Define a request attribute for a JSP Page

Where do I need to define the request parameters
that will be read by my JSP Page?
If I have a JSP:
<% String userName = request.getParameter("name") %>Where shud the attribute name be defined so that its value is read
by the JSP Page?
Does it need to be defined in the tag lib as an attribute?

Where do I need to define the request parameters
that will be read by my JSP Page?It can be a HTML form field in another JSP from which the request comes to this JSP. Alternatively, it can be a parameter passed through the URL like
http://myhost/myapp/myjsp.jsp?name=Richard

Similar Messages

Struts tag for request.setAttribute() in a jsp page

Hello All
Does anyone know struts tag that can be used for request.setAttribute() in a jsp page?
Thanx in advance.

Well
<bean:define id="foo" name="newsIdAttribute" scope="request" type="java.lang.String" />is equivalent to
<%
(java.lang.String) foo = (java.lang.String)request.getAttribute("newsIdAttribute");
%for setting bean properties you might have to use
<jsp:setProperty/> or <c:set/> tags in JSP / JSTL respectively.
Hope this might answer your question :)
REGARDS,
RaHuL

How to Generate a Java file for a JSP Page

Hi ,
I am using weblogic11 .
I am working on a JSP page which nearly consists of 4000 lines of code.
I need to debug the file , but weblogic server is not generating the java file for the JSP pages .
Please let me know how can i genertae Java file for the jsp pages ??

JSPs are compiled into servlets automatically and those classes are stored in WEB-INF/classes folder. Servlet engine handles servlets.

Requirements for building jsp pages

wht are the basic requirements for building jsp pages
or even 4 wrkin on j2ee..
new to j2ee and hv exp on j2se

It's depends what OS you have:
Windows -- IIS + Tomcat
Linux(FreeBSD) -- Apache + Tomcat (or Resin, but I prefer Tomcat);
Of couse you should have a text editor to edit *.jsp file :-)

ER: organize imports in an "import" attribute of a JSP page directive

Hi,
it would be useful to see packages/classes hierarchy when changing the "import" attribute of <%@ page %> directive. It might be as well to have all possibilities of imports processing as in .java classes (autoadding, remove unused import, etc.)
Thanks in advance.

Hello Scott,
          First, you have to define this page directive in your static page or JSP
          page :
          <%@ page contentType="text/html; charset=UTF8" %>
          Check your your weblogic.properties file for the following settings:
          weblogic.httpd.inputCharset specifies encoding used when changing into the
          internal code of Java from the parameter of the browser's request. If you
          use Shift_JIS in HTML or JSP, please set
          weblogic.httpd.inputCharset./*=Shift_JIS.
          weblogic.codeset specifies encoding used when jDriver stores data in an
          Oracle database and it changes into the character code of a database from
          the internal code of Java. If you use ja16sjis in Oracle database, please
          set the same encoding as NLS_LANG to weblogic.codeset.
          Hope this helps
          Ludovic.
          Developer Relations Engineer
          BEA Support
          "Scott Mark" <[email protected]> a écrit dans le message news:
          3cd67e5d$[email protected]..
          > Did you ever get around this? Is there an issue with UTF-8 encoding?
          >
          > We are going to have to deliver a site in Japanese soon, and are
          researching how well WLS handles double-byte chars...

Setting Java class parameters for a JSP page

Hi,
I have a Java class that has a reference to a Session Id. I want to call a JSP from the class and set the session id to a String variable in the JSP. I am using a URL class to call the JSP. After the actual URL is passed to the URL constructor, I am appending the "?m_sessionId=e_session Id" at the end of the URL. In my JSP, I have the m_sessionId String parameter that i want to set e_sessionId to. What should i do in my JSP to set this? Any answers will be very helpful and I'd like to offer many thanks in advance
public void loadSessionStuff(String sessionID){
   String e_sessionId = URLEncode.encode(sessionID);
   URL url = new URL("http://localhost:9000/MyJSP.jsp?m_sessionId="+e_sessionId);
   .....MyJSP.jsp looks something like this
   <%!
      String m_sessionId;
      public void setSessionId(){
       m_sessionid = request.getParameter("e_sessionId");
       public String getSessionId(){
           return m_sessionId;
        other stuff....
    %>Is this the correct way to do things. It's not working.
Regards
R

