*许多关于GUI的代码都是由NetBeans生成的。
ClientGUI.java
public class ClientGUI extends javax.swing.JFrame {
String username;
/**
* Creates new form NewJFrame
*/
public ClientGUI() {
initComponents();
}
/**
* 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() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
usernameTxt = new javax.swing.JTextField();
passwordTxt = new javax.swing.JTextField();
loginBtn = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
uploadBtn = new javax.swing.JButton();
jLabel4 = new javax.swing.JLabel();
downloadBtn = new javax.swing.JButton();
logOffBtn = new javax.swing.JButton();
portTxt = new javax.swing.JTextField();
hostTxt = new javax.swing.JTextField();
createFile = new javax.swing.JButton();
fileNameTxt = new javax.swing.JTextField();
connectionLbl = new javax.swing.JLabel();
notifyLbl = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBackground(new java.awt.Color(0, 0, 51));
jLabel1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jLabel1.setForeground(new java.awt.Color(255, 255, 255));
jLabel1.setText("File Transfer System");
usernameTxt.setText("Username");
passwordTxt.setText("Password");
loginBtn.setText("Login");
loginBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
loginBtnActionPerformed(evt);
}
});
jLabel2.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel2.setForeground(new java.awt.Color(255, 255, 255));
jLabel2.setText("Login");
jLabel3.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel3.setForeground(new java.awt.Color(255, 255, 255));
jLabel3.setText("Upload");
uploadBtn.setText("Upload");
uploadBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
uploadBtnActionPerformed(evt);
}
});
jLabel4.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel4.setForeground(new java.awt.Color(255, 255, 255));
jLabel4.setText("Download");
downloadBtn.setText("Search File");
logOffBtn.setBackground(new java.awt.Color(153, 0, 0));
logOffBtn.setForeground(new java.awt.Color(255, 255, 255));
logOffBtn.setText("Log Off");
logOffBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
logOffBtnActionPerformed(evt);
}
});
portTxt.setText("7");
portTxt.setToolTipText("Port");
hostTxt.setText("localhost");
createFile.setText("Create File");
createFile.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
createFileActionPerformed(evt);
}
});
fileNameTxt.setText("File Name");
connectionLbl.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
connectionLbl.setForeground(new java.awt.Color(255, 0, 0));
connectionLbl.setText("Not Connected");
notifyLbl.setFont(new java.awt.Font("Tahoma", 0, 12)); // NOI18N
notifyLbl.setForeground(java.awt.Color.green);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(21, 21, 21)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(connectionLbl)
.addComponent(hostTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(152, 152, 152)
.addComponent(jLabel1))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(portTxt, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(usernameTxt, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(passwordTxt, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(loginBtn, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 82, Short.MAX_VALUE))
.addGap(101, 101, 101)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(notifyLbl)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(fileNameTxt, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel3, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(createFile, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(uploadBtn, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(120, 120, 120)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(downloadBtn)
.addComponent(jLabel4)
.addComponent(logOffBtn))))))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(26, 26, 26)
.addComponent(connectionLbl)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 68, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(jLabel3)
.addComponent(jLabel4))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(usernameTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(downloadBtn)
.addComponent(createFile))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(passwordTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(hostTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(10, 10, 10)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(portTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(fileNameTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(loginBtn)
