Data from servlet to jsp.. how to

Dear Developer,
i've a resultset that consists of nearly 500 records, now i want to display all records using a jsp , how could i pass the data returned by result set to jsp, as well how the jsp can receive this data.
please reply me.
thanku

Hi,
It is not suggested to send ResultSet to the UI. You can store tha data in Collection and send it to the UI. In both the cases you can make use request.setAttribute to send the data to jsp page. Code may look like this:
Vector mydataList=some data
request.setAttribute("dataList",mydatalist);
That's all.
Regards,
Sudheer Varma.

Similar Messages

Pass data from servlet to jsp using sendRedirect

Hi,
I am passing data from servlet to jsp using forward method of request dispatcher but as it doesn't change the url it is creating problems. When ever user refreshes the screen(browser refresh) it's re-loading both servlet and jsp, which i don't want to happen. I want only the jsp to be reloaded.
Can I pass data from servlet to jsp using sendRedirect in this case. I also want to pass some values from servlet to jsp but without using query string. I want to set some attributes and send to jsp just like we do for forward method of request dispatcher.
Is there any way i can send data using attributes(without using query string) using sendRedirect? Please let me know

sendRedirect is meant as a true redirect. meaning
you can use it to redirect to urls not in your
context....with forward you couldn't pass information
to jsps/servlets outside your own context.Actually, you can:
getServletContext().getContext("/other").getRequestDispatcher("/path/to/servlet").forward(request, response)I think the issue here is that the OP would like to have RequestDispatcher.forward() also update the address in the client's browser. That's not possible, AFAIK. By the time the request is forwarded, the browser has already determined the URL of the servlet, and the only I know of way to have the browser change the URL to the forwarded Servlet/JSP is to send a Location: header (i.e. sendRedirect()). Remember that server-side dispatching is transparent to the client. Maybe there's some tricky stuff you can do with JavaScript to change the address in the address bar without reloading the page?
Brian

Personalizaton data from Servlet Show Pages: How?

Can anyone show me the proper way to retrieve "personalization data" in the show page when the show page is a servlet instead of a JSP?
In the Oracle Application Server Portal Developer's Guide...
http://download-west.oracle.com/docs/cd/B10464_03/portal.904/b13922/pdg_java.htm#CHDJIGAF
... it goes therough the steps to customize portlets to add fields to the EditDefaults page, and then make those fields available on the Show page.
All is OK except that I am using a servlet instead of a JSP as my Show page, and JDeveloper complains about this line inserted into my servlet:
NameValuePersonalizationObject data = (NameValuePersonalizationObject)PortletRendererUtil.getEditData(pReq);
It shows up with a blue underline, and trying to compile gives this error:
Error(29,106): unreported exception: oracle.portal.provider.v2.security.AccessControlException; must be caught or declared to be thrown
So can someone show me the right way to do this for show pages that are servlets rather than jsp pages?
Thanks in advance.

Hi,
The method PortletRendererUtil.getEditData(...) throws PortletNotFoundException, IOException and AccessControlException. In your code, you need to catch these exceptions, or declare your method to throw those exceptions.
You could see the javadoc for greated insight into the method signature.
thanks,
Harsha
p.s.: The fully qualified class names are:
oracle.portal.provider.v2.PortletNotFoundException
oracle.portal.provider.v2.security.AccessControlException
hope that helps.

How to send the values from servlet to jsp

hi folks,
I need to send a lot of values from servlet to jsp so that i can display the values in jsp. Any sollution for this. Its very urgent.
Thanks in advance

Hi lieo,
Can u send me the sample code for that.
Thank q

How to load the data from informatica into bw & how to report the data

Hi friends,
how to load the data from informatica into bw & how to report the data
using cognos.(i.e how to access the data in sap bw using cognos 8 BI suite).
Thanks,
madhu.

