JAVA网络编程Socket

EchoServer

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class EchoServer {
    private int port = 8000;
    private ServerSocket serverSocket;

    public EchoServer() throws IOException {
        serverSocket = new ServerSocket(port);
        System.out.println("服务器启动");
    }

    public String echo(String msg) {
        return "echo:" + msg;
    }

    private PrintWriter getWriter(Socket socket) throws IOException {
        OutputStream outputStream = socket.getOutputStream();
        return new PrintWriter(outputStream, true);
    }

    private BufferedReader getReader(Socket socket) throws IOException {
        InputStream inputStream = socket.getInputStream();
        return new BufferedReader(new InputStreamReader(inputStream));
    }

    public void Service() {
        while (true) {
            Socket socket = null;
            try {
                socket = serverSocket.accept();
                System.out.println("新客户端接入" + socket.getInetAddress() + ":" + socket.getPort());
                BufferedReader br = getReader(socket);
                PrintWriter pw = getWriter(socket);
                String msg = null;
                while ((msg = br.readLine()) != null) {
                    System.out.println(msg);
                    pw.println(echo(msg));
                    if (msg.equals("bye")) {
                        break;
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (socket != null) socket.close();

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static void main(String[] args) throws IOException {
        new EchoServer().Service();
    }
}

EchoClient

import java.io.*;
import java.net.Socket;

public class EchoClient {
    private String host = "localhost";
    private int port = 8000;
    private Socket socket;

    public EchoClient() throws IOException {
        socket = new Socket(host, port);
    }

    public static void main(String[] args) throws IOException {
        new EchoClient().talk();
    }

    private PrintWriter getWriter(Socket socket) throws IOException {
        OutputStream outputStream = socket.getOutputStream();
        return new PrintWriter(outputStream, true);
    }

    private BufferedReader getReader(Socket socket) throws IOException {
        InputStream inputStream = socket.getInputStream();
        return new BufferedReader(new InputStreamReader(inputStream));
    }

    public void talk() {
        try {
            BufferedReader br = getReader(socket);
            PrintWriter pw = getWriter(socket);
            BufferedReader localReader = new BufferedReader(new InputStreamReader(System.in));
            String msg = null;
            while ((msg = localReader.readLine()) != null) {
                pw.println(msg);
                System.out.println(br.readLine());
                if (msg.equals("bye")) {
                    break;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (socket != null) socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}