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

/**
 * 
 */
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;
	}
}