java - 如何将主类中的TCP连接变量传递给另一个JFrame类？

Question

我有一个主类，其中包含启动与服务器连接的方法。 在 JFrame 类中，我有一个按钮注册，按下该按钮时，它将检索用户输入并将其发送到服务器。 我的问题是，由于从主方法传递变量时出错，与服务器的连接无法正常工作。 我尝试在 JFrame 类中声明连接变量，并在构造函数中将它们分配给主类变量，但这也不起作用。

主类:

     public class TCPClient  {
    Socket clientSocket;
DataOutputStream outToServer;
BufferedReader inFromServer;
String test;


public void start() throws Exception{
   clientSocket= new Socket("localhost", 6789); 
   outToServer=  new DataOutputStream(clientSocket.getOutputStream()); 
   inFromServer= new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); 
   test="abc";

}

public static void main(String[] args) throws Exception {
    TCPClient c=new TCPClient ();

    c.start();
      NewJFrame j=new NewJFrame();
      j.setVisible(true);
  }}

JFrame 类:

    public class NewJFrame extends javax.swing.JFrame {
  JTextField username = new JTextField();
  JTextField name = new JTextField();
JTextField Email = new JTextField();
 JTextField Address = new JTextField();
    JTextField password = new JPasswordField();


    BufferedReader inFromUser;
    Socket clientSocket;
    DataOutputStream outToServer;
    BufferedReader inFromServer;
    String test;


public NewJFrame() throws Exception {
     TCPClient c=new TCPClient();
     c.start();
    inFromServer=c.inFromServer;
    clientSocket=c.clientSocket;
    outToServer=c.outToServer;
    inFromServer=c.inFromServer;
    test=c.test;
    initComponents();
       }
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
System.out.print(test);
    Object[] message = {
"Full Name:", name,
"Email:", Email,
"Address:", Address,
"Username:", username,
"Password:", password
 };

   int option = JOptionPane.showConfirmDialog(null, message,"Sign in",JOptionPane.OK_CANCEL_OPTION);

    try{

    System.out.print(test);

    outToServer.writeBytes("signup"+ '\n');
    outToServer.writeBytes(name.getText() + '\n'); 
    outToServer.writeBytes(Email.getText() + '\n'); 
    outToServer.writeBytes(Address.getText() + '\n'); 
    outToServer.writeBytes(username.getText() + '\n');
    outToServer.writeBytes(password.getText() + '\n');

    JOptionPane.showMessageDialog(null, inFromServer.readLine());

    clientSocket.close(); 

   }
   catch(Exception e)
   {

    }

Answer 1

答案就在问题中:

a mistake with passing the variables from the main method

您的 main 方法不会将任何内容传递给 JFrame 构造函数。相反，构造函数创建一个新的 TCP 客户端并再次启动它。构造函数应定义为

public NewJFrame(TCPClient tcpClient) {
    ...

并且 main 方法应该将已经创建并启动的 TCPClient 传递给构造函数。