Hi all,
I have following code... How do i save the image to the file in my local hard drive?

try {
// Create a URL for the image's location
java.net.URL url = new java.net.URL(jTextFieldURL.getText());

// Get the image
java.awt.Image image = java.awt.Toolkit.getDefaultToolkit().getDefaultToolkit().createImage(url);

} catch (java.net.MalformedURLException e) {
System.out.println(e.toString());
} catch (java.io.IOException e) {
System.out.println(e.toString());
}

 

 

Here's an example. Modify it for your own needs.

import java.net.*;
import java.io.*;
public
class ImageDownload
{
  public static void main(String[] args)
  throws Exception
  {
    // url to image
    URL url = new URL(args[0]);
    // input from image
    InputStream in = new BufferedInputStream(url.openStream());
    // downloaded bytes
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    // output file
    RandomAccessFile file = new RandomAccessFile("image","rw");
    // download buffer
    byte[] buffer = new byte[4096]; 
 
    // download the bytes
    for (int read=0;(read=in.read(buffer))!=-1;out.write(buffer,0,read));
    // write all data out to the file
    file.write(out.toByteArray());
    // close file
    file.close();
  }
}

 

 

try something like this....

    Object object = /// your image    
    try {
        // Serialize to a file
        ObjectOutput out = new ObjectOutputStream(new FileOutputStream("filename.ser"));
        out.writeObject(object);
        out.close();
    
        // Serialize to a byte array
        ByteArrayOutputStream bos = new ByteArrayOutputStream() ;
        out = new ObjectOutputStream(bos) ;
        out.writeObject(object);
        out.close();
    
        // Get the bytes of the serialized object
        byte[] buf = bos.toByteArray();
    } catch (IOException e) {
    }

 

 

Yo DevMentee,


I just had a question for you: does this work for images? I can't find anything about the java.awt.Image being Serializable. I also get strange errors:

~ $ java -classpath . ImageDownload file:///home/bhun/image.gif
Exception in thread "main" java.io.IOException: failed to load image contents
        at javax.swing.ImageIcon.writeObject(ImageIcon.java:415)

and

~ $ java -classpath . ImageDownload http://developer.java.sun.com/images/v4_java_logo.gif
Exception in thread "main" java.io.IOException: failed to load image contents
        at javax.swing.ImageIcon.writeObject(ImageIcon.java:415)

 

 

I ran nuhb's code and it works.

 

 

Yo! it probably is not.......I didn't try it with image (sorry!) but 99% of the time it works with other object types.....does your solution work well with images????

 

 

Well, it's all bytes anyway. I just save the original byte data. You can also get Serialization to work if you subclass ImageIcon and do override the Serialization (I guess). It's a pity it doesn't work with serialization (the ImageIcon).

Greets

 

 

Hi nuhb,

thanks for your help. I have modify the code you gave, and I was able to get the file(image *.jpg) from the URL given. However, It doesn't work with the large file. I was able to get the file where the file size is 58KB or less, but it only save 18KB size when i download the file which it size is 485KB.

I try to trace the exception, but it doesn't gave me any exception.
Is url.openStream() has limitation on the size??? Or do i need to compress the stream/file before download???

below is the byte read when i trace the code (actual file size = 485KB) :

read : 2633
read : 4096
read : 284
read : 4096
read : 284
read : 4096
read : 284
read : 2471

read : -1 -- quite the loop and continue to write the file.

total byte save =18244 or 18KB only....

 

 

I tested it with a 280k file and it downloaded the whole thing.

 

 

hi nuhb & ahaweb,

I discover that for some of the URL, i can download the file > 1150KB, but for some URL, it doesn't download complet byte....

Is in = new BufferedInputStream(url.openStream()); depends on the url connection? any restriction when getting the InputStream? or any time out for getting InputStream? How can i check whether url.openStream() returning complete InputStream?

Sorry to ask so many question as I'm quite new to the URL & Stream read & write....

Thanks for your help and explaination.

 

 

List the URL's that don't work.

 

 

hi nuhb & ahaweb,

It was my mistake on the URL. It should be the html file but i save it as the JPG file. This happen because when I manually enter the URL, the browser will redirect it to another html page instead of bring me to the JPG file. I change the file extension to *.htm, I can see the content of the html.

Sorry my mistake. Thoudsand of appolozes :-P.

Thanks for helping.

 

 

Hi all... back to this issue again...

How can i avoid this to happen :

When I manually enter the URL(url for the image .jpg), the browser will redirect it to another html page instead of bring me to the JPG file. But if i follow the link from the browser, it bring me to the correct site/url and i can right click the image and save it to my local drive.

How java can directly connect to the URL without redirect it to another html page.

I using the follwoing method :

URL urlSource = new URL(as_url);
URLConnection urlSourceCon = urlSource.openConnection();

example url : http://www23.smutserver.com/asian/avidols/hsuchi/pix/hcpic327.jpg


thanks in advance for help :-)

 

 

Hi all... back to this issue again...

How can i avoid this to happen :

When I manually enter the URL(url for the image .jpg), the browser will redirect it to another html page instead of bring me to the JPG file. But if i follow the link from the browser, it bring me to the correct site/url and i can right click the image and save it to my local drive.

How java can directly connect to the URL without redirect it to another html page.

I using the follwoing method :

URL urlSource = new URL(as_url);
URLConnection urlSourceCon = urlSource.openConnection();

example url : http://www23.smutserver.com/asian/avidols/hsuchi/pix/hcpic326.jpg


thanks in advance for help :-)