Java ImageWriter.dispose方法代码示例

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
public static byte[] compress(BufferedImage image, float scale) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
    ImageWriter writer = writers.next();
    ImageWriteParam param = writer.getDefaultWriteParam();
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    param.setCompressionQuality(scale);
    ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
    writer.setOutput(ios);
    writer.write(null, new IIOImage(image, null, null), param);
    byte[] data = baos.toByteArray();
    writer.dispose();
    return data;
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
public static void saveImage(final String fileName, final BufferedImage image, ImageFormat imageFormat) {
  try {
    final File file = new File(fileName);
    final String extension = FileUtilities.getExtension(fileName);
    Iterator<ImageWriter> iter = null;
    if (canWriteFormat(extension)) {
      iter = ImageIO.getImageWritersByFormatName(extension);
    } else {
      iter = ImageIO.getImageWritersByFormatName(imageFormat.toString());
    }

    final ImageWriter writer = iter.next();
    final ImageWriteParam iwp = writer.getDefaultWriteParam();

    file.getParentFile().mkdirs();
    try (final FileImageOutputStream output = new FileImageOutputStream(file.getAbsoluteFile())) {
      writer.setOutput(output);
      final IIOImage outimage = new IIOImage(image, null, null);
      writer.write(null, outimage, iwp);
      writer.dispose();
    }
  } catch (final IOException e) {
    log.log(Level.SEVERE, e.getMessage(), e);
  }
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
void save(File file) throws IOException {
    ImageWriter iw = null;
    String name = file.getName();
    int i = name.lastIndexOf('.');
    if (i >= 0) {
        String extension = name.substring(i + 1);
        Iterator<ImageWriter> imageWritersBySuffix = ImageIO.getImageWritersBySuffix(extension);
        if (imageWritersBySuffix.hasNext()) {
            iw = imageWritersBySuffix.next();
        }
    }
    if (iw != null) {
        file.delete();
        ImageOutputStream ios = ImageIO.createImageOutputStream(file);
        iw.setOutput(ios);
        try {
            iw.write((BufferedImage) image);
        } finally {
            iw.dispose();
            ios.flush();
            ios.close();
        }
    } else {
        ImageIO.write((BufferedImage) image, "PNG", file);
    }
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
/**
 * Encodes an image in JPEG format and writes it to an output stream.
 *
 * @param bufferedImage  the image to be encoded (<code>null</code> not 
 *     permitted).
 * @param outputStream  the OutputStream to write the encoded image to 
 *     (<code>null</code> not permitted).
 * 
 * @throws IOException if there is an I/O problem.
 * @throws NullPointerException if <code>bufferedImage</code> is 
 *     <code>null</code>.
 */
public void encode(BufferedImage bufferedImage, OutputStream outputStream) 
        throws IOException {
    if (bufferedImage == null) {
        throw new IllegalArgumentException("Null 'image' argument.");
    }
    if (outputStream == null) {
        throw new IllegalArgumentException("Null 'outputStream' argument.");
    }
    Iterator iterator = ImageIO.getImageWritersByFormatName("jpeg");
    ImageWriter writer = (ImageWriter) iterator.next();
    ImageWriteParam p = writer.getDefaultWriteParam();
    p.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    p.setCompressionQuality(this.quality);
    ImageOutputStream ios = ImageIO.createImageOutputStream(outputStream);
    writer.setOutput(ios);
    writer.write(null, new IIOImage(bufferedImage, null, null), p);
    ios.flush();
    writer.dispose();
    ios.close();
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
private static Image createTestImage() throws IOException  {
    BufferedImage frame1 = createFrame(new int[] { 0xffff0000, 0xffff0000 });
    BufferedImage frame2 = createFrame(new int[] { 0xff0000ff, 0xffff0000 });

