Servlet passing Values to JSP

I want to know when I forward from a servlet to a JSP how do I pass
          values especially Java Objects (Sometimes Objects of User written Java
          classes).
          Uptil now I have been putting all values in the session from where the
          JSP picks them up, but somehow I have a feeling that this is not the
          right way.
          Suppose my servlet is forwarding to a jsp . What should it do in case an
          exception happens in the servlet and wants to forward it to the jsp.
          Putting the Exception object in the session is an alternative but I
          wonder that is the best approach.
          If someone knows a better way od doing it, please help.
          Pankaj

You could probably use setAttribute
          ..before forwarding the control to JSP.
          req.setAttribute("message", "Hello, world");
          ServletContext app = getServletContext();
          RequestDispatcher disp;
          disp = app.getRequestDispatcher("Dispmessage.jsp");
          Cheers,
          Naggi
          pankaj wrote:
          > I want to know when I forward from a servlet to a JSP how do I pass
          > values especially Java Objects (Sometimes Objects of User written Java
          > classes).
          > Uptil now I have been putting all values in the session from where the
          > JSP picks them up, but somehow I have a feeling that this is not the
          > right way.
          > Suppose my servlet is forwarding to a jsp . What should it do in case an
          > exception happens in the servlet and wants to forward it to the jsp.
          > Putting the Exception object in the session is an alternative but I
          > wonder that is the best approach.
          > If someone knows a better way od doing it, please help.
          >
          > Pankaj

Similar Messages

Servlet passing values to JSP and ClasscastException

I am using weblogic 5.1 to run my Servlets.
          I want to know when I forward from a servlet to a JSP how do I pass
          values especially Java Objects (Sometimes Objects of User written Java
          classes).
          Uptil now I have been putting all values in the session from where the
          JSP picks them up, but somehow I have a feeling that this is not the
          right way.
          In a code I am putting a Java Object (It contains two attributes of
          Java.util.Vector type) in the session so that the JSP to which I am
          forwarding it to can use it I have put my class in the ServletClasses.
          Intertestingly it runs well till the contents of the Vector are changed.
          As the contents of the vector are changed, it throws ClassCastException
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          java.lang.ClassCastException
          at
          jsp_servlet._select_95_account_95_profile._jspService(_select_95_account_95_pro
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          at
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          at
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          at
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          at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
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          ompiled Code)
          at
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          ava, Compiled Code)
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          at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextMan
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          at
          weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java,
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          Pankaj


Only can confirm your finding - the jsp is using a different class loader to the servlet that originally instantiated the object. There's the rub. I haven't figured out yet how to fix that. I can get the classloader but don't know how to get the runtime to use that class loader to perform cast.

Passing value from JSP to JApplet

Hello,
I am stuck up with a problem, can anyone please tell me how do i pass a value from a JSP page
to a JApplet,
and the parameter passed through JSP should be displaed in the JTextArea.
It would be kindful if any of you could help.
Thanks
Sanam

hello,
thanks for reply.
I know how to pass parameters from html,
I want to pass values from jsp page,
and i dono how to do it, may be we cann pass values through url connection but i dono how.
if anone knows plz help me in solving this.
i hvae posted my applet code.
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.JToolBar;
import javax.swing.JButton;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.sql.*;
<applet code = "DocApplet" width = 500 height =5000>
</applet>
public class DocApplet extends JApplet
     private JPanel jp;
     private Container cp;
     private JTextArea jt;
     private JToolBar tb;
     private JScrollPane sp;
     private String annotation;
     private String url;
     private Connection con;
     private Statement stmt;
     public void init()
          jp = new JPanel();
          cp = getContentPane();
          jt = new JTextArea();
          tb = new JToolBar();
          sp = new JScrollPane(jt);
          repaint();
     public void start()
          jp.setLayout(new BorderLayout());
          jp.add(tb, BorderLayout.NORTH);
          jp.add(sp, BorderLayout.CENTER);
          jt.setBackground(Color.BLACK);
          jt.setForeground(Color.WHITE);
          setContentPane(jp);
          addButtons(tb);
          repaint();
     public void run()
          repaint();
     public void paint()
     private void addButtons(JToolBar tb)
          JButton button = null;
          button = new JButton("Save");
          button.addActionListener(new ActionListener()
               public void actionPerformed(ActionEvent e)
          tb.add(button);
}

