The sender
public class my implements Runnable {
private DatagramSocket client ;
private BufferedReader reader;
private String toip; //对方的ip
private int toport; //对方的端口
public my(int port,String toip,int toport)
{
try {
client=new DatagramSocket(port);
reader=new BufferedReader(new InputStreamReader(System.in));
this.toip=toip;
this.toport=toport;
} catch (SocketException e) {
e.printStackTrace();
}
}
public void run()
{
while(true)
{
String s;
try {
s = reader.readLine();
byte[] datas=s.getBytes();
DatagramPacket packet=new DatagramPacket(datas,0,datas.length,new InetSocketAddress(this.toip,this.toport));
client.send(packet);
if(s.equals("bye"))
{
break;
}
} catch (IOException e) {
e.printStackTrace();
}
}
client.close();
}
}Receiving end: an object-oriented package
public class you implements Runnable{
private DatagramSocket server;
private int port;
private String from;
public you(int port,String from)
{
this.port=port;
this.from=from;
try {
server=new DatagramSocket(port);
} catch (SocketException e) {
e.printStackTrace();
}
}
public void run()
{
while(true)
{
byte[] container=new byte[1024*60];
DatagramPacket packet=new DatagramPacket(container,0,container.length);
try {
server.receive(packet);
byte[] datas=packet.getData();
int len=packet.getLength();
String data=new String(datas,0,datas.length);
System.out.println(from+":"+data);
if(data.equals("bye"))
{
break;
}
} catch (IOException e) {
e.printStackTrace();
}
}
server.close();
}
}Adding multithreading to achieve two-way communication
public class student {
public static void main(String[]args)
{
new Thread(new my(9999,"localhost",8888)).start();//发送
new Thread(new you(7777,"杜雨龙大帅比")).start(); //接收
}
}
public class teacher {
public static void main(String[]args)
{
new Thread(new you(8888,"雷建国")).start();//接收
new Thread(new my(5555,"localhost",7777) ).start();//发送
}
}