Question

我有两个疑问

第一

我正在netbeans中创建桌面应用程序，我想打开端口 由用户输入。我已经在一个文件和中为用户创建了两个文件，获取端口数字处理就是第二个文件。

我有该类的已创建 对象，用于获取用户输入的端口号未显示任何错误，但我没有检查使用tcp视图

的那个号码上的端口未打开

这是第一个文件的代码

Server.java

 package server;
    import java.io.*;
    import java.net.*;
    import javax.swing.JFrame;

    public class Server extends Thread {
      public static int SERVERPORT;
      private boolean running = false;
      public volatile boolean stop = false;
      public Socket client = null;

    public static void main(String[] args) {
        mainFrame frame = new mainFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
        SERVERPORT = frame.portnum;//here i am getting port number from 2nd file
    }

    @Override
    public void run() {
        super.run();
        running = true;
        try {
            System.out.println("Server Has Started........ \n Waiting for client........");
            ServerSocket serverSocket = new ServerSocket(SERVERPORT);
            try {
                while (!stop && running) {
                    client = serverSocket.accept();
                    System.out.println("Connection Accepted......");
                    BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
                    String usercmnd = in.readLine();
                    if (usercmnd != null) {
                        Runtime runtime = Runtime.getRuntime();
                        Process p = runtime.exec(usercmnd);
                    }
                }

这是第二个文件，用户必须输入端口号

mainFrame.java

package server;

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.net.*;
//import server.Server;


/**
 *
 * @author admin
 */
public class mainFrame extends JFrame {
private Server  mServer;
public int portnum;
   public mainFrame() {
        super("mainFrame");
        mServer = new Server();
        initComponents();
        setIcon();labInfo.setText("Not Connected");
        try{ ipAdd.setText(String.valueOf(InetAddress.getLocalHost().getHostAddress()));
        }catch(Exception e){labInfo.setText(e.getMessage());}

    }


    private void connActionPerformed(java.awt.event.ActionEvent evt) {                                     
        if(port.getText().equals(""))
        {
           labInfo.setText("Port number cannot be empty!!");
        }else{
            portnum=Integer.parseInt(port.getText());//here i am getting user's entered port number
            conn.setEnabled(false);port.setEditable(false);
            labInfo.setText("Waiting for Connection.....");
            mServer.start();
        }
    }                                    

    private void disconnActionPerformed(java.awt.event.ActionEvent evt) {                                        
        mServer.requestStop();
        labInfo.setText("Not Connected");
        port.setEditable(true);
        conn.setEnabled(true);        
    }

SECOND

有没有办法检查输入的端口号目前是否正在使用，那么我们可以提醒用户使用另一个端口号... ???

Answer 1

我建议您先运行mainFrame类，然后单击Server调用Button类，以检索{{1}中输入的端口号}}。我似乎无法帮助完整代码，但您可以将TextField方法更改为

connActionPerformed()

然后你可以实现这样的构造函数：

   private void connActionPerformed(java.awt.event.ActionEvent evt) {
        boolean success = false;
        do {
            try {
                if (port.getText().equals("")) {
                    labInfo.setText("Port number cannot be empty!!");
                } else {
                    portnum = Integer.parseInt(port.getText());//here i am getting user's entered port number
                    ServerSocket serverSocket = new ServerSocket(portnum);
                    System.out.println("Connected to Server");
                    mServer = new Server(serverSocket);//Which means you need to implement a constructor with a Server argument.

                    //conn.setEnabled(false);
                    //port.setEditable(false);
                    //abInfo.setText("Waiting for Connection.....");
                    mServer.start();
                    success = true;
                }

            } catch (BindException ex) {
                System.out.println("Port in use");
            }
        } while (success);

    }

注意：由于此代码不完整，请根据您的需要进行操作。希望这会有所帮助，谢谢。

如何打开用户java输入的端口

1 个答案: