我遇到了问题,当我保存图像时,我无法打开它,因为它是空的,大小为零kb。我正在从一个文件夹中读取图像然后我将大小更改为100x100并保存它但它不起作用。这是我到目前为止编写的代码:
public BufferedImage resizeImageToPreview() {
final String SOURCE ="/Library/glassfishv3/glassfishv3/glassfish/domains/domain1/eclipseApps/LaFamilyEar/LaFamily_war/temp";
File source = new File(SOURCE);
BufferedImage image = null;
//Read images and convert them to BufferedImages
for (File img : source.listFiles()) {
try {
image = ImageIO.read(img);
} catch (IOException e) {
e.printStackTrace();
}
//Get image width and height
int w = image.getWidth();
int h = image.getHeight();
//Change the width and height to the image to 100x100
// BufferedImage dimg = new BufferedImage(100, 100, image.getType());
//Create graphics to be able to paint or change your image
Graphics2D g = image.createGraphics();
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g.drawImage(image, 0, 0, 100, 100, 0, 0, w, h, null);
g.dispose();
String extension = ".jpg";
File dest = new File("/Users/ernestodelgado/Kurs_Java/EjbWorkspace/LaFamily/WebContent/small/"+img.getName());
try {
ImageIO.write(image, extension, dest);
} catch (IOException e) {
e.printStackTrace();
}
}
return image;
}
答案 0 :(得分:2)
试试这个例子:
public class MakeSmaller {
public static void main(String... args) throws MalformedURLException,
IOException {
String url = "http://actionstalk.com/wp-content/uploads/2007/11/google_logo_3600x1500.jpg";
BufferedImage orig = ImageIO.read(new URL(url));
BufferedImage scaled = new BufferedImage(50, 50, orig.getType());
Graphics2D g = (Graphics2D) scaled.getGraphics();
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g.drawImage(orig, 0, 0, scaled.getWidth(), scaled.getHeight(), null);
g.dispose();
ImageIO.write(scaled, "jpg", new File("test.jpg"));
}
}
答案 1 :(得分:1)
尝试更改..
String extension = ".jpg";
.. ..到
String extension = "jpg";
显然,添加“。”到相关点的文件名。
如果这对您不起作用,请尝试发布SSCCE。