    ImageWriter writer = ImageIO.getImageWritersByFormatName("GIF").next();
    ImageOutputStream ios = ImageIO.createImageOutputStream(new File("lut_test.gif"));
    ImageWriteParam param = writer.getDefaultWriteParam();
    writer.setOutput(ios);
    writer.prepareWriteSequence(null);
    writer.writeToSequence(new IIOImage(frame1, null, null), param);
    writer.writeToSequence(new IIOImage(frame2, null, null), param);
    writer.endWriteSequence();
    writer.reset();
    writer.dispose();

    ios.flush();
    ios.close();

    return Toolkit.getDefaultToolkit().createImage("lut_test.gif");
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
private static void test(final ImageWriter writer) throws Exception {
    final File file = File.createTempFile("temp", ".img");
    file.deleteOnExit();
    final FileOutputStream fos = new FileOutputStream(file);
    final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
    writer.setOutput(ios);
    final IIOMetadata data = writer.getDefaultStreamMetadata(null);

    if (writer.canWriteSequence()) {
        writer.prepareWriteSequence(data);
    } else {
        try {
            writer.prepareWriteSequence(data);
            throw new RuntimeException(
                    "UnsupportedOperationException was not thrown");
        } catch (final UnsupportedOperationException ignored) {
            // expected
        }
    }
    writer.dispose();
    ios.close();
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
/**
 * 根据质量压缩图片，不改变图片的尺寸
 * 
 * @param imgContent
 *            图片内容
 * @param quality
 *            缩放比例
 * @param extName
 *            后缀名
 * @return
 */
public byte[] compress(byte[] imgContent, float quality, String extName) {
	if (quality > 1 || quality <= 0 || imgContent == null || WakaUtils.string.isEmpty(extName)) {
		throw new ZhhrUtilException("压缩文件失败！入参为空");
	}
	try (InputStream is = new ByteArrayInputStream(imgContent);
			ByteArrayOutputStream os = new ByteArrayOutputStream();
			ImageOutputStream ios = ImageIO.createImageOutputStream(os);) {
		BufferedImage image = ImageIO.read(is);

		Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName(extName);
		ImageWriter writer = writers.next();
		writer.setOutput(ios);

		ImageWriteParam param = writer.getDefaultWriteParam();
		param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
		param.setCompressionQuality(quality);

		writer.write(null, new IIOImage(image, null, null), param);
		writer.dispose();

		return os.toByteArray();
	} catch (IOException e) {
		throw new ZhhrUtilException(e.getMessage(), e);
	}
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
@Override
public BufferedImage apply(BufferedImage img) {

	if(compressionLevel == 0f)
		return img;
	
	try {
		ImageWriter iw = ImageIO.getImageWritersByFormatName("jpeg").next();
		JPEGImageWriteParam iwp = (JPEGImageWriteParam) iw.getDefaultWriteParam();
		iwp.setOptimizeHuffmanTables(false);
		iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
		iwp.setProgressiveMode(ImageWriteParam.MODE_DISABLED);
		iwp.setCompressionQuality(1f-compressionLevel);


		ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
		iw.setOutput(new MemoryCacheImageOutputStream(baos)); 

		IIOImage outputImage = new IIOImage(img, null, null);
		iw.write(null, outputImage, iwp);
		iw.dispose();
		
		baos.flush(); 
		byte[] returnImage = baos.toByteArray(); 
		baos.close();
		
		
		BufferedImage img2 = ImageIO.read(new ByteArrayInputStream(returnImage));
		
		if(img2 == null)
			throw new Exception();
		else
			img = img2;

	} catch (Exception e) {
		e.printStackTrace();
	}

	return img;
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
/**
    * Reads the original image, creates a resized copy of it and returns its input stream. largestDimension is the
    * largest dimension of the resized image, the other dimension is scaled accordingly.
    *
    * @param image
    *            original image
    * @param largestDimension
    *            the largest dimension of the resized image, the other dimension is scaled accordingly
    * @return
    * @throws IOException
    * @throws UploadImageGalleryFileException
    */
   public static InputStream resize(BufferedImage image, int largestDimension) throws IOException {
try {
    //resize to 150 pixels max
    BufferedImage outImage = Scalr.resize(image, Method.QUALITY, largestDimension);
    
    //set jpeg compression quality explicitly
    ImageWriter imageWriter = ImageIO.getImageWritersByFormatName("jpeg").next();
    ImageWriteParam jpgWriteParam = imageWriter.getDefaultWriteParam();
    jpgWriteParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    jpgWriteParam.setCompressionQuality(.95f);

