Java JPEGImageEncoder.setJPEGEncodeParam方法代码示例

import com.sun.image.codec.jpeg.JPEGImageEncoder; //导入方法依赖的package包/类
void snapImageFile(String filename, int width, int height) {
  BufferedImage bImage = doRender(width, height);

  /*
   * JAI: RenderedImage fImage = JAI.create("format", bImage,
   * DataBuffer.TYPE_BYTE); JAI.create("filestore", fImage, filename +
   * ".tif", "tiff", null);
   */

  /* No JAI: */
  try {
    FileOutputStream fos = new FileOutputStream(filename + ".jpg");
    BufferedOutputStream bos = new BufferedOutputStream(fos);

    JPEGImageEncoder jie = JPEGCodec.createJPEGEncoder(bos);
    JPEGEncodeParam param = jie.getDefaultJPEGEncodeParam(bImage);
    param.setQuality(1.0f, true);
    jie.setJPEGEncodeParam(param);
    jie.encode(bImage);

    bos.flush();
    fos.close();
  } catch (Exception e) {
    System.out.println(e);
  }
}
 

import com.sun.image.codec.jpeg.JPEGImageEncoder; //导入方法依赖的package包/类
/**
 * jdk压缩图片-质量压缩
 * 
 * @param destImagePath 被压缩文件路径
 * @param quality 压缩质量比例
 * @return
 * @throws Exception
 */
public static void jdkResize(String destImagePath, float quality) throws Exception {
    // 目标文件
    File resizedFile = new File(destImagePath);
    // 压缩
    Image targetImage = ImageIO.read(resizedFile);
    int width = targetImage.getWidth(null);
    int height = targetImage.getHeight(null);
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    Graphics g = image.createGraphics();
    g.drawImage(targetImage, 0, 0, width, height, null);
    g.dispose();

    String ext = getFileType(resizedFile.getName());
    if (ext.equals("jpg") || ext.equals("jpeg")) { // 如果是jpg
                                                   // jpeg格式的对输出质量进行设置
        FileOutputStream out = new FileOutputStream(resizedFile);
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
        JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(image);
        jep.setQuality(quality, false);
        encoder.setJPEGEncodeParam(jep);
        encoder.encode(image);
        out.close();
    } else {
        ImageIO.write(image, ext, resizedFile);
    }

}
 

import com.sun.image.codec.jpeg.JPEGImageEncoder; //导入方法依赖的package包/类
/** Writes the current view in a <code>Canvas3D</code> object to an JPG file */
public static void writeJPEGFile(String fName, Canvas3D canvas){
	GraphicsContext3D  ctx = canvas.getGraphicsContext3D();
	// The raster components need all be set!
	Raster ras = new Raster(
			new Point3f(-1.0f,-1.0f,-1.0f),
			Raster.RASTER_COLOR,
			0,0,
			canvas.getWidth(),canvas.getHeight(),
			new ImageComponent2D( ImageComponent.FORMAT_RGB, new BufferedImage(canvas.getWidth(), canvas.getHeight(), BufferedImage.TYPE_INT_RGB)),
			null);

	ctx.readRaster(ras);

	// Now strip out the image info
	BufferedImage img = ras.getImage().getImage();

	// write that to disk....
	try {
		FileOutputStream out = new FileOutputStream(fName);
		JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
		JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(img);
		param.setQuality(0.95f,false); // 75% quality for the JPEG
		encoder.setJPEGEncodeParam(param);
		encoder.encode(img);
		out.close();
	} catch ( IOException e ) {
		e.printStackTrace();
	}
}
 

import com.sun.image.codec.jpeg.JPEGImageEncoder; //导入方法依赖的package包/类
/**
 * 输出为JPG文件
 * 
 * @param o 图像
 * @param output 输出文件
 * @throws IOException
 */
public static void writeJPG(BufferedImage o,File output) throws IOException{
  FileOutputStream out = new FileOutputStream(output);
  JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
  JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(o);
  param.setQuality(1f,false);
  encoder.setJPEGEncodeParam(param);
  encoder.encode(o);
  out.close();
}
 

import com.sun.image.codec.jpeg.JPEGImageEncoder; //导入方法依赖的package包/类
private void createThumbnail(String pathImage, String pathThumbnail){
	final int PREVIEW_WIDTH = 125;
	final int PREVIEW_HEIGHT = 125;	
	
	 File srcImage = new File(pathImage);
   	 ImageIcon imageIcon = null;
   	 if (srcImage != null) {			        		 
   		 // Test if need to be loaded with JAI libraries (different
 // format than JPG, PNG and GIF)
 if (TFileUtils.isJAIRequired(srcImage)) {
	 // Load it with JAI class
	 RenderedOp src_aux = JAI.create("fileload", srcImage.getAbsolutePath());
	 BufferedImage bufferedImage = src_aux.getAsBufferedImage();
	 imageIcon = new ImageIcon(bufferedImage);				
 } else {
	 // Create it as usual
	 imageIcon = new ImageIcon(srcImage.getAbsolutePath());
 }
   	 }
   	 File thum = new File (pathThumbnail);
   	 if (!thum.exists()){
 	try{
int thumbWidth = PREVIEW_WIDTH;
int thumbHeight = PREVIEW_HEIGHT;
double thumbRatio = (double)thumbWidth / (double)thumbHeight;
int imageWidth = imageIcon.getIconWidth();
int imageHeight = imageIcon.getIconHeight();
double imageRatio = (double)imageWidth / (double)imageHeight;
if (thumbRatio < imageRatio) {
	thumbHeight = (int)(thumbWidth / imageRatio);
} else {
	thumbWidth = (int)(thumbHeight * imageRatio);
}
BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = thumbImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(imageIcon.getImage(), 0, 0, thumbWidth, thumbHeight, null);
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(pathThumbnail));
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);
int quality = 100;
quality = Math.max(0, Math.min(quality, 100));
param.setQuality((float)quality / 100.0f, false);
encoder.setJPEGEncodeParam(param);
encoder.encode(thumbImage);
out.close(); 
} catch (Exception ex) {
	System.out.println("Error creating THUMBNAIL");
	System.out.println(ex.toString());   
}
   	 }
}