Passing values between jsp and php

hi there, is it possible to pass values between jsp and
php? i really need to find out the way if there is
any. thanks in advance
-azali-

Yes, there are a few ways to do this.
1) Think about using Cookies.
2) Maybe use a Redirect passing the values in the Query string.
3) Retain the data in a repository in the back end.
4) Using Hidden fields within your pages.
I am sure you can use these Idea's for a base to develop other methods on how to pass values back and forth from JSP -> PHP and vice versa.
-Richard Burton

How to pass value from jsp to java bean

I have huge problem . How to pass value from jsp value to java bean.Please replay me soon

Use the <jsp:setProperty> tag. There are several ways to use it. The one you probably want is:
<jsp:setProperty name="bean_name" property="property_name" value="the_value_you_want_to_set"/>

Passing value from JSP to scriptlet

Hi
I am trying to find a way to pass a value from jsp to the scriptlets, i.e.
<c:set var="testValue" value="123" />
<%
System.out.println(testValue);
%>
the above code just demonstrates what I was trying to achieve, by passing the value from the jsp into the scriptlet.
Can someone tell me if there's an easy way to do this?
Thank you.

Note, using scriptlet code on your page is generally something to be avoided. 99% of what you should be doing on a JSP page can be done with EL/JSTL. If you can't do it with EL/JSTL then it probably belongs in a servlet/bean.
I always aim for 100% scriptlet free jsp pages.
Having said that, I can still answer your question: EL attributes are stored in the scope - page, request, session, application
${testValue} is equivalent to pageContext.findAttribute("testValue").
The <c:set> tag example doesn't specify a scope, so therefore you could get it like this:
<c:set var="testValue" value="123" />
<%
String testValue = (String)pageContext.getAttribute("testValue");
System.out.println(testValue);
%>alternatively exploit the feature of the useBean tag that creates a scriptlet variable:
<c:set var="testValue" value="123" />
<jsp:useBean id="testValue" type="java.lang.String"/>
<%
System.out.println(testValue);
%>Note that the EL variable and the Scriptlet variable are initially pointing at the same String.
But changing the string in scriptlet code will change the value it is pointing at, while leaving the EL variable untouched.
If you have a List in scope, and sharing it between EL and scriptlet variables then any changes to the list would be reflected because they both point at the same List object.
cheers,
evnafets

Passing value to jsp page by clicking a hyperlink

I have a hyperlink in a jsp page1. The hyperlink is for another jsp page2. I have a string value in JSP page1, which I want to pass to jsp page2 when user clicks the hyperlink. Can anyone tell me what will be the suitable way to do this? Thanks.

here's the source to two very simple jsps that do what you want..
<HTML>
<HEAD>
<TITLE>
ForwardValue
</TITLE>
</HEAD>
<BODY>
<H1>
Go To GetValue.jsp
</H1>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE>
GetValue
</TITLE>
</HEAD>
<BODY>
<H1>
<%= request.getParameter("value") %>
</H1>
</BODY>
</HTML>

Passing value from JSP to JSPDynPage onclick of link

Hi,
I have extracted a value in the JSP page and i want to send this value back to the JSPDynPage on click of a link(the link is dependent on the value).
How can i do that?