Hi Rahul,
Yeah, i got that resolved. Do you know how i can get the thing in reverse gear. What i mean is i can successfully call and get the JSP to do things for me from my Java bean. What about sending stuff back to my bean?
I want to send the List back to my calling class so i can work with it.
Thanks
Regards
Jeeves
My Java code is as follows
Results i_krf = null;
if(null != getSessionId()){
                String e_sessionId = URLEncoder.encode(this.m_sessionId);
                String eQuestion = URLEncoder.encode(sQuestion);
                Object obj;
                String URL = "http://"+m_rea.getHostname()+":"+m_rea.getPort()+"/"+"SecondaryInitiator.jsp"+"?m_sessionId="+e_sessionId+"&question="+eQuestion;
                URL url = new URL(URL);
                         URLConnection urlConn = url.openConnection();
                ois = new ObjectInputStream(new BufferedInputStream(urlConn.getInputStream()));
                while((obj = ois.readObject()) != null){
                     System.out.println("From OIS::"+obj.getClass());
                                i_krf = (Reults) obj;
<%@ page import = "java.io.*,java.sql.*,java.util.*"%>
<%
String m_sessionId;
String eQuestion;
System.out.println("In the JSP Page. Scriptlet part");
m_sessionId = request.getParameter("m_sessionId");
eQuestion = request.getParameter("question");
System.out.println("Session Id in JSP::"+m_sessionId+"::"+eQuestion);
Results i_krf = loadSession(m_sessionId);
if(null != i_krf){
   System.out.println("NOT NULL::");
   List list = i_krf.getPathList(eQuestion);
   for(Iterator it = list.iterator();it.hasNext();){
    PathKeys pk = (PathKeys) it.next();
    System.out.println("PATH::"+pk.getPathKey());
%>
<%!
     Shopper m_sSession = null;
     Results i_krf;
     public Results loadSession(String m_sessionId){
      if(null != m_sessionId){
        m_sSession = Shopper.findShopSession(m_sessionId);
        System.out.println("Session ID from JSP"+m_sessionId);
        if(null != m_sSession ){
          i_krf = new ResultsImpl(m_sSession );
      return (null==i_krf?null:i_krf);
%>

Accessing session attribute in output jsp page

Hi i am not getting any output in jsp page...
i am getting just heading
i think some problem with Session attribute..
if so how to access session been in jsp page
my code is here
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%--
The taglib directive below imports the JSTL library. If you uncomment it,
you must also add the JSTL library to the project. The Add Library... action
on Libraries node in Projects view can be used to add the JSTL 1.1 library.
--%>
<%--
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
--%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Tauvex Search Output</title>
</head>
<body>
Tauvex Search Output
<table>
<c:forEach items="${myDataList}" var="myData">
<tr>
<td>${myData.Fitsfilename}</td>
<td>${myData.RA_START}</td>
<td>${myData.RA_END}</td>
<td>${myData.DEC_START}</td>
<td>${myData.DEC_END}</td>
<td>${myData.telescope}</td>
<td>${myData.STARTOBS}</td>
<td>${myData.ENDOBS}</td>
<td>${myData.FILTER}</td>
</tr>
</c:forEach>
</table>
<%--
This example uses JSTL, uncomment the taglib directive above.
To test, display the page like this: index.jsp?sayHello=true&name=Murphy
--%>
<%--
<c:if test="${param.sayHello}">

Hello ${param.name}!
</c:if>
--%>
</body>
</html>
plz reply soon
thanks a lot

this is what i set in servlet
request.setAttribute("myDataList", myDataList);
request.getRequestDispatcher("someJspFile.jsp").forward(request, response);
how can i access that session attribute in jsp

