How to make sense of my binary data

[Timothy Sam]

Ok, so I have managed to upload an image... It was written to a BinaryOutputStream and then written to a String object (following the struts sample). I think I have done this right only that, doing ${picture} outputs a set of ascii code such as

!1AQa?"Rq?��2B����#3CS?$4br�?��� ?��?��?� #���^?C�???@��?`�Cd��L �c�?� ����?�?��??�?�t&?~�?�?0 ct�"=�(T?B?@!@B??!!@B??!!@B??!!@B??!!@B??!!@B??!!@B?!PH�???A$� ?�e�H�?�@D��} ~�?�B?���I�G�?"|��G��G;$I��H�����I�?;n??L�|��?D?O��F�#?;?g�o�G�?PF�T) ?N�7<�Qpo?Dq??�vI�jG���N{&2w�h��.��*J?�?�o�i{? ?�1�`c���h��1�0?��?�??@l���Jc; o�a@G??I�T?:&?�B" B? ! ?B?? !BB?? !BB?? !BB?? !BB?? !BB?? !BB?? ! B ! ! BX??(QwH��4�??� %B??�R>??�I�*G��Q=w@.�'d��:y$R?�����I��D� $g�H�8?3��H��#��K�#�PA�?%D��G�#?�?(?��tQ;n�(?�Bx��h�"���L���H[��??�#

and what I really want is to use the uploaded file(binary data) into an image tag in one of my jsp's... How am I suppose to do this? Thanks!
[ May 31, 2006: Message edited by: Bear Bibeault ]

[Carl Trusiak]

You'll need to store the binary data from the image somewhere (A file on the file system or cached in memory) and create an html image tag to something that will serve the image up. If you save it as a file , it can simply be the URL to the image. If you save it in memory, you'll need to have a servlet output the contents.

[Timothy Sam]

Hi, thanks for your reply...

If you save it in memory, you'll need to have a servlet output the contents.

This is exactly what I need to do. I saw some samples on the internet but doesn't actually understand how they work... One thing for example, this code found at this page...

  // This method is called by the servlet container to process a GET request.
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
        // Get the absolute path of the image
        ServletContext sc = getServletContext();
        String filename = sc.getRealPath("image.gif");
    
        // Get the MIME type of the image
        String mimeType = sc.getMimeType(filename);
        if (mimeType == null) {
            sc.log("Could not get MIME type of "+filename);
            resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            return;
        }
    
        // Set content type
        resp.setContentType(mimeType);
    
        // Set content size
        File file = new File(filename);
        resp.setContentLength((int)file.length());
    
        // Open the file and output streams
        FileInputStream in = new FileInputStream(file);
        OutputStream out = resp.getOutputStream();
    
        // Copy the contents of the file to the output stream
        byte[] buf = new byte[1024];
        int count = 0;
        while ((count = in.read(buf)) >= 0) {
            out.write(buf, 0, count);
        }
        in.close();
        out.close();

I understand how the other lines work... But I don't know how the image is sent back with the response... Here's another code which confuses me...

          File file = new File(pszDbFileName);
          String pszFileName  = file.getName();
          int nSeparatorIndex = pszFileName.indexOf(".");
          String sub = pszFileName.substring(nSeparatorIndex + 1);
 
if(sub.equalsIgnoreCase("jpg")||sub.equalsIgnoreCase("jpeg"))
          {
              response.setContentType("image/jpeg");
          }
                else if(sub.equalsIgnoreCase("gif"))
          {
              response.setContentType("image/gif");
          }
          else
          {
           //error
           return;
          }
 

          OutputStream outStream = response.getOutputStream();
 
          try
             {
              DataInputStream dis = new DataInputStream(new
FileInputStream(file));
           byte picture[] =  new byte[dis.available()];
           dis.read(picture);
           dis.close();
 
           outStream.write(picture);
           outStream.close();
           return;

thank you...

[dema rogatkin]

You need to write a simple servlet or JSP which sets content type to something like image/png and write your saved in memory or file image to servlet output stream. Access your image servlet from page using something like: <img src="/mycontext/myimageservlet?imageid=xxx">
You can look in example of a contact application in my signature. It allows to upload image (photo) and display it on page after.