Socket编程之TCP/UDP

1: 

TCP编程(一对多):

服务器端:

 

package com.sqtoon.socket.tcp;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class TcpSocketServer {

	public static final int TCP_PORT = 8888;

	public static void main(String[] args) {
		ServerSocket serverSocket = null;
		try {
			serverSocket = new ServerSocket(TCP_PORT);
			System.out.println("启动服务器, 等待客户端连接...");
			while (true) {
				final Socket socket = serverSocket.accept();
				new Thread(new Runnable() {
					DataInputStream dataInputStream = null;
					DataOutputStream dataOutputStream = null;

					@Override
					public void run() {
						try {
							while (true) {
								dataInputStream = new DataInputStream(socket.getInputStream());
								String msg = dataInputStream.readUTF(); // 接收客户端消息
								System.out.println("接收到Client发送过来的消息: " + msg);
								dataOutputStream = new DataOutputStream(socket.getOutputStream());
								dataOutputStream.writeUTF("服务器已处理消息: " + msg); // 返回给客户端消息
							}
						} catch (Exception e) {
							e.printStackTrace();
						} finally {
							try {
								dataInputStream.close();
								dataOutputStream.close();
								socket.close();
							} catch (Exception e2) {
								e2.printStackTrace();
							}
						}
					}
				}).start();
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				serverSocket.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

}

 

客户端:

 

package com.sqtoon.socket.tcp;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.UUID;

public class TcpSocketClient {

	private static final String uuid = UUID.randomUUID().toString();

	public static void main(String[] args) {
		Socket socket = null;
		DataOutputStream dataOutputStream = null;
		DataInputStream dataInputStream = null;
		try {
			socket = new Socket("127.0.0.1", TcpSocketServer.TCP_PORT);

			while (true) {
				dataOutputStream = new DataOutputStream(socket.getOutputStream());

				dataOutputStream.writeUTF(uuid + "这是客户端发给服务器的消息..." + System.currentTimeMillis());

				dataInputStream = new DataInputStream(socket.getInputStream());

				String msg = dataInputStream.readUTF();

				System.out.println("接收服务器返回的消息: " + msg);

				Thread.sleep(1000 * 3);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				dataOutputStream.close();
				dataInputStream.close();
				socket.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

}

 

 

 

2:

UDP编程(一对一):

服务器端:

 

package com.sqtoon.socket.udp;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class UdpSocketServer {

	public static final int UDP_PORT = 6666;
	public static final String CHATSET = "UTF-8";

	public static void main(String[] args) {
		DatagramSocket datagramSocket = null;
		try {
			datagramSocket = new DatagramSocket(UDP_PORT);

			byte[] buf = new byte[0];

			DatagramPacket datagramPacket = new DatagramPacket(buf, buf.length);

			while (true) {
				buf = new byte[UdpSocketClient.BUF_LENGTH];
				datagramPacket.setData(buf);

				datagramSocket.receive(datagramPacket);

				String msg = new String(buf, CHATSET);
				System.out.println("接收到客户端发送的消息: " + msg);

				datagramPacket.setSocketAddress(new InetSocketAddress("127.0.0.1", 5555));
				datagramPacket.setData(("服务器处理的消息: " + msg).getBytes(CHATSET));

				datagramSocket.send(datagramPacket);

				datagramPacket.setData(buf);
			}

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			datagramSocket.close();
		}
	}

}

 

客户端:

package com.sqtoon.socket.udp;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class UdpSocketClient {

	public static final int UDP_PORT = 5555;
	public static final int BUF_LENGTH = 1024;

	public static void main(String[] args) {
		DatagramSocket datagramSocket = null;
		try {
			datagramSocket = new DatagramSocket(UDP_PORT);

			byte[] buf = new byte[0];
			DatagramPacket datagramPacket = new DatagramPacket(buf, buf.length);

			while (true) {
				buf = "客户端的消息".getBytes(UdpSocketServer.CHATSET);
				datagramPacket.setData(buf);

				datagramPacket.setSocketAddress(new InetSocketAddress("127.0.0.1", UdpSocketServer.UDP_PORT));

				datagramSocket.send(datagramPacket);

				buf = new byte[BUF_LENGTH];
				datagramPacket.setData(buf, 0, buf.length);

				datagramSocket.receive(datagramPacket);

				String msg = new String(buf, UdpSocketServer.CHATSET);

				System.out.println("接收到服务器端返回的消息: " + msg.length() + msg);

				Thread.sleep(1000 * 2);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			datagramSocket.close();
		}
	}
}