线程中的异常＆＃34; AWT-EventQueue-0＆＃34; java.lang.Error：未解决 编译问题：
局部变量textField_1定义在 封闭范围必须是最终的或有效的最终的 在 swing.a1 $ 4.actionPerformed（a1.java:179）
我收到此错误，我无法将变量设置为final，因为它会破坏gui代码textField_1 = new JTextField();该怎么做？
public class a1 extends JFrame {
JPanel contentPane;
JTextField textField_1;
JTextField textField_2;
JTextField key_text;
public static void encDec(String key,int cipherMode,File in,File out )
throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException,
NoSuchPaddingException, IOException, NullPointerException
{
FileInputStream fis= new FileInputStream(in);
FileOutputStream fos = new FileOutputStream(out);
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
SecretKey sk = skf.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
if(cipherMode==Cipher.ENCRYPT_MODE) {
cipher.init(Cipher.ENCRYPT_MODE, sk,SecureRandom.getInstance("SHA1PRNG"));
CipherInputStream cis= new CipherInputStream(fis,cipher);
write(cis,fos);
}else if(cipherMode==Cipher.DECRYPT_MODE) {
cipher.init(Cipher.DECRYPT_MODE, sk,SecureRandom.getInstance("SHA1PRNG"));
CipherOutputStream cos= new CipherOutputStream(fos,cipher);
write(fis,cos);
}
}
private static void write(InputStream in, OutputStream out) throws IOException {
byte[] buffer= new byte[64];
int nobr;
while((nobr=in.read(buffer)) != -1) {
out.write(buffer,0,nobr);
}
out.close();
in.close();
}
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
a1 frame = new a1();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public a1() {
JTextField textField_1= new JTextField();
JTextField textField_2= new JTextField();
File in = new File(textField_1.getText());
File out = new File(textField_2.getText());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 452, 224);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JButton btnEncrypt = new JButton("Encrypt");
btnEncrypt.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try {
encDec("12345678",Cipher.ENCRYPT_MODE,in,out);
System.out.println("27la mesa");
} catch (InvalidKeyException | NoSuchAlgorithmException | InvalidKeySpecException | NoSuchPaddingException
| IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();}
}
});
btnEncrypt.setBounds(107, 151, 89, 23);
contentPane.add(btnEncrypt);
JButton btnDecrypt = new JButton("Decrypt");
btnDecrypt.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
encDec("12345678",Cipher.DECRYPT_MODE,in,out);
System.out.println("27la mesa");
} catch (InvalidKeyException | NoSuchAlgorithmException | InvalidKeySpecException | NoSuchPaddingException
| IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
btnDecrypt.setBounds(229, 151, 89, 23);
contentPane.add(btnDecrypt);
textField_1 = new JTextField();
textField_1.setBounds(79, 52, 216, 20);
contentPane.add(textField_1);
textField_1.setColumns(10);
textField_2 = new JTextField();
textField_2.setColumns(10);
textField_2.setBounds(79, 84, 216, 20);
contentPane.add(textField_2);
key_text = new JTextField();
key_text.setColumns(10);
key_text.setBounds(79, 21, 216, 20);
contentPane.add(key_text);
new JFileChooser();
JButton button = new JButton("select");
final JFileChooser fc1 = new JFileChooser();
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
fc1.setCurrentDirectory(new java.io.File("user.home"));
fc1.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
if (fc1.showOpenDialog(button) == JFileChooser.APPROVE_OPTION) {
textField_1.setText(fc1.getSelectedFile().toString());
}
}
});
button.setBounds(309, 52, 89, 23);
contentPane.add(button);
JButton button_1 = new JButton("select");
final JFileChooser fc2 = new JFileChooser();
button_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
fc2.setCurrentDirectory(new java.io.File("user.home"));
fc2.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
if (fc1.showOpenDialog(button) == JFileChooser.APPROVE_OPTION) {
textField_2.setText(fc1.getSelectedFile().toString());
}
}
});
button_1.setBounds(309, 83, 89, 23);
contentPane.add(button_1);
JLabel lblKey = new JLabel("key:");
lblKey.setBounds(23, 24, 46, 14);
contentPane.add(lblKey);
JLabel lblIn = new JLabel("in:");
lblIn.setBounds(23, 55, 46, 14);
contentPane.add(lblIn);
JLabel lblOut = new JLabel("out:");
lblOut.setBounds(23, 87, 46, 14);
contentPane.add(lblOut);
}
}
答案 0 :(得分：0)
在这些方面：
JTextField textField_1= new JTextField();
JTextField textField_2= new JTextField();
您正在创建新的本地对象，这些对象与您之前声明的对象不同。您应该将这些更改为：
textField_1= new JTextField();
textField_2= new JTextField();