我正在尝试为小项目创建GUI。这个项目是一个java服务器，目前我的代码工作正常，服务器已经连接，除了它之外的一切都没有出现循环，因此创建并显示了GUI的框架，但是你不能在病房之后与它交互。我知道循环在哪里，但我似乎无法找到一种方法让我的服务器监听新客户端，仍然能够与GUI交互。这是我的代码：
public class MainServerFrame {
private static JFrame frame;
private static ServerSocket serverSocket = null;
private static Socket clientSocket = null;
private static final int maxClientsCount = 999;
private static final clientThread[] threads = new clientThread[maxClientsCount];
private static StudentStoring studentDB = new StudentStoring();
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainServer();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public static void MainServer() {
// The default port number.
int portNumber = 3333;
try {
serverSocket = new ServerSocket(portNumber);
} catch (IOException e) {
System.out.println(e);
}
System.out.println("SERVER ONLINE");
initialize();
MainServerFrame window = new MainServerFrame();
MainServerFrame.getFrame().setVisible(true);
/*
* Create a client socket for each connection and pass it to a new client
* thread.
*/
这里我在哪里创建插座然后进入循环，我可以使用什么样的设计摆脱这个循环？
while (true) {
try {
clientSocket = serverSocket.accept();
int i = 0;
for (i = 0; i < maxClientsCount; i++) {
if (threads[i] == null) {
(threads[i] = new clientThread(clientSocket, threads, studentDB)).start();
System.out.println("client " + i + " is connected");
break;
}
}
if (i == maxClientsCount) {
PrintStream os = new PrintStream(clientSocket.getOutputStream());
os.println("Server too busy. Try later.");
os.close();
clientSocket.close();
}
} catch (IOException e) {
System.out.println(e);
}
}
}
/**
* Initialize the contents of the frame.
*/
private static void initialize() {
setFrame(new JFrame());
getFrame().setBounds(100, 100, 450, 300);
getFrame().setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel lblServer = new JLabel("SERVER:");
getFrame().getContentPane().add(lblServer, BorderLayout.NORTH);
}
public static JFrame getFrame() {
return frame;
}
public static void setFrame(JFrame frame) {
MainServerFrame.frame = frame;
}
}
我的客户
import java.awt.Font;
public class MainFrame implements Runnable {
//declare Jpanel
private static JFrame frmHome;
// The client socket
private static Socket clientSocket = null;
// The output stream
static ObjectOutputStream os;
// The input stream
static ObjectInputStream is;
private static BufferedReader inputLine = null;
private static boolean closed = false;
public static void main(String[] args) throws IOException{
// The default port.
int portNumber = 3333;
// The default host.
String host = "localhost";
/*
* Open a socket on a given host and port. Open input and output streams.
*/
try {
clientSocket = new Socket(host, portNumber);
is = new ObjectInputStream(clientSocket.getInputStream());
os = new ObjectOutputStream(clientSocket.getOutputStream());
os.flush();
System.out
.println("CONNECTED TO SERVER\n"
+ "Now using host=" + host + ", portNumber=" + portNumber);
} catch (UnknownHostException e) {
System.err.println("Don't know about host " + host);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to the host "
+ host);
}
/*
* If everything has been initialized then we want to write some data to the
* socket we have opened a connection to on the port portNumber.
*/
if (clientSocket != null && os != null && is != null) {
/* Create a thread to read from the server. */
new Thread(new MainFrame()).start();
}
}
public void run() {
/*
* Keep on reading from the socket till we receive "Bye" from the
* server. Once we received that then we want to break.
*/
MainFrame window = new MainFrame();
MainFrame.frmHome.setVisible(true);
String responseLine;
try {
while (!closed) {
}
} finally{
try {
is.close();
os.close();
clientSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public MainFrame() {
initialize();
}
//function to make window visible
void setVisible() throws IOException {
main(null);
}
private void initialize() {
//Initialise Main window with 3 options.
frmHome = new JFrame();
frmHome.setTitle("Home");
frmHome.setBounds(100, 100, 300, 372);
frmHome.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmHome.getContentPane().setLayout(null);
frmHome.setResizable(false);
JLabel lblWelcomeToSrs = new JLabel("Welcome to SRS");
lblWelcomeToSrs.setFont(new Font("Tahoma", Font.PLAIN, 14));
lblWelcomeToSrs.setBounds(86, 183, 112, 14);
frmHome.getContentPane().add(lblWelcomeToSrs);
//initialise all buttons and labels of window.
