Java Socket编程最简单示例

/** *UDPServer *@author Winty wintys@gmail.com *@version 2008-12-15 */ import java.io.*; import java.net.*; class UDPServer{ public static void main(String[] args)throws IOException{ DatagramSocket server = new DatagramSocket(5050); byte[] recvBuf = new byte[100]; DatagramPacket recvPacket = new DatagramPacket(recvBuf , recvBuf.length); server.receive(recvPacket); String recvStr = new String(recvPacket.getData() , 0 , recvPacket.getLength()); System.out.println("Hello World!" + recvStr); int port = recvPacket.getPort(); InetAddress addr = recvPacket.getAddress(); String sendStr = "Hello ! I'm Server"; byte[] sendBuf; sendBuf = sendStr.getBytes(); DatagramPacket sendPacket = new DatagramPacket(sendBuf , sendBuf.length , addr , port ); server.send(sendPacket); server.close(); } }