Inorder to report BW data into Cognos you can extract data from using Open Hub to the DB table from which Cognos reads.
For BW informatic integration refer following docs:
http://www.aman.co.il/aman/pfd/DataInteg_BR.q103cd.pdf.pdf
http://h71028.www7.hp.com/enterprise/cache/3889-0-0-225-121.html
http://devnet.informatica.com/learning/ePresentations.asp
http://72.14.203.104/search?q=cache:C741L86Q19oJ:devnet.informatica.com/showcase/resources/Essbase_DataSheet.pdfinformaticapowerconnect(BI)&hl=en&gl=in&ct=clnk&cd=3
http://www.informatica.com/customers/utilities_energy/fpl_group.htm
http://www.informatica.com/solutions/resource_center/technote_sapbw_65241004.pdf#search=%22Informatica%20to%20Bw%22

Parameter passing from servlet to jsp page

Hi
I m facing problem of parameter passing from servlet to jsp ..
plz help me...
I m using as ...
in servlet code I m using ...
request.setAttribute("string",parameter);
and in jsp..
request.getParameter("string");
regard's
JAI KUMAR

Hi Jaykumar
You should use
<%= request.getAttribute("sting") %> or
${string}
in your jsp. I think you are trying to retrive the parameter instead of attribute.
Thanks

How to pass a JavaBean from servlet to JSP?

Hi there,
I am working on a project that needs to handle quite a few client requests and I want to use the Front Controller pattern that is described in the J2EE pattern page.
The steps described in the front controller pattern is that:
1. A servlet (controller) process the client request.
2. It calls the appropriate cammand object and the cammand object gets the data from the data source and returns a JavaBean that contains the required data.
3. The servlet dispatch to the appropriate View (jsp page)
4. The JSP page displays the data in the JavaBean to the user.
However, I don't know how to pass the JavaBean from the servlet to the JSP page when the servlet forwards the control to the JSP page. Should I make the JavaBean with a request scope or higher? If so, how to uses it in the JSP page? Just refer by the ID of the JavaBean.
If any one knows there is an example or tutorial on how to use this pattern, please let me know.
Thank you !
Regards
Edmund

Could you please give more info? i tried to do this, but always get a "Class not found exception":
response$jsp.java:65: Class org.apache.jsp.TestBean not found. TestBean bean = null;
although the class TestBean (no package name => defalt package) is in the WAR file and the Servlet seems to instantiate it (otherwise an exception would occur sooner in the TestServlet code).
my JSP code is:
<%@ page language="java" info="Response page" %>
<jsp:useBean id="bean" class="TestBean" />
<%
TestBean bean2 = (TestBean) request.getAttribute("TheBean");
%>
<html>
<body>
Your value: <%= bean2.getValue() %><BR>
My val: <%= bean2.getNewValue() %><BR>
<P>
Date: <%= new Date() %>
<P>
Neuen Wert eingeben
</body>
</html>
--------------

How do I lookup an EJB 3.0 Session bean from servlet or JSP?

Does anyone knows how can I invoke an EJB from a servlet or JSP ?
I deployed a simple EJB on a Oracle Application Server 10g release 10.1.3 and I'm working with JDeveloper 10.1.3. I deployed the files via JDeveloper, and I didn´t specify any orion-ejb-jar.xml or ejb-jar.xml file
After deployment, the orion-ejb-jar.xml look like this in the server:
<?xml version="1.0" encoding="utf-8"?>
<orion-ejb-jar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://xmlns.oracle.com/oracleas/schema/orion-ejb-jar-10_0.xsd" deployment-version="10.1.3.0.0" deployment-time="10b49516c8f" schema-major-version="10" schema-minor-version="0" >
<enterprise-beans>
<session-deployment name="HolaMundoEJB" location="HolaMundoEJB" local-location="HolaMundoEJB_HolaMundoEJBLocal" local-wrapper-name="HolaMundoEJBLocal_StatelessSessionBeanWrapper6" remote-wrapper-name="HolaMundoEJB_StatelessSessionBeanWrapper7" persistence-filename="HolaMundoEJB.home_default_group_1">
</session-deployment>
</enterprise-beans>
<assembly-descriptor>
<default-method-access>
<security-role-mapping name="<default-ejb-caller-role>" impliesAll="true" />
</default-method-access>
</assembly-descriptor>
</orion-ejb-jar>
I'm trying to invoke the ejb in a servlet by doing the following:
public void doGet(HttpServletRequest request, ....
Context context = new InitialContext();
HolaMundoEJB helloWorld =
(HolaMundoEJB)context.lookup("java:com/env/ejb/HolaMundoEJB");
String respuesta = helloWorld.sayHello("David");
When i invoke the servlet I catch a NamingException whose message says something
like this ....java:com/env/ejb/HolaMundoEJB not found in webLlamaEJB
I tried different paths for the lookup but nothing....
Can anyone help me with this topic? Thank you.