.addComponent(logOffBtn)
.addComponent(uploadBtn))
.addGap(42, 42, 42)
.addComponent(notifyLbl)
.addGap(36, 36, 36))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
public ClientGUI(ActionListener listener)
{
uploadBtn.addActionListener(listener);
add(uploadBtn);
}
private void loginBtnActionPerformed(java.awt.event.ActionEvent evt) {
try {
String hostname = hostTxt.getText();
String port = portTxt.getText();
username = usernameTxt.getText();
String password = passwordTxt.getText();
ClientGUI client = new ClientGUI();
Users usersClass = new Users();
if (hostname.length() == 0) // if user did not enter a name
{
hostname = "localhost"; // use the default host name
}
if (port.length() == 0) // if user did not enter a name
{
port = "7"; // use the default host name
}
Map<String, String> users;
users = usersClass.getSet();
if (users.containsKey(username) && users.containsValue(password)) {
JOptionPane.showMessageDialog(null, "Logged in Successfully. Welcome " + username);
connectionLbl.setText("Connected");
connectionLbl.setForeground(Color.green);
hostTxt.setEditable(false);
portTxt.setEditable(false);
usernameTxt.setEditable(false);
passwordTxt.setEditable(false);
loginBtn.setEnabled(false);
createUserFolder(username);
new File("C:\\ServerFolder\\" + username).mkdirs();
} else if (!users.containsKey(username) && !users.containsValue(password)) {
JOptionPane.showMessageDialog(null, "User does not exist. Try again.");
}
ClientHelper helper
= new ClientHelper(hostname, port, username, password);
boolean check = client.validateUsername(username);
while (check) {
String serverResponse = helper.sendMessageUsername(username);
System.out.println(serverResponse);
check = false;
}
} catch (SocketException ex) {
Logger.getLogger(ClientGUI.class.getName()).log(Level.SEVERE, null, ex);
} catch (UnknownHostException ex) {
Logger.getLogger(ClientGUI.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(ClientGUI.class.getName()).log(Level.SEVERE, null, ex);
}
}
public File createUserFolder(String folderName) {
File directory = new File("C:\\" + folderName);
// if the directory does not exist, create it
if (!directory.exists()) {
System.out.println("Creating Directory... ");
boolean result = false;
try {
directory.mkdir();
result = true;
} catch (SecurityException se) {
//handle it
}
if (result) {
System.out.println("Directory Created");
}
}
return directory;
}
private void logOffBtnActionPerformed(java.awt.event.ActionEvent evt) {
hostTxt.setEditable(true);
portTxt.setEditable(true);
usernameTxt.setEditable(true);
passwordTxt.setEditable(true);
loginBtn.setEnabled(true);
connectionLbl.setText("Not Connected");
connectionLbl.setForeground(Color.red);
}
public void createFile(String fileName) {
String sb = "TEST CONTENT";
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("C:\\" + fileName));
int retrieval = chooser.showSaveDialog(null);
if (retrieval == JFileChooser.APPROVE_OPTION) {
try {
FileWriter fw = new FileWriter(chooser.getSelectedFile() + ".txt");
fw.write(sb.toString());
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
private void createFileActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
createFile(username);
notifyLbl.setText("File Created!");
Timer timer = new Timer(5000, e -> notifyLbl.setText(""));
timer.setRepeats(false);
timer.start();
}
private void uploadBtnActionPerformed(java.awt.event.ActionEvent evt) {
try {
ActionListener listener = new Server();
ClientGUI g = new ClientGUI();
g.uploadBtn.addActionListener(listener);
// TODO add your handling code here:
String fileName = fileNameTxt.getText();
String hostname = hostTxt.getText();
String port = portTxt.getText();
String username = usernameTxt.getText();
String password = passwordTxt.getText();
ClientHelper helper
= new ClientHelper(hostname, port, username, password);
File file = new File("C:\\" + username + "\\" + fileName + ".txt");
if (!file.exists()) {
System.out.println("File not found!");
} else {
String myFile = helper.writeFileAndSend(fileName, username);
System.out.println("Response:\n" + "File name: " + myFile + " User: " + username);
}
} catch (SocketException ex) {
Logger.getLogger(ClientGUI.class.getName()).log(Level.SEVERE, null, ex);
} catch (UnknownHostException ex) {
