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我正在做一個簡單的程序,需要一個用戶名和密碼,並將其保存到一個文本文件。然而,程序工作正常,直到我檢查硬盤驅動器。文本文件在那裏沒有文本。緩衝作家不寫文本?
public class Main {
public static void main(String args[]){
events jack = new events();
events gui = new events();
gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
gui.setTitle("WCPSS");
gui.setSize(1100,400);
gui.setVisible(true);
gui.setLocationRelativeTo(null);
BufferedWriter bw = null;
try {
//Specify the file name and path here
File file = new File("E:/myfile.txt");
/* This logic will make sure that the file
* gets created if it is not present at the
* specified location*/
if (!file.exists()) {
file.createNewFile();
}
FileWriter fw = new FileWriter(file);
bw = new BufferedWriter(fw);
bw.write(jack.username);
System.out.println("File written Successfully");
} catch (IOException ioe) {
ioe.printStackTrace();
}
finally
{
try{
if(bw!=null)
bw.close();
}catch(Exception ex){
System.out.println("Error in closing the BufferedWriter"+ex);
}
}
}
}
public class events extends JFrame {
public String username = ("");
public String password = ("");
private JLabel label;
private JButton button;
private JTextField userin = new JTextField(10);
private JTextField userpass = new JTextField(10);
public events() {
setLayout(new FlowLayout());
button = new JButton("Submit");
button.setBounds(5, 435, 50, 123);
add(button);
label = new JLabel(
"Please enter your username and password : ");
add(label);
add(userin);
add(userpass);
button.addActionListener((e) -> {
sumbitAction();
});
}
private void sumbitAction() {
username = userin.getText();
password = userpass.getText();
System.out.println(username);
System.out.println(password);
}
}
我知道這可能是writen很差,但我是一個初學者,並會apperticate一些幫助。謝謝
那麼,你寫'jack.username','jack.username'是一個空字符串,所以這是預期的,不是嗎?只有當用戶決定按下按鈕時,用戶名纔會變得很長。 –