Please try the following code:
HelloEJBBean.java:
@Stateless(name="Hello")
@Remote(value={Hello.class})
public class HelloEJBBean implements Hello { ... }
hello.jsp:
Context ctx = new InitialContext();
Hello h = (Hello)ctx.lookup("ejb/Hello");
web.xml:
<ejb-ref>
<ejb-ref-name>ejb/Hello</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<remote>fi.kronodoc.test.model.Hello</remote>
</ejb-ref>
i think you should also define jndi mappings for the references in orion-ejb-jar.xml and orion-web.xml but for some reason it seems to be working also without these.

How to send a message from Servlet to JSP

Dear all,
I have JSP, with JavaScript (AJAX). If the user click on the button, the text will be sent to a Servlet parsed by doGet() and the user get a response to his input, without reloading a page.
How can I send a message to the users (JSP) from Servlet, if he didn't clicked any button and to other visitor of the page also? Is it possible? I think like a chat, the server sends a message to all users who are subscribed.
I don't know, what should I get from user, maybe session, that I could send him personal or common messages in his textarea. I should also invoke some JavaScript function to update his page. I have met some chats, you don't do nothing and get messages. It is also without a JavaScript timer, which invokes doGet() method. Asynchronous, only when there is a message.
Please help me with a problem.
Thanks in advance.

Hai ,
You can send any message through response.sendRedirect();
here is the coding try it
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SimpleCounter extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/plain");
PrintWriter out = res.getWriter();
String username="java";
res.sendRedirect("http://localhost:8080/yourprojectname/jspfile.jsp?username="+username);
}