How to set an 'alias' for a JSP page in web.xml

Hi
Suppose I have a JSP page called SimplePage.jsp and I want to refer to it by someother name while running the application how do I do this in the web.xml file. I have used <servlet-mapping> to do this in the case of a servlet. However I am not sure how to do this with a JSP
Could somebody show me how to do this. I would be very much grateful.
All help appreciated and acknowledged.
thanks in advance
ilango

It worked. The correct web.xml version is as below:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app SYSTEM "http://java.sun.com/dtd/web-app_2_3.dtd" [
]>
<web-app>

<servlet>
<servlet-name>ControllerServlet</servlet-name>
<servlet-class>ControllerServlet</servlet-class>
<init-param>
<param-name>base</param-name>
<param-value>http://localhost:8080/MVCIIapp/servlet/ControllerServlet</param-value>
</init-param>
<init-param>
<param-name>jdbcDriver</param-name>
<param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>
</init-param>
<init-param>
<param-name>imageUrl</param-name>
<param-value>http://localhost:8080/MVCIIapp/images/</param-value>
</init-param>
<init-param>
<param-name>dbUrl</param-name>
<param-value>jdbc:odbc:Burnaby</param-value>
</init-param>
<init-param>
<param-name>ilangocal</param-name>
<param-value/>
</init-param>
<init-param>
<param-name>mangla</param-name>
<param-value/>
</init-param>
</servlet>
<servlet>
<servlet-name>Header</servlet-name>
<jsp-file>/MVCIIapp/jsp/Header.jsp</jsp-file>
</servlet>
<servlet-mapping>
<servlet-name>ControllerServlet</servlet-name>
<url-pattern>/Master</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Header</servlet-name>
<url-pattern>/Opener</url-pattern>
</servlet-mapping>
</web-app>
I have other jps files too.I am going to try and put aliases for them and see how they perform.
I hope I have not spoken too soon by saying that the aliases work. Let me wait and watch with bated breath.
But thanks a lot for your suggestions without which this would not have been possible
ilango

JSP implementation class for a JSP Page

Hello,
It is very important for me to know ...
- Do you consider that a JSP developer should know that each JSP Page becomes at run-time a Java Servlet ? And int the way that the Java code you have wrote in the JSP Page is dispatched in the declaration of this servlet ?
He should know how the Java code generated by the server looks like ?
Thank you all for your answers.
Adriana

Everybody's going to have their own opinion on this - here's my 2 cents.
Theoretically, there are at least two roles here.
#1. An expert in HTML, graphic layout, user interface etc.
#2. A programmer who understands the technical infrastructure - Java, beans, servlets, database connections etc.
In the perfect world, Role #1 would build JSPs and would not need to understand Java or the technical architecture. The JSPs would act as templates and not contain any Java code (e.g. scriptlets). Role #2 would build custom tags and beans for use in the JSPs.
To answer your question, Role #1 should not understand how JSPs are translated to servlets, but Role #2 should.
In reality, the two roles are often filled by the same person, usually a programmer who may introduce Java elements into the JSP. Once this occurs, then the JSP has become a program rather than a template and knowledge of its translation to servlets is necessary for debugging.

Why does people use JSP Tag for their JSP page? (Urgent)

I don't know what benifit if I am using JSP Tag.
If anyone knows, pls give me an idea and the advantage of using JSP Tag in JSP Page!
Thanks in advance!

You have to read a little about JSP, JSP stands for JavaServer Pages, you can use jsp tags and you can use java code. If you dont want to use jsp tags then you should just write html file, if you just want to use java, then write java class or a servlet.
The need for jsp arised because people were inserting html code inside a servlet class..a big no no..and a headache. JSP separate model from the view...read a little about MVC-2 model view controller pattern.
Also read some tutorial on this website...good luck
K

How can i apply this java program for a jsp page?

