Setting attributes of image stored in byte array in servlet

Hi,
I am using a servlet to stream image (GIF) to the browser.
Image is accessed by browser using the img tag. src attribute points to the servlet which send the image stream.
Servlet has the image as the array of bytes. It simply write these bytes on the response object's output stream. It does not use any encoder.
I get the image on the browser. But when I try to see the properties of the image I don't see the type of image. I also don't see the created time, modified time and size of the image. When I do Save As on this image it tries to save it as BMP instead of GIF. Also when I do the print preview I don't see the image in the preview window. When I try to print the web page, it prints everything except this image. I get small cross(image missing) on the printed page.
I would like to know why the image attributes on browser go missing and why can't I print the image?
I would like to add that I am getting the image as the array of bytes from a different application on which I do not have control.
Thanks.

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How to convert a Image object to byte Array?

Who can tell me, how to convert Image object to byte Array?
Example:
public byte[] convertImage(Image img) {
byte[] b = new byte...........
return b;

Hello,
any way would suit me, I just need a way to convert Image or BufferedImage to a byte[], so that I can save them. Actually I need to save both jpg and gif files without using any 3rd party classes. Please help me out.
thanx and best wishes

How do I display a GIF image stored in byte[ ]

I have a bit of sticky problem and am now stuck. I will post a little code in the hopes someone more clever than I can give me a hand
I am using a servlet to grab some data from a user, a web service (still within the servlet) is then called that generates a GIF of the user location as
specified by the address data grabbed from the user input (GET via the url parameters). The byte data is stored in a bean as a byte [ ] and added to the request as an attribute
via request.setAttribute().
I then forward to a jsp page that looks like this:
     <html>
     <head>
     <title>Learn Fast or Perish</title>
     </head>
     <body>
     <center>
     <hr>
     </center>
     <h1>Hello World.</h1>
     <jsp:include page="/display" flush="true"/>
     </body>
     </html>.../display maps to another servlet. The doGet portion of the servlet looks like this:
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            ImageIcon imageIcon = new ImageIcon(imageByteInfo.getByteData());
            Image image = imageIcon.getImage();
            //create a BufferedImage from the image
            BufferedImage bufferedImage = new BufferedImageCreator().createBufferedImage(image);
            System.out.println("BufferedImage length: " + bufferedImage.getHeight() + "BufferedImage width: " + bufferedImage.getWidth());//400 by 600
            System.out.println("BufferedImage string: " + bufferedImage.toString());
            //prints out: BufferedImage@93afae: type = 2 DirectColorModel: rmask=ff0000 gmask=ff00 bmask=ff amask=ff000000 IntegerInterleavedRaster: width=600 yada yada
            response.setContentType("/image/gif");
            OutputStream stream = response.getOutputStream();
            ImageIO.write(bufferedImage, "gif", stream);
            stream.close();... i found the code above on line and this is supposed to display a GIF to a web page.
For a while the code was actually prompting if I wanted to download a file of type "/image/gif"?!?
I did download and save it as temp.gif and the image was there when I opened it on my desktop.
Something is in the byte array but I cannot get it to display on the page. So what am I doing wrong.
So my question is this...
How can I display the gif info stored as a byte [] (byte array) in a bean with a jsp page. I thought including a servlet that
writes the bytes to the reponse would but no such luck. Is what I am trying possible? This newbie would greatly appreciate
any advice :)

First of all the following line is a little off:
response.setContentType("/image/gif");should be
response.setContentType("image/gif");What you should do is rather than do an include, try something like the following:
<img src="/display" />If you're telling me that /display is mapped to the servlet that has the doGet you reference, this would be the proper way to do it.
HTH.

Display an object of Image type or Byte Array

Hi, lets say i got an image stored in the Image format or byte[]. How can i make it display the image on the screen by taking the values in byte array or Image field?

