I am working with java. In my application i want to give facility to user to add and change image. I use open dialog box to select image, it will work properly i.e on button click open dialog is open select any image.
i want to store that selected image into specified folder (src/resources/ and that path stored into database, for furhter retrivation.
Please guide me to overcome from that problem.
Actual code:
private void btnImagenActionPerformed(java.awt.event.ActionEvent evt) {
int returnVal = ElegirImagen.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = ElegirImagen.getSelectedFile();
String nombre=ElegirImagen.getSelectedFile().getName();
String sname = file.getAbsolutePath();
BufferedImage myPicture=null;
try {
myPicture = ImageIO.read(new File(sname));
} catch (IOException ex) {
Logger.getLogger(Videoteca.class.getName()).log(Level.SEVERE, null, ex);
}
lblImg.setIcon(new ImageIcon(myPicture));
lblImg.repaint();
BufferedImage i = new BufferedImage(300,500,BufferedImage.TYPE_INT_ARGB);
File fichero = new File(sname);
String formato = "jpg";
try {
ImageIO.write(i, formato, fichero);
} catch (IOException ex) {
Logger.getLogger(Videoteca.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
Swing has single threading model. All generated Events are also processed by a single Queue known as EventQueue inside one single thread known as EDT(Event Dispatch Thread). Action Event is also no exception. You should not read and write file inside this thread. Rather create a new thread using the means of Anonymous class or extending Runnable and deploy your image read-write operation there.
Though it is not clear from what you are asking, but i assume that you are probably after writing an image. ImageIO has write function too to write an image file. Check out Writing/Saving an Image tutorial which contains enough description.
Related
I am working on a project for my course and have been asked to show an associated image for products in a system, the user can add products, and he enters the name of the image file whilst doing so. the program then finds the image file and displays it with the product information.
I would like to add some additional code so that if there is no image file matching the string input that a standard image is shown. The code I have so far either shows the image file if it is found or does not show anything. can someone show me how to modify it so that it can show a standard image if no associated image file is found. the standard image is simply "no-image-found.jpg". Here is the code:
public void showImage(JLabel imageArea, String image){
BufferedImage img = null;
try {
img = (BufferedImage)ImageIO.read(new File(image));
Image actualimage = img.getScaledInstance(imageArea.getWidth(), imageArea.getHeight(), 0);
imageArea.setIcon(new ImageIcon(actualimage));
}
catch (IOException e) {
System.out.println(e.getMessage());
}
}
any help is very much appreciated, and my sincere apologies if this is a noob question, I am quite new to java.
In the catch, you could load the standard image and show it
Basically check for image existence assuming path is valid otherwise get the standard image. You can have something similar:
public void showImage(JLabel imageArea, String image)
{
BufferedImage img = null;
try
{
file = new File(image);
if (file.exists())
{
img = ImageIO.read(file);
}
else
{
file = new File(standardImagePath);
img = ImageIO.read(file);
}
Image actualimage = img.getScaledInstance(imageArea.getWidth(), imageArea.getHeight(), 0);
imageArea.setIcon(new ImageIcon(actualimage));
}
catch (IOException e)
{
System.out.println(e.getMessage());
}
I'm trying to make a program that asks the user for information and then when they click save, the text boxes and labels and all are saved into a file to be able to be shared. It could be any type of file if need be. The information is in a Tabbed pane inside a JFrame. Here is my current save method.
FileFilter ft = new FileNameExtensionFilter("Text Files", "txt", "jpg","png", "jpeg");
db.addChoosableFileFilter(ft);
int returnVal = db.showSaveDialog(this);
if (returnVal == javax.swing.JFileChooser.APPROVE_OPTION) {
java.io.File saved_file = db.getSelectedFile();
String file_name = saved_file.toString();
try {
WriteFile data = new WriteFile(file_name, false);
String allText = JFrame.toString(); //Line im having trouble with
data.writeToFile(allText);
} catch (java.io.IOException e) {
System.out.println(e.getMessage());
}
}
JFrame.toString wont give you any state that you want to save.
The right approach is to get each value from text boxes and save/reload manually into a file.
Another approach that you can try, is to serialize the whole JFrame into a file. Look at this JavaDoc for more info.
I'm trying to load an image from an executable JAR file.
I've followed the information from here, then the information from here.
This is the function to retrieve the images:
public static ImageIcon loadImage(String fileName, Object o) {
BufferedImage buff = null;
try {
buff = ImageIO.read(o.getClass().getResource(fileName));
// Also tried getResourceAsStream
} catch (IOException e) {
e.printStackTrace();
return null;
}
if (buff == null) {
System.out.println("Image Null");
return null;
}
return new ImageIcon(buff);
}
And this is how it's being called:
logo = FileConverter.loadImage("/pictures/Logo1.png", this);
JFrame.setIconImage(logo.getImage());
With this being a simple Object.
I'm also not getting a NullPointerException unless it is being masked by the UI.
I checked the JAR file and the image is at:
/pictures/Logo1.png
This current code works both in eclipse and when it's been exported to a JAR and run in a terminal, but doesn't work when the JAR is double clicked, in which case the icon is the default JFrame icon.