Logger.getLogger(ClientGUI.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(ClientGUI.class.getName()).log(Level.SEVERE, null, ex);
}
}
public boolean validateUsername(String username) {
username = username.trim();
if (username == null || username.equals("")) {
return false;
}
if (!username.matches("[a-zA-Z]*")) {
return false;
}
return true;
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
ClientGUI g = new ClientGUI(new Server());
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ClientGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel connectionLbl;
private javax.swing.JButton createFile;
private javax.swing.JButton downloadBtn;
private javax.swing.JTextField fileNameTxt;
private javax.swing.JTextField hostTxt;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JPanel jPanel1;
private javax.swing.JButton logOffBtn;
private javax.swing.JButton loginBtn;
private javax.swing.JLabel notifyLbl;
private javax.swing.JTextField passwordTxt;
private javax.swing.JTextField portTxt;
public javax.swing.JButton uploadBtn;
private javax.swing.JTextField usernameTxt;
// End of variables declaration
}
Server.java
public class Server extends ClientGUI implements ActionListener {
public static void main(String[] args) {
ClientGUI client = new ClientGUI();
client.createUserFolder("ServerFolder");
int serverPort = 7; // default port
if (args.length == 1) {
serverPort = Integer.parseInt(args[0]);
}
try {
// instantiates a datagram socket for both sending
// and receiving data
ServerDatagramSocket mySocket = new ServerDatagramSocket(serverPort);
System.out.println("Server Ready...");
while (true) { // forever loop
//Login
DatagramMessage request = mySocket.receiveMessageAndSender();
System.out.println("201 - Request Received");
String message = request.getMessage();
System.out.println("204 - Login Successful - Welcome " + message);
// Now send the echo to the requestor
mySocket.sendMessage(request.getAddress(),
request.getPort(), message);
//End Login
//Upload
System.out.println("\n304 - Upload Requested...");
byte[] receiveData = new byte[MAX_LEN];
byte[] sendData = new byte[MAX_LEN];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
mySocket.receive(receivePacket);
String sentence = new String(receivePacket.getData());
SimpleDateFormat df = new SimpleDateFormat("EEE, MMM d, ''yy");
File moddedFile = new File("C:\\ServerFolder\\");
mySocket.sendMessage(request.getAddress(), request.getPort(), "Last upload on " + df.format(moddedFile.lastModified()));
System.out.println("305 - Last upload on " + df.format(moddedFile.lastModified()));
System.out.println("306 - Recieved Data: " + sentence);
InetAddress IPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
String capitalizedSentence = sentence.toUpperCase();
sendData = capitalizedSentence.getBytes();
DatagramPacket sendPacket
= new DatagramPacket(sendData, sendData.length, IPAddress, port);
mySocket.send(sendPacket);
System.out.println("\n307 - File Recieved and ready for upload...");
Writer writer = null;
String todaysDate = df.format(new Date());
writer = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream("C:\\ServerFolder\\" + message.trim() + "\\" + todaysDate + ".txt"), "utf-8"));
writer.write(sentence);
System.out.println("308 - File upload complete!");
JOptionPane.showMessageDialog(null, "File upload complete!");
writer.close();
//End Upload
} //end while
} // end try
catch (Exception ex) {
ex.printStackTrace();
} // end catch
}//end main
@Override
public void actionPerformed(ActionEvent e) {
if((e.getActionCommand()).equals("Upload"))
JOptionPane.showMessageDialog(null, "Button Pressed");
}
} // end class
所以你可以这就是我所在的地方。我使用的是NetBeans，NetBeans为我创建了一个actionPerformed方法，可以在单击按钮时进行监听，这在客户端完美运行。但我想知道如何从Server类检查客户端上的按钮是否被按下。换句话说，我想在客户端单击按钮时在服务器类上执行某些操作，客户端具有通过NetBeans工具箱创建的GUI。任何帮助赞赏。当前代码不起作用。请记住，在运行客户端之前必须运行服务器，如果有帮助的话。
编辑：
这就是一切。这两个课我遇到了问题。按照目前的方式，uploadBtn为null，不确定原因。按钮初始化后调用构造函数。
答案 0 :(得分：2)
然后将以下内容放入客户端：
ActionListener listener = new EventListener();
fileName.addActionListener(listener);
hostname.addActionListener(listener);
port.addActionListener(listener);
username.addActionListener(listener);
password.addActionListener(listener);
fileName（或主机名或用户名或密码）是给予JButton的名称。
还在服务器中包含以下内容：
String option = e.getActionCommand();
是ActionEvent实例
当单击一个按钮时，传递给JButton构造函数的初始字符串将是字符串的值，所以如果：
JButton fileNameButton = new JButton("file Name");
单击按钮时，选项将等于“文件名”。
注意我的类名为EventListener。