Save image to file in applet?

Question

So, here’s what I’m doing, I’m trying to make an applet for a web game to create “ordinary” avatars, this avatar is to some extent from the country's army, so the avatar will touch the image of the user and the frame in the image thtat represent the square to which belongs user.

So my plan is to get them to select from a file from their computer, and then select the squd to which they belong. After that, they will see a picutre preview, and they will be able to save it on their computer in order to subsequently use it in the game.

I know that you can draw an image using Graphic or Graphic2D against the background of the component, but then when I want to save it to a file, how do I do it?

Answer 1

Use JFileChooser#showSaveDialog()to ask the user to select / specify the file to save, and then use ImageIO#write()to write BufferedImageto the file.

JFileChooser fileChooser = new JFileChooser();
if (fileChooser.showSaveDialog(null) == JFileChooser.APPROVE_OPTION) {
    ImageIO.write(bufferedImage, "JPEG", fileChooser.getSelectedFile());
} else {
    // User pressed cancel.
}

However, applets must be signed to avoid the fear of a safety warning user.

Answer 2

An applet deployed using the JRE Plug-In 2 architecture (PI2 - 1.6.0_10 +) does not require digital code encryption. In the PI2 JRE, the embedded applet can access all services available only to Java Web Start applications.

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Answer 3

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/*Arpana*/

mport javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.Scanner;

import java.io.*;



public class Notepad extends JFrame implements ActionListener {

    private TextArea textArea = new TextArea("", 0,0, TextArea.SCROLLBARS_VERTICAL_ONLY);

    private MenuBar menuBar = new MenuBar(); // first, create a MenuBar item

    private Menu file = new Menu(); // our File menu

    // what going in File? let see...

    private MenuItem openFile = new MenuItem();  // an open option

    private MenuItem saveFile = new MenuItem(); // a save option

    private MenuItem close = new MenuItem(); // and a close option!



    public Notepad() {

        this.setSize(500, 300); // set the initial size of the window

       this.setTitle("Java Notepad Tutorial"); // set the title of the window

        setDefaultCloseOperation(EXIT_ON_CLOSE); // set the default close operation (exit when it gets closed)

        this.textArea.setFont(new Font("Century Gothic", Font.BOLD, 12)); // set a default font for the TextArea

        // this is why we didn't have to worry about the size of the TextArea!

        this.getContentPane().setLayout(new BorderLayout()); // the BorderLayout bit makes it fill it automatically

        this.getContentPane().add(textArea);



        // add our menu bar into the GUI

        this.setMenuBar(this.menuBar);

        this.menuBar.add(this.file); // we'll configure this later



        // first off, the design of the menuBar itself. Pretty simple, all we need to do

       // is add a couple of menus, which will be populated later on

        this.file.setLabel("File");



        // now it time to work with the menu. I'm only going to add a basic File menu

        // but you could add more!



        // now we can start working on the content of the menu~ this gets a little repetitive,

      // so please bare with me!



        // time for the repetitive stuff. let add the "Open" option

        this.openFile.setLabel("Open"); // set the label of the menu item

        this.openFile.addActionListener(this); // add an action listener (so we know when it been clicked

        this.openFile.setShortcut(new MenuShortcut(KeyEvent.VK_O, false)); // set a keyboard shortcut

        this.file.add(this.openFile); // add it to the "File" menu



        // and the save...

        this.saveFile.setLabel("Save");

        this.saveFile.addActionListener(this);

        this.saveFile.setShortcut(new MenuShortcut(KeyEvent.VK_S, false));

        this.file.add(this.saveFile);



        // and finally, the close option

        this.close.setLabel("Close");

        // along with our "CTRL+F4" shortcut to close the window, we also have

      // the default closer, as stated at the beginning of this tutorial.

        // this means that we actually have TWO shortcuts to close:

        // 1) the default close operation (example, Alt+F4 on Windows)

        // 2) CTRL+F4, which we are about to define now: (this one will appear in the label)

        this.close.setShortcut(new MenuShortcut(KeyEvent.VK_F4, false));

        this.close.addActionListener(this);

        this.file.add(this.close);

    }



    public void actionPerformed (ActionEvent e) {

        // if the source of the event was our "close" option

        if (e.getSource() == this.close)

            this.dispose(); // dispose all resources and close the application



        // if the source was the "open" option

        else if (e.getSource() == this.openFile) {

            JFileChooser open = new JFileChooser(); // open up a file chooser (a dialog for the user to browse files to open)

            int option = open.showOpenDialog(this); // get the option that the user selected (approve or cancel)

            // NOTE: because we are OPENing a file, we call showOpenDialog~

            // if the user clicked OK, we have "APPROVE_OPTION"

            // so we want to open the file

            if (option == JFileChooser.APPROVE_OPTION) {

                this.textArea.setText(""); // clear the TextArea before applying the file contents

                try {

                    // create a scanner to read the file (getSelectedFile().getPath() will get the path to the file)

                    Scanner scan = new Scanner(new FileReader(open.getSelectedFile().getPath()));

                    while (scan.hasNext()) // while there still something to read

                        this.textArea.append(scan.nextLine() + "\n"); // append the line to the TextArea

                } catch (Exception ex) { // catch any exceptions, and...

                    // ...write to the debug console

                    System.out.println(ex.getMessage());

                }

            }

        }



        // and lastly, if the source of the event was the "save" option

        else if (e.getSource() == this.saveFile) {

            JFileChooser save = new JFileChooser(); // again, open a file chooser

            int option = save.showSaveDialog(this); // similar to the open file, only this time we call

            // showSaveDialog instead of showOpenDialog

            // if the user clicked OK (and not cancel)

            if (option == JFileChooser.APPROVE_OPTION) {

                try {

                    // create a buffered writer to write to a file

                    BufferedWriter out = new BufferedWriter(new FileWriter(save.getSelectedFile().getPath()));

                  out.write(this.textArea.getText()); // write the contents of the TextArea to the file

                    out.close(); // close the file stream

                } catch (Exception ex) { // again, catch any exceptions and...

                    // ...write to the debug console

                    System.out.println(ex.getMessage());

                }

            }

        }

    }

    // the main method, for actually creating our notepad and setting it to visible.

    public static void main(String args[]) {

      Notepad app = new Notepad();

        app.setVisible(true);

}

}

Answer 4

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Answer 5

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