Problem with image displaying in jsp page.

Thomas Byrne

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posted 12 years ago

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Hi fellows,

I'm a bit lost with following scenario:

1. user upload image - upload.jsp
2. servlet do all dirty job
2a. save image to disk
2b. get name of the file
2c. save the name in session
2d. and redirect to display.jsp)
3. on the display.jsp, just uploaded image should be presented.

Unfortunately the display.jsp page is empty. When I look at source page under firefox, everything seems to be fine, valid link to the image is provided.

But under Media info I can see some weird infos:

Here is code used for uploading, processing and displaying picture:
1. upload.jsp

2. Upload.java
(The MultipartMap servlet belongs to BalusC, http://balusc.blogspot.com.au/2009/12/uploading-files-in-servlet-30.html)

package test;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import test.MultipartMap;

@WebServlet(urlPatterns = { "/Users/Thomas/NetBeansProjects/UploadTest/web/Upload" })
@MultipartConfig(location = "/Users/Thomas/NetBeansProjects/UploadTest/web/avatar", maxFileSize = 10485760L) // 10MB.
public class UploadServlet extends HttpServlet {

@Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {  
    }

@Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        
	MultipartMap map = new MultipartMap(request, this);
        
	File file = map.getFile("file");
	
	String filename = file.getName();
	
	HttpSession session = request.getSession();
    session.setAttribute("filename", filename);

request.getRequestDispatcher("/display.jsp").forward(request, response);
    }
}

3. display.jsp

If I replace, in display.jsp, ${filename} with static name of the particular image uploaded before, there is no problem with displaying so I suppose the images are processed correctly just something is missing on forward side?

By the way: when debugger is active everything is OK but when switch off the problem is back.

Cheers,
Thomas

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