我制作了服务器和客户端应用程序（单独的jar文件） 服务器只能将文件发送到客户端，客户端只能接受服务器发送的任何文件。
我的问题是，为什么我的客户端应用程序窗口不会关闭（按下关闭按钮时），直到服务器先关闭？
这是我的代码：
服务器端
public sServerUI() {
super("Server : "+System.getenv("COMPUTERNAME")); // mendapatkan nama komputer
initComponents();
}
public void startListener(){
Random randomGen = new Random();
int myPort = randomGen.nextInt(9999);
try{
server = new ServerSocket(myPort);//Bebas portnya, tp nggk boleh sudah terpakai atau pakai random jg bisa
btnListen.setEnabled(false);
while(_key == null) {
_key = JOptionPane.showInputDialog(this, "Input your Key : ", "Insert Key", JOptionPane.PLAIN_MESSAGE);
}
if(_key.equals("")) {
_key = "Random";
txtMessage.setText(txtMessage.getText()+"Invalid key inputted, key automatically set to '"+_key+"'\n");
} else txtMessage.setText(txtMessage.getText()+"Key set to '"+_key+"'\n");
} catch (IOException e) {//Kalau sudah terpakai muncul error
JOptionPane.showMessageDialog(this, "Could not listen at " + myPort);
//Gagal, keluarin info
} finally{
myPort = server.getLocalPort();
lblPort.setText("Port: "+myPort);
System.out.println("Port: "+myPort);
}
_acceptClient.start();
}
public void windowClosing(WindowEvent e){
try {
server.close();
for (int i=0;i<_numberOfClient;i++){
//socketIn[i].close();
_socketOut[i].close();
}
} catch (IOException ex) {
System.out.println("Error "+ex.getMessage());
}
}
class Accepter extends Thread{
@Override
public void run(){
while (true){
try{
client[_numberOfClient] = server.accept();
_numberOfClient++;
lblStatus.setText("Status: "+_numberOfClient+" client(s) connected");
Handler handleClient = new Handler(_numberOfClient-1);
handleClient.start();
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "Accept failed: " + e.getMessage());
}
}
}
}
class Handler extends Thread{
private int arr;
Handler(int ar){
arr = ar;
try{
//socketIn[arr] = new BufferedReader(new InputStreamReader(client[arr].getInputStream()));
_socketOut[arr] = new DataOutputStream(client[arr].getOutputStream());
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "Read failed");
}
}
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
btnListen = new javax.swing.JButton();
lblStatus = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
txtMessage = new javax.swing.JTextArea();
btnSend = new javax.swing.JButton();
lblPort = new javax.swing.JLabel();
fileBtn = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setAutoRequestFocus(false);
setBackground(new java.awt.Color(255, 255, 255));
setResizable(false);
btnListen.setText("Start Listening");
btnListen.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnListenActionPerformed(evt);
}
});
lblStatus.setText("Status: no client connected");
txtMessage.setEditable(false);
txtMessage.setColumns(20);
txtMessage.setRows(5);
jScrollPane1.setViewportView(txtMessage);
btnSend.setText("Send");
btnSend.setEnabled(false);
btnSend.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnSendActionPerformed(evt);
}
});
lblPort.setText("Port: ");
fileBtn.setText("Choose File");
fileBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
fileBtnActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(btnListen)
.addGap(18, 18, 18)
.addComponent(lblStatus)
.addGap(0, 133, Short.MAX_VALUE))
.addComponent(jScrollPane1)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(lblPort, javax.swing.GroupLayout.PREFERRED_SIZE, 209, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(btnSend))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(fileBtn)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btnListen)
.addComponent(lblStatus))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 227, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(9, 9, 9)
.addComponent(fileBtn)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btnSend)
.addComponent(lblPort))
.addContainerGap(14, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void btnListenActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
startListener();
}
private void btnSendActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
if(_numberOfClient > 0) {
int packetIndex = 1;
String ext = getExt(_filePath, '.');
byte fileChunk[];
int k = 0;
int blockIndex = 0;
sendHeader("start "+_binaryData.length+" "+ext+" ");
txtMessage.setText(txtMessage.getText()+"Sending file ...\n");
for(int i = 0; i < _binaryData.length; i++) {
if(k >= Math.ceil((double)_binaryData.length/10.0) || i == _binaryData.length-1) {
if(i == _binaryData.length-1) k++;
fileChunk = new byte[k];
for(int x = 0; x < k; x++) {
fileChunk[x] = _binaryData[blockIndex];
blockIndex++;
}
printByteArr("file chunk : ", fileChunk);
sendHeader(packetIndex+" ");
packetIndex++;
sendData(rc4(_key, fileChunk));
k = 0;
}
k++;
}
sendHeader("end");
txtMessage.setText(txtMessage.getText()+"File Sent !\n\n");
} else JOptionPane.showMessageDialog(this, "No Client Connected !", "Error", JOptionPane.ERROR_MESSAGE);
}
private void fileBtnActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("d:/Kul/Smstr 6/Kripto n Steno/Stream Cipher/"));
int returnVal = chooser.showOpenDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION) {
_filePath = chooser.getSelectedFile().getPath();
try {
_file = new File(_filePath);
_fis = new FileInputStream(_file);
_binaryData = new byte[(int)_file.length()];
