JSP/Servlets & XML - suggestion needed

Hi everyone,
I don't have any coding issues, I'm really just looking for some help on deciding how to go with a project I want to make. First off, I wrote a Java library that builds messages in a special format. I wanted to come up with a pretty frontend for it, so I decided I'd try my hand at a webapp since I've been interested in them for a while. So far my web app consists of jsps, servlets and my library.
At this point I'd like to add the ability for the webapp to store created messages in an XML file (read / write). The XML library I want to use is JAXB. I have it setup to read/write my XML file fine in a test servlet, however I'd like to implement this in a kind of "best practice" approach. So I'm looking for suggestions on how I should do this.
A few of my ideas:
1) Use a jsp page to call a "MessagesBean" which retrieves my data from my xml file. I could then format this nicely in the jsp page. The problem with this however is that I can't find any way to open a file relative to the webapp from within a Bean. ie. when I try to open "messages.xml", I can see from tomcat errors that it attempts to open it in tomcats bin folder (or if i run from within eclipse, eclipses bin folder). I know I could get around this by using an absolute path but I want this to be portable. Any suggestions?
2) To solve the above problem I found "getServletContext().getRealPath("")" in the Servlet API. Using this method I'm able to open my XML file relative to my webapp. The only issue I have here is that I'm now using a servlet to display the page, making it harder for me to format the output.
I'm very new to JSP/Servlets/etc so I really don't know how I should be doing this. I'm just trying to make sure I don't start out on the wrong foot. Can someone please give some suggestions on what I could do?
Cheers.

I suggested not putting business logic in the servlet, but instead instansiating a business logic object in the servlet and calling one of its functions to do the work.
There is nothing wrong with putting the business logic in the servlet on first try. Just later on, you might want to refactor the code to more conform to the above.
In your code, you mentioned that the MessagesBean in the JSP page doesnt seem to call the constructor. The <useBean> tag first looks to
see if the object is in request scope. If it is, it uses it (doesnt call constructor). If its not, it creates its own (calls constructor). You should always
have it in request scope ready for useBean to use.
I think this line:
<jsp:useBean id="messages" class="my.package.MessagesBean" />
should be changed to something like:
<jsp:useBean id="messages" class="my.package.MessagesBean" scope="request" />
The MessagesBean should only have get/set methods to get data out of its object (its a very simple object that holds data). None of its functions
should perform business logic such as hitting the database.
Therefore these items in your JSP page should be in the servlet or business logic:
messages.setPath( getServletContext().getRealPath("") ); // Pass in relative PATH
messages.processXML(); // Process XML file
While this should be in your JSP:
java.util.List<TEXT> TextFiles = messages.getTEXTFiles(); // Return a List of TEXT objects
Question: The JSP calls my Bean "MessagesBean". It then passes in the current relative path. This seems fairly hackish to me, is there a better way to give the relative path to my bean?
Answer: Hard code the relative path to the JSP page in the servlet or business logic. There is no need for the JSP page to pass its path back to the servlet or business logic. Your servlet
'knows' the path to all the JSP pages it needs to dispatch to.
The best way to learn MVC is to continually refactor your code until it looks more and more like MVC (separation of concerns).

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Liste des campagnes here i will create the xml file the problem is to display all rows
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<%@ page import="java.io.*" %>
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int iLf = 10;
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outfile.write("</Table>"+cLf);
// Everything must be closed
rset.close();
stat.close();
conn.close();
outfile.close();
catch( Exception er ) {
%>

Please state your problem that you are having more clearly so we can help.
I looked at your code I here are a few things you might consider:
It looks like you are putting freely typed-in comments from end-users into an xml document.
The problem with this is that the user may enter characters in his text that have special meaning
to xml and will have to be escaped correctly. Some of these characters are less than character, greater than character and ampersand character.
You may also have a similiar problem displaying them on your JSP page since there may be special characters that JSP has.
You will have to read up on how to deal with these special characters (I dont remember what the rules are). I seem to recall
if you use CDATA in your xml, you dont have to deal with those characters (I may be wrong).
When you finish writing your code, test it by entering all keyboard characters to make sure they are processed, stored in the database,
and re-displayed correctly.
Also, it looks like you are putting business logic in your JSP page (creating an xml file).
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Hi Aparna,
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ragards,
Atanu
Hi all..!
I have a small problem..Plz help me..
We are developing an application in JSP, Servlets on
Linux Platform. Here, the default session time set is
30 mins. But I need to extend it by another 15 mins..
i.e., my session should be set to atleast 45 mins..
I can do it using the setMaxInactiveInterval(int
interval). which sets the amount of time that the
session will remain active between requests
before expiring and the int getMaxInactiveInterval()
, Which will return the length of time that the
session will remain active between requests before
expiring.
Through the above method,I can set the session time.
But the version of Servlets I have on my system is 2.0
JAR. and The above mentioned methods work only for
servlets version 2.1 and above..
Could U plz suggest a way where I can set the session
time for the version of servlets I have?? Plz help me
with the solution in servlet/jsp.
This is quite urgent. Plz try and help me.
Thanx and regards
Aparna

