網絡編程案例

一，概念

1，網絡編程不等于網站編程

2，編程只和傳輸層打交道，即TCP和UDP兩個協議

二，案例

1，TCP實現點對點的聊天

Server端：兩個輸入流：讀客戶端和控制臺，一個輸出端：輸出客戶端

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public class ChatServer {public static void main(String[] args) {try {ServerSocket serverSocket=new ServerSocket(44432);Socket socket=serverSocket.accept();//獲取客戶端的連接信息BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(socket.getInputStream()));//client 的輸入內容PrintWriter printWriter =new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));//往client輸出內容System.out.println("client say:"+bufferedReader.readLine());Scanner bufferedReader1=new Scanner(System.in);//控制臺輸入內容String message=bufferedReader1.next();while(!message.equals("end")) {printWriter.println(message);//send message to client printWriter.flush();System.out.println("client say:"+bufferedReader.readLine());// get message from clientmessage=bufferedReader1.next();}bufferedReader.close();printWriter.close();bufferedReader1.close();} catch (IOException e) {e.printStackTrace();}} }

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Client端：兩個輸入流：讀服務端和控制臺，一個輸出端：輸出服務端

public class ChatClient {public static void main(String[] args) {try {Socket socket=new Socket("127.0.0.1",44432);//獲取服務端的唯一標識PrintWriter printWriter=new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));//BufferedWriter流也可以BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(socket.getInputStream()));BufferedReader bufferedReader1=new BufferedReader(new InputStreamReader(System.in));String message=bufferedReader1.readLine();while (!message.equals("end")){printWriter.write(message+"\r\n");//加\r\n,因為讀取時是用readLine方式 ，等同于println方式printWriter.flush();//必須flush,不然另一端讀不到。。。System.out.println("server say:"+bufferedReader.readLine());message=bufferedReader1.readLine();}bufferedReader.close();bufferedReader1.close();} catch (IOException e) {e.printStackTrace();}} }

2，UDP 實現高精度數字傳輸 ? 通過數據報形式

接收端：

public class UdpServer {public static void main(String[] args) {byte[] buf=new byte[1024];//存儲接受數據報的容器DatagramPacket datagramPacket=new DatagramPacket(buf,buf.length);//數據報內容寫入容器try {DatagramSocket datagramSocket=new DatagramSocket(44423);while (true){datagramSocket.receive(datagramPacket);//接收發送方的數據報ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(buf);DataInputStream dataInputStream=new DataInputStream(byteArrayInputStream);System.out.println("clint say:"+dataInputStream.readDouble());}} catch (Exception e) {e.printStackTrace();}} }

發送端：

public class UdpClient {public static void main(String[] args) {double n=10000.00;try {ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();DataOutputStream dataOutputStream=new DataOutputStream(byteArrayOutputStream);dataOutputStream.writeDouble(n);//創建代有數據報內容和目的地址DatagramPacket datagramPacket=new DatagramPacket(byteArrayOutputStream.toByteArray(),byteArrayOutputStream.toByteArray().length,new InetSocketAddress("127.0.0.1",44423));DatagramSocket datagramSocket=new DatagramSocket(53421);//指定發送的端口 datagramSocket.send(datagramPacket);} catch (Exception e) {e.printStackTrace();}} }

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轉載于:https://www.cnblogs.com/ksWorld/p/6775202.html

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