Java网络编程:TCP和UDP
2012-10-16 14:34
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TCP:
UDP:
import java.net.ServerSocket; import java.net.Socket; import java.io.DataOutputStream; public class J_Server { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub try { ServerSocket server=new ServerSocket(5000); while(true) { Socket s=server.accept(); System.out.println("服务器端接收连接"); DataOutputStream dataOut=new DataOutputStream(s.getOutputStream()); dataOut.writeUTF("来自服务器端的问候"); dataOut.close(); s.close(); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
import java.net.Socket; import java.net.UnknownHostException; import java.io.DataInputStream; public class J_Client { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub try { Socket s=new Socket("localhost",5000); DataInputStream dataIn=new DataInputStream(s.getInputStream()); System.out.println("客户端接收:"+dataIn.readUTF()); dataIn.close(); s.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
UDP:
import java.net.DatagramSocket; import java.net.DatagramPacket; import java.net.SocketException; import java.net.InetAddress; public class J_UdpServer { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub DatagramSocket dSocket; DatagramPacket inPacket; DatagramPacket outPacket; InetAddress cAddr; int cPort; int count=0; try { dSocket=new DatagramSocket(8000); while(true) { count++; inPacket=new DatagramPacket(new byte[100],100); dSocket.receive(inPacket); //接收数据包,存入inPacket cAddr=inPacket.getAddress(); cPort=inPacket.getPort(); String s = new String(inPacket.getData(),0,inPacket.getData().length); System.out.println("第"+count+"台设备接入"); System.out.println("Message:"+s); System.out.println("ClientAddr:"+cAddr.getHostName()); System.out.println("ClientPort:"+cPort); String outData="returnback_"+String.valueOf(count); outPacket=new DatagramPacket(outData.getBytes(),outData.getBytes().length,cAddr,cPort); dSocket.send(outPacket); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
import java.net.DatagramSocket; import java.net.DatagramPacket; import java.net.SocketException; import java.net.InetAddress; public class J_UdpClient { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub DatagramSocket dSocket; DatagramPacket inPacket; DatagramPacket outPacket; InetAddress sAddr; try { dSocket=new DatagramSocket(); sAddr=InetAddress.getByName("localhost"); String outData="请求连接..."; outPacket=new DatagramPacket(outData.getBytes(),outData.getBytes().length,sAddr,8000); dSocket.send(outPacket); //发送数据包 inPacket=new DatagramPacket(new byte[100],100); dSocket.receive(inPacket); //接收数据包,存入inPacket String s = new String(inPacket.getData(),0,inPacket.getData().length); System.out.println("Message:"+s); System.out.println("ServerAddr:"+inPacket.getAddress().getHostName()); System.out.println("ServerPort:"+inPacket.getPort()); dSocket.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
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