Correction: the servlet serves a JPEG if it exists, and if not, serves a
default image which happens to be a PNG
Steve Sobol - Lobos Studios wrote:
There has to be a simple answer to this... I have a servlet that
serves a PNG file if it exists, and if it doesn't, throws an HTTP 404
error and serves a default image. In the second case, I get the
default image but I see this in the logs. I checked and couldn't find
an obvious way to set the HTTP status code without committing the
response...
2015-01-28
14:35:06.318:WARN:oejs.ServletHandler:/featured-event-image/event1-1.png
java.lang.IllegalStateException: Committed
at org.eclipse.jetty.server.Response.resetBuffer(Response.java:1090)
at org.eclipse.jetty.server.Response.reset(Response.java:1034)
at
com.mymitzvahdate.servlet.FeaturedEventImage.doGet(FeaturedEventImage.java:53)
This is the servlet:
package com.mymitzvahdate.servlet;
import java.io.File;
import java.io.IOException;
import java.net.URLDecoder;
import java.nio.file.Files;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.mymitzvahdate.Constants;
import com.mymitzvahdate.persistence.Globals;
public class FeaturedEventImage extends HttpServlet {
public static final long serialVersionUID = 1L;
// Properties
---------------------------------------------------------------------------------
private String imagePath, defaultImagePath;
// Actions
------------------------------------------------------------------------------------
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
imagePath = Globals.get(Constants.GLOBAL_FEATURED_IMAGE_DIR);
defaultImagePath =
Globals.get(Constants.GLOBAL_DEFAULT_FEATURED_IMAGE);
// Get requested image by path info.
String requestedImage = request.getPathInfo();
// Check if file name is actually supplied to the request URI.
if (requestedImage == null) {
sendErrorAndDefaultPNG(response);
}
// Decode the file name
String imageFilename = URLDecoder.decode(requestedImage, "UTF-8");
// chop off the extension if one exists
if (imageFilename.lastIndexOf(".")> -1) imageFilename =
imageFilename.substring(0,imageFilename.lastIndexOf("."));
File image = new File(imagePath, imageFilename + ".jpg");
// Check if file actually exists in filesystem.
if (!image.exists()) {
sendErrorAndDefaultPNG(response);
}
response.reset();
sendImage(response, image);
}
private void sendImage(HttpServletResponse response, File image) {
response.setContentType("image/png");
response.setHeader("Content-Length",
String.valueOf(image.length()));
try {
Files.copy(image.toPath(), response.getOutputStream());
} catch(IOException exc) {
}
}
private void sendErrorAndDefaultPNG(HttpServletResponse response) {
response.reset();
response.setStatus(HttpServletResponse.SC_NOT_FOUND); // 404.
File errorImage = new File(imagePath, defaultImagePath);
sendImage(response, errorImage);
return;
}
}
Thanks for whatever help you can offer
--
Lobos Studios - Website and Mobile App Design & Development; IT
Support; Computer Maintenance
Toll Free 877.919.4WEB - Apple Valley 760.684.8859 - Los Angeles
310.945.2410
www.LobosStudios.com * www.facebook.com/LobosStudios * @LobosStudios
--
Lobos Studios - Website and Mobile App Design & Development; IT Support;
Computer Maintenance
Toll Free 877.919.4WEB - Apple Valley 760.684.8859 - Los Angeles
310.945.2410
www.LobosStudios.com * www.facebook.com/LobosStudios * @LobosStudios
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