Servlet/ html problem

hi all,
I have the situation where the result of an end user's actions is a variable length (in terms of number of rows) HTML table. How can the JSP/Servlet be designed so that the Servlet (or elsewhere in the non-presentation logic) doesn't generate HTML?
thanks in advance.....

Hi,
The jsp can make a call to some class/object that may return a variable length list (like vector). the jsp code look like this :
code:
<table><%Vector nameVector = SomeObject.getNameVector(param);for (int index=0;index<nameVector.size();index++){%><TR><TD><%=(String) nameVector.get(index)%></tr></td><%}%></table>
hope this will help you.
Anil.
Developer Technical support
Sun Microsystems, India.
http://www.sun.com/developers/support

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Servlet Compilation Problem !

Hi,
I am just starting to learn servlets and I got problem in compiling them. I got compilation error in
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Thanks in advance!
Josh

servlet.jar is here :
<tomcatdir>\common\lib
add it to your compiler classpath

Servlet chaining problem..

import java.io.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
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Hi everyone:
I am working on a project using Jbuilder, which is a shopping site.
The functions are:
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2, Add the item you want into a Temporary Cart
3, Remove unwanted items from cart
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cheers
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Hi,
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Hello,
I need help with my problem, this is part of my procedure that will send mail
c := utl_smtp.open_connection(server);
utl_smtp.helo(c, domena);
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utl_smtp.rcpt(c, prejemnik);
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send_header('Subject', zadeva);
send_header('MIME-Version', '1.0' || utl_tcp.CRLF);
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utl_smtp.close_data(c);
utl_smtp.quit(c);...
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Content-Type: text/html <------- this should be in header
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Thanks for your help

Thanks I have solved the problem

Java Servlet/Html link problem

Hi,
I have been using the Java servlet to create the html code itself using the PrintWriter.I would like to know if it possible to input ALL the code into -
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or must I input in this form?-
out.println("<html>");
out.println("<Body>");
out.println("<The entire html code>");
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out.println("</Html>");
Does it really make a difference?
I would also like to know it is possible to retrive data from a database and (via servlet) input the list of data into the combo-box of an html Webpage.
Thank you very much for your assistance.Kindly acknowledge receipt.
Yours sincerely,
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PS- I'll send more information soon

Your answers are yes ...and yes.
But don't use:
PrintWriter out=null;
Use:
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Hello all,
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After going through few posts relating to this issue, I figured out that passing application parameters would not work. Also, using IAC is not an option for me.
Can someone help? How can I hide the OKCode field and Menu bar?
Thanks and Regards,
Reena

Hello Reena,
Maintaining the parameter
~WEBTRANSACTIONTYPE EWT
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How to send Oracle rowid to servlet? | Problem with national characters.

There is same possibility how to send rowid to servlet?
I have now definition like this:
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Use something like this:
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Thanks
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Hi,
Although your workaround works.
I think this is a simple encoding problem.
I simply need to make sure all parameters and pages are encoded with a char set which contains the national characters you mentioned.
This is a bit dependent on the exact technology your using, but most can be done via the web.xml:
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You said your using a servlet so your servlet needs a similar block for its pattern
<context-param>
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Hi
I am a new member starting with Java Servlets:
I have a problem with Configuring the Servlet on the J2EE Application server.
Here is the Servlet code ...
package mypackage;
public class ShowParameters extends HttpServlet {
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N

I am trying to invoke a servlet from an HTML page.
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Rgds
N

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Hi,
I have a problem regarding servlet intercommunication.
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I m having problem while saving data.I just lose track of data entered by the user somewhere between the servlets.
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Regards
Shweta

I suggest other than showing the data on the HTML returned by Servlet_1, you created hidden values of the data submitted into the displayed form. In this way, the data would be resent to Servlet_2 when Save is pressed.
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hi guys
my problem is that, i started my tomcat server, also my servlet. this servlet should call an applet. so here are my questions:
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how looks like my codebase?
what code must i type into the servlet? something special?
do i need an apache server additional?
yes? where must be my files? :)
hope anyone can help me...
bye

keep the applet class file in the home directory, the directory in which your index.html lies, index.html -- the html which shows up when you say http://localhost:8080
and then give the applet description like this in the servlet
out.println("<applet code=\"myApplet.class\" codebase=\"http://localhost:8080\" width=\"400\" height=\"400\"> ");
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I am using RequestDispatch to pass control from one servlet to another. My problem is that when I forward the request...
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RequestDispatcher dispatcher = m_request.getRequestDispatcher(url);
dispatcher.forward(req,res);

Do you want RequestDispatcher.forward() to act like System.exit()? I.E., the thread that is called is terminated? If you want the servlet calling forward NOT to execute after the call to forward then return after the forward is complete. Remember that you are forwarding the request, not (necessarily) the thread, so execution of your method will continue unless you explicitly exit.