    // buffer all data in a circular buffer of infinite sizes
    CircularByteBuffer outputBuffer = new CircularByteBuffer(CircularByteBuffer.INFINITE_SIZE);
    ImageOutputStream ios = ImageIO.createImageOutputStream(outputBuffer.getOutputStream());
    imageWriter.setOutput(ios);
    IIOImage outputImage = new IIOImage(outImage, null, null);
    imageWriter.write(null, outputImage, jpgWriteParam);
    imageWriter.dispose();
    outputBuffer.getOutputStream().close();

    return outputBuffer.getInputStream();

} catch (IOException e) {
    log.error(e.getStackTrace());
    return null;
}
   }
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
public Base64Data print(Image v) {
    ByteArrayOutputStreamEx imageData = new ByteArrayOutputStreamEx();
    XMLSerializer xs = XMLSerializer.getInstance();

    String mimeType = xs.getXMIMEContentType();
    if(mimeType==null || mimeType.startsWith("image/*"))
        // because PNG is lossless, it's a good default
        //
        // mime type can be a range, in which case we can't just pass that
        // to ImageIO.getImageWritersByMIMEType, so here I'm just assuming
        // the default of PNG. Not sure if this is complete.
        mimeType = "image/png";

    try {
        Iterator<ImageWriter> itr = ImageIO.getImageWritersByMIMEType(mimeType);
        if(itr.hasNext()) {
            ImageWriter w = itr.next();
            ImageOutputStream os = ImageIO.createImageOutputStream(imageData);
            w.setOutput(os);
            w.write(convertToBufferedImage(v));
            os.close();
            w.dispose();
        } else {
            // no encoder
            xs.handleEvent(new ValidationEventImpl(
                ValidationEvent.ERROR,
                Messages.NO_IMAGE_WRITER.format(mimeType),
                xs.getCurrentLocation(null) ));
            // TODO: proper error reporting
            throw new RuntimeException("no encoder for MIME type "+mimeType);
        }
    } catch (IOException e) {
        xs.handleError(e);
        // TODO: proper error reporting
        throw new RuntimeException(e);
    }
    Base64Data bd = new Base64Data();
    imageData.set(bd,mimeType);
    return bd;
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
public static void main(final String[] argv) throws Exception {

        IIOMetadata jpegmetadata = null;
        ImageWriter jpgWriter = ImageIO.getImageWritersByFormatName("jpg").next();
        try {
        jpegmetadata = createJPEGMetadata(jpgWriter);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageOutputStream output = ImageIO.createImageOutputStream(baos);
        jpgWriter.setOutput(output);
        int w=100, h=100;
        BufferedImage bi = new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = bi.createGraphics();
        g2d.setColor(Color.white);
        g2d.fillRect(0, 0, w, h);
        IIOImage image = new IIOImage(bi, null, jpegmetadata);
        jpgWriter.write(null, image, null);
        jpgWriter.dispose();

        baos.flush();
        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        ImageInputStream iis = ImageIO.createImageInputStream(bais);
        bi = ImageIO.read(iis);
        for (int i=0; i<bi.getWidth(); i++) {
            for(int j=0; j<bi.getHeight(); j++) {
               if (bi.getRGB(i, j) != Color.white.getRGB()) {
                   throw new RuntimeException("Wrong color : " + Integer.toHexString(bi.getRGB(i, j)));
               }
            }
        }

    }
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
private static void test(final ImageWriter writer) throws Exception {
    try {
        file = File.createTempFile("temp", ".img");
        fos = new FileOutputStream(file);
        final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
        writer.setOutput(ios);
        final IIOMetadata data = writer.getDefaultStreamMetadata(null);

        if (writer.canWriteSequence()) {
            writer.prepareWriteSequence(data);
        } else {
            try {
                writer.prepareWriteSequence(data);
                throw new RuntimeException(
                        "UnsupportedOperationException was not thrown");
            } catch (final UnsupportedOperationException ignored) {
            // expected
            }
        }
    } finally {
        writer.dispose();
        if (file != null) {
            if (fos != null) {
                fos.close();
            }
            Files.delete(file.toPath());
        }
    }
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
@Override
public void write(BufferedImage image, MediaType contentType, HttpOutputMessage outputMessage)
		throws IOException, HttpMessageNotWritableException {

