网络编程_UDP协议_聊天程序
发送端:(将数据源改为键盘录入)
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class UDPSendDemo { public static void main(String[] args) throws IOException { System.out.println("发送端启动......."); //1.udp的socket服务,使用DatagramSocket对象 DatagramSocket ds = new DatagramSocket(); //2.将要发送的数据封装到数据包中 //使用DatagramPacket将数据封装到该对象包中 BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in)); String line = null; while((line = bufr.readLine())!=null){ byte[] buf = line.getBytes(); DatagramPacket dp = new DatagramPacket(buf, buf.length, InetAddress.getByName("127.0.0.1"), 10000); ds.send(dp); if("over".equals(line)) break; } ds.close(); } }
接收端:
import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; public class UDPReceiveDemo { public static void main(String[] args) throws IOException { System.out.println("接收端启动......."); //1.建立udp socket服务 DatagramSocket ds = new DatagramSocket(10000); while(true){ //2.创建数据包 byte[] buf = new byte[1024]; DatagramPacket dp = new DatagramPacket(buf, buf.length); //3.使用接收方法将数据存储在数据包中 ds.receive(dp); //4.通过数据包对象的方法,解析其中的数据,比如:地址,端口,数据内容 String ip = dp.getAddress().getHostAddress(); int port = dp.getPort(); String text = new String(dp.getData(),0,dp.getLength()); System.out.println(ip+":"+port+":"+text); } //5.关闭资源 //ds.close(); } }
基于多线程的聊天程序:
Send.java
import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class Send implements Runnable { private DatagramSocket ds; public Send(DatagramSocket ds){ this.ds = ds; } @Override public void run() { try { BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in)); String line = null; while((line=bufr.readLine())!=null){ byte[] buf = line.getBytes(); DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName("192.168.1.255"),10001); ds.send(dp); if("886".equals(line)) break; } ds.close(); } catch (Exception e) { } } }
Rece.java
import java.net.DatagramPacket; import java.net.DatagramSocket; public class Rece implements Runnable { private DatagramSocket ds; public Rece(DatagramSocket ds) { this.ds = ds; } @Override public void run() { try { while (true) { // 2,创建数据包。 byte[] buf = new byte[1024]; DatagramPacket dp = new DatagramPacket(buf, buf.length); // 3,使用接收方法将数据存储到数据包中。 ds.receive(dp);// 阻塞式的。 // 4,通过数据包对象的方法,解析其中的数据,比如,地址,端口,数据内容。 String ip = dp.getAddress().getHostAddress(); int port = dp.getPort(); String text = new String(dp.getData(), 0, dp.getLength()); System.out.println(ip + "::" + text); if(text.equals("886")){ System.out.println(ip+"....退出聊天室"); } } } catch (Exception e) { } } }
ChatDemo.java
import java.io.IOException; import java.net.DatagramSocket; import java.net.SocketException; public class ChatDemo { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { DatagramSocket send = new DatagramSocket(); DatagramSocket rece = new DatagramSocket(10001); new Thread(new Send(send)).start(); new Thread(new Rece(rece)).start(); } }