网络编程

网络编程

1

import java.net.*;
import java.io.*;

public class TestServer {
	public static void main(String args[]) {
		try {		
			ServerSocket s = new ServerSocket(8888);
			while (true) {
				Socket s1 = s.accept();
				OutputStream os = s1.getOutputStream();
				DataOutputStream dos = new DataOutputStream(os);
				dos.writeUTF("Hello," + s1.getInetAddress() + 
						"port#" +s1.getPort() + "  bye-bye!");
				dos.close();
				s1.close();
			}
		}catch (IOException e) {
			e.printStackTrace();
			System.out.println("程序运行出错:" + e);			
		}
	}
}

 2

import java.net.*;
import java.io.*;

public class TestClient {
	public static void main(String args[]) {
		try {
			Socket s1 = new Socket("127.0.0.1", 8888);
			InputStream is = s1.getInputStream();
			DataInputStream dis = new DataInputStream(is);
			System.out.println(dis.readUTF());
			dis.close();
			s1.close();
		} catch (ConnectException connExc) {
			connExc.printStackTrace();
			System.err.println("服务器连接失败！");
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

 

3

package socket;

import java.net.*;
import java.io.*;

public class TestUDPServer
{
	public static void main(String args[]) throws Exception
	{
		byte buf[] = new byte[1024];
		DatagramPacket dp = new DatagramPacket(buf, buf.length);
		DatagramSocket ds = new DatagramSocket(5678);
		while(true)
		{
			ds.receive(dp);
			ByteArrayInputStream bais = new ByteArrayInputStream(buf);
			DataInputStream dis = new DataInputStream(bais);
			System.out.println(dis.readLong());
		}
	}
}

 

4

package socket;

import java.net.*;
import java.io.*;

public class TestUDPClient
{
	public static void main(String args[]) throws Exception
	{
		long n = 10000L;
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(baos);
		dos.writeLong(n);
		
		byte[] buf = baos.toByteArray();
		System.out.println(buf.length);
		
		DatagramPacket dp = new DatagramPacket(buf, buf.length, 
											   new InetSocketAddress("127.0.0.1", 5678)
											   );
		DatagramSocket ds = new DatagramSocket(9999);
		ds.send(dp);
		ds.close();
		
	}
}

 

5

网络异步编程