Java 9 多分辨率图像 API
Java 9 新特性Java 9 定义多分辨率图像 API，开发者可以很容易的操作和展示不同分辨率的图像了。
以下是多分辨率图像的主要操作方法：
Image getResolutionVariant(double destImageWidth, double destImageHeight) − 获取特定分辨率的图像变体-表示一张已知分辨率单位为DPI的特定尺寸大小的逻辑图像，并且这张图像是最佳的变体。。
List<Image> getResolutionVariants() − 返回可读的分辨率的图像变体列表。
实例
importjava.io.IOException;
importjava.net.URL;
importjava.net.MalformedURLException;
importjava.util.ArrayList;
importjava.util.List;
importjava.awt.Image;
importjava.awt.image.MultiResolutionImage;
importjava.awt.image.BaseMultiResolutionImage;
importjavax.imageio.ImageIO;
publicclassTester{publicstaticvoidmain(String[]args)throwsIOException, MalformedURLException{List<String> imgUrls = List.of("http://www.runoob.com/wp-content/themes/runoob/assets/img/runoob-logo@2x.png",
"http://www.runoob.com/wp-content/themes/runoob/assets/img/runoob-logo.png",
"http://www.runoob.com/wp-content/themes/runoob/assets/images/qrcode.png");
List<Image> images = newArrayList<Image>();
for(Stringurl : imgUrls){images.add(ImageIO.read(newURL(url)));
}// 读取所有图片MultiResolutionImagemultiResolutionImage =
newBaseMultiResolutionImage(images.toArray(newImage[0]));
// 获取图片的所有分辨率List<Image> variants = multiResolutionImage.getResolutionVariants();
System.out.println("Total number of images: " + variants.size());
for(Imageimg : variants){System.out.println(img);
}// 根据不同尺寸获取对应的图像分辨率Imagevariant1 = multiResolutionImage.getResolutionVariant(156, 45);
System.out.printf("\nImage for destination[%d,%d]: [%d,%d]",
156, 45, variant1.getWidth(null), variant1.getHeight(null));
Imagevariant2 = multiResolutionImage.getResolutionVariant(311, 89);
System.out.printf("\nImage for destination[%d,%d]: [%d,%d]", 311, 89,
variant2.getWidth(null), variant2.getHeight(null));
Imagevariant3 = multiResolutionImage.getResolutionVariant(622, 178);
System.out.printf("\nImage for destination[%d,%d]: [%d,%d]", 622, 178,
variant3.getWidth(null), variant3.getHeight(null));
Imagevariant4 = multiResolutionImage.getResolutionVariant(300, 300);
System.out.printf("\nImage for destination[%d,%d]: [%d,%d]", 300, 300,
variant4.getWidth(null), variant4.getHeight(null));
}}