构建一个简单的聊天客户端

Question

我正在构建一个简单的聊天客户端，它只能发送和接收消息。

我使用在我自己的计算机上运行的服务器，该服务器将发送到它的任何消息发送回连接到该服务器的所有用户。

当我通过单击“发送按钮”向服务器发送消息时，服务器没有按预期将消息发回给我。因此，要么我的输出流不起作用，要么我的输入消息侦听器不起作用但无法找出问题所在。

我可能会补充一点，我没有收到任何错误消息/异常并且连接到服务器正常

public class Chatt extends JFrame implements Runnable{
    private JPanel topPanel = new JPanel();
    private JPanel bottomPanel = new JPanel();
    private JTextArea chattArea = new JTextArea();
    private JButton sendButton = new JButton("Skicka");
    private JLabel chattPerson = new JLabel("Du chattar med: ");
    private JTextField chattField = new JTextField(15);
    private Thread thread;
    private int port;
    private String ip;
    private DataInputStream in;
    private DataOutputStream out;
    private Socket s;


    public Chatt(String ip, int port){
        this.ip=ip;
        this.port=port;
        Konstruktor();
        }
    public Chatt(){
        ip="127.0.0.1";
        port=2000;
        Konstruktor();
        }
    public Chatt(String ip){
        this.ip=ip;
        port=2000;
        Konstruktor();
        }

    public void Konstruktor(){
        setLayout(new BorderLayout());

        chattArea.setSize(70, 50);  
        add(chattArea, BorderLayout.CENTER);

        bottomPanel.setLayout(new BoxLayout(bottomPanel, BoxLayout.X_AXIS));
        bottomPanel.add(sendButton);
        bottomPanel.add(chattField);
        sendButton.addActionListener(new sendListener());
        add(bottomPanel, BorderLayout.SOUTH);

        topPanel.setLayout(new BoxLayout(topPanel, BoxLayout.X_AXIS));
        topPanel.add(chattPerson);
        add(topPanel, BorderLayout.NORTH);

        try {
            //s = new Socket("atlas.dsv.su.se", 9494);
            s=new Socket(ip, port); 
            } 
        catch (UnknownHostException e) {
                System.out.println("Connection failed");
                } 
        catch (IOException e) {
                    }
        try{
        in= new DataInputStream(new BufferedInputStream(s.getInputStream()));
        out= new DataOutputStream(new BufferedOutputStream(s.getOutputStream()));
        }
        catch(UnknownHostException e){
                System.out.println("Host unknown");
            }
        catch(IOException e){

        }
        thread = new Thread(this);
        thread.start();

        setTitle("Connected to "+ip+" på port "+port);
        chattArea.setEditable(false);
        setSize(400, 500);
        setVisible(true);
        setResizable(false);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
    public void run() {

            while(true){
                System.out.println("tråden igång");
                try {
                    String temp = in.readUTF();
                    System.out.println(temp);
                    chattArea.append(temp);
                } catch (IOException e) {

                }

            }       
    }


    public class sendListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
            String chattString = chattField.getText();
                try {
                    out.writeUTF(chattString);
                    out.flush();
                    } 
                catch (IOException e1) {

                    }
                chattArea.append("Du: "+chattString+"\n");
                chattField.setText("");

            }

    }



    public static void main(String[] args){
        //new Chatt("127.0.0.1", 2000);
        //new Chatt();
        new Chatt("127.0.0.1");
    }

}

Answer 1

我可以确认聊天服务器无法正常工作。我确实构建了自己的服务器并且发送/接收消息工作正常，所以我的代码没有任何问题。