import java.io.*;
import java.util.*;
public class FileProcessing
//create a vector container for the input variables
     Vector variables = new Vector();
//create a vector container for the constants
     Vector constants = new Vector();
/*create a string expression container for the equation
     as read from the file */
     String expression = " ";
//create double result container for the final result
     double result = 0;
     public boolean processFile(String filename,String delim)
      //index for values vector
          int num_values = 0;
      //index for constants vector
          int num_constants = 0;
      //current line being read from the external file.
          String curline = " ";
      //start reading from the external file
          try
               FileReader fr = new FileReader(filename);
               BufferedReader br = new BufferedReader(fr);
               while(true)
                    curline = br.readLine();
                    if(curline == null)
                         break;
                //determine the type of current interaction
                    boolean variable = curline.startsWith("input");
                    boolean constant = curline.startsWith("constant");
                    boolean equation = curline.startsWith("equation");
                    boolean output = curline.startsWith("result");
               //on input variables
                    if(variable)
                      StringTokenizer st = new StringTokenizer(curline,delim);
                      int num = st.countTokens();
                      int count=0;
                      while(st.hasMoreTokens())
                           String temp = st.nextToken();
                           if(count==1)
                                byte b[]= new byte[100];
                                System.out.println(temp);
                                System.in.read(b);
                                String inputval = (new String(b)).trim();
                                variables.add(num_values,inputval);
                                num_values++;
                           count++;
                    // on constant values
                    if(constant)
                         StringTokenizer st = new StringTokenizer(curline,delim);
                         int num = st.countTokens();
                         int count = 0;
                         while(st.hasMoreTokens())
                              String temp = st.nextToken();
                              if(count==1)
                                   byte b[]= new byte[100];
                                   System.out.println(temp);
                                   System.in.read(b);
                                   String cons = (new String(b)).trim();
                                   constants.add(num_constants,cons);
                                   num_constants++;
                              count++;
                    // on equation
                    if(equation)
                         StringTokenizer st = new StringTokenizer(curline,delim);
                         int num = st.countTokens();
                         int count = 0;
                         while(st.hasMoreTokens())
                              String temp = st.nextToken();
                              if(count==2)
                                   this.expression = temp;
                              count++;
          // now we are ready to evaluate the expression
                   if(output)
                      org.nfunk.jep.JEP myparser= new org.nfunk.jep.JEP();
                      myparser.setAllowAssignment(true);
                      for(int i=1;i<variables.size()+1;i++)
                         String name = "arg"+Integer.toString(i);
                         myparser.addVariable(name,new Double(variables.get(i-1)
                                            .toString()).doubleValue());
                      for(int i=1;i<constants.size()+1;i++)
                           String name = "arg" +Integer.
                                     toString(i+variables.size());
                           myparser.addConstant(name,new Double(constants.get(i-1).toString()));
               //output is obtained as follows
                      myparser.parseExpression(expression);
                      result = myparser.getValue();
                      System.out.println("Assay value: "+result);
          catch(Exception e)
               System.out.println(e.toString());
          return true;
     public static void main(String[] args)
          FileProcessing fp = new FileProcessing();
          fp.processFile("input.eqn",":");
}//my text file name is: "input.eqn" (given below)
input:Enter Value1:arg1
input:Enter Value2:arg2
input:Enter Value3:arg3
constant:arg4
constant:arg5
Equation:arg1+arg2+arg3
result:

how can i apply this java program for a jsp pagewhy do you want to do this ?
Your program reads from a file on the disk and formats based on a patterm.
Jsp is not intended for such stuff.
ram.

How to Use tag in JDeveloper 9i for a JSP Page

Hi ,
I am working on JDeveloper 9i. I have a problem that i use JSP page and two tag[b] fmt and core. The uri passed to taglib is http://java.sun.com/jsp/jstl/core and http://java.sun.com/jsp/jstl/fmt. i also have two jar file standard.jar and jstl.jar. when i compile the jsp page, the errors reflect " TAG is not registered". Can any one tell me that how can i use the tags in a jsp page in jdeveloper 9i.
Thanks

Hi ,
I am working on JDeveloper 9i. I have a problem that i use JSP page and two tag[b] fmt and core. The uri passed to taglib is http://java.sun.com/jsp/jstl/core and http://java.sun.com/jsp/jstl/fmt. i also have two jar file standard.jar and jstl.jar. when i compile the jsp page, the errors reflect " TAG is not registered". Can any one tell me that how can i use the tags in a jsp page in jdeveloper 9i.
Thanks

