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

P

phillip.s.powell

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);
}

That's it. Now, how on earth do I do that in Java???

I tried something like this but just fell apart on it:

/*
* 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 {

/** Creates a new instance of FileDownloader */
public FileDownloader() {}

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
 
D

Daniel Pitts

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
Click to expand...
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();
}
}
 
P

phillip.s.powell

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 said:
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
Click to expand...
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();
}
}
Click to expand...
 
K

Knute Johnson

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 said:
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
Click to expand...
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();
}
}
Click to expand...
Click to expand...

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.
 
P

phillip.s.powell

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 said:
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 said:
(e-mail address removed) 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();
}
}
Click to expand...
Click to expand...

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.
Click to expand...
 
P

phillip.s.powell

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();
}


}

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 said:
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:
(e-mail address removed) 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();
}
}
Click to expand...

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.
Click to expand...
Click to expand...
 
T

Thomas Fritsch

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);
Click to expand...
I assume you got the Exception in the line above.
(Unfortunately you missed to post the complete exception stack trace)
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)
Click to expand...
The exception says it all: You try to open a file in directory
file:\C:\Documents%20and%20Settings\me
which, of course, doesn't exist.
What you really want to do, is to open a file in directory
C:\Documents and Settings\me
I.e. you have to use
C:\Documents and Settings\me\stave.ico
as filePath in your code above.
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.
Click to expand...

Don't confuse URL strings like
file:\C:\Documents%20and%20Settings\me\stave.ico
with real Windows file paths like
C:\Documents and Settings\me\stave.ico
 
K

Knute Johnson

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();
}


}

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 said:
(e-mail address removed) 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:
(e-mail address removed) 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.
Click to expand...
Click to expand...
Click to expand...

Well I don't have a clue about PHP but if it works so well why don't you
just use it?

Java Objects are not all Serializable. For example the Image object is
not. You can't do ObjectInputStream/OutputStream operations if they are
not Serializable.

You can certainly read the data bytes from the InputStream of the URL
and save those bytes to a file. In fact your code to do that looks fine.

So to ask the question again, in what format is your data? Is it in
some file format or is it Java Objects?
 
P

phillip.s.powell

Thomas said:
I assume you got the Exception in the line above.
(Unfortunately you missed to post the complete exception stack trace)

The exception says it all: You try to open a file in directory
file:\C:\Documents%20and%20Settings\me
which, of course, doesn't exist.
What you really want to do, is to open a file in directory
C:\Documents and Settings\me
I.e. you have to use
C:\Documents and Settings\me\stave.ico
as filePath in your code above.
Click to expand...

Then perhaps this might be a better choice:

/*
* 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 {

/** Creates a new instance of FileDownloader */
public FileDownloader() {}

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();
}


}

What do you think?

Phil
 
K

Knute Johnson

Then perhaps this might be a better choice:

/*
* 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 {
Click to expand...
Why is it Serializable? There is no data.
/** Creates a new instance of FileDownloader */
public FileDownloader() {}
This method is fine.
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);
}
Click to expand...
This will work only if the Object is Serializable
public static void download(String path, Object contents) throws
IOException {
ObjectOutputStream out = new ObjectOutputStream(new
FileOutputStream(path));
out.writeObject(contents);
out.close();
}


}

What do you think?
Click to expand...

I think you aren't listening.
 
P

phillip.s.powell

Knute said:
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();
}


}

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:
(e-mail address removed) 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:
(e-mail address removed) 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.
Click to expand...

Well I don't have a clue about PHP but if it works so well why don't you
just use it?

Java Objects are not all Serializable. For example the Image object is
not. You can't do ObjectInputStream/OutputStream operations if they are
not Serializable.

You can certainly read the data bytes from the InputStream of the URL
and save those bytes to a file. In fact your code to do that looks fine.

So to ask the question again, in what format is your data? Is it in
some file format or is it Java Objects?

--
Click to expand...


Any format whatsoever. Can be .txt, can be .xls, can be .whatever. It
can be anything on the planet. If it could be a solid actual object it
would be that too.
Click to expand...
 
P

phillip.s.powell

Knute said:
Then perhaps this might be a better choice:

/*
* 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 {
Click to expand...
Why is it Serializable? There is no data.
/** Creates a new instance of FileDownloader */
public FileDownloader() {}
This method is fine.
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);
}
Click to expand...
This will work only if the Object is Serializable
public static void download(String path, Object contents) throws
IOException {
ObjectOutputStream out = new ObjectOutputStream(new
FileOutputStream(path));
out.writeObject(contents);
out.close();
}


}

What do you think?
Click to expand...

I think you aren't listening.
Click to expand...

Maybe you need to explain it to someone with ADD as if I were a 10-year
old. Try it that way.

How do you write to a new file anything, like String content or Image
content or Excel spreadsheet content.. anything at all, into a new
file? How do you do it?

Phil
 
K

Knute Johnson

Maybe you need to explain it to someone with ADD as if I were a 10-year
old. Try it that way.

How do you write to a new file anything, like String content or Image
content or Excel spreadsheet content.. anything at all, into a new
file? How do you do it?

Phil
Click to expand...

String data is written with a Writer, Object data is written with an
ObjectOutputStream and byte data is written with an OutputStream.

Where is your data coming from?

The web?

A file on a disk?

A Java program?

Is it a byte stream?
 
R

RedGrittyBrick

Knute said:
String data is written with a Writer, Object data is written with an
ObjectOutputStream and byte data is written with an OutputStream.

Where is your data coming from?

The web?

A file on a disk?

A Java program?

Is it a byte stream?
Click to expand...

I shouldn't really jump in and answer the question for the OP but there
seems to be an impedance mismatch in the communications channel.

AIUI the OP wants

a) Use HTTP to obtain an image from a website somewhere.
e.g. http://foo.example.com/img/frog.jpg

b) Write the obtained data to a local disk file in such a way that it
constitutes a valid image file that can be read by common image viewing
and editing software. e.g. to c:\frog.jpg as a valid JPEG image file.

I don't think he cares how the data is temporarily represented in Java.

Followups set to comp.lang.java.help only (dropping .programmer)
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Similar Threads

How do I save information from an GUI into a XML-file? 0
How can I upload a tar.bz2 file to OpenStack swift object storage container using the Python swift client? 2
How to convert ImageIcon to read/write it on db 0
hello here is a copy of a copy program on the net . 6
how do I read and write a file using UTF8? 12
Memory Leak in a multi threaded java application (ImageIcon) 1
How to remove an empty line which is created when i deleted a element from my xml file? 0
Reading into a buffer and writing from it at the same time 8

Members online

Total: 79 (members: 2, guests: 77)
Robots: 155

Forum statistics

Threads
473,982
Messages
2,570,189
Members
46,735
Latest member
HikmatRamazanov

Latest Threads

Top