Sending attachment from servlet or jsp

Dear Friends,
I downloaded javamail api and I have seen the sendfile.java, which is used to send attachments. it is working fine. I can able to run that program from command prompt like this :=
c:>java sendfile [email protected] [email protected] mail.smtp.net c:/hello.java true
It is working fine from console (command prompt)
How can i execute that file on browser (i have to run as a servlet file or from jsp file).
please help me how can i pass the emailids, file etc., if i want to use this program as servlet file or as jsp program.
If anyone having idea, please share ur ideas.
your kind cooperation would be greatly appreciated.
Thanks in advance.
Looking forward to hearing from you.
Yours
Rajesh
==
program is like this (which is in javamail home ..demo directory
==
import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
* sendfile will create a multipart message with the second
* block of the message being the given file.<p>
* This demonstrates how to use the FileDataSource to send
* a file via mail.<p>
* usage: <code>java sendfile <i>to from smtp file true|false</i></code>
* where <i>to</i> and <i>from</i> are the destination and
* origin email addresses, respectively, and <i>smtp</i>
* is the hostname of the machine that has smtp server
* running. <i>file</i> is the file to send. The next parameter
* either turns on or turns off debugging during sending.
* @author     Christopher Cotton
public class sendfile {
public static void main(String[] args) {
     if (args.length != 5) {
     System.out.println("usage: java sendfile <to> <from> <smtp> <file> true|false");
     System.exit(1);
     String to = args[0];
     String from = args[1];
     String host = args[2];
     String filename = args[3];
     boolean debug = Boolean.valueOf(args[4]).booleanValue();
     String msgText1 = "Sending a file.\n";
     String subject = "Sending a file";
     // create some properties and get the default Session
     Properties props = System.getProperties();
     props.put("mail.smtp.host", host);
     Session session = Session.getDefaultInstance(props, null);
     session.setDebug(debug);
     try {
     // create a message
     MimeMessage msg = new MimeMessage(session);
     msg.setFrom(new InternetAddress(from));
     InternetAddress[] address = {new InternetAddress(to)};
     msg.setRecipients(Message.RecipientType.TO, address);
     msg.setSubject(subject);
     // create and fill the first message part
     MimeBodyPart mbp1 = new MimeBodyPart();
     mbp1.setText(msgText1);
     // create the second message part
     MimeBodyPart mbp2 = new MimeBodyPart();
// attach the file to the message
     FileDataSource fds = new FileDataSource(filename);
     mbp2.setDataHandler(new DataHandler(fds));
     mbp2.setFileName(fds.getName());
     // create the Multipart and its parts to it
     Multipart mp = new MimeMultipart();
     mp.addBodyPart(mbp1);
     mp.addBodyPart(mbp2);
     // add the Multipart to the message
     msg.setContent(mp);
     // set the Date: header
     msg.setSentDate(new Date());
     // send the message
     Transport.send(msg);
     } catch (MessagingException mex) {
     mex.printStackTrace();
     Exception ex = null;
     if ((ex = mex.getNextException()) != null) {
          ex.printStackTrace();

Hi,
your sendmail.jsp would look like that:
<%@ page import="java.util.*,java.io.*,javax.mail.*,javax.mail.internet.*,javax.activation.*" %>
<%
String to = request.getParameterValues("to")[0];
String from = request.getParameterValues("from")[0];
String host = request.getParameterValues("host")[0];
String filename = request.getParameterValues("filename")[0];
String msgText1 = "Sending a file.\n";
String subject = "Sending a file";
// create some properties and get the default Session
Properties props = System.getProperties();
props.put("mail.smtp.host", host);
Session session = Session.getDefaultInstance(props, null);
session.setDebug(debug);
try {
// create a message
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(from));
InternetAddress[] address = {new InternetAddress(to)};
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(subject);
// create and fill the first message part
MimeBodyPart mbp1 = new MimeBodyPart();
mbp1.setText(msgText1);
// create the second message part
MimeBodyPart mbp2 = new MimeBodyPart();
// attach the file to the message
FileDataSource fds = new FileDataSource(filename);
mbp2.setDataHandler(new DataHandler(fds));
mbp2.setFileName(fds.getName());
// create the Multipart and its parts to it
Multipart mp = new MimeMultipart();
mp.addBodyPart(mbp1);
mp.addBodyPart(mbp2);
// add the Multipart to the message
msg.setContent(mp);
// set the Date: header
msg.setSentDate(new Date());
// send the message
Transport.send(msg);
} catch (MessagingException mex) {
mex.printStackTrace();
Exception ex = null;
if ((ex = mex.getNextException()) != null) {
ex.printStackTrace();
%>
which you can call as: sendmail.jsp?to=...&from=...&host=...&filename=...
so you may need to create a HTML file containing the necessary form.