	if (contentType == null || contentType.isWildcardType() || contentType.isWildcardSubtype()) {
		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
			}
		}
	}
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
public static void test(String mimeType, boolean useStreamMeta,
                        String metaXml, String... boolXpaths)
    throws Exception
{
    BufferedImage img =
        new BufferedImage(16, 16, BufferedImage.TYPE_INT_RGB);
    ImageWriter iw = ImageIO.getImageWritersByMIMEType(mimeType).next();
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    ImageOutputStream ios = new MemoryCacheImageOutputStream(os);
    iw.setOutput(ios);
    ImageWriteParam param = null;
    IIOMetadata streamMeta = iw.getDefaultStreamMetadata(param);
    IIOMetadata imageMeta =
        iw.getDefaultImageMetadata(new ImageTypeSpecifier(img), param);
    IIOMetadata meta = useStreamMeta ? streamMeta : imageMeta;
    Source src = new StreamSource(new StringReader(metaXml));
    DOMResult dst = new DOMResult();
    transform(src, dst);
    Document doc = (Document)dst.getNode();
    Element node = doc.getDocumentElement();
    String metaFormat = node.getNodeName();

    // Verify that the default metadata gets formatted correctly.
    verify(meta.getAsTree(metaFormat), boolXpaths, false);

    meta.mergeTree(metaFormat, node);

    // Verify that the merged metadata gets formatte correctly.
    verify(meta.getAsTree(metaFormat), boolXpaths, true);

    iw.write(streamMeta, new IIOImage(img, null, imageMeta), param);
    iw.dispose();
    ios.close();
    ImageReader ir = ImageIO.getImageReader(iw);
    byte[] bytes = os.toByteArray();
    if (bytes.length == 0)
        throw new AssertionError("Zero length image file");
    ByteArrayInputStream is = new ByteArrayInputStream(bytes);
    ImageInputStream iis = new MemoryCacheImageInputStream(is);
    ir.setInput(iis);
    if (useStreamMeta) meta = ir.getStreamMetadata();
    else meta = ir.getImageMetadata(0);

    // Verify again after writing and re-reading the image
    verify(meta.getAsTree(metaFormat), boolXpaths, true);
}
 

import javax.imageio.ImageWriter; //导入方法依赖的package包/类
private void test(final ImageWriter writer) throws IOException {
    // Image initialization
    final BufferedImage imageWrite = new BufferedImage(WIDTH, HEIGHT,
                                                       TYPE_BYTE_BINARY);
    final Graphics2D g = imageWrite.createGraphics();
    g.setColor(Color.WHITE);
    g.fillRect(0, 0, WIDTH, HEIGHT);
    g.dispose();

    // File initialization
    final File file = File.createTempFile("temp", ".img");
    file.deleteOnExit();
    final FileOutputStream fos = new SkipWriteOnAbortOutputStream(file);
    final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
    writer.setOutput(ios);
    writer.addIIOWriteProgressListener(this);

    // This write will be aborted, and file will not be touched
    writer.write(imageWrite);
    if (!isStartedCalled) {
        throw new RuntimeException("Started should be called");
    }
    if (!isProgressCalled) {
        throw new RuntimeException("Progress should be called");
    }
    if (!isAbortCalled) {
        throw new RuntimeException("Abort should be called");
    }
    if (isCompleteCalled) {
        throw new RuntimeException("Complete should not be called");
    }
    // Flush aborted data
    ios.flush();

    // This write should be completed successfully and the file should
    // contain correct image data.
    abortFlag = false;
    isAbortCalled = false;
    isCompleteCalled = false;
    isProgressCalled = false;
    isStartedCalled = false;
    writer.write(imageWrite);

    if (!isStartedCalled) {
        throw new RuntimeException("Started should be called");
    }
    if (!isProgressCalled) {
        throw new RuntimeException("Progress should be called");
    }
    if (isAbortCalled) {
        throw new RuntimeException("Abort should not be called");
    }
    if (!isCompleteCalled) {
        throw new RuntimeException("Complete should be called");
    }
    writer.dispose();
    ios.close();

    // Validates content of the file.
    final BufferedImage imageRead = ImageIO.read(file);
    for (int x = 0; x < WIDTH; ++x) {
        for (int y = 0; y < HEIGHT; ++y) {
            if (imageRead.getRGB(x, y) != imageWrite.getRGB(x, y)) {
                throw new RuntimeException("Test failed.");
            }
        }
    }
}