java中ImageReader和BufferedImage获取图片尺寸实例

2024-07-13 10:15:56

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ImageReader 对象通常由特定格式的服务提供者接口 (SPI) 类实例化。服务提供者类（例如 ImageReaderSpi 的实例）向 IIORegistry 注册，后者使用前者进行格式识别和表示可用格式 reader 和 writer。

BufferedImage子类描述具有可访问图像数据缓冲区的Image。BufferedImage由图像数据的ColorModel和Raster组成。Raster的SampleModel中band的数量和类型必须与ColorModel所要求的数量和类型相匹配，以表示其颜色和alpha分量。所有BufferedImage对象的左上角坐标都为(0,0)。因此，用来构造BufferedImage的任何Raster都必须满足：minX=0且minY=0。

多的不用说，上代码，大家伙儿看看

java/130552.html">java;">/** *  */package com.b510;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.util.Date;import java.util.Iterator;import javax.imageio.ImageIO;import javax.imageio.ImageReader;import javax.imageio.stream.ImageInputStream;public class ImageUtil {	/**   * 源图片路径名称如:c:/1.jpg   */	private String srcpath = "e:/pool.jpg";	public ImageUtil() {	}	public static void main(String[] args) throws Exception {		ImageUtil util = new ImageUtil();		util.getImageSizeByImageReader(util.getSrcpath());		util.getImageSizeByBufferedImage(util.getSrcpath());	}	/**   * 使用ImageReader获取图片尺寸   *    * @param src   *      源图片路径   */	public void getImageSizeByImageReader(String src) {		long beginTime = new Date().getTime();		File file = new File(src);		try {			Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("jpg");			ImageReader reader = (ImageReader) readers.next();			ImageInputStream iis = ImageIO.createImageInputStream(file);			reader.setInput(iis, true);			System.out.println("width:" + reader.getWidth(0));			System.out.println("height:" + reader.getHeight(0));		}		catch (IOException e) {			e.printStackTrace();		}		long endTime = new Date().getTime();		System.out.println("使用[ImageReader]获取图片尺寸耗时：[" + (endTime - beginTime)+"]ms");	}	/**   * 使用BufferedImage获取图片尺寸   *    * @param src   *      源图片路径   */	public void getImageSizeByBufferedImage(String src) {		long beginTime = new Date().getTime();		File file = new File(src);		FileInputStream is = null;		try {			is = new FileInputStream(file);		}		catch (FileNotFoundException e2) {			e2.printStackTrace();		}		BufferedImage sourceImg = null;		try {			sourceImg = javax.imageio.ImageIO.read(is);			System.out.println("width:" + sourceImg.getWidth());			System.out.println("height:" + sourceImg.getHeight());		}		catch (IOException e1) {			e1.printStackTrace();		}		long endTime = new Date().getTime();		System.out.println("使用[BufferedImage]获取图片尺寸耗时：[" + (endTime - beginTime)+"]ms");	}	public String getSrcpath() {		return srcpath;	}	public void setSrcpath(String srcpath) {		this.srcpath = srcpath;	}}

运行结果：

java,imagereader,bufferedimage,获取,图片尺寸