java开发_比较使用ImageReader和BufferedImage获取图片尺寸总结

多的不用说，先上代码，大家伙儿看看

/**
 * 
 */
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("" + 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("" + 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：

大家可以很容易明白...应该选择哪个方法了吧...