我正在使用 java 中的 TCP 进行简单的 1v1 “私人聊天”。目前，每当我使用 JButtons 时都会遇到问题。这是我第一次尝试使用 JButtons 和 ActionListeners，所以我不能 100% 确定这里发生了什么。
我有两个单独的服务器和客户端项目。要编译这些，它必须是两个独立的项目。
当我尝试按下按钮 A：启动服务器 B：连接到服务器时，就会出现问题。
按钮冻结，就好像它处于按下状态一样。在运行服务器并点击按钮时，要“松开”按钮，客户端必须尝试连接。服务器向客户端发送 MOTD，客户端应将其打印到文本窗口中。只有在服务器关闭后才会打印出 MOTD。再次，不知道为什么
服务器代码：
package net.valid4life.chat;
import java.awt.Component;
public class Chat implements ActionListener {
private static final long serialVersionUID = 1L;
private static JFrame mainFrame;
private static JPanel contentPane;
private static JTextArea chatWindow;
private static JTextArea serverWindow;
private static JTextField chatBox;
private static JTextField portBox;
private static JLabel currentStatusL;
private static JLabel portl;
private static JLabel status;
private static JButton startServerButton;
private static int port = 1234;
public static final int NOT_STARTED = 0;
public static final int WAITING_FOR_CLIENT = 1;
public static final int CONNECTED = 2;
private static int currentStatus = NOT_STARTED;
public static String newLine = "\n";
public static boolean started = false;
static ServerSocket listener = null;
public static void initGUI() {
mainFrame = new JFrame("Chat Server");
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
mainFrame.setContentPane(contentPane);
contentPane.setLayout(null);
chatWindow = new JTextArea();
chatWindow.setLineWrap(true);
chatWindow.setEditable(false);
chatWindow.setBounds(220, 15, 200, 215);
chatWindow.setAlignmentY(Component.BOTTOM_ALIGNMENT);
contentPane.add(chatWindow);
serverWindow = new JTextArea();
serverWindow.setLineWrap(true);
serverWindow.setEditable(false);
serverWindow.setBounds(10, 150, 201, 80);
contentPane.add(serverWindow);
chatBox = new JTextField();
chatBox.setBounds(221, 236, 199, 20);
contentPane.add(chatBox);
chatBox.setColumns(10);
portBox = new JTextField("1234");
portBox.setBounds(68, 37, 86, 25);
portBox.setActionCommand("portEnter");
portBox.setColumns(10);
contentPane.add(portBox);
portl = new JLabel("Port:");
portl.setFont(new Font("Times New Roman", Font.PLAIN, 16));
portl.setBounds(95, 20, 64, 14);
contentPane.add(portl);
status = new JLabel("Status:");
status.setFont(new Font("Times New Roman", Font.PLAIN, 16));
status.setBounds(15, 239, 46, 14);
contentPane.add(status);
currentStatusL = new JLabel(changeStatus(NOT_STARTED));
currentStatusL.setFont(new Font("Times New Roman", Font.PLAIN, 16));
currentStatusL.setBounds(60, 239, 151, 14);
contentPane.add(currentStatusL);
startServerButton = new JButton("Start Server");
startServerButton.setFont(new Font("Times New Roman", Font.PLAIN, 13));
startServerButton.setBounds(60, 96, 100, 40);
startServerButton.setActionCommand("start");
startServerButton.addActionListener(new Chat());
contentPane.add(startServerButton);
mainFrame.setVisible(true);
}
public static void main(String[] args) throws IOException {
initGUI();
}
public void actionPerformed(ActionEvent e) {
if ("start".equals(e.getActionCommand())) {
try {
port = Integer.parseInt(portBox.getText());
startServerButton.setEnabled(false);
listener = new ServerSocket(port);
changeStatus(WAITING_FOR_CLIENT);
serverWindow.append("The server has started on "
+ listener.getLocalPort());
} catch (IOException e1) {
e1.printStackTrace();
} finally {
try {
startServer();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}else
System.out.println("YOU BROKE IT");
}
public static void startServer() throws IOException {
try {
System.out.println("Looking for client");
new ServerThread(listener.accept()).start();
System.out.println("Found client");
} catch (Exception e) {
e.printStackTrace();
} finally {
listener.close();
}
}
public static String changeStatus(int newStatus) {
String newStatusText;
switch (newStatus) {
case 0:
newStatusText = "Server not started.";
break;
case 1:
newStatusText = "Waiting for client.";
break;
case 2:
newStatusText = "Connected to client.";
break;
default:
newStatusText = "Broken";
}
currentStatus = newStatus;
return newStatusText;
}
public static class ServerThread extends Thread {
private Socket socket;
public ServerThread(Socket socket) {
this.socket = socket;
Chat.serverWindow.append("New Connection from:"
+ socket.getInetAddress() + Chat.newLine);
Chat.changeStatus(CONNECTED);
}
public void run() {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
PrintWriter out = new PrintWriter(socket.getOutputStream(),
true);
out.println("MOTD:Welcome to the testing phase of this chat!");
out.println("To view commands simply type /help");
while (true) {
String input = in.readLine();
if (input == null || input.equals(".")) {
break;
}
out.println(input);
}
} catch (IOException e) {
Chat.serverWindow.append("Error handling client");
} finally {
try {
socket.close();
} catch (IOException e) {
Chat.serverWindow
.append("Couldn't close a socket, what's going on?");
}
Chat.serverWindow.append("Connection with client closed");
}
}
}
}
客户端代码：
package net.valid4life.chat;
import java.awt.Component;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
public class Chat implements ActionListener {
private static JFrame mainFrame;
private static JPanel contentPane;
private static JTextArea chatWindow;
private static JTextField chatBox;
private static JTextField portBox;
private static JLabel currentStatusL;
private static JLabel portl;
private static JLabel status;
private static JButton connectButton;
private static int port = 1234;
private static String hostIP = "127.0.0.1";
public static final int NOT_STARTED = 0;
public static final int WAITING_FOR_SERVER = 1;
public static final int CONNECTED = 2;
private static int currentStatus = NOT_STARTED;
public static boolean serverStarted = false;
private static JTextField IPField;
private static JLabel IPL;
private static BufferedReader in;
private static PrintWriter out;
public static void initGUI() {
public static void connectToServer() throws Exception {
port = Integer.parseInt(portBox.getText());
hostIP = IPField.getText();
Socket socket = new Socket("127.0.0.1", 1234);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream(), true);
for (int i = 0; i < 3; i++) {
chatWindow.append(in.readLine() + "\n");
}
// connectButton.setEnabled(false);
}
public static void main(String[] args) throws Exception {
initGUI();
connectToServer();
}
public void actionPerformed(ActionEvent e) {
if ("start".equals(e.getActionCommand())) {
try {
connectToServer();
} catch (Exception e1) {
e1.printStackTrace();
}
} else {System.out.println("ASDASD");}
}
public static String changeStatus(int newStatus) {
String newStatusText;
switch (newStatus) {
case 0:
newStatusText = "Server not started.";
break;
case 1:
newStatusText = "Waiting for client.";
break;
case 2:
newStatusText = "Connected to client.";
break;
default:
newStatusText = "Broken";
}
currentStatus = newStatus;
return newStatusText;
}
}
在此先感谢您的帮助！