How to convert array of bytes into Image in Java SE

You can do it using Raster class. It's better because it does not require iterating and copying of byte arrays.

 byte[] raw = new byte[width*height*3]; // raw bytes of our image
 DataBuffer buffer = new DataBufferByte(raw, raw.length);

 //The most difficult part of awt api for me to learn
 SampleModel sampleModel = new ComponentSampleModel(DataBuffer.TYPE_BYTE, width, height, 3, width*3, new int[]{2,1,0});

 Raster raster = Raster.createRaster(sampleModel, buffer, null);

 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
 image.setData(raster);

Assuming you know the height and width of the image.

BufferedImage img=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for(int r=0; r<height; r++)
for(int c=0; c<width; c++)
{
  int index=r*width+c;
  int red=colors[index] & 0xFF;
  int green=colors[index+1] & 0xFF;
  int blue=colors[index+2] & 0xFF;
  int rgb = (red << 16) | (green << 8) | blue;
  img.setRGB(c, r, rgb);
}

Roughly. This assumes the pixel data is encoded as a set of rows; and that the length of colors is 3 * width * height (which should be valid).

folkyatina's approach works if your RGB values are in B,G,R order, but if they are in R,G,B order I have found the following code to work:

    DataBuffer rgbData = new DataBufferByte(rgbs, rgbs.length);

    WritableRaster raster = Raster.createInterleavedRaster(
        rgbData, width, height,
        width * 3, // scanlineStride
        3, // pixelStride
        new int[]{0, 1, 2}, // bandOffsets
        null);

    ColorModel colorModel = new ComponentColorModel(
        ColorSpace.getInstance(ColorSpace.CS_sRGB),
        new int[]{8, 8, 8}, // bits
        false, // hasAlpha
        false, // isPreMultiplied
        ComponentColorModel.OPAQUE,
        DataBuffer.TYPE_BYTE);

    return new BufferedImage(colorModel, raster, false, null);