Thanks for you're help. It's probably only me missing something obvious.
I had a similar problem once, which turned out to be down to issues relative addressing and my path being in the wrong place somehow. I dug this out of some old code I wrote that made it use an absolute path. That seemed to fix my problem; maybe it will work for you.
String basePath = (new File(".")).getAbsolutePath();
basePath = basePath.substring(0, basePath.length()-1);
FileConverter.loadImage(basePath+"/pictures/Logo1.png", this);
BACKGROUND
Hey so I have a camera that I have implemented myself in code. This means I access and control the camera hardware and use it to save pictures. I can save the picture using the Camera.takePicture() function when the camera is running: running means Camera.startPreview();
PROBLEM
My problem is that I want to be able to save the image also when the camera image is frozen: frozen is when Camera.stopPreview(); is called.When frozen I can see the image in my layout but how do I access it? Where is the image saved so that I might be able to modify it later?
Thanks in advance!
------------------Update 1
jpeg bla;
public class jpeg implements PictureCallback{
public void onPictureTaken(byte[] data, Camera camera) {
g_data = data;
}
}
This is part of my code. Here I am trying to write the data that would originally be saved to a global variable. However the value of g_data remains null and I am unable to set a breakpoint inside the onPictureTaken() call back function.
------------------Update 2
FileOutputStream outStream = null;
try {
// generate the folder
File imagesFolder = new File(Environment.getExternalStorageDirectory(), "MirrorMirror");
if( !imagesFolder.exists() ) {
imagesFolder.mkdirs();
}
// generate new image name
SimpleDateFormat formatter = new SimpleDateFormat("HH_mm_ss");
Date now = new Date();
String fileName = "image_" + formatter.format(now) + ".jpg";
// create outstream and write data
File image = new File(imagesFolder, fileName);
outStream = new FileOutputStream(image);
outStream.write(data);
outStream.close();
Log.d(TAG, "onPictureTaken - wrote bytes: " + data.length);
} catch (FileNotFoundException e) { // <10>
//Toast.makeText(ctx, "Exception #2", Toast.LENGTH_LONG).show();
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {}
I used this code previously to save the file from the camera onPictureTaken() function. The key here is the byte[] data which I need to save and save later. However like I said I just get a null when I check it in the debugger.
Camera.takePicture never looks at the view you specified as previewDisplay. Actually, it isn't an ImageView, but a SurfaceView, and there are no API to read pixels from it.
You can call takePicture() preemptively just before you stopPreview(). Later, if you find out that you don't need the picture, just discard it.
Ok so the exact way to do this is to take the picture just before stopPreview() and save it to a temporary file. Actually with this implementation you never call stopPreview()(otherwise it will crash) since the takePicture() function stops the preview automatically.
try {
File temp = File.createTempFile("temp", ".jpg");
} catch (IOException e) {
e.printStackTrace();
}
Now that we have the temporary file saved we will access it later and move it to our new desired file location.
How to copy file.
temp.deleteOnExit();
be sure to call deleteonExit() so that Android deletes the file after the app is closed(if so desired).
I'm new here and kinda new to java.
I've encountered a problem.
I have a very simple program that tries to create pngs and save them in a user selected folder.
byteimage is a a private byte[]:
byteimage = bcd.createPNG(300, 140, ColorSpace.TYPE_RGB, Color.BLACK, Color.BLACK);
setPath() is called inside the action listener of the browse button
private void setPath() {
JFileChooser pathchooser = new JFileChooser();
pathchooser.setMultiSelectionEnabled(false);
pathchooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
pathchooser.setApproveButtonMnemonic(KeyEvent.VK_ENTER);
pathchooser.showDialog(this, "OK");
File f = pathchooser.getSelectedFile();
if (f != null) {
filepath = f.getAbsolutePath();
pathfield.setText(filepath);
}
}
Byte to png method looks like this:
public void byteToPNG(String filename) {
try {
InputStream in = new ByteArrayInputStream(byteimage);
BufferedImage bufferedimg = ImageIO.read(in);
ImageIO.write(bufferedimg, "png", new File(filename));
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
This method is called like this:
byteToPNG(pathfield.getText() + System.getProperty("file.separator") + textfield.getText() + ".png");
textfield.getText() sets the actual name of the png.
Inside the constructor, default filepath is set:
filepath = System.getProperty("user.dir");
pathfield.setText(filepath);
The code runs fine from Eclipse and it produces a png image at the desired location.
Unfortunately, after exporting as jar, it starts but when the button for generating the png is pressed, nothing happens. I'm thinking there's a problem at InputStream or BufferedImage, but I'm a bit puzzled.
If the String fileName passed to byteToPNG isn't absolute (i.e. written in the form "C:/foo/bar/etc") that could be the cause of the broken jar. You could also try running the jar file in the terminal using the command:
java -jar myJarFile.jar.
This will cause a console window to remain open alongside your running jar application in which all your applications output (including any exceptions) will be printed.