javax.imageio.ImageReader#addIIOReadProgressListener ( )源码实例Demo

public ReadAbortTest(String format) throws Exception {
    try {
        System.out.println("Test for format " + format);
        bimg = new BufferedImage(width, heght,
                BufferedImage.TYPE_INT_RGB);

        Graphics2D g = bimg.createGraphics();
        g.setColor(srccolor);
        g.fillRect(0, 0, width, heght);
        g.dispose();

        file = File.createTempFile("src_", "." + format, new File("."));
        ImageIO.write(bimg, format, file);
        ImageInputStream iis = ImageIO.createImageInputStream(file);

        Iterator iter = ImageIO.getImageReaders(iis);
        while (iter.hasNext()) {
            reader = (ImageReader) iter.next();
            break;
        }
        reader.setInput(iis);
        reader.addIIOReadProgressListener(this);

        // Abort reading in IIOReadProgressListener.imageStarted().
        startAbort = true;
        bimg = reader.read(0);
        startAbort = false;

        // Abort reading in IIOReadProgressListener.imageProgress().
        progressAbort = true;
        bimg = reader.read(0);
        progressAbort = false;

        iis.close();
        /*
         * All abort requests from imageStarted,imageProgress and
         * imageComplete from IIOReadProgressListener should be reached
         * otherwise throw RuntimeException.
         */
        if (!(startAborted
                && progressAborted)) {
            throw new RuntimeException("All IIOReadProgressListener abort"
                    + " requests are not processed for format "
                    + format);
        }
    } catch (Exception e) {
        throw e;
    } finally {
        Files.delete(file.toPath());
    }
}
 

private static void doTest(String compression) {
    try {
        BufferedImage img = createTestImage();

        ImageWriter iw = (ImageWriter)
            ImageIO.getImageWritersByFormatName("bmp").next();
        if (iw == null) {
            throw new RuntimeException("No writers for bmp format."
                                       + " Test failed.");
        }


        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        iw.setOutput(ImageIO.createImageOutputStream(baos));
        ImageWriteParam param = iw.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionType(compression);

        iw.write(null, new IIOImage(img, null, null), param);
        baos.close();

        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());

        ImageReader ir = (ImageReader)
            ImageIO.getImageReadersByFormatName("bmp").next();
        if (ir == null) {
            throw new RuntimeException("No readers for bmp format."
                                       + " Test failed.");
        }

        IIOReadUpdateAdapter updateAdapter = new IIOReadUpdateAdapter();
        IIOReadProgressAdapter progressAdapter = new IIOReadProgressAdapter();
        ir.addIIOReadProgressListener(progressAdapter);
        ir.addIIOReadUpdateListener(updateAdapter);
        ir.setInput(ImageIO.createImageInputStream(bais));
        BufferedImage dst = ir.read(0);

        progressAdapter.checkResults();

        if (!updateAdapter.isImageUpdateUsed) {
            throw new RuntimeException("imageUpdate was not used."
                                       + " Test failed.");
        }
    } catch(IOException e) {
        e.printStackTrace();
        throw new RuntimeException("Test failed");
    }
}
 

private static void doTest(String compression) {
    try {
        BufferedImage img = createTestImage();

        ImageWriter iw = (ImageWriter)
            ImageIO.getImageWritersByFormatName("bmp").next();
        if (iw == null) {
            throw new RuntimeException("No writers for bmp format."
                                       + " Test failed.");
        }


        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        iw.setOutput(ImageIO.createImageOutputStream(baos));
        ImageWriteParam param = iw.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionType(compression);

        iw.write(null, new IIOImage(img, null, null), param);
        baos.close();

        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());

        ImageReader ir = (ImageReader)
            ImageIO.getImageReadersByFormatName("bmp").next();
        if (ir == null) {
            throw new RuntimeException("No readers for bmp format."
                                       + " Test failed.");
        }

        IIOReadUpdateAdapter updateAdapter = new IIOReadUpdateAdapter();
        IIOReadProgressAdapter progressAdapter = new IIOReadProgressAdapter();
        ir.addIIOReadProgressListener(progressAdapter);
        ir.addIIOReadUpdateListener(updateAdapter);
        ir.setInput(ImageIO.createImageInputStream(bais));
        BufferedImage dst = ir.read(0);

        progressAdapter.checkResults();

        if (!updateAdapter.isImageUpdateUsed) {
            throw new RuntimeException("imageUpdate was not used."
                                       + " Test failed.");
        }
    } catch(IOException e) {
        e.printStackTrace();
        throw new RuntimeException("Test failed");
    }
}