JAVA一个简单的UDP实现

服务器端
package datagramSocket;


import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class UDP_DatagramSocket_Server {

static final int port=1700;//port
private byte[] buf=new byte[1000];
private DatagramPacket dp=new DatagramPacket(buf,buf.length);
private DatagramSocket socket;
public UDP_DatagramSocket_Server(){
try {
socket=new DatagramSocket(port);
System.out.println("Socket started:");
while(true){
socket.receive(dp);//阻塞等待信息的输入
String receiveWord=new String(dp.getData(),0,dp.getLength());
System.out.println("what have received is: "+receiveWord);
}
} catch (SocketException e) {
System.err.println("Can't open socket!");
System.exit(1);
}catch(IOException e){
System.err.println("Communication error!");
e.printStackTrace();
}
}
public static void main(String[] args) {
new UDP_DatagramSocket_Server();

}

}

客户端部分

package datagramSocket;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Scanner;

public class UDP_DatagramSocket_Client {

	private DatagramSocket s;
	private InetAddress hostAddress;
	public UDP_DatagramSocket_Client(){
		try {
			s=new DatagramSocket();
			hostAddress=InetAddress.getByName("localhost");
			System.out.println("Please enter what you want to send: ");
			Scanner scanner=new Scanner(System.in);
			String mes=scanner.next();
			s.send(new DatagramPacket(mes.getBytes(),mes.length(),hostAddress,1700));
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	public static void main(String[] args) {
		new UDP_DatagramSocket_Client();

	}

}

下一步是在此代码的基础之上实现基于TCP的文件传输