Passing data from EJBs to JSPs

Hi all, I'm trying to enhance an exercise I've been working on. I have a couple of beans "ProductBean" and "ProductBasket". I want to add items to the basket and then display them to the screen. I am getting an error when trying to use the Vector object in the JSP. I'm not sure how you go about passing data around from a bean to a JSP, should I be using a servlet to dispatch data from a bean to a JSP?
Once clicking the submit button on my HTML form and the item has been added to the basket how would you recommend I read the basket contents back out to the screen using my existing code below?
Cheers in advance for any help.
<html>
<body>
<jsp:useBean id="shop1" class="shop.ProductBean" />
<jsp:setProperty name="shop1" property="*" />
You clicked: <%= shop1.getTitle() %>
<br /> <%= shop1.getPrice() %>
<jsp:useBean id="basket1" class="shop.ProductBasket" />
<%
     for(int i=0; i<v.size(); i++){
         System.out.println(v.elementAt(i).getTitle()+"<br />");
%>
</body>
</html>
package shop;
import java.util.Vector;
public class ProductBasket{
     Vector v = new Vector();
     public void addToBasket(ProductBean bean){
          v.addElement(bean);
package shop;
public class ProductBean{
     private String title = new String();
     private float price = 0.0f;
     private String description = new String();
     private String artist = new String();
     private String type = new String();
     public String getTitle(){
          return this.title;
     public void setTitle(String title){
          this.title = title;
     public float getPrice(){
          return price;
     public void setPrice(float price){
          this.price = price;
     public String getDescription(){
          return this.description;
     public void setDescription(String description){
          this.description = description;
     public String getArtist(){
          return artist;
     public void setArtist(String artist){
          this.artist = artist;
     public String getType(){
          return type;
     public void setType(String type){
          this.type = type;
          <form action="basket.jsp" method="post">
               <input type="hidden" name="title" value="Java Demo" />
               <input type="hidden" name="price" value="12.99" />
               <input type="hidden" name="description" value="Sun MS CD - excellent!!! MUST BUY" />
               <input type="hidden" name="artist" value="Sun MS" />
               <input type="hidden" name="type" value="cd" />
               <input type="submit" value="Submit" />
          </form>

1) There are no EJB's in this code. JavaBeans are not EJB's!
2) You never import the Vector class into your jsp, nor do you declare the variable 'v' in it. Thus, the errors.
3) Vectors are legacy components and should no longer be used. Use List implementations instead. Or better yet, abstract your collections entirely from your JSP by using JSTL.
4) If you're going to use Beans in your JSP, don't use scriptlets to access their properties, use the bean access methods. Read the JSP tutorial for examples.

Get the data from servlet...

Hello friends!
I have one problem: On my LoginServlet I'm write users sessions in HashMap. How can I get the data from this HashMap in another servlet? I did this HashMap as public and tried to take this HashMap from another servlet, but the HashMap was empty.

u might be knowing the things in web application can be shared using either request object, Httpsession or ServletContext.
and the scope of all 3 is different.
things shared using the request will b availble 4 that request.
things shared using the session will b availble 4 all the requests in that Session.
things shared using the request will b availble 4 all the servet or jsp in that web application.
so u r problem will be solved by using the servletContext..
code is
ServletContext cnt.=confg.getServletContext();
cnt.SetAttribute("map", h);
cnt.getAttribute("map");

JSP- Servlet-- Bean-- JSP how to implement

I have problem.
My JSP will take a emplyee id .
Now I want to show all the values regarding that employee in a JSP(JSP form) from the DB(Oracle).
So Iam planning like
JSP-->Servlet-->Bean-->JSP
So my doubts are.
1. Is it correct approach
2.If it is correct then which part of the flow connects to DB and stores the value before putting to JSP.
Iam using Tomcat 4.31
Plz help me

I have problem.
My JSP will take a emplyee id .
Now I want to show all the values regarding that
employee in a JSP(JSP form) from the DB(Oracle).
So Iam planning like
JSP-->Servlet-->Bean-->JSP
So my doubts are.
1. Is it correct approach
2.If it is correct then which part of the flow
connects to DB and stores the value before putting to
JSP.
Iam using Tomcat 4.31
Plz help meHI
What you are probably proposing is an MVC design pattern. I wonder if u have heard of the struts framework. Sruts uses MVC design pattern wherein the servlet u are talking about acts as a controller(C) and the bean acts as the model(M) .The JSPs present the view(V). Hence the name MVC.
Your approach is right. First get the employee ID from the jsp and get the corresponding data from database(This logic u implement in the servlet). Then save the fetched data in a bean so that the result jsp can fetch data from it.
Now this is not a strict MVC approach.
Learn more about struts. It presents a much more cleaner solution.

