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the action could be as follows:
{code:java}
public class MyAction extends ActionSupport {
  public String doDefault() {
    return "myImageResult";
  }
  
  public byte[] getMyImageInBytes() { .... }

  public String getMyContentType() { ... }
  public String getMyContentDisposition() { ... }
  public int getMyContentLength() { .... }
  public int getMyBufferSize() { ... }

}