There's an example of ImageAction that serves image from the file system. It's called
Struts 2 dynamic image example.
Instead of base64 encoding/decoding which increases the content length two times and slows down page loading you can use the action that returnes image bytes from the file. It could be a database, in this way it should fetch bytes from Blob.
In your <img> tag that is using src attribute can contain the URL to the action that returns response with a header Content-Type: image/jpeg and bytes written to the body.
This is the code of the ImageAction:
@Result(type = "stream", params = {"contentType", "${type}"})
public class ImageAction extends ActionSupport implements ServletRequestAware {
byte[] imageInByte = null;
String imageId;
private HttpServletRequest servletRequest;
private final static String type = "image/jpeg";
public getInputStream() { return new ByteArrayInputStream(getCustomImageInBytes()); }
public String getType() { return type; }
private String getFilename() {
return this.filename;
}
public String getImageId() {
return imageId;
}
public void setImageId(String imageId) {
this.imageId = imageId;
}
public ImageAction() {
System.out.println("ImageAction");
}
public byte[] getCustomImageInBytes() {
System.out.println("imageId" + imageId);
BufferedImage originalImage;
try {
originalImage = ImageIO.read(getImageFile(this.imageId));
// convert BufferedImage to byte array
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(originalImage, "jpeg", baos);
baos.flush();
imageInByte = baos.toByteArray();
baos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return imageInByte;
}
private File getImageFile(String imageId) {
String filePath = servletRequest.getSession().getServletContext().getRealPath("/");
File file = new File(filePath + "/Image/", imageId);
System.out.println(file.toString());
return file;
}
@Override
public void setServletRequest(HttpServletRequest request) {
this.servletRequest = request;
}
}
This action supposed to have configuration created by convention-plugin. So it could be used in HTML like this
<img src="<s:url action='Image?imageId=darksouls.jpg' />" alt=""/>
