How to copy image in java using bufferedreader/writer

Question

    File file = new File("download.png");
    File newfile = new File("D:\\Java.png");
    BufferedReader br=null;
    BufferedWriter bw=null;
    try {
        FileReader fr = new FileReader(file);
        FileWriter fw = new FileWriter(newfile);
        br = new BufferedReader(fr);
        bw = new BufferedWriter(fw);
        char[] buf = new char[1024];
        int bytesRead;
        while ((bytesRead = br.read(buf)) > 0) {
            bw.write(buf, 0, bytesRead);
        }
        bw.flush();
        }
        catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            br.close();
        bw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        }

Whats wrong with this code. Is it possible with BufferedReader and Writer Class?? I know how to to make copy of image using InputStream and OutputStream, So don't paste solution using that!!

Possible duplicate of [How do you clone a BufferedImage](http://stackoverflow.com/questions/3514158/how-do-you-clone-a-bufferedimage) — hB0, Feb 16 '17 at 19:46
The short answer is that you can't. Reader and Writer APIs are for text, and images are not text. — Stephen C, Jan 13 '18 at 23:08

Jon Skeet · Accepted Answer · 2017-02-16T16:05:23.757

5

Whats wrong with this code.

You're using text-based classes for binary data.

Is it possible with BufferedReader and Writer Class?

Not while you're dealing with binary data, no.

I know how to to make copy of image using InputStream and OutputStream, So don't paste solution using that!

That's the solution you should use, because those are the classes designed for binary data.

Fundamentally, using Reader or Writer for non-text data is broken, and asking for trouble. If you open up the file in a text editor and don't see text, it's not a text file... (Alternatively, it could be a text file that you're using the wrong encoding for, but things like images and sound aren't naturally text.)

edited Feb 16 '17 at 16:05

answered Feb 16 '17 at 15:57

Jon Skeet

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1

Also would like to ask if video is also read in binary form(binary data)?? – Rajat Gupta Feb 16 '17 at 16:01
4

@RajatGupta: Yes, absolutely. What text would you expect to see if you opened it up in Notepad? – Jon Skeet Feb 16 '17 at 16:04

score -1 · Answer 2 · edited Feb 21 '17 at 08:15

-1

Use javax.imageio.ImageIO utility class, which has lots of utility method related to images processing.

try{
    File imagefile = new File("download.png");
    BufferedImage image = ImageIO.read(imagefile);
    ImageIO.write(image, "png",new File("D:\\Java.png"));
    .....
}

edited Feb 21 '17 at 08:15

Jad Chahine

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answered Feb 16 '17 at 16:53

Avaneesh

162
5

That will change the image. It’s better to copy the bytes instead of involving ImageIO. Also, it keeps the entire image in memory, which means it won’t work with very large images. – VGR Jan 14 '18 at 02:35

How to copy image in java using bufferedreader/writer

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