Thanks rahul,
The thing is, i am generating a chart in a servlet
and setting the image in the form of a byte [] to the
view bean ( which is binded to the jsp, springs
framework ). The servlet would return the view bean
to the jsp and in the jsp, i am suppose to print this
byte array so as to give me the image..
I hope this makes sense.. pls help me ou!Well letme see if i got tht right or not,
you are trying to call Your MODEL (Business layer / Spring Container) from a servlet and you are expressing that logic in form of chart (Image) and trying to save it as a byte array in a view bean and you want to print /display that as an image in a jsp (After Servlet fwd / redirect action) which includes other data using a ViewBean.
If this is the case...
As the forwaded JSP can include both image and Textual (hypertext too)..we can try a work around hear...Lets dedicate a Servlet which retreives byte [] from a view bean and gives us an image output. hear is an example and this could be a way.
Prior to that i'm trying to make few assumptions here....
1).The chart image which we are trying to express would of format JPEG.
2).we are trying to take help of<img> tag to display the image from the image generating servlet.
here is my approach....
ViewBean.java:
============
public class ViewBean implements serializable{
byte piechart[];
byte barchart[];
byte chart3D[];
public ViewBean(){
public byte[] getPieChart(){
return(this.piechart);
public byte[] getBarChart(){
return(this.barchart);
public byte[] get3DChart(){
return(this.chart3D);
public void setPieChart(byte piechart[]){
this.piechart = piechart;
public void setBarChart(byte barchart[]){
this.barchart = barchart;
public void set3DChart(byte chart3D[]){
this.chart3D = chart3D;
}ControllerServlet.java:
=================
(This could also be an ActionClass(Ref Struts) a Backing Bean(Ref JSF) or anything which stays at the Controller Layer)
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
/* There are few different implementations of getting   BeanFactory Resource
In,the below example i have used XmlBeanFactory Object to create an instance of (Spring) BeanFactory */
BeanFactory factory =
new XmlBeanFactory(new FileInputStream("SpringResource.xml"));
//write a Util Logic in your Implementation class using JFreeChart (or some open source chart library) and express the images by returning a byte[]
ChartService chartService =
(GreetingService) factory.getBean("chartService");
ViewBean vb = new ViewBean();
vb.setPieChart(chartService.generatePieChart(request.getParameter("<someparam>"));
vb.setBarChart(chartService.generateBarChart(request.getParameter("<someparam1>"));
vb.set3DChart(chartService.generate3DChart(request.getParameter("<someparam2>"));
chartService = null;
HttpSession session = request.getSession(false);
session.setAttribute("ViewBean",vb);
response.sendRedirect("jsp/DisplayReports.jsp");
}DisplayReports.jsp :
================
<%@ page language="java" %>
<html>
<head>
<title>reports</title>
</head>
<body>
<h1 align="center">Pie Chart </h1>
<center><img src="ImageServlet?req=1" /></center>
<h1 align="center">Bar Chart </h1>
<center><img src="ImageServlet?req=2" /></center>
<h1 align="center">3D Chart</h1>
<center><img src="ImageServlet?req=3" /></center>
</body>
</html>ImageServlet.java
==============
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
       byte buffer[];
        HttpSession session = request.getSession(false);
        ViewBean vb = (ViewBean) session.getAttribute("ViewBean");
        String req = request.getParameter("req");
        if(req.equals("1") == true)
            buffer = vb.getPieChart();
        else if(req.equals("2") == true)
             buffer = vb.getBarChart();
        else if(req.equals("3") == true)
             buffer = vb.get3DChart();
        JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(new ByteArrayInputStream(buffer));
        BufferedImage image =decoder.decodeAsBufferedImage() ;
        response.setContentType("image/jpeg");
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        ServletOutputStream sos = response.getOutputStream();
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
        encoder.encode(image);
    }Note: Through ImageServlet is a Servlet i would categorise it under presentation layer rather to be a part of Controller and added to it all this could be easily relaced by a reporting(BI) server like JasperServer,Pentaho,Actuate................
Hope the stated implementation had given some idea to you....
However,If you want to further look into similar implementations take a look at
http://www.swiftchart.com/exampleapp.htm#e5
which i believe to be a wonderful tutor for such implementations...
However, there are many simple (Open) solutions to the stated problem.. if you are Using MyFaces along with spring... i would recommend usage of JSF Chart Tag which is very simple to use all it requires need is to write a chart Object generating methos inside our backing bean.
For further reference have a look at the below links
http://www.jroller.com/page/cagataycivici?entry=acegi_jsf_components_hit_the
http://jsf-comp.sourceforge.net/components/chartcreator/index.html
NOTE:I've tried it personally using MyFaces it was working gr8 but i had a hardtime on deploying my appln on a Portal Server(Liferay).If you find a workaround i'd be glad to know about it.
& there are many BI Open Source Server Appls that can take care of this work too.(Maintainace wud be a tough ask when we go for this)
For, the design perspective had i've been ur PM i wud have choose BI Server if it was corporate web appln on which we work on.
Hope this might be of some help :)
REGARDS,
RaHuL

How to convert an Image to a byte array?

I want to make a screenshot and then convert the image to a byte of arrays so I can send it through a BufferedOutputStream.
try
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Exception in thread "Thread-0" java.lang.NullPointerException
at Server.run(Server.java:52)
at java.lang.Thread.run(Unknown Source)

Fixed that. I got a new problem.
When I connect to my simple server application that reads the image file, converts it to an array of bytes and sends it back, the file is created on the client side and it containts data, but I am not able to open the image. I have checked that the image that the server is sending is working. So where is the problem?
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public void run()
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                out_file.write(inputLine);
        catch(IOException err){ err.printStackTrace(); }
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Hello all,
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David,
Thanks again for taking time to help me out with this problem! I've solved my problem, but had to perform a few steps along the way. Long story short, I slightly modified the code you provided using -match and -replace for the strings, and then
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cls
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again!

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Mark Gilleece wrote:
Hi,
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Mark
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Setting attributes of image stored in byte array in servlet

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