How to write data to a file in Java ME
m (added Java ME category) |
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The full source code for a test MIDlet: | The full source code for a test MIDlet: | ||
| − | WriteMIDlet.java | + | ==Source code: WriteMIDlet.java== |
<code java> | <code java> | ||
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} | } | ||
</code> | </code> | ||
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| + | ==See also== | ||
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| + | * [http://wiki.forum.nokia.com/index.php/How_to_list_root_file_systems_in_Java_ME How to list root file systems in Java ME] | ||
| + | * [http://wiki.forum.nokia.com/index.php/How_to_list_files_and_folders_in_Java_ME How to list files and folders in Java ME] | ||
| + | * [http://wiki.forum.nokia.com/index.php/How_to_read_an_image_from_Gallery_in_Java_ME How to read an image from Galler in Java ME] | ||
Revision as of 16:03, 26 January 2009
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();
}
}
