在获取Java图像的高度和宽度没有的ImageObserver [英] Getting Height and Width of Image in Java without an ImageObserver

问题描述

我试图让高度和宽度 Java中的图像（通过URL）中没有的ImageObserver 。
我现在的code是：

I am trying to get the height and width of images (via a url) in Java without an ImageObserver. My current code is:

public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub

    File xmlImages = new File("C:\\images.xml");
    BufferedReader br = new BufferedReader(new FileReader(xmlImages));
    File output = new File("C:\\images.csv");
    BufferedWriter bw = new BufferedWriter(new FileWriter(output));
    StringBuffer sb = new StringBuffer();
    String line = null;
    String newline = System.getProperty("line.separator");
    while((line = br.readLine()) != null){
        if(line.contains("http")){
            URL url = new URL(line.)
            Image img = Toolkit.getDefaultToolkit().getImage(url);
            sb.append(line + ","+ img.getHeight(null) + "," + img.getWidth(Null) + newline);            
        }

    }

    br.close();
    bw.write(sb.toString());
    bw.close();
}

当我进入调试模式下我能看到图像加载，我可以看到高度和宽度的形象，但我似乎无法归还。在的getHeight（）和的getWidth（）方法需要的图像观察者，我没有。谢谢你在前进。

When i go into debug mode I am able to see that the image was loaded and I can see the height and the width of the image, but i can't seem to return them. The getHeight() and getWidth() methods require an Image Observer, which i don't have. Thank you in advance.

推荐答案

您可以使用<一个href=\"http://download.oracle.com/docs/cd/E17409_01/javase/6/docs/api/javax/swing/ImageIcon.html\">ImageIcon处理图像的加载适合你。

You can use ImageIcon to handle the loading of the image for you.

修改

Image img = Toolkit.getDefaultToolkit().getImage(url);
sb.append(line + ","+ img.getHeight(null) + "," + img.getWidth(Null) + newline);

到

ImageIcon img = new ImageIcon(url);
sb.append(line + ","+ img.getIconHeight(null) + "," + img.getIconWidth(Null) + newline);

主要的变化是使用的ImageIcon 和 getIconWidth ， getIconHeight 方法。

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