java - 来自客户端的字符串在 Java 中的 Client/Socket 应用程序中的 Socket 控制台上打印出来

Question

我正在尝试创建一个简单的客户端/服务器套接字应用程序。我遇到的问题是如何制作以及应该将其放在哪里，这部分将在客户端请求输入，然后在服务器端打印出相同的输入。我尝试过，但没有成功。

目标:在客户端类的控制台中，当用户输入例如“我的名字是迈克”时，我想要的是当时在服务器的控制台上打印字符串“我的名字是迈克”换行。

主要

public class Main {
public static void main(String[] args) {
        System.out.println("The server has been summoned.\n");
        System.out.println("The server is waiting for client to come...");
        try {
            ServerSocket servertest = new ServerSocket(2014);
            while (true) {
                try {
                    Socket ser = servertest.accept();
                    new Server.ThreadSer(ser).start();
                } catch (IOException e) {}
            }
        } catch (IOException e) {System.err.println(e);}       
}}}

服务器

public class Server {

    public static class ThreadSer extends Thread {
        private Socket s;
        public ThreadSer(Socket s) {
            this.s = s;
}
        @Override
        public void run() {
            try {
              String response = "This is the IP: " + s.getLocalAddress() + " that has come via port: "
                        + s.getLocalPort() + "\r\n";
                OutputStream out = s.getOutputStream();
                out.write(response.getBytes());

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

客户端

public class Client {

    public static void main(String[] args) throws UnknownHostException, IOException {
        Socket socket = new Socket("localhost", 2014);
        new OutputThread(socket.getInputStream()).start();
}

    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;
}}}}}

我的代码中遗漏了一些内容。

Answer 1

在您的客户端中，您不需要从服务器读取行，您需要输出流来将字符串发送到服务器:

示例:

在客户端

     public static class OutputThread extends Thread {
        private InputStream inputstream;
        Scanner scanner;
        String message;
        public OutputThread(OutputStream outputstream) {
            this.inputstream = inputstream;
}
        @Override
        public void run() {
            ObjectOutputStream output = new ObjectOutputStream(outputstream);
            scanner = new Scanner(System.in);
            while (true) {
                try {
                    System.out.print("InputMessage: ");
                    message = scanner.nextLine();
                    System.out.println(message);
                    output.writeObject(message); //send the string to the server
                output.flush();
                } catch (IOException exception) {
                    exception.printStackTrace();
                    break;
}}}}}

• 它的作用是请求输入消息，然后传递使用输出流向服务器发送消息。

在服务器中:

    public class Server {

    public static class ThreadSer extends Thread {
        private Socket s;
        public ThreadSer(Socket s) {
            this.s = s;
}
        @Override
        public void run() {
            try {
              String response = "This is the IP: " + s.getLocalAddress() + " that has come via port: "
                        + s.getLocalPort() + "\r\n";
                ObjectInputStream input = new ObjectInputStream(s.getInputStream()); 
               while(true){
                 Object object = input.readObject();
                 String command = ((String) object).trim(); //trim the string
                 System.out.println(command);
              }
            } catch (IOException e) { System.err.println(e); }
}}}

• 它正在做的是循环并读取客户端的行使用输入流发送给它。然后将其打印到服务器的控制台。