在没有 ImageObserver 的情况下在 Java 中获取图像的高度和宽度
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Getting Height and Width of Image in Java without an ImageObserver
提问by Bilzac
I am trying to get the heightand widthof images (via a url) in Java without an ImageObserver.
My current code is:
我试图在没有 ImageObserver 的情况下在 Java 中获取图像的height和width（通过 url）。我目前的代码是：
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();
}
When i go into debug mode I am able to see that the image was loaded and I can see the heightand the widthof 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.
当我进入调试模式时，我能够看到图像已加载，并且可以看到图像的height和width，但我似乎无法返回它们。该getHeight()和getWidth()方法需要的图像观察者，我没有。先感谢您。
回答by mdma
You can use ImageIconto handle the loading of the image for you.
您可以使用ImageIcon为您处理图像的加载。
Change
改变
Image img = Toolkit.getDefaultToolkit().getImage(url);
sb.append(line + ","+ img.getHeight(null) + "," + img.getWidth(Null) + newline);
to
到
ImageIcon img = new ImageIcon(url);
sb.append(line + ","+ img.getIconHeight(null) + "," + img.getIconWidth(Null) + newline);
The main change is to use ImageIcon, and the getIconWidth, getIconHeightmethods.
主要的变化是使用ImageIcon, 和getIconWidth,getIconHeight方法。
回答by YoK
Following should work
以下应该工作
Image image = Toolkit.getDefaultToolkit().getImage(image_url);
ImageIcon icon = new ImageIcon(image);
int height = icon.getIconHeight();
int width = icon.getIconWidth();
sb.append(line + ","+ height + "," + width + newline);
回答by NightFury
One can get width and height using following code if there is difficulty in retrieving URL.
如果检索 URL 有困难，可以使用以下代码获取宽度和高度。
try {
File f = new File(yourclassname.class.getResource("data/buildings.jpg").getPath());
BufferedImage image = ImageIO.read(f);
int height = image.getHeight();
int width = image.getWidth();
System.out.println("Height : "+ height);
System.out.println("Width : "+ width);
}
catch (IOException io) {
io.printStackTrace();
}
Note:datais folder in /src containing images.
注意：data是 /src 中包含图像的文件夹。
Credit goes to Getting height and width of image in Java
