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How to write data to a file in Java ME

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* [[How to list files and folders in Java ME]]
* [[How to list files and folders in Java ME]]
* [[How to read an image from Gallery in Java ME]]
* [[How to read an image from Gallery in Java ME]]
<!-- Translation --> [[pt:Como gravar dados em um arquivo em Java ME]]

Revision as of 05:28, 18 September 2012

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.

Article Metadata
Code Example
Installation file: WriteDataExample binaries
Tested with
Devices(s): Nokia C3-01, Nokia Asha 306, Nokia E7-00
Keywords: textBox,Commndbutton,String,FileConnection
Created: jarmlaht (28 Jan 2009)
Last edited: hamishwillee (18 Sep 2012)

Source code: WriteMIDlet.java

The full source code for a test MIDlet:

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);
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()) {
OutputStream ops = fconn.openOutputStream();
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

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