hi Sujoy,
you can pass values by using beans and display the passed data in a new jsp page.
firstly create a jsp page,that accepts user data,say for example i am placing a text box and a button,
next,create a jspdyn page---
private final static int INITIAL_STATE = 0;
    private final static int FINAL_STATE = 1;
    private int state = INITIAL_STATE;
    private final static String BEAN_KEY="nameBean";
    public void doInitialization(){
      IPortalComponentRequest request=(IPortalComponentRequest) this.getRequest();
      IPortalComponentContext ctxt=request.getComponentContext();
      displayNameBean mybean = new displayNameBean();
      ctxt.putValue(BEAN_KEY,mybean);
public void doProcessAfterInput() throws PageException {
         InputField myInputField = (InputField) getComponentByName("user_name");
if (myInputField != null) {
IPortalComponentRequest request=(IPortalComponentRequest) this.getRequest();
IPortalComponentContext ctxt = request.getComponentContext();
             displayNameBean mybean1=(displayNameBean)ctxt.getValue(BEAN_KEY);
               mybean1.setName(myInputField.getValueAsDataType().toString());
    public void doProcessBeforeOutput() throws PageException {
      switch (state){
           case INITIAL_STATE:
           this.setJspName("loginPage.jsp");
           break;
           case FINAL_STATE:
           this.setJspName("successloginPage.jsp");
           break;
    public void onButtonClick(Event event) throws PageException {
         state=FINAL_STATE;
finally display this value in a new jsp page as follows--
<jsp:useBean id="nameBean" scope="application" class="NewProject.bean.displayNameBean" />
<%@ taglib uri= "tagLib" prefix= "hbj"%>
<hbj:content id="myContext" >
<hbj:page title="PageTitle">
   <hbj:form id="myFormId" >
<hbj:textView
     id="welcome_note"
     design="HEADER2">
     <%
     welcome_note.setText
     (nameBean.getName());
     %>
as simple as that!!
regards
SwarnaDeepika
P.S:Please reward points for helpful answers.

Passing values between jsp pages

Hi all,
I am a newbie to jsp. I am trying to pass value from one jsp to another.
Let me post the code here and make my point clear. I have 3 jsp pages and am trying to get the value into my 3rd page that was in the first page.
This is my Test.jsp page:
<%@page contentType="text/html"%>
<html>
<head><title>Test JSP Page</title></head>
<body>
<%-- <jsp:useBean id="beanInstanceName" scope="session" class="package.class" /> --%>
<%-- <jsp:getProperty name="beanInstanceName" property="propertyName" /> --%>
Testing.. JSP Page
<FORM action='Response.jsp' method="POST">
<input type='Text' name='get_name'>
<input type="submit" value="Click Me">
</FORM>
</body>
</html>
This is my response.jsp page:
<%@page contentType="text/html"%>
<%@page import = "sun.jdbc.rowset.CachedRowSet" %>
<html>
<head><title>Response Page</title></head>
<body>
<%-- <jsp:useBean id="beanInstanceName" scope="session" class="package.class" /> --%>
<%-- <jsp:getProperty name="beanInstanceName" property="propertyName" /> --%>
Thank you... <%=request.getParameter("get_name") %>
// I want to pass this get_name to my next page, but since request.getParameter returns an object and not a string, how will I capture the value and pass it to my next page.
</body>
</html>
The 3rd jsp page is:
<%@page contentType="text/html"%>
<html>
<head><title>JSP Page</title></head>
<body>
// I am trying to get the value of the name here in this page.
<%-- <jsp:useBean id="beanInstanceName" scope="session" class="package.class" /> --%>
<%-- <jsp:getProperty name="beanInstanceName" property="propertyName" /> --%>
</body>
</html>
Your help is appreciated.
Thanks

Hi,
Thanks for the reply, it works. I was wondering whether this is an efficient way of doing this. What I want to do further is to setup a connection to a database and use the value I got from my previous page to query the DB and get the results and display.
I have see some code in the java website and a lot of people do by writting a bean /class(believe bean is just a class) and then importing it and do the things that way. I have good knowledge of OO and Java as a language and would definitely love to do it this way.
What i think i am missing is the basic idea to doing this way. So if you could let me know how to do this using java classes I would really appreciate it. If its too much to explain can u point to some good source(URL's) that explain's this. I have searched on this and all i find is code with no good explaination.
Thanks a lot

Pass value between JSP pages

I would like to pass values between pages.
I don't want showing up on the url. Ex: some.jsp?param=value
I don't feel it's safe.
It's not coming from form either....
How can I hide the value and pass it to next page?
I want to pass the value when the user click on a hyperlink
Thanks In Advance.
Message was edited by:
Theepan

Client side information is never safe no matter what you do. If the values don't end up in the url, they are always present SOMEWHERE in the html content.
If you don't want the values to end up in the url, rework the page so it DOES do a post form submit. You could turn the hyperlink into a javascript call that submits the form for you.

