Wicket从文件系统创建图像 [英] Wicket create images from file system
问题描述
我正在制作一个项目,用户在点击产品时会打开一个带有产品名称的模态窗口。我还想在面板内的模态窗口中包含产品图像。图像存储在我的服务器上的目录中。
I am making a project in which user when click on a product a modal window open with the product name. I also want to include the product image on my modal window inside a panel. Images are stored on my server in a directory.
我指的是这个链接
我的面板html代码看起来像这样的 http://wicketinaction.com/2011/07/wicket -1-5-mounting-resources /
My panel html code look like this http://wicketinaction.com/2011/07/wicket-1-5-mounting-resources/
ItemOrderPanel.html
ItemOrderPanel.html
<div>
<li><a wicket:id="link"></a></li>
</div>
ItemOrderPanel.java
ItemOrderPanel.java
final ResourceReference imageResourceReference = new ImageResourceReference();
String imageName = itm.getProductImage();
final PageParameters parameters = new PageParameters();
parameters.set("name", imageName);
CharSequence urlForImage = getRequestCycle().urlFor(imageResourceReference,parameters);
ExternalLink link = new ExternalLink("link", urlForImage.toString());
link.setBody(Model.of(imageName));
add(link);
在WicketApplication.java中
In WicketApplication.java
mountResource("/orderPage/{name}",new ImageResourceReference());
我对WicketApplication.java中的这一行有疑问。
I have doubt about this line in WicketApplication.java.
我创建了这样的资源文件
I have created resource file like this
ImageResourceReference.java
ImageResourceReference.java
public class ImageResourceReference extends ResourceReference{
public ImageResourceReference(){
super(ImageResourceReference.class,"imagesDemo");
}
@Override
public IResource getResource() {
return new ImageResource();
}
private static class ImageResource extends DynamicImageResource{
private static final long serialVersionUID = 1L;
@Override
protected byte[] getImageData(Attributes attributes) {
PageParameters parameters = attributes.getParameters();
StringValue name = parameters.get("name");
byte[] imageBytes = null;
if(name.isEmpty() == false)
imageBytes = getImageAsBytes(name.toString());
return imageBytes;
}
private byte[] getImageAsBytes(String label){
BufferedImage image = new BufferedImage(800, 600, BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D) image.getGraphics();
g.setColor(Color.BLACK);
g.setBackground(Color.WHITE);
g.clearRect(0, 0, image.getWidth(), image.getHeight());
//g.setFont(new Font("SansSerif", Font.PLAIN, 48));
g.drawString(label, 50, 50);
g.dispose();
Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpeg");
ImageWriter writer = writers.next();
if (writer == null) {
throw new RuntimeException("JPG not supported?!");
}
final ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] imageBytes = null;
try {
ImageOutputStream imageOut = ImageIO.createImageOutputStream(out);
writer.setOutput(imageOut);
writer.write(image);
imageOut.close();
imageBytes = out.toByteArray();
} catch (IOException e) {
e.printStackTrace();
}
return imageBytes;
}
@Override
public boolean equals(Object that){
return that instanceof ImageResource;
}
}
}
但是当我调试代码时,我发现控件不会进入内部 ImageResource类,这会返回字节。
But when i debug the code I found out that control is not coming to internal ImageResource class which is returning bytes.
我想在面板上显示图像。我面板上显示的链接是我存储在本地系统数据库中的链接。
I want to display the image picture on my panel. And the link that is showing on my panel is the link what i stored in my database which is of the local system.
任何帮助和建议表示赞赏!提前致谢。
Any help and advice appreciated! Thanks in advance.
推荐答案
最后我在ItemOrderPanel.java中确定了这段代码
Finally i settled on this code in ItemOrderPanel.java
add(new NonCachingImage("img", new AbstractReadOnlyModel<DynamicImageResource>(){
@Override public DynamicImageResource getObject() {
DynamicImageResource dir = new DynamicImageResource() {
@Override protected byte[] getImageData(Attributes attributes) {
StringValue name = parameters.get("name");
byte[] imageBytes = null;
if(name.isEmpty() == false)
imageBytes = getImageAsBytes(name.toString());
return imageBytes;
}
};
dir.setFormat("image/png");
return dir;
}
}));
private byte[] getImageAsBytes(String label){
byte[] imageBytes = null;
try {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
InputStream inStream = new FileInputStream(new File(label));
copy(inStream, outStream);
inStream.close();
outStream.close();
return outStream.toByteArray();
} catch (IOException e) {
e.printStackTrace();
}
return imageBytes;
}
private void copy(InputStream source, OutputStream destination)
throws IOException
{
// Transfer bytes from source to destination
byte[] buf = new byte[1024];
int len;
while ((len = source.read(buf)) > 0) {
destination.write(buf, 0, len);
}
source.close();
destination.close();
}
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