System.out.println("file size : "+(int)_file.length()+" byte(s)");
System.out.print("Isi file : ");
_fis.read(_binaryData);
_fis.close();
for(int i = 0; i < _binaryData.length; i ++) {
System.out.print(_binaryData[i]+" ");
}
System.out.print("end of file\n");
String stringBuatDitampilin = getExt(_filePath, (char)92);
txtMessage.setText(txtMessage.getText() + "'" + stringBuatDitampilin + "' Loaded !\n");
btnSend.setEnabled(true);
} catch(java.io.IOException e) {
JOptionPane.showMessageDialog(this, e.toString(), "IO Error", JOptionPane.ERROR_MESSAGE);
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(sServerUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new sServerUI().setVisible(true);
}
});
}
客户端
public sClientUI() {
super("Client");
initComponents();
}
public void listenSocket(){
//Create _socket connection
try{
_socket = new Socket(txtHost.getText(), Integer.parseInt(txtPort.getText()));
_socketIn = new DataInputStream(_socket.getInputStream());
txtMessage.setText(txtMessage.getText()+"Succesfully connected to "+txtHost.getText()+" !\n");
while(_key == null) {
_key = JOptionPane.showInputDialog(this, "Input your Key : ", "Insert Key", JOptionPane.PLAIN_MESSAGE);
}
if(_key.equals("")) {
_key = "Random";
txtMessage.setText(txtMessage.getText()+"Invalid key inputted, key automatically set to '"+_key+"'\n");
} else txtMessage.setText(txtMessage.getText()+"Key set to '"+_key+"'\n");
txtHost.setEditable(false);
txtPort.setEditable(false);
btnConnect.setEnabled(false);
myListener = new Timer(250, readLine);
myListener.start();
} catch (UnknownHostException e) {
JOptionPane.showMessageDialog(this, "Unknown host: "+e.getMessage(), "Unknown Hostname", JOptionPane.ERROR_MESSAGE);
} catch (IOException e) {
JOptionPane.showMessageDialog(this, "Either your hostname is wrong, or you entered wrong port number\n"+e.getMessage(),"Input Error", JOptionPane.ERROR_MESSAGE);
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(this, e.getMessage(),"Invalid Port Number", JOptionPane.ERROR_MESSAGE);
}
}
public void windowClosing(WindowEvent e){
try {
_socket.close();
_socketIn.close();
} catch (IOException ex) {
System.out.println("Error "+ex.getMessage());
}
}
ActionListener readLine = new ActionListener(){
@Override
public void actionPerformed(ActionEvent ae) {
try{
int mLen;
byte tempReceiver[];
String header;
if((header = _socketIn.readUTF()) != null) {
if(!_readingHeader) {
if(!header.equals("end")) {
mLen = _socketIn.readInt();
System.out.println("mLen : "+mLen);
tempReceiver = new byte[mLen];
_socketIn.readFully(tempReceiver, 0, mLen);
printByteArr("bytes : ", tempReceiver);
txtMessage.setText(txtMessage.getText()+"Packet-"+header+" received : "+convertToString(tempReceiver)+"\n");
processBinaryData(rc4(_key, tempReceiver));
} else {
_binaryIndex = 0;
txtMessage.setText(txtMessage.getText()+"All packets downloaded !\n");
try {
String namaBaru = "File Output";
try (FileOutputStream out = new FileOutputStream(namaBaru+"."+_fileExt)) {
out.write(_binaryData);
} // ga perlu di close, karena sudah pake try-with-resource. fungsi ini otomatis close file yang sudah di try
txtMessage.setText(txtMessage.getText()+namaBaru+"."+_fileExt+" has been created !"+"\n\n");
} catch(FileNotFoundException f) {
System.out.println("Error : " + f.getMessage());
} catch(IOException io) {
System.out.println("Error : " + io.getMessage());
}
printByteArr("Complete File : ", _binaryData);
System.out.println(header);
_readingHeader = true;
}
} else {
processHeader(header);
System.out.println("header : "+header);
txtMessage.setText(txtMessage.getText()+"Receiving new file ...\n");
_readingHeader = false;
}
}
} catch (IOException e) {
System.out.println("Read failed");
}
}
};
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
txtMessage = new javax.swing.JTextArea();
jLabel2 = new javax.swing.JLabel();
txtHost = new javax.swing.JTextField();
jLabel3 = new javax.swing.JLabel();
txtPort = new javax.swing.JTextField();
btnConnect = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
txtMessage.setEditable(false);
txtMessage.setColumns(20);
txtMessage.setRows(5);
jScrollPane1.setViewportView(txtMessage);
jLabel2.setText("Hostname: ");
jLabel3.setText("Port: ");
btnConnect.setText("Connect");
btnConnect.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnConnectActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(txtHost, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 23, Short.MAX_VALUE)
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(txtPort, javax.swing.GroupLayout.PREFERRED_SIZE, 111, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(btnConnect)
.addGap(0, 0, Short.MAX_VALUE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(txtHost, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3)
.addComponent(txtPort, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnConnect)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 212, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
private void btnConnectActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
listenSocket();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(sClientUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new sClientUI().setVisible(true);
}
});
}
答案 0 :(得分：0)
在关闭客户端窗口之前必须关闭客户端套接字...