Question

我正在编写服务器 - 客户端聊天程序。

这是我的代码

SERVER：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class HelloServer {

    public final static int defaultPort = 2345;

    public static void main(String[] args) {
        int port = defaultPort;
        try {
            port = Integer.parseInt(args[0]);
        } catch (Exception e) {
        }
        if (port <= 0 || port >= 65536) {
            port = defaultPort;
        }
        try {
            ServerSocket ss = new ServerSocket(port);

            while (true) {
                try {
                    Socket s = ss.accept();

                    String response = "Hello " + s.getInetAddress() + " on port " + s.getPort()
                            + "\r\n";
                    response += "This is " + s.getLocalAddress() + " on port " + s.getLocalPort()
                            + "\r\n";
                    OutputStream out = s.getOutputStream();
                    out.write(response.getBytes());
                    System.out.write(response.getBytes());
                    InputStream in = s.getInputStream();

                    System.out.println("from client");
                    int z = 0;
                    while ((z = in.read()) != -1) {
                        System.out.write(z);
                    }

                } catch (IOException e) {
                }
            }
        } catch (IOException e) {
            System.err.println(e);
        }
    }
}

客户端：

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

public class SocketGetINetAdd {

    public static void main(String[] args) throws UnknownHostException, IOException {
        Socket socket = new Socket("192.xxx.x.xxx", 2345);
        InetAddress inetAddress = socket.getInetAddress();

        System.out.println("Connected to:: " + inetAddress.getHostName() + " Local address:: "
                + socket.getLocalAddress() + " Local Port:: " + socket.getLocalPort());
        BufferedInputStream bfINPUT = new BufferedInputStream(socket.getInputStream());
        int b = 0;
        OutputStream os = System.out;
        while ((b = bfINPUT.read()) != -1) {
            os.write(b);
        }
        OutputStream osNew = socket.getOutputStream();
        String s = "This Is The Client"; // data to be sent
        osNew.write(s.getBytes());
        os.write(s.getBytes());

}

我通过我的程序将它们联系起来。

但现在我想知道如何从客户端将一些数据发送回服务器？

客户端的代码（用于向服务器发送数据）以及用于显示从控制台（服务器）上的客户端接收的数据的服务器的代码是什么？

P.S-我是网络编程的新手。请不要批评我的编码风格：P

Answer 1

使用服务器流

OutputStream os = socket.getOutputStream();

而不是客户端控制台输出流

OutputStream os = System.out;

在客户端写回服务器。

并且在服务器端使用客户端流以相同的方式从客户端读取。

InputStream in = s.getInputStream();

我已经在server-client communication上发布了示例代码。阅读它是为了你的学习。

Answer 2

你需要线程。此示例中的客户端读取System.in中的行并将该行发送到服务器。服务器发送回声。

在您的实际应用程序中，您必须查看编码

服务器

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.ServerSocket; import java.net.Socket; public class HelloServer { public final static int defaultPort = 2345; public static void main(String[] args) { int port = defaultPort; try { port = Integer.parseInt(args[0]); } catch (Exception e) { } if (port <= 0 || port >= 65536) { port = defaultPort; } try { ServerSocket ss = new ServerSocket(port); while (true) { try { Socket s = ss.accept(); new SocketThread(s).start(); } catch (IOException e) { } } } catch (IOException e) { System.err.println(e); } } public static class SocketThread extends Thread { private Socket s; public SocketThread(Socket s) { this.s = s; } @Override public void run() { try { String response = "Hello " + s.getInetAddress() + " on port " + s.getPort() + "\r\n"; response += "This is " + s.getLocalAddress() + " on port " + s.getLocalPort() + "\r\n"; OutputStream out = s.getOutputStream(); out.write(response.getBytes()); BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream())); while (true) { String line = input.readLine(); System.out.println("IN: " + line); s.getOutputStream().write(("ECHO " + line + "\n").getBytes()); s.getOutputStream().flush(); System.out.println(line); } } catch (IOException e) { System.err.println(e); } } } }

<强>客户端

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.InetAddress; import java.net.Socket; import java.net.UnknownHostException; public class SocketGetINetAdd { public static void main(String[] args) throws UnknownHostException, IOException { Socket socket = new Socket("localhost", 2345); InetAddress inetAddress = socket.getInetAddress(); System.out.println("Connected to:: " + inetAddress.getHostName() + " Local address:: " + socket.getLocalAddress() + " Local Port:: " + socket.getLocalPort()); new OutputThread(socket.getInputStream()).start(); InputStreamReader consoleReader = new InputStreamReader(System.in); BufferedReader in = new BufferedReader(consoleReader); while (true) { String inline = in.readLine(); if (inline.equals("by")) { break; } inline += "\n"; socket.getOutputStream().write(inline.getBytes()); socket.getOutputStream().flush(); } } public static class OutputThread extends Thread { private InputStream inputstream; public OutputThread(InputStream inputstream) { this.inputstream = inputstream; } @Override public void run() { BufferedReader input = new BufferedReader(new InputStreamReader(inputstream)); while (true) { try { String line = input.readLine(); System.out.println(line); } catch (IOException exception) { exception.printStackTrace(); break; } } } } }

服务器 - 客户端聊天程序

2 个答案: