HTML embedded servlet
Hi,
I am after some advice on Servlets. I have a web site running on Microsoft IIS 5.0. :( I need to write a HTML page that shows some static text (no problems here) and connects to an Oracle database that holds some images broken up into 2K chunks. To do this I was trying to write a servlet that was embedded in this HTML page.
I have written the servlet and it connects to the database retrieves the image data and stores it in a ByteArrayOutputStream without a problem. I then convert this ByteArrayOutputStream to a byte array so I can write the image data to the screen using the response.getOutputStream().write(byte[]) method. The trouble is the response writer (I think that's what it's called) is already in use so when I call the getOutputStream method the servlet throws an exception.
Can someone:
1. Tell me if what I am trying to achieve is possible by calling a Servlet embedded in a HTML page. (I know it is possible when you are running a java web server and call the servlet from the url)
eg.
<body>
<p>Output from servlet</p>
<hr>
<servlet
codebase=""
code="displayimage.DisplayImage.class"
>
</servlet>
<hr>
</body>
2. If it is possible, how do I call the getOutputStream method without throwing an exception OR write the byte array to the client using the current writer that is in use (PrintWriter).
I have tried numerous things such a setting the content type of the response to "image/jpeg" and converting the ByteArrayOutputStream to a string and writing this to the client with out success.
Help would be greatly appreciated.
Andrew
Hi Andrew,
1.
I notice that you try to display an Image from the Oracle database and have some problem.
There is another developer by the name Daizz that had the same problem. You may try contact to see how Daizz solve the issue.
2. Please look the subject:
problem about display jpg image in jsp daizz 3 Nov 12, 2001 11:39 PM
You can send Daizz an email to see.
--Paul
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out.println("</tr><tr>"); out.println( "<td>NIC</td>"+"<TD>"+nic+"</TD>");out.print("<br>");
out.println("</tr><tr>"); out.println( "<td>SACFA COMMENT</td>"+"<TD>"+sac_com+"</TD>");out.print("<br>");
out.println("</tr><tr>"); out.println( "<td>APPLICATION COMMENT</td>"+"<TD>"+app_com+"</TD>");out.print("<br>");
out.println("</tr><tr>"); out.println( "<td>DOE</td>"+"<TD>"+doe+"</TD>");out.print("<br>");
out.println("</tr><tr>"); out.println( "<td>MHQ</td>"+"<TD>"+mhq+"</TD>");out.print("<br>");
out.println("</tr>");
out.println("</table>");
wht cud be wrong? pls help.
thanx,
ashnathe reason i know is because i ran into this problem myself when converting '\r\n' to <br>. it just seems this is the way IE (and maybe netscape) handle html. if you do a 'view source' on the page you would see all the <br>'s and say "where did those come from?", then after looking at your code you would see it.
i am not sure 100% as to why they do it, but I have theories as to why (i.e. table isn't done and that text isn't formatted correctly, so just spit stuff out - then print table when closed)
so basically, the problem was with the html and not the servlet writing.
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