package liu.net.udp;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import javax.swing.plaf.synth.SynthSpinnerUI;
public class ChatUseUdp {
public static void main(String[] args) throws SocketException {
//通过 UDP+多线程 实现聊天功能
//通过UDP协议完成一个聊天程序。一个负责发送数据的任务。一个负责接收数据的任务。两个任务需要同时进行，用多线程技术
//创建socket服务
DatagramSocket send = new DatagramSocket(10006);
//此端口需要与发送端指定的端口一致，否则接收不到数据
DatagramSocket rece = new DatagramSocket(10007);
new Thread(new Send(send)).start();
new Thread(new Receive(rece)).start();
}
}
//实现发送数据的类
class Send implements Runnable {
private DatagramSocket ds;
public Send(DatagramSocket ds) {
super();
this.ds = ds;
}
public void run() {
//具体要发送数据的内容
//1.从键盘输入发送的数据
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
//读取数据
String line = null;
try{
while((line=bf.readLine())!=null){
//2.将数据封装到数据包中
byte[] buf = line.getBytes();
DatagramPacket dp = new DatagramPacket(buf,buf.length,
InetAddress.getByName("127.0.0.1"),10007);
//3.把数据发送出去
ds.send(dp);
if("over".equals(line)){
break;
}
}
ds.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
//实现接收数据的类
class Receive implements Runnable {
private DatagramSocket ds;
public Receive(DatagramSocket ds) {
super();
this.ds = ds;
}
public void run() {
while(true){
//接收的具体任务内容
//1.因为接收的数据最终都会存储到数据包中，而数据包中必须有字节数组
byte[] buf = new byte[1024];
//2.创建数据包对象
DatagramPacket dp = new DatagramPacket(buf,buf.length);
//3.将收到的数据存储到数据包中
try {
ds.receive(dp);
} catch (IOException e) {
e.printStackTrace();
}
//4.获取数据
String ip = dp.getAddress().getHostAddress();
String data = new String(dp.getData(),0,dp.getLength());
System.out.println(ip+":"+data);
if("over".equals(data)){
System.out.println(ip+":离开聊天室");
}
}
}
}