Displaying an image in JSP

[Amardeep Verma]

Hi,
I have an image, in JPEG format, stored inside a byte array.
I have to render that image. I will not be able to open a file
connection and write that image to HDD, either on client side or on
server side. So my query is this, how do I render an image which is
stored as a series of bytes? I have tried out.println and IMG tag, but
they do not work.

Any help would be appreciated

Bye
Amardeep Verma

[Andy Fish]

Re: Displaying an image in JSP

presumably your JSP page is currently producing HTML. HTML cannot contain
image data in the file itself, only through an external href.

so the best option would be to generate an <img> tag in your JSP which
contains a URL to a different JSP (or the same jsp with different
parameters). When the browser requests the image, you can send the binary
data as content type image/jpeg.

Andy


"Amardeep Verma" <addverma@email .com> wrote in message
news:1a9170e5.0 307312310.1cb96 d01@posting.goo gle.com...[color=blue]
> Hi,
> I have an image, in JPEG format, stored inside a byte array.
> I have to render that image. I will not be able to open a file
> connection and write that image to HDD, either on client side or on
> server side. So my query is this, how do I render an image which is
> stored as a series of bytes? I have tried out.println and IMG tag, but
> they do not work.
>
> Any help would be appreciated
>
> Bye
> Amardeep Verma[/color]

[Chris]

Re: Displaying an image in JSP

"Amardeep Verma" <addverma@email .com> wrote in message
news:1a9170e5.0 307312310.1cb96 d01@posting.goo gle.com...[color=blue]
> Hi,
> I have an image, in JPEG format, stored inside a byte array.
> I have to render that image. I will not be able to open a file
> connection and write that image to HDD, either on client side or on
> server side. So my query is this, how do I render an image which is
> stored as a series of bytes? I have tried out.println and IMG tag, but
> they do not work.[/color]

I haven't tried this, but my guess is that you could include a tag like this
in your html: <img src="myimage.js p">. Then have myimage.jsp return the byte
data. Be sure to set the http response header to indicate that it's a jpeg.

[Roedy Green]

Re: Displaying an image in JSP

On 1 Aug 2003 00:10:55 -0700, addverma@email. com (Amardeep Verma)
wrote or quoted :
[color=blue]
>So my query is this, how do I render an image which is
>stored as a series of bytes?[/color]

see http://mindprod.com/jgloss/image.html

--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

[Raymond DeCampo]

Re: Displaying an image in JSP

Chris wrote:[color=blue]
> "Amardeep Verma" <addverma@email .com> wrote in message
> news:1a9170e5.0 307312310.1cb96 d01@posting.goo gle.com...
>[color=green]
>>Hi,
>> I have an image, in JPEG format, stored inside a byte array.
>>I have to render that image. I will not be able to open a file
>>connection and write that image to HDD, either on client side or on
>>server side. So my query is this, how do I render an image which is
>>stored as a series of bytes? I have tried out.println and IMG tag, but
>>they do not work.[/color]
>
>
> I haven't tried this, but my guess is that you could include a tag like this
> in your html: <img src="myimage.js p">. Then have myimage.jsp return the byte
> data. Be sure to set the http response header to indicate that it's a jpeg.
>[/color]
FYI, since JSPs implicitly open the output stream as a character stream
and the specification prohibits one from re-opening it as a byte stream,
this is best done from a servlet instead of a JSP.

Ray

[Raymond DeCampo]

Re: Displaying an image in JSP

Allen E. Scharfenberg wrote:[color=blue]
> I think you can set the MIME type you are returning in both servlets and
> JSP. SO, you could set the MIME type being returned to image\jpeg or
> whatever, convert the byte[] to a character[], and then just slam it
> through.
>[/color]

No; you can set the MIME type if you like, but a JSP is only allowed to
return character data. There was a tech tip from Sun a while back that
dealt with this very issue. The original tip suggested using JSPs, but
the next tip made the correction. In fact, I just found the tip in my
email library; it wasd the tech tip for 8/21/2001.

Here are the links:

http://developer.java.sun.com/developer/JDCTechTips/2001/tt0821.html

http://developer.java.sun.com/developer/JDCTechTips/2001/tt0821_update.html

Ray

[devatha]

Allen E. Scharfenberg wrote:[color=blue]
> I think you can set the MIME type you are returning in both servlets and
> JSP. SO, you could set the MIME type being returned to image\jpeg or
> whatever, convert the byte[] to a character[], and then just slam it
> through.
>[/color]

No; you can set the MIME type if you like, but a JSP is only allowed to
return character data. There was a tech tip from Sun a while back that
dealt with this very issue. The original tip suggested using JSPs, but
the next tip made the correction. In fact, I just found the tip in my
email library; it wasd the tech tip for 8/21/2001.

Here are the links:

http://developer.java.sun.com/developer/JDCTechTips/2001/tt0821.html

http://developer.java.sun.com/developer/JDCTechTips/2001/tt0821_update.html

Ray

Hi Ray

Thanks a lot. You solved my problem. I was thinking along the same lines on setting the mime type on jsp response. These URLs showed how to do it exactly.