Java和jtextfield值

Question

I have jTextFields . If the user type tHe AET , the HOST and the PORT NUMBER in them, I need to save that permanently when he clicks on the save button. How can I do that with Java to display the values automatically every time I run my application?

Answer 1

You have many options.

You could save to a file .

PrintWriter pw = new PrintWriter(new File('myFile.txt'));
pw.printLine(textField.getText());

to read from file would be....

try (BufferedReader br = new BufferedReader(new FileReader(file))) {
    String line;
    while ((line = br.readLine()) != null) {
       // process the line.
    }
}

More information on files here

you could save to the users registry .

Preferences userPref = Preferences.userRoot();
userPref.put('textFieldKey', textField.getText());

to read from registry would be....

Preferences userPref = Preferences.userRoot();
userPref.get('textFieldKey', 'defaultValue');

More information on preferences/registry storage here

You could also save to a DB but this would require SQL knowledge.

Example and tut here

There is also the option of using serialization please see an example here