Re: How do I write an ImageIcon object into a file on my computer?

From:
"phillip.s.powell@gmail.com" <phillip.s.powell@gmail.com>
Newsgroups:
comp.lang.java.help,comp.lang.java.programmer
Date:
16 Jan 2007 16:33:36 -0800
Message-ID:
<1168994015.242999.89220@l53g2000cwa.googlegroups.com>
Perhaps this will suit my needs (untested):

/*
 * FileDownloader.java
 *
 * Created on January 10, 2007, 3:47 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package FileTools;

import java.io.*;
import java.net.*;

/**
 *
 * @author ppowell-c
 */
public class FileDownloader implements Serializable {

    public static void download(URL url, File file) throws IOException
{
        InputStream in = url.openStream();
        FileOutputStream out = new FileOutputStream(file);
        byte[] b = new byte[1024];
        int len;
        while((len = in.read(b)) != -1) {
            out.write(b, 0, len);
        }
        out.close();
    }

    public static void download(String path, File file) throws
IOException {
    download(new URL(path), file);
    }

    public static void download(String path, Object contents) throws
IOException {
    ObjectOutputStream out = new ObjectOutputStream(new
FileOutputStream(path));
    out.writeObject(contents);
    out.close();
    }

}

phillip.s.powell@gmail.com wrote:

I want to create a file. Any kind of file, a .ico, .xls, .pdf,
.whatever, whose contents will be determined by my inserting them into
the file I create.

Just like in PHP @fread($fileID, $contents);

Phil

Knute Johnson wrote:

phillip.s.powell@gmail.com wrote:

I hope this makes it more clear:

*update* still fails, can't fix it this time..

Here are my methods

public static void toFile(File file, Object contents) throws
IOException {
        FileOutputStream out = new FileOutputStream(file);
        out.write(contents.toString().getBytes());
    }

    public static void toFile(String filePath, Object contents) throws
IOException {
        File file = new File(filePath);
        toFile(file, contents);
    }
}

I get this exception thrown:

file:\C:\Documents%20and%20Settings\me\stave.ico (The filename,
directory name, or volume label syntax is incorrect)

I have no idea what to do. All I want to do is create an icon at
C:/Documents and Settings/me called "stave.ico" with the contents
spawned within ImageIcon icon.

That's it.

Phil

Daniel Pitts wrote:

phillip.s.powell@gmail.com wrote:

I am about to throw in the towel on Java at this point! Too many
questions!

How in the world do you do this one (again, in my native PHP it's
extremely easy:

$fileID = @fopen('/path/to/your/new/file', 'wb');
if ($fileID) {
 @fputs($fileID,
file_get_contents('http://www.domain.com/someimage.jpg'));
 @fclose($fileID);
}


[snip]

    public static void download(URL url, File file) throws IOException
{
        InputStream in = url.openStream();
        FileOutputStream out = new FileOutputStream(file);
        byte[] b = new byte[1024];
        int len;
        while((len = in.read(b)) != -1) {
            out.write(b, 0, len);
        }
        out.close();
    }

    public static void toFile(File file, Object contents) throws
IOException {
        FileOutputStream out = new FileOutputStream(file);
        out.write(contents.getBytes());
    }
}

This of course fails, but I have absolutely no idea how to get the
ImageIcon object "contents" to write into the file "/path/to/my/file".

Phil

Hmm, are you trying to save an image (such as a jpeg or gif), or
actually trying to serialize the ImageIcon object to a file? It looks
like you are simply trying do download data from a URL (thats what your
PHP code does). your toFile method can not do that if you have just any
Object. Only certain ones allow you to get at the byte[] contents. If

What doesn't work about your download method?
Other than the fact that you forget call "in.close()" in a failsafe
manor (see below)
If that is all you really want to do, then it is the best way.
However, if you have an Image object, look into ImageIO:
<http://java.sun.com/j2se/1.5.0/docs/api/javax/imageio/ImageIO.html> It
might do what you want.

-- This is a safer way to save a binary file from a URL:

public static void download(URL url, File file) throws IOException {
    final InputStream in = url.openStream();
    try {
        final OutputStream out = new FileOutputStream(file);
        try {
            final byte[] b = new byte[1024];
            int len;
            while((len = in.read(b)) != -1) {
                out.write(b, 0, len);
             }
        } finally {
            out.close();
        }
    } finally {
        in.close();
    }
}


You are not being clear about what you want to do. If you want to read
an image file from the local disk or a URL, use ImageIO.read(). If you
want to display that image use your ImageIcon component to do that.
There is no more to it that that.

--

Knute Johnson
email s/nospam/knute/

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