Jsp-servlet-bean problem

Please help!
I have a servlet controller, a javabean for the data and a jsp for the view.
I cannot get the jsp using
<jsp:useBean id="pList" class="bbs.PostListCommand" scope="request" />
to access the bean data
However, when I access the bean in this way
<%@ page import="bbs.PostListCommand" %>
// html
<% bbs.PostListCommand postList = null;
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<%     }
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� it works
Does anyone know why the <jsp:useBean> tag does not find the bean
I have installed tomcat 4.18 and set the environmental variables etc.
Directory structure is
E:\Tomcat41\webapps\examples\WEB-INF\jsp          for jsp�s
E:\Tomcat41\webapps\examples\WEB-INF\classes\bbs     for bean and servlets
Thanks in advance for any help.
Chris

GrayMan - Thanks for your help.
Let me explain my problem in more detail ...
Background:
I have some servlet experience, but I am new to jsp - so sorry if this seems trivial to you ...
I have a book called bitter java by bruce tate from manning.com . I am trying to get the chapter 3 examples to work
There are three files
PostListCommand          the bean
PostListController     the servlet
PostListResults          jsp
And a new test file � PostListResults version 2 with scriptlet code to access the bean.
There are a couple of typos in the downloaded source files, but nothing that causes the main problem of not being able to access the bean data.
Program flow
Servlet instantiates new bean
Bean � gets data from db
Servlet passes bean to jsp with a forward
Jsp outputs data
I have put the files in the directories �
E:\Tomcat41\webapps\examples\WEB-INF\jsp          for jsp�s
E:\Tomcat41\webapps\examples\WEB-INF\classes\bbs     for bean and servlets
The complete source code for each file is given below.
1 I have checked the db access � that�s ok
2 I have also checked reading the bean data back in from the request scope and printing out the results from within the servlet.- ok
3 I can access the data through a scriptlet (PostListResults version 2), but not with the original PostListResults which uses <jsp:useBean>
thanks in advance, chris
PostListController.java
package bbs;
// Imports
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
// Import for commands used by this class
import bbs.PostListCommand;
public class PostListController
extends javax.servlet.http.HttpServlet
implements Serializable {
* DoGet
* Pass get requests through to PerformTask
public void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws javax.servlet.ServletException, java.io.IOException {
performTask(request, response);
public void performTask(
HttpServletRequest request,
HttpServletResponse response) {
try {
PostListCommand postList = (bbs.PostListCommand) java.beans.Beans.instantiate(getClass().getClassLoader(),"bbs.PostListCommand");
postList.initialize();
postList.execute();
request.setAttribute("PostListCommand", postList);
ServletContext sc = this.getServletContext();
RequestDispatcher rd =
sc.getRequestDispatcher("/jsp/PostListResults.jsp");
rd.forward(request, response);
} catch (Throwable theException) {
theException.printStackTrace();
PostListCommand.java
package bbs;
import java.io.*;
import java.sql.*;
//import COM.ibm.db2.jdbc.*;
import java.util.*;
* Insert the type's description here.
* Creation date: (07/17/2001 5:07:55 PM)
* @author: Administrator
public class PostListCommand {
// Field indexes for command properties
private static final int SUBJECT_COLUMN = 1;
private static final int AUTHOR_COLUMN = 2;
private static final int BOARD_COLUMN = 3;
protected Vector author = new Vector();
protected Vector subject = new Vector();
protected Vector board = new Vector();
// SQL result set
protected ResultSet result;
protected Connection connection = null;
* execute
* This is the work horse method for the command.
* It will execute the query and get the result set.
public void execute()
throws
java.lang.Exception,
java.io.IOException {
try {
// retrieve data from the database
Statement statement = connection.createStatement();
result =
statement.executeQuery("SELECT subject, author, board from posts");
while (result.next()) {
subject.addElement(result.getString(SUBJECT_COLUMN));
author.addElement(result.getString(AUTHOR_COLUMN));
board.addElement(result.getString(BOARD_COLUMN));
result.close();
statement.close();
} catch (Throwable theException) {
theException.printStackTrace();
* getAuthor
* This method will get the author property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getAuthor(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) author.elementAt(index);
* getBoard
* This method will get the board property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getBoard(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) board.elementAt(index);
* getSubject
* This method will get the subject property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getSubject(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) subject.elementAt(index);
* initialize
* This method will connect to the database.
public void initialize()
throws java.io.IOException {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
// URL is jdbc:db2:dbname
String url = "jdbc:db2:board";
// URL is jdbc:odbc:bitter3board
String url = "jdbc:odbc:bitter3board";
// connect with default id/password
connection = DriverManager.getConnection(url);
} catch (Throwable theException) {
theException.printStackTrace();
* Insert the method's description here.
* Creation date: (07/17/2001 11:38:44 PM)
* @return int
* @exception java.lang.IndexOutOfBoundsException The exception description.
public int getSize() {
return author.size();
PostListResults.jsp
<HTML>
<HEAD>
<TITLE>Message Board Posts</TITLE>
</HEAD>
<BODY BGCOLOR=#C0C0C0>
<H1>All Messages</H1>
<P>
<jsp:useBean id="postList" class="bbs.PostListCommand" scope="request"></jsp:useBean>
<TABLE border="1">
<TR>
<TD>Subject</TD>
<TD>Author</TD>
<TD>Board</TD>
</TR>
<% for (int i=0; i < postList.getSize(); _i++) { %>
<TR> <TD><%=postList.getSubject(_i) %></TD>
<TD><%=postList.getAuthor(_i) %></TD>
<TD><%=postList.getBoard(_i) %></TD>
</TR>
<% } %>
</TABLE>
<P>
</BODY>
</HTML>
PostListResults.jsp version 2 � with scriplet code instead of useBean
<HTML>
<%@ page import="bbs.PostListCommand" %>

