Examples of javax.imageio.stream.ImageOutputStream

javax.imageio.stream.ImageOutputStream
A seekable output stream interface for use by ImageWriters. Various output destinations, such as OutputStreams and Files, as well as future fast I/O destinations may be "wrapped" by a suitable implementation of this interface for use by the Image I/O API.
Unlike a standard OutputStream, ImageOutputStream extends its counterpart, ImageInputStream. Thus it is possible to read from the stream as it is being written. The same seek and flush positions apply to both reading and writing, although the semantics for dealing with a non-zero bit offset before a byte-aligned write are necessarily different from the semantics for dealing with a non-zero bit offset before a byte-aligned read. When reading bytes, any bit offset is set to 0 before the read; when writing bytes, a non-zero bit offset causes the remaining bits in the byte to be written as 0s. The byte-aligned write then starts at the next byte position. @see ImageInputStream

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            Iterator iterator = javax.imageio.ImageIO.getImageWritersByMIMEType(mimeType);
            if (iterator.hasNext()) {
                imageWriter = (ImageWriter) iterator.next();
            }
            ImageOutputStream ios = javax.imageio.ImageIO.createImageOutputStream(baos);
            imageWriter.setOutput(ios);
            imageWriter.write(new IIOImage(bufferedImage, null, null));
            ios.flush();
            imageWriter.dispose();
            return baos.toByteArray();
        } catch (IOException e) {
            throw ExceptionFactory.makeWebServiceException(e);
        }

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        // fast method to write to a file with default options
        // ImageIO.write((BufferedImage)(image), "jpg", new File("fractal-" + counter++ + ".jpg"));


        // create image in memory
        ByteArrayOutputStream bos = new ByteArrayOutputStream(200*1024);
        ImageOutputStream ios = ImageIO.createImageOutputStream(bos);
        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName( "jpg" );
        ImageWriter imageWriter = writers.next();


        JPEGImageWriteParam params = new JPEGImageWriteParam( Locale.getDefault() );
        params.setCompressionMode( ImageWriteParam.MODE_EXPLICIT );
        params.setCompressionQuality( 0.9f );


        imageWriter.setOutput( ios );
        imageWriter.write( null, new IIOImage( image, null, null ), params );
        ios.close();


        // write memory block to a file
        // String fileName = String.format(pattern, counter++);
        // FileOutputStream outputStream = new FileOutputStream (fileName);
        // bos.writeTo(outputStream);

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      contentType = getDefaultContentType();
    }
    Assert.notNull(contentType,
        "Count not determine Content-Type, set one using the 'defaultContentType' property");
    outputMessage.getHeaders().setContentType(contentType);
    ImageOutputStream imageOutputStream = null;
    ImageWriter imageWriter = null;
    try {
      imageOutputStream = createImageOutputStream(outputMessage.getBody());
      Iterator<ImageWriter> imageWriters = ImageIO.getImageWritersByMIMEType(contentType.toString());
      if (imageWriters.hasNext()) {
        imageWriter = imageWriters.next();
        ImageWriteParam iwp = imageWriter.getDefaultWriteParam();
        process(iwp);
        imageWriter.setOutput(imageOutputStream);
        imageWriter.write(null, new IIOImage(image, null, null), iwp);
      }
      else {
        throw new HttpMessageNotWritableException(
            "Could not find javax.imageio.ImageWriter for Content-Type [" + contentType + "]");
      }
    }
    finally {
      if (imageWriter != null) {
        imageWriter.dispose();
      }
      if (imageOutputStream != null) {
        try {
          imageOutputStream.close();
        }
        catch (IOException ex) {
          // ignore
        }
      }

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    ByteArrayOutputStream os = new ByteArrayOutputStream();
    ImageWriter iw = (ImageWriter)ImageIO.getImageWritersByFormatName("jpeg").next();
    ImageWriteParam iwp = iw.getDefaultWriteParam();
    iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    iwp.setCompressionQuality(_quality);
    ImageOutputStream ios = ImageIO.createImageOutputStream(os);
    iw.setOutput(ios);
    iw.write(null, new IIOImage(image, null, null), iwp);
    ios.flush();
    iw.dispose();
    ios.close();
    return os.toByteArray();
  }

