How to write data to a file in Java ME
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| − | [[Category:Java ME]][[Category:How To]][[Category:Code Examples]][[Category:Files/Data]][[Category:File Connection and PIM API (JSR-75)]] | + | [[Category:Java ME]][[Category:How To]][[Category:Code Examples]][[Category:Files/Data]][[Category:File Connection and PIM API (JSR-75)]][[Category:Series 40]][[Category:Symbian]][[Category:S60 3rd Edition FP1]][[Category:S60 3rd Edition FP2]][[Category:S60 5th Edition]][[Category:Series 40 6th Edition FP1]][[Category:Series 40 Developer Platform 2.0]][[Category:Nokia Belle]] |
{{Abstract|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.}} | {{Abstract|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.}} | ||
{{ArticleMetaData | {{ArticleMetaData | ||
| − | | | + | |devices= Nokia C3-01, Nokia Asha 306, Nokia E7-00 |
| − | | | + | |platform= S40, S60, Nokia Belle |
|creationdate=20090128 | |creationdate=20090128 | ||
|keywords=textBox,Commndbutton,String,FileConnection | |keywords=textBox,Commndbutton,String,FileConnection | ||
| − | |sourcecode= | + | |sourcecode=[[Media:WriteDataExample_src.zip | WriteDataExample sources]] |
| − | |installfile= | + | |installfile= [[Media:WriteDataExample_bin.zip | WriteDataExample binaries]] |
| − | |sdk= | + | |sdk= [http://www.developer.nokia.com/Develop/Java/ Nokia SDK 1.1 for Java], [http://www.developer.nokia.com/Develop/Java/ Nokia SDK 2.0 for Java (beta)], [http://www.developer.nokia.com/info/sw.nokia.com/id/ec866fab-4b76-49f6-b5a5-af0631419e9c/S60_All_in_One_SDKs.html/ Nokia Symbian SDKs] |
|devicecompatability=<!-- Compatible devices (e.g.: All* (must have GPS) ) --> | |devicecompatability=<!-- Compatible devices (e.g.: All* (must have GPS) ) --> | ||
|signing=<!-- Empty or one of Self-Signed, DevCert, Manufacturer --> | |signing=<!-- Empty or one of Self-Signed, DevCert, Manufacturer --> | ||
Revision as of 10:06, 17 August 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
Source file: WriteDataExample sources
Installation file: WriteDataExample binaries
Tested with
Devices(s): Nokia C3-01, Nokia Asha 306, Nokia E7-00
Compatibility
Platform(s): S40, S60, Nokia Belle
Article
Keywords: textBox,Commndbutton,String,FileConnection
Created: jarmlaht
(28 Jan 2009)
Last edited: trashedDev
(17 Aug 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);
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();
}
}

