基於TCP的Socket實現和基於UDP的Socket實現

一、基於TCP的socket實現

三次握手，有連接的，可靠地，數據大的
主要用到的類：Socket （客戶端和服務端都需要）,ServerSocket(服務端用)

1. Server端代碼示例：

 public class Server {
	static int port = 1000; 
	/**
	 * @param args
	 */
	public static void main(String[] args) { 
		/*
		 * 創建服務器端的對象ServerSocket
		 * 監聽Socket連接
		 * 通過返回的os流
		 */
		ServerSocket server = null;
		try {
			server = new ServerSocket(port);			
			Socket socket = server.accept(); //返回client方的socket對象			
			InputStream is = socket.getInputStream();			
			byte[] b = new byte[1024];
			int len = 0;
			while((len = is.read(b))!=-1){
				String inputContent = new String(b,0,len);
				System.out.println("received:"+inputContent);
			} 
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{ 
		} 
	}
}

2. Client端代碼示例：

public class Client {
	static String ip =  "192.xxx.xx.xxx"; 
	static int port = 1000;	 
	/**
	 * @param args
	 */
	public static void main(String[] args) {
	/*
		 * 1. 創建一個客戶端的socket對象
		 * 2. 建立連接
		 * 3. 通過io流在管道內傳輸數據
		 * 4. 關閉socket
		 */
		Socket client =null;
		try {
			client = new Socket(ip,port);			
			OutputStream os = client.getOutputStream();			
			os.write("tcp".getBytes());			
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(client !=null){
				try {
					client.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		} 
	} 
}

基於UDP的socket實現：

無連接，不可靠的：

基於UDP的Server端代碼：

public class ReceiveClass {

	/**
	 * @param args
	 */
	public static void main(String[] args) { 
//		1. 創建UDP協議對象 DatagramSocket ds = new ;
//		2. 打包64k內的數據 DatagrapPacket dp = new ;
//		3. 接收
		DatagramSocket ds = null;
		try {
			ds = new DatagramSocket(9999); 
			byte[] buf = new byte[1024]; 
			DatagramPacket dp = new DatagramPacket(buf,buf.length);
			ds.receive(dp);//阻塞方法
			byte[] b = dp.getData();
			System.out.println("received data="+new String(b,0,dp.getLength()).trim()); 
		} catch (SocketException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
	}
}

基於UDP的Client端代碼：

public class SendClass {
 
	/**
	 * @param args
	 */
	public static void main(String[] args) { 
		try {
			DatagramSocket ds = new DatagramSocket() ;			
			byte[] buf = "I am send data".getBytes();
			InetAddress  inetAddress = InetAddress.getByName("XXX.XXX.86.XXX");
			DatagramPacket dp = new DatagramPacket(buf,0,buf.length,inetAddress, 9999);			
			ds.send(dp);
			System.out.println("send data="+buf);
		} catch (SocketException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
	} 
}