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Can any one suggest me the code for the following scenerio, Am new to jsp-Servlet....
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The sun's site provides a detailed introduction to JDBC. or
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...Just occurred to me- this hosting company is NOT using Tomcat. They use resin.
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JSP & Servlet --> Database
JSP & EJB --> Database...
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Hi all,
Now I want to use Java (JSP, Bean, Servlet and EJB)
for programming (application/web/internet/database).
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View = JSP --> for your presentation like HTML
Controller = Servlet --> as your router or dispatcher of the JSPs.
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DB...) I should use? for large business applications that would require security, optimization, etc., i suggest that you go for a good dbase and i'm referring to Oracle, SQL Server, Sybase, Informix, and the likes. But, if you're going to do simple application, MS Access can do the job. Since it comes with MS Office installation, you'll not find it any harder to configure your dbase.
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JSP Servlet JDBC connection

Below is the code for handling login.
However I am new to servlets, and I am wondering is the code below correct?
Can anyone give me some advice if it is not correct?
package gcd;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.mysql.jdbc.*;
public class LoginHandler extends HttpServlet
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
res.setContentType("text/html");
PrintWriter out = res.getWriter();
//Load the driver
Class.forName("com.mysql.jdbc.Driver");
//Get a connection to the database
java.sql.Connection connection=java.sql.DriverManager.getConnection("jdbc:mysql://localhost/gcdBB_db");
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java.sql.Statement statement = connection.createStatement();
Enumeration parameters = request.getParameterNames();
if(parameters.hasMoreElements())
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String username = req.getParameter("username");
String password = req.getParameter("password");
statement.executeUpdate("INSERT INTO users (username,password) VALUES ('"+username+"','"+password+"')");
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if (!allowUser(username, password))
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out.println("<BODY>Your login and password are invalid.<BR>");
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out.println("</BODY></HTML>");
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try
String target = (String) session.getAttribute("login.target");
if (target != null)
res.sendRedirect(target);
return;
catch (Exception ignored) { }
// Couldn't redirect to the target. Redirect to the site's home page.
res.sendRedirect("/");
protected boolean allowUser(String username, String password)
return true; // trust everyone
}

I made the following changes as suggested, to the LoginHandlaer code.
I also want to ask about the code for ProtectedResources. Do I need to inlude anything in the program. Will I need to include code for the JDBC connection?
Are the 2 java servlets below correct, as I want JSP-Servlet-JSP operation for login? I can also include the code for Login.jsp if requested?
PS: I am using Tomcat 3.1 as my server.
package gcd;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.mysql.jdbc.*;
public class LoginHandler extends HttpServlet
     public void doPost(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException
               response.setContentType("text/jsp");
          PrintWriter out = response.getWriter();
          try
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               Class.forName("com.mysql.jdbc.Driver");
                    //Get a connection to the database
                    java.sql.Connection connection=java.sql.DriverManager.getConnection("jdbc:mysql://localhost/gcdBB_db");
                    //Create a statement object
                    java.sql.Statement statement = connection.createStatement();
                    Enumeration parameters = request.getParameterNames();
                    // Get the user's username, and password
                    String username = request.getParameter("username");
                    String password = request.getParameter("password");
                    statement.executeUpdate("INSERT INTO users (username,password) VALUES ('"+username+"','"+password+"')");
               // Check the username and password for validity
               if (!allowUser(username, password))
                    out.println("<HTML><HEAD><TITLE>Access Denied</TITLE></HEAD>");
                    out.println("<BODY>Your login and password are invalid.<BR>");
                    out.println("You may want to <A HREF=\"Login.jsp\">try again</A>");
                    out.println("</BODY></HTML>");
               else
                    // Valid login. Make a note in the session object.
                    HttpSession session = request.getSession();
                    session.setAttribute("logon.isDone", username); // just a marker object
                    // Try redirecting the client to the page he first tried to access
                    try
                         String target = (String) session.getAttribute("login.target");
                         if (target != null)
                              response.sendRedirect(target);
                              return;
                    catch (Exception ignored) { }
                         // Couldn't redirect to the target. Redirect to the site's home page.
                         response.sendRedirect(request.getContextPath() + "http://localhost:8080/jsp/gcdBB");
               catch (ClassNotFoundException e)
                    out.println("Could not load database driver: " + e.getMessage());
               catch(SQLException e)
                    out.println("SQLException caught: " + e.getMessage());
     protected boolean allowUser(String username, String password)
          return true; // trust everyone
package gcd;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.mysql.jdbc.*;
public class ProtectedResources extends HttpServlet
     public void doGet(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException
          response.setContentType("text/plain");
          PrintWriter out = response.getWriter();
          // Get the session
          HttpSession session = request.getSession();
          // Does the session indicate this user already logged in?
          Object done = session.getAttribute("logon.isDone"); // marker object
          if (done == null)
               // No logon.isDone means he hasn't logged in.
               // Save the request URL as the true target and redirect to the login page.
               session.setAttribute("login.target",
               HttpUtils.getRequestURL(request).toString());
               response.sendRedirect(request.getContextPath() + "http://localhost:8080/jsp/gcdBB/Login.jsp");
               return;
          // If we get here, the user has logged in and can see the bulletin boards
          out.println("The GCD Computing Bulletin Board awaits you!");
Any help would be greatly appreciated!

