how to convert image to byte array in java

Question

I want to convert an image to byte array and vice versa  Here  the user will enter the name of the image   jpg  and program will read it from the file and will convert it to a byte array

User · Answer

Check out javax imageio  especially ImageReader and ImageWriter as an abstraction for reading and writing image files   BufferedImage getRGB int x  int y  than allows you to get RGB values on the given pixel  which can be chunked into bytes   Note  I think you don t want to read the raw bytes  because then you have to deal with all the compression decompression

User · Answer

Using RandomAccessFile would be simple and handy   RandomAccessFile f   new RandomAccessFile filepath   r    byte   bytes   new byte  int  f length     f read bytes   f close

User · Answer

java io FileInputStream is what you re looking for  -

User · Answer

File fnew new File   tmp rose jpg    BufferedImage originalImage ImageIO read fnew   ByteArrayOutputStream baos new ByteArrayOutputStream    ImageIO write originalImage   jpg   baos    byte   imageInByte baos toByteArray

User · Answer

Here is a complete version of code for doing this  I have tested it  The BufferedImage and Base64 class do the trick mainly  Also some parameter needs to be set correctly     public class SimpleConvertImage       public static void main String   args  throws IOException          String dirName  C              ByteArrayOutputStream baos new ByteArrayOutputStream 1000           BufferedImage img ImageIO read new File dirName  rose jpg             ImageIO write img   jpg   baos           baos flush             String base64String Base64 encode baos toByteArray             baos close             byte   bytearray   Base64 decode base64String            BufferedImage imag ImageIO read new ByteArrayInputStream bytearray            ImageIO write imag   jpg   new File dirName  snap jpg               Reference link

User · Answer

Try this code snippet  BufferedImage image   ImageIO read new File  filename jpg         Process image  ImageIO write image   jpg   new File  output jpg

User · Answer

If you are using JDK 7 you can use the following code    import java nio file Files  import java io File   File fi   new File  myfile jpg    byte   fileContent   Files readAllBytes fi toPath

User · Answer

I think the best way to do that is to first read the file into a byte array  then convert the array to an image with ImageIO read

User · Answer

BufferedImage consists of two main classes  Raster  amp  ColorModel  Raster itself consists of two classes  DataBufferByte for image content while the other for pixel color   if you want the data from DataBufferByte  use    public byte   extractBytes  String ImageName  throws IOException       open image  File imgPath   new File ImageName    BufferedImage bufferedImage   ImageIO read imgPath        get DataBufferBytes from Raster  WritableRaster raster   bufferedImage  getRaster     DataBufferByte data      DataBufferByte  raster getDataBuffer      return   data getData          now you can process these bytes by hiding text in lsb for example  or process it the way you want

[java] how to convert image to byte array in java?

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