JButton btnAdStu = new JButton("Add a student");
btnAdStu.setBounds(10, 207, 126, 23);
btnAdStu.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
AddStudentFrame adus;
try {
try {
adus = new AddStudentFrame();
adus.setVisible();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
frmHome.setVisible(false);
} catch (ParseException e) {
e.printStackTrace();
}
}
});
frmHome.getContentPane().add(btnAdStu);
JButton btnCheckStud = new JButton("Search / Modify");
btnCheckStud.setBounds(146, 207, 127, 23);
btnCheckStud.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
SearchFrame searchFrame;
searchFrame = new SearchFrame();
searchFrame.setVisible();
}
});
frmHome.getContentPane().add(btnCheckStud);
JLabel lblNewLabel = new JLabel("");
lblNewLabel.setBounds(0, 0, 0, 0);
frmHome.getContentPane().add(lblNewLabel);
JLabel lblCreatedByRmi = new JLabel("Created by R\u00E9mi Tuyaerts");
lblCreatedByRmi.setBounds(147, 318, 184, 14);
frmHome.getContentPane().add(lblCreatedByRmi);
JButton btnNewButton = new JButton("Complete List of Students");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
CompleteListFrame studentList = new CompleteListFrame();
studentList.setVisible();
}
});
btnNewButton.setBounds(52, 241, 184, 23);
frmHome.getContentPane().add(btnNewButton);
// wonderful pictures of his excellence design by Yasser
JLabel lblNewLabel_1 = new JLabel("");
Image img = new ImageIcon(frmHome.getClass().getResource("/michaelchung.jpg")).getImage();
lblNewLabel_1.setIcon(new ImageIcon(img));
lblNewLabel_1.setBounds(80, 11, 120, 148);
frmHome.getContentPane().add(lblNewLabel_1);
}
}
答案 0 :(得分：1)
我首先要提到的是在方法签名中使用static。他们应该不为static，并且您 不应该尝试静态访问它们（MainServerFrame.getFrame().setVisible(true);）。取出所有方法签名中的static，添加window.getFrame().setVisible(true);
其次，正在事件调度线程上创建MainServerFrame。 EDT处理所有UI交互。虽然您的代码不完整，但while循环显示在MainServerFrame的构造函数中。这个问题是while循环阻塞事件线程，导致无响应。要修复它，你可以简单地为while循环启动一个新线程。
new Thread(new Runnable(){
public void run() {
while (true) {
...
}
}
}).start();
尝试更新UI的新线程中的任何调用都应该包含在SwingUtilities.invokeLater中。像
new Thread(new Runnable(){
public void run() {
while (true) {
...
SwingUtilities.invokeLater(new Runnable(){
public void run() {
label.setText(...);
}
});
}
}
}).start();
这是一个简单的重构器。我拿出一些代码只是为了让这个例子更简单
public class MainServerFrame {
private JFrame frame;
private ServerSocket serverSocket = null;
private Socket clientSocket = null;
private int maxClientsCount = 999;
private JTextArea serverLog = new JTextArea(10, 40);
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainServerFrame app = new MainServerFrame();
app.getFrame().setVisible(true);
app.startServer();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public MainServerFrame() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(serverLog);
frame.pack();
frame.setLocationByPlatform(true);
}
public JFrame getFrame() {
return frame;
}
public void startServer() {
int portNumber = 3333;
try {
serverSocket = new ServerSocket(portNumber);
} catch (IOException e) {
System.out.println(e);
}
new Thread(new Runnable() {
public void run() {
while (true) {
try {
clientSocket = serverSocket.accept();
final String data =
(new DataInputStream(clientSocket.getInputStream())).readUTF();
SwingUtilities.invokeLater(new Runnable(){
public void run() {
serverLog.append(data);
serverLog.append("\n");
}
});
} catch (IOException e) {
System.out.println(e);
}
}
}
}).start();
}
}
更新：简单客户端
import java.io.DataOutputStream;
import java.net.Socket;
import java.util.Scanner;
public class Cilent {
public static void main(String[] args) throws Exception {
Socket socket = new Socket("localhost", 3333);
Scanner scanner = new Scanner(System.in);
String data = scanner.nextLine();
(new DataOutputStream(socket.getOutputStream())).writeUTF(data);
}
}