ServerSocket类

布满荆棘的人生 2023-10-01 10:00 9阅读 0赞

package server;
    
    import java.io.*;
    import java.net.InetAddress;
    import java.net.ServerSocket;
    import java.net.Socket;
    import java.nio.charset.StandardCharsets;
    import java.util.Scanner;
    
    public class EchoServer {
        public static void main(String[] args) throws IOException {
            //1.
            ServerSocket serverSocket = new ServerSocket(8189);
            //2.阻塞，等待客户端连接
            System.out.println("等待客户端连接。。。");
            Socket socket = serverSocket.accept();
            InetAddress localHost = InetAddress.getLocalHost();
            System.out.println("客户端："+localHost+"已连接");
            //3.inputStream用于读取客户端的消息（请求），outputStream用于向客户端输出消息（响应）
            InputStream inputStream = socket.getInputStream();
            OutputStream outputStream = socket.getOutputStream();
            //4.读取输入流,将输入流转换成键盘输入
            Scanner scanner = new Scanner(inputStream, String.valueOf(StandardCharsets.UTF_8));
            //5.将输出流转换成打印流，在控制台输出
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream, StandardCharsets.UTF_8);
            PrintWriter printWriter = new PrintWriter(outputStreamWriter, true/*自动刷新*/);
            //6.向客户端发送消息，会输出到客户端终端设备上
            printWriter.println("Hello, Enter BYE to exit.");
            //7.scanner用于读取客户端的键盘输入，printWriter将scanner读取到的输入输出回显到客户端终端设备上
            boolean done = false;
            while(!done && scanner.hasNextLine()){
                String line = scanner.nextLine();
                printWriter.println("Echo: "+line);
                if("BYE".equals(line.trim())){
                    done = true;
                    System.out.println(localHost+"已退出");
                }
            }
    
    
        }
    }

运行EchoSever服务端，

在cmd终端输入telnet localhost 8981并回车，

就可以输入消息，并自动回显，输入BYE退出连接

![5e85f114fa0141a38691a3b46a09e8da.png][]

注：scanner用于读取客户端的键盘输入，printWriter将scanner读取到的输入输出回显到客户端终端设备上

[5e85f114fa0141a38691a3b46a09e8da.png]: https://img-blog.csdnimg.cn/5e85f114fa0141a38691a3b46a09e8da.png