Java中Socket用法詳解

public class SocketClient {
	
	public static void main(String[] args) throws InterruptedException {
		try {
			// 和服務器創建連接
			Socket socket = new Socket("localhost",8088);
			
			// 要發送給服務器的信息
			OutputStream os = socket.getOutputStream();
			PrintWriter pw = new PrintWriter(os);
			pw.write("客戶端發送信息");
			pw.flush();
			
			socket.shutdownOutput();
			
			// 從服務器接收的信息
			InputStream is = socket.getInputStream();
			BufferedReader br = new BufferedReader(new InputStreamReader(is));
			String info = null;
			while((info = br.readLine())!=null){
				System.out.println("我是客戶端，服務器返回信息："+info);
			}
			
			br.close();
			is.close();
			os.close();
			pw.close();
			socket.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
}

public class SocketServer {
	
	public static void main(String[] args) {
		try {
			// 創建服務端socket
			ServerSocket serverSocket = new ServerSocket(8088);
			
			// 創建客戶端socket
			Socket socket = new Socket();	
			
			//循環監聽等待客戶端的連接
            while(true){
            	// 監聽客戶端
            	socket = serverSocket.accept();
            	
            	ServerThread thread = new ServerThread(socket);
            	thread.start();
            	
            	InetAddress address=socket.getInetAddress();
                System.out.println("當前客戶端的IP："+address.getHostAddress());
            }
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
	}
 
}

public class ServerThread extends Thread{
	
	private Socket socket = null;
	
	public ServerThread(Socket socket) {
		this.socket = socket;
	}
 
	@Override
	public void run() {
		InputStream is=null;
        InputStreamReader isr=null;
        BufferedReader br=null;
        OutputStream os=null;
        PrintWriter pw=null;
        try {
			is = socket.getInputStream();
			isr = new InputStreamReader(is);
			br = new BufferedReader(isr);
			
			String info = null;
			
			while((info=br.readLine())!=null){
				System.out.println("我是服務器，客戶端說："+info);
			}
			socket.shutdownInput();
			
			os = socket.getOutputStream();
			pw = new PrintWriter(os);
			pw.write("服務器歡迎你");
			
			pw.flush();
        } catch (Exception e) {
			// TODO: handle exception
		} finally{
			//關閉資源
            try {
                if(pw!=null)
                    pw.close();
                if(os!=null)
                    os.close();
                if(br!=null)
                    br.close();
                if(isr!=null)
                    isr.close();
                if(is!=null)
                    is.close();
                if(socket!=null)
                    socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
		}
	}
 
}

public class SocketClient {
	
	public static void main(String[] args) {
		try {
            // 要發送的消息
            String sendMsg = "客戶端發送的消息";
            
            // 獲取服務器的地址
            InetAddress addr = InetAddress.getByName("localhost");
            
            // 創建packet包對象，封裝要發送的包數據和服務器地址和端口號
            DatagramPacket packet = new DatagramPacket(sendMsg.getBytes(),
            		sendMsg.getBytes().length, addr, 8088); 
            
            // 創建Socket對象
            DatagramSocket socket = new DatagramSocket();
            
            // 發送消息到服務器
            socket.send(packet);
 
            // 關閉socket
            socket.close();
            
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
	}
}

public class SocketServer {
	
	public static void main(String[] args) {
		try {
			 // 要接收的報文
			byte[] bytes = new byte[1024];
			DatagramPacket packet = new DatagramPacket(bytes, bytes.length);
			
			// 創建socket並指定端口
			DatagramSocket socket = new DatagramSocket(8088);
			
			// 接收socket客戶端發送的數據。如果未收到會一致阻塞
			socket.receive(packet);
			String receiveMsg = new String(packet.getData(),0,packet.getLength());
			System.out.println(packet.getLength());
			System.out.println(receiveMsg);
			
			// 關閉socket
			socket.close();
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
	}
 
}