on the remote host to which this datagram is being sent or from which the datagram was received.
setAddress(InetAddress)
setData(byte[])
setLength(int)
setPort(int)

DatagramPacket

 public DatagramPacket(byte ibuf[],
                       int ilength)

Constructs a DatagramPacket for receiving packets of length ilength.

The length argument must be less than or equal to ibuf.length.

Parameters:: ibuf - buffer for holding the incoming datagram.; ilength - the number of bytes to read.

DatagramPacket

 public DatagramPacket(byte ibuf[],
                       int ilength,
                       InetAddress iaddr,
                       int iport)

Constructs a datagram packet for sending packets of length ilength to the specified port number on the specified host. The length argument must be less than or equal to ibuf.length.

Parameters:: ibuf - the packet data.; ilength - the packet length.; iaddr - the destination address.; iport - the destination port number.
See Also:: InetAddress

getAddress

 public synchronized InetAddress getAddress()

Returns the IP address of the machine to which this datagram is being sent or from which the datagram was received.

Returns:: the IP address of the machine to which this datagram is being sent or from which the datagram was received.
See Also:: InetAddress

getPort

 public synchronized int getPort()

Returns the port number on the remote host to which this datagram is being sent or from which the datagram was received.

Returns:: the port number on the remote host to which this datagram is being sent or from which the datagram was received.

getData

 public synchronized byte[] getData()

Returns the data received or the data to be sent.

Returns:: the data received or the data to be sent.

getLength

 public synchronized int getLength()

Returns the length of the data to be sent or the length of the data received.

Returns:: the length of the data to be sent or the length of the data received.

setAddress

 public synchronized void setAddress(InetAddress iaddr)

setPort

 public synchronized void setPort(int iport)

setData

 public synchronized void setData(byte ibuf[])

setLength

 public synchronized void setLength(int ilength)

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