Security for a jsp page

Hi everybody I have a question , I do I give access certain access
          permission to s specific page
          For example , some one come to my site and is at
          A.jsp after validating it takes them to B.jsp. How do I gaurantee that the
          world can't just access the page by typing the url of B.jsp ?
          Thank you
          -John


Put security on B.jsp in your deployment XML file? That's what it is for.
          Check the Servlet spec for details.
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          Clustering Weblogic? You're either using Coherence, or you should be!
          Download a Tangosol Coherence eval today at http://www.tangosol.com/
          "John" <[email protected]> wrote in message
          news:3c5f070b$[email protected]..
          > Hi everybody I have a question , I do I give access certain access
          > permission to s specific page
          > For example , some one come to my site and is at
          > A.jsp after validating it takes them to B.jsp. How do I gaurantee that the
          > world can't just access the page by typing the url of B.jsp ?
          > Thank you
          > -John
          >
          >

How to collect STATISTICS for my jsp pages

Hola gurus.
I'd like to collect statistics for my website, for example on my main page and certain other pages. Ideally I'd like to code it myself rather than using an external tool.
Has anybody done this, or can u recommend an approach ?
Here's my thoughts so far:
1. Since I dont want to slow down the presentation of my pages, the first idea is to position the code after the </HTML> tag.
<HTML>
</HTML>
<% MyGreatApp.addStatisticForPageVisit(pageName); %>
So, even if the action of updating the statistics takes 1 second, my web page won't be delayed by 1 second (right ? or should I multi-thread it ?)
2. I can keep a memory cache of pages viewed versus session id's, so that my statistics can reflect distinct user sessions (instead of "page visits" which can be misleading if a user clicks 50 times on the one page).
Maybe there is a neat java caching class that I can use.
3. I can then "save" my cache of statistics to the db periodically (say, every 5 minutes) to reduce db load. (?) I'm using mysql for my app already.
Any help / guidance greatly appreciated !
Thanks for the help java community you r great.

Sure, we do it. Every time the user requests one of a certain set of pages, we write a record to a table in a database. That's all. No mucking about with threads or caches or anything like that. If you have a database setup where it takes 1 second to write a record, you need to get that fixed right away.
As for session ID versus user ID, it depends on what you need. We just log the user ID so we can see who is using what applications, but your requirements may differ. There's nothing preventing you from logging both. Also, I do not know whether session ID's are unique over a long period of time, but logging the date and time of access should help you to deal with that problem if it exists. Basically, don't put too much logic into your logging code, just throw records out at the database. Any filtering or selection should be done on the back-end system that analyzes the logs.
PC²

How to set working-dir for precompiled jsp pages to some where under tmp

If my weblogic application gets exploded into this tmp directory:
D:\bea_domains\my_wl_domain\servers\SERVER001\tmp\_WL_user\mywebapp\wxyzzz\war
where "wxyzzz" is a random directory name generated by weblogic 9.2, how would I set my working-dir in weblogic.xml to store the precompiled jsp classes under:
D:\bea_domains\my_wl_domain\servers\SERVER001\tmp\_WL_user\mywebapp\wxyzzz\war\WEB-INF\classes\jsp_servlet\_jsp directory?
Is there an "expression" or "variable" that will hold the value of the tmp directory? Thanks.

If my weblogic application gets exploded into this tmp directory:
D:\bea_domains\my_wl_domain\servers\SERVER001\tmp\_WL_user\mywebapp\wxyzzz\war
where "wxyzzz" is a random directory name generated by weblogic 9.2, how would I set my working-dir in weblogic.xml to store the precompiled jsp classes under:
D:\bea_domains\my_wl_domain\servers\SERVER001\tmp\_WL_user\mywebapp\wxyzzz\war\WEB-INF\classes\jsp_servlet\_jsp directory?
Is there an "expression" or "variable" that will hold the value of the tmp directory? Thanks.

Define a request attribute for a JSP Page

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