如何在java中获取图像的大小

Question

嗨,我在java中使用Jtidy解析器.

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URL url = new URL("http://l1.yimg.com/t/frontpage/baba-ramdev-310511-60.jpg");  
Image image = new ImageIcon(url).getImage();
int imgWidth = image.getWidth(null);
int imgHeight = image.getHeight(null);

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上面的代码工作正常,我正确得到高度和宽度.但我想看到图像的大小(例如它是以KB还是以MB为单位).请帮助我,如何获得图像的大小.有什么办法吗？

Answer 1

这是找到图像尺寸的最简单方法之一.

 URL url=new URL("Any web image url");
 BufferedImage image = ImageIO.read(url);
 int height = image.getHeight();
 int width = image.getWidth();
 System.out.println("Height : "+ height);
 System.out.println("Width : "+ width);

Answer 2

尝试:

url.openConnection().getContentLength();

如果这不起作用,您可以使用以下命令加载流:

url.openStream()

...并读取流直到结束,计算实际读取的字节数.您也可以CountingInputStream稍后使用装饰器重用该流.但是第一个代码片段似乎有用.

Answer 3

如何计算你的字节并吃掉它们.

import java.awt.Image;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.net.URL;
import java.io.*;

class ImageInfo {

    public static void main(String[] args) throws Exception {
        URL url = new URL(
            "http://l1.yimg.com/t/frontpage/baba-ramdev-310511-60.jpg");
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        InputStream is = url.openStream();
        byte[] b = new byte[2^16];
        int read = is.read(b);
        while (read>-1) {
            baos.write(b,0,read);
            read = is.read(b);
        }
        int countInBytes = baos.toByteArray().length;
        ByteArrayInputStream bais = new ByteArrayInputStream(
            baos.toByteArray());
        Image image = ImageIO.read(bais);
        int width = image.getWidth(null);
        int height = image.getHeight(null);
        String imageInfo =
            width + "x" + height + " px, " +
            countInBytes + " bytes.";
        JOptionPane.showMessageDialog(null,
            new JLabel(imageInfo, new ImageIcon(image), SwingConstants.CENTER));
    }
}