<HEAD>
<TITLE>Message Board Posts</TITLE>
</HEAD>
<BODY BGCOLOR=#C0C0C0>
<% bbs.PostListCommand postList = null;
synchronized(request){
     postList = (bbs.PostListCommand) request.getAttribute("PostListCommand");
     if (postList == null){ %>
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          <P>
<%     }
     else{ %>
          <TABLE border="1">
          <TR>
          <TD>Subject</TD>
          <TD>Author</TD>
          <TD>Board</TD>
          </TR>
     <% for (int i=0; i < postList.getSize(); _i++) { %>
               <TR> <TD><%=postList.getSubject(_i) %></TD>
          <TD><%=postList.getAuthor(_i) %></TD>
          <TD><%=postList.getBoard(_i) %></TD>
          </TR>
     <% } %>
          </TABLE>
<%     }
}%>
<P>
goodnight
</BODY>
</HTML>

Save servlet html output as jpeg.

Hello everybody,
I have a servlet that creates an html page.
The html consits of information from a database and displays a data sheet with images and text.
I have been asked if the outputed data sheet can be saved as an image (jpeg).
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Thanks.

I am can of confused how this works
I know that there is more to do in order to create an
image.First you have to make a desition, what do you need?
* if you only want to save a data sheet i think the better solution is a Excel format file, for this yo coul take a look at http://jakarta.apache.org/poi/hssf/index.html
* if you want to generate a pdf with images, tables, etc. yo should take a look at http://xml.apache.org/fop/
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Jorge

Servlet-html

How to send values from servlet to html..
I retrieve values from database using servlet pgm and want to display in textfield...
do reply
thx,
dish

You welcome to use my code... the syntax is not 100% for i changed table names, field names, etc for copyright purposes... but this is how i did mine
You will need to change it according to yur program/output
Create your SQL statement ...
=======================================================================================================
String q8="SELECT *     + "from search_projects "
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os.println("<BR><BR><BR>");
DisplayQuery(q8, res, "view");
========================================================================================================
static String DisplayQuery(String p_sql,HttpServletResponse res, String p_heading_types)
throws ServletException,IOException
PrintWriter os=res.getWriter();
Statement stmt = null;
String l_error = "";
try
stmt = con.createStatement();
stmt.execute(p_sql);
ResultSet rs = stmt.getResultSet();
if (rs != null)
DispResultSet(rs, res, p_heading_types);
rs.close();
return(p_sql);
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os.println(e);
return("<BR>ERROR3");
===================================================================================================
static void DispResultSet(ResultSet rs, HttpServletResponse res, String p_heading_types)
throws ServletException,IOException, SQLException
PrintWriter os=res.getWriter();
ResultSetMetaData rsmd = rs.getMetaData ();
int p=0;
int numCols = rsmd.getColumnCount ();
if (p_heading_types.equals("view"))
while (rs.next())
os.println("<TABLE BORDER=1 COLS=" + numCols + ">");
     os.println("<TR>");
     os.println("<TD>");
os.println("<TH><FONT color=blue>Id</FONT></TH>");
os.println("</TD>");
     os.println("<TD>");
os.print("<FONT color=black>"+rs.getString(1)+"</FONT></TD>");
     os.println("</TD>");
     os.println("</TR>");
     os.println("<TR>");
     os.println("<TD>");
os.println("<TH><FONT color=blue>Amount</FONT></TH>");
     os.println("</TD>");
     os.println("<TD>");
os.print("<FONT color=black>"+rs.getString(2)+"</FONT></TD>");
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     os.println("</TR>");
     os.println("<TR>");
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os.println("<TH><FONT color=blue>rings</FONT></TH>");
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os.print("<FONT color=black>"+rs.getString(3)+"</FONT></TD>");
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     os.println("</TR>");
     os.println("<TR>");
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os.println("<TH><FONT color=blue>Date</FONT></TH>");
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     os.println("<TD>");
os.print("<FONT color=black>"+rs.getString(4)+"</FONT></TD>");
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     os.println("</TR>");
     os.println("<TR>");
     os.println("<TD>");
os.println("<TH><FONT color=blue>Email</FONT></TH>");
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     os.println("<TD>");
os.print("<FONT color=black>"+rs.getString(5)+"</FONT></TD>");
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os.println("</TABLE>");
os.println("<BR><BR><BR>");
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Naren

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