From Forum Nokia Wiki

ID	...	Creation date	28 January 2009
Platform	S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition	Tested on devices	Emulator
Category	J2ME	Subcategory

Keywords (APIs, classes, methods, functions): textBox,Commndbutton,String,FileConnection

Overview

This article shows, how to write data to a file by using FileConnection API (JSR-75). This example MIDlet has a TextBox, where text can be entered. Then the text can be saved to readme.txt file, which is in this case created under Gallery's Images folder.

The full source code for a test MIDlet:

Source code: WriteMIDlet.java

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.file.*;
import javax.microedition.io.*;
import java.io.*;
 
public class WriteMIDlet extends MIDlet implements CommandListener {
    private TextBox textbox;
    private String photos = "fileconn.dir.photos";
    private Command saveCommand;
    private Command exitCommand;
    private String path;
 
    public void startApp() {
        textbox = new TextBox("WriteMIDlet", "", 1000, TextField.ANY);
        saveCommand = new Command("Save", Command.SCREEN, 1);
        exitCommand = new Command("Exit", Command.EXIT, 1);
        textbox.addCommand(saveCommand);
        textbox.addCommand(exitCommand);
        textbox.setCommandListener(this);
        Display.getDisplay(this).setCurrent(textbox);
        path = System.getProperty(photos);
    }
 
    public void pauseApp() {
    }
 
    public void destroyApp(boolean unconditional) {
    }
 
    private void saveFile(String path, String name) {
        try {
            String url = path + name;
            String string = textbox.getString();
            byte data[] = string.getBytes();
            FileConnection fconn = (FileConnection)Connector.open(url, Connector.READ_WRITE);
            if (!fconn.exists()) {
                fconn.create();
            }
            OutputStream ops = fconn.openOutputStream();
            ops.write(data);
            ops.close();
            fconn.close();
        }
        catch (IOException ioe) {
            System.out.println("IOException: "+ioe.getMessage());
        }
        catch (SecurityException se) {
            System.out.println("Security exception:" + se.getMessage());
        }
    } 
 
    public void commandAction(Command c, Displayable d) {
        if (c == saveCommand) saveFile(path, "readme.txt");
        if (c == exitCommand) this.notifyDestroyed();
    }    
}

See also

• How to list root file systems in Java ME
• How to list files and folders in Java ME
• How to read an image from Gallery in Java ME