Creating files from servlets or jsp

The issue that I have is this
I've been working with eclipse, netbeans, tomcat, glassfish, servlets and jsps.
I have a little servlet/jsp web application that create few files from the servlet. Those files I need to make them visible to the browser because they are the end result of the servlets/jsp work.
When I run the server from netbeans/eclipse they deploy the war file into tomcat/glassfish server and run the app.
So far there is no problem here, just that.. the files created with the app are created into the project folder.
If I manually run the server, those files are created in the folder from I started the server, so what I did is get into the deployed/unpacked war and from there start the server.
Only that way I could make those files visibles to download.
Is there a better way to do this? (of course, it must be, but I don't know how).
What I want is, deploy the web-app and make the app create those files at the same folder of the web-app to allow those file could be downloaded, no matter from where or how the server is started.
In the near future I need to install few web-apps like this at the same server, so I can't still starting the server from the web-app folder (as I did it until now).
I read about the request.getContextPath(); but it return no the real address just the context address (something like "/my_app"), so when I use that address to create a file, what I get is something lik "/my_app/myFile.txt".
I hope you can give some advices of how to solve my issue.
Thanks in advance

830896 wrote:
Right now I know the absolute path to the tomcat/glassfish where the web-app is deployed, so I can use that address, but in the future that web-app could be deployed in another server and I can't know what address does it have.
I wonder if there exists a way to know the current absolute address of the web-app, or a way to create, "%this-web-app-absolute-addres%/someDir/myNewFile.txt"No, you're solving the wrong problem. Don't store files you create in the context of the web application, or even in the context of the application server. Store them somewhere else entirely. Then the person who configures the web application just has to set up the name of the directory where they are stored as a variable for your application.

Pass data from servlet to EJB3 and backward

Hello All,
The distributed application is being developed by the following scheme:
J2EE Application Server (JBoss) - Servlet container (JBoss's contained Tomcat) - RIA client (Flex)
Application server needs to handle client's requests and provide backward connectivity also.
Servlets in this scheme are required by the BlazeDS library which is implemented as set of servlets handling HTTP requests from the clients.
This forces us to:
- invoke EJB from the servlet while handling client's requests.
- invoke servlet from EJB for the sake of providing the client with urgent messages which need to be displayed immediately.
The easiest ways to achieve that I am aware of are:
- servlet invokes EJB via JNDI lookup (inefficient?)
- EJB invokes servlet by passing HTTP request to web server (inefficient!)
Is there standard and efficient ways to wire servlets(JSP) and EJB in either directions?
Thanks,
Alex.

Hi Chicon,
Thanks for advice. Probably I need to add few more words to make the question clearer.
Chicon wrote:
It is not the role of an EJB to fire a servlet. EJB's are only modules.
In your case, the EJB invoked should pass the necessary data to the servlet. From the data it receives, the servlet has either to build and to send the HTML document(or other formats : pdf, txt, xml,...) or to fire the appropriate JSP to the client. The servlet may also call a more specific servlet to do the job, e.g. in a Struts like framework.- Invocation of EJB from servlet is one data flow direction. After EJB is invoked and finished, servlet gets results, makes its own job and sends data to clients either in html or binary AMF (Flex proprietary) format.
- Invokation of servlet from EJB is another data flow direction. It will be employed, when server decides to inform all interested clients about an urgent event. Client are not asking for that event explicitly, but they are ready for handling such messages from the server.
Of course, in order to achieve this, there is a need in a channel between server and each client. This is what BlazeDS for.
The first requirement could be satisfied by either JNDI lookup or (as malrawi proposed) by dependency injection.
The second one is a little bit harder... It may involve any other mediators, not necessarily the same servlets.
I am looking for the best suitable solution now.
Thanks,
Alex.

Data from servlet to jsp.. how to

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