Sample JSP&Servlet application required?

hey all
iam new to jsp&servlets
i did read some tutorials about the basics
and i want any link to a tutorial or a project that uses both jsp&servlets
any help?

At the risk of sounding really dumb the examples are just too complex. There does not appear to be anywhere on the web where I can find a simple JSP/servlet/bean example of the type I described. There is enouigh material describing each individual component, but what I need is an example to cement the ideas, but the ones suggested are too much for a newbie. Even the much vaunted Pet Store thingy causes my eyes to glaze over.
I dont expect anyone to have written something with my exact requirements, but surely to goodness there must be something that:
1. On entry presents a search form on a table (e.g. EMP)
2. On submission list all rows in EMp matchiung the criteria.
3. The user can either click the link 'Edit' which opens up a form dispalying the row allowing the user to edit and save the changes, or click the 'New' button to show a blank form to create a new EMP.
All this via a Controller servlet, with the database logic handled by a java bean, and all the presentation done via JSP.
To me this is the most obvious and instructive example of this technology, but after days of trawling the web, and looking through a number of books, I cannot find such a thing.
CGI with Perl DBI/DBD was a breeze to work with compared to this stuff ..... maybe ASP with SQL/Server would be a more fruitful use of time.

How can i display data on tha same page in jsp/servlet

Hello friend,
I am storing 50 items in a dataBase. i ve two buttons/links name previous and next. i ve to display 10 items each time in the same page when i click next button and the revrese for previous. through JSP/Servlet.
Any suggestions will be appreciated.
chintan anand

I'm not sure this is the best practice... try to add the item in the arraylist, then when u click next button, add 10 to the counter. subtract if it is a previous button. thats it!
ex..
for(int x=counter;x<=arraylist.lenght();x++)
....print item here......
}

Using JSP/Servlet to write Word Document to BLOB

Hi
I need some help pls
When I use a normal class with a main method, it loads the word document into a blob and I can read this 100%.Stunning.
With a JSP/Servlet I cannot get the document out again. The "format" seems to be lost.
Any ideas,help greatly appreciated:
Here is the Main class that works:
package mypackage1;
import java.io.OutputStream;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.Writer;
import java.sql.Connection;
import oracle.jdbc.*;
import oracle.jdbc.OracleResultSet;
import oracle.sql.BLOB;
import org.apache.log4j.Logger;
import Util_Connect.DataBase;
public class TestLOB
//static final Logger logger = Logger.getLogger("test");
public TestLOB()
public static void main(String args[])
TestLOB testLOB = new TestLOB();
testLOB.TestLOBInsert("c:\\my_data\\callcenterpilot.doc");
public void TestLOBInsert(String fileName)
Connection conn = getConnection("wizard");
BLOB blob = null;
try
conn.setAutoCommit(false);
String cmd = "SELECT * FROM so_cs.testlob WHERE docno = 1 FOR UPDATE";
PreparedStatement pstmt = conn.prepareStatement(cmd);
ResultSet rset = pstmt.executeQuery(cmd);
rset.next();
blob = ((OracleResultSet)rset).getBLOB(2);
File binaryFile = new File(fileName);
System.out.println("Document length = " + binaryFile.length());
FileInputStream instream = new FileInputStream(binaryFile);
OutputStream outstream = blob.getBinaryOutputStream();
int size = blob.getBufferSize();
byte[] buffer = new byte[size];
int length = -1;
while ((length = instream.read(buffer)) != -1)
outstream.write(buffer, 0, length);
instream.close();
outstream.close();
conn.commit();
closeConnection(conn);
catch (Exception ex)
System.out.println("Error =- > "+ex.toString());
private Connection getConnection(String dataBase)
Connection conn = null;
try
DriverManager.registerDriver(new OracleDriver());
conn = DriverManager.getConnection("jdbc:oracle:thin:@oraclu5:1600:dwz110","so_cs","so_cs");
catch (Exception ex)
System.out.println("Error getting conn"+ex.toString());
return conn;
private void closeConnection(Connection conn)
if (conn != null)
try
conn.close();
catch (Exception se)
System.out.println("Error closing connection in get last imei"+se.toString());
Works fine:
Here is the display servlet: Works when main class inserts file
package mypackage1;
import java.io.InputStream;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.Writer;
import java.sql.Connection;
import oracle.jdbc.*;
import oracle.jdbc.OracleResultSet;
import oracle.sql.BLOB;
import org.apache.log4j.Logger;
import Util_Connect.DataBase;
public class DisplayLOB extends HttpServlet
private static final String CONTENT_TYPE = "text/html; charset=windows-1252";
static final Logger logger = Logger.getLogger(DisplayLOB.class);
public void init(ServletConfig config) throws ServletException
super.init(config);
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
//response.setContentType(CONTENT_TYPE);
//PrintWriter out = response.getWriter();
Connection conn = null;
PreparedStatement pstmt = null;
try
conn = getConnection("wizard");