Passing values to jSP on button click

Hello
I have multiple delete buttons on the JSP page. What i want is to get the value as to which delete button was clicked. I am not sure if i shld have multiple names for the buttons. For now all have the same name since its inside a while loop.
Also i want to confirm that the user really wants to delete the field. But i dont know how can i pass the value as well as the function at the same time through the onClick function.
I tried type="hidden" for the field value and onClick="function" (where function is a javascript function that confirms if the user does want to delete the field). BUt in this case with type = hidden i get all the values corresponding to the field.
Any pointers?
heres the sample HTML code if it helps.. this one is just to show how the screen looks like. The actual JSP has the while loop.. which is also pasted below
<HTML>
<HEAD><TITLE>File Format Management</TITLE>
<META http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<SCRIPT language="JavaScript" type="text/javascript">

</SCRIPT>
</head>
<body>
<BR>
<CENTER>
<TABLE border="1" cellpadding="0" cellspacing="0" marginwidth=0 marginheight=0>
<TR class="titlebar">
    <TD align="center">File Format Management</TD>
</TR>
<TR bgcolor="#cccccc">
    <TD>
<B>File Types:</B>
<p>The following file types are defined for this project.</p>
<div align="center">
<table cellpadding="3" cellspacing="0" border="0" width="100%">
<tr><td>Filetype��</td><td># of fields��</td><th></th><th></th></tr>
<tr><td>Demographics</td><td align="center">5</td><td><input type="submit" value="Edit"></a></td><td align="right"><input type="submit" value="Delete"></a></td></tr>
<tr><td>Clinical</td><td align="center">17</td><td><input type="submit" value="Edit"></td><td align="right"><input type="submit" value="Delete"></td></tr>
<tr><td>MS</td><td align="center">9</td><td><input type="submit" value="Edit"></td><td align="right"><input type="submit" value="Delete"></td></tr>
<tr><td>HLA</td><td align="center">20</td><td><input type="submit" value="Edit"></td><td align="right"><input type="submit" value="Delete"></td></tr>
<tr><td>SNP</td><td align="center">18</td><td><input type="submit" value="Edit"></td><td align="right"><input type="submit" value="Delete"></td></tr>
<tr><td colspan="4"><input type="submit" value="Add new filetype..."></td></tr>
</table>
</div>
<p align="center"><input type="submit" value="Return"></p>
</td>
</tr>
</table>
</body>
</html>
//actual while loop in JSP
<table cellpadding="3" cellspacing="0" border="0" width="100%">
            <tr class="titleitem"><td>Filetype��</td><td># of fields��</td><th></th><th></th></tr>
            <% if ((!fileTypesFormats.equals(null)) && (fileTypesFormats.size() > 0))
                    Iterator keyIter = fileTypesFormats.entrySet().iterator();
                    while (keyIter.hasNext())
                        Map.Entry CurrentEntry = (Map.Entry) keyIter.next();
                        String formatNos = CurrentEntry.getKey().toString();
                        String fileTypeName = CurrentEntry.getValue().toString();
                        count++;
             %>
                   <tr class="<%=htmlObj.getClassString(count)%>">
                     <td><input type="hidden" name="filetypeName" value="<%=fileTypeName%>"><%=fileTypeName%></td>
                     <td align="center"><%=formatNos%></td>
                     <td><input type="button" value="Edit" name="editBtn" onclick="location.href='edit_delete_filetype_format.jsp'"></a></td>
                     <td align="right"><input type="button" name="deleteBtn" value="Delete" onclick='confirmDelete(this.form)'></a></td>
                   </tr>
             <% } } %>
                    <tr class="<%=htmlObj.getClassString(count)%>"><td colspan="4"><input type="button" value="Add new filetype..." onclick="location.href='edit_delete_filetype_format.jsp'"></td></tr>
        </table>

Thanx for your help praveen
I appreciate that.. but i misguided you. I am sorry abt that
I want the value of the field beside the delete box to be passed to the Server side scripting.
so if u see the html page u see something like this
"Demographics 4 Edit Delete "
"Clinical 3 Edit Delete"
//note edit and delete are buttons
Of this when the user clicks on Delete I want the jsp to pass Demographics value to the JSP.
Right now it will pass all the values like "Demographics Clinical" . I probably have to give different names to the buttons...lets c
Thanx for u r help