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                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ImageWriteParam iwparam = new JPEGImageWriteParam(Locale.getDefault());
                iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
                iwparam.setCompressionQuality(jpegQuality);//Set here your compression rate
                ImageWriter iw = ImageIO.getImageWritersByFormatName("jpg").next();
                ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
                iw.setOutput(ios);
                iw.write(null, new IIOImage(scaled, null, null), iwparam);
                iw.dispose();
                ios.close();


                scaled.flush();
                scaled = null;
                image = com.itextpdf.text.Image.getInstance(baos.toByteArray());

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         if(obj instanceof BufferedImage)
         {
            ImageWriter encoder = ImageIO.getImageWritersByFormatName("JPEG").next();
            try
            {
               ImageOutputStream ios = ImageIO.createImageOutputStream(out);
               encoder.setOutput(ios);
               encoder.write((BufferedImage)obj);
            }
            catch (IOException e)
            {

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    }
  }


  private void setWriterOutput(File file, ImageWriter writer)
      throws IOException {
    ImageOutputStream ios = null;
    ios = ImageIO.createImageOutputStream(file);


    writer.setOutput(ios);
  }

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            "PNG compression not implemented");
      }
      Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
      ImageWriter writer;
      writer = (ImageWriter) iter.next();
      ImageOutputStream ios = ImageIO.createImageOutputStream(new File(
          toFileName));
      writer.setOutput(ios);
      ImageWriteParam iwparam = new JPEGImageWriteParam(Locale
          .getDefault());
      iwparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
      iwparam.setCompressionQuality(0.7F);
      writer.write(null, new IIOImage(image, null, null), iwparam);
      ios.flush();
      writer.dispose();
      ios.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

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        ImageWriter writer = null;
        Iterator iter = javax.imageio.ImageIO.getImageWritersByMIMEType(mimeType);
        if (iter.hasNext()) {
            writer = (ImageWriter) iter.next();
        }
        ImageOutputStream ios = javax.imageio.ImageIO.createImageOutputStream(os);
        writer.setOutput(ios);


        writer.write(new IIOImage(image, null, null));
        ios.flush();
        writer.dispose();
    } // saveImage

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    private static boolean writeImage(BufferedImage image, String imageFormat, Object outputStream, int resolution)
    throws IOException
    {
        boolean bSuccess = true;
        ImageOutputStream output = null;
        ImageWriter imageWriter = null;
        try
        {
            output = ImageIO.createImageOutputStream( outputStream );
    
            boolean foundWriter = false;
            Iterator<ImageWriter> writerIter = ImageIO.getImageWritersByFormatName( imageFormat );
            while( writerIter.hasNext() && !foundWriter )
            {
                try
                {
                    imageWriter = (ImageWriter)writerIter.next();
                    ImageWriteParam writerParams = imageWriter.getDefaultWriteParam();
                    if( writerParams.canWriteCompressed() )
                    {
                        writerParams.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
                        // reset the compression type if overwritten by setCompressionMode
                        if (writerParams.getCompressionType() == null)
                        {
                            writerParams.setCompressionType(writerParams.getCompressionTypes()[0]);
                        }
                        writerParams.setCompressionQuality(1.0f);
                    }
                    IIOMetadata meta = createMetadata( image, imageWriter, writerParams, resolution);
                    imageWriter.setOutput( output );
                    imageWriter.write( null, new IIOImage( image, null, meta ), writerParams );
                    foundWriter = true;
                }
                catch( IIOException io )
                {
                    throw new IOException( io.getMessage() );
                }
                finally
                {
                    if( imageWriter != null )
                    {
                        imageWriter.dispose();
                    }
                }
            }
            if( !foundWriter )
            {
                bSuccess = false;
            }
        }
        finally
        {
            if( output != null )
            {
                output.flush();
                output.close();
            }
        }
        return bSuccess;
    }

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