Passing value from JSP to Action in Struts

Hi,
I am populating JSP page with rows retrieved from the database and
represented as a List of Beans in forEach loop:
<c:forEach var="list" items="${OperationsForm.OperationsList}">
<c:choose>
<c:when test="${list.isCompleted =='Y'}" >
<td width="100">Completed</td>
<td width="100"> </td>
</c:when>
<c:otherwise>
<td width="100">Pending</td>
<td width="100"><input type="image" onclick="
rowId=value; form.action='action.do?command=notify'"
value="${list.OperationId}" />
</td>
</c:otherwise>
</c:choose>
</tr>
</c:forEach>
Have hidden field: html:hidden property="rowId" value="-1"/>
User is clicking the button corresponding to one of the rows
and I need to pass the value of that rowId to the Action class, so it does
something in the database [action completed]
Now how do I pass it , is that the right way of doing it with calling
request.getSession().getAttribute(rowId) in the Action class ?
As of now I am getting Javascript error "Object doesn't support this
property or method", complaining about rowId=value;
Using Struts 1.3
Please help !
TIA,
Oleg.

So what you are saying is that I should add rowId here:
<input type="image" onclick="form.action='action.do?command=notify&rowId='
${list.OperationId}"/> , correct ?
I am not sure that it will work, especially with Struts tag.
I will probably try something like:
<html:submit onclick="form.action='action.do?command=notify'" value="${list.OperationId}">
I am relatively new to Struts, so now sure what will work or not and how to do it better. How do I catch the submitted value in the Action in either of these 2 cases, via action.getSession().getProperty("rowId") /
action.getSession().getProperty("submit") ?
I would probably do it as a URL rather than changing the action of the form.I will have to create a new action anyway to process that row [which is sending user e-mail regarding that row data/event].
Is the id the only thing you have to pass in?
Or do you need other values from the screen?Selected rowId is probably the only thing I care about, can access values from the Form in Action.
Thank you,
Oleg.

Pass values between jsp pages

Admin1.jsp
In this jsp page i have a drop down list with<select name=Update
From this page i move to the page Adnim2.jsp
Admin2.jsp
In this page i request for the value of selected entry in the drop down list as follows
String a=request.getParameter("Update");
From this page i move onto a servlet UpdateContribution.java
UpdateContribution.java
Here i need the value of the selected entry in drop down list ie Update
but String a=request.getParameter("Update"); does not work here and i get a Null Pointer Exception
Please help me

In Admin2.jsp, add a hidden form field and assign the selected value of drop-down to it. Now, you can obtain
the selected value of drop-down in Servlet(UpdateContribution.java) using given hidden form field.
Or,
Store the selected value of drop-down list in session. Now, you can obtain the value in servlet(UpdateContribution.java) through session

Passing values to jsp from html..

Hi all,
I have a jsp containing a selection list and need to pass the value to the java segment of the jsp. When reserching this, I've found some info where an html page was created, an initial jsp was saving the info (or bean was used) and then a third jsp displayed the data (using buttons). This is too many steps and I'm needing a way for the same jsp to display containing the selected option (simulating a refresh with the post when the drop down list is used). Is redirecting while setting and getting attributes all at once feasible/possible or is there a better direction or work around for this?
Thanks in advance,
Geoff-

I would think submitting the page to itself, and setting hidden fields to signal that it is a resubmission, may be the way to go. If the new information being displayed is minimal, JavaScript may also work, by setting up an empty <div> or <span> and setting the innerHTML or innerText properties. The advantage of the JavaScript solution is it would be quicker, having the client do all the processing, but it also browser dependant.

To pass value between jsp page

How can I pass hidden's value from a jsp page to other?
My code is:
a.jsp
<h:form id="insUser">
<h:inputHidden id="flag" value="1"></h:inputHidden>
</h:form>
b.jsp
<%String flag="";
flag=request.getParameter("flag");
out.print("flag="+flag);
%>
b.jsp shows: flag=null
Could you help me?

Because this hidden field id is insUser:flag, but not just flag.
If you have subview or other naming container(s) around form, the id name might be even longer.
Sergey : https://ajax4jsf.dev.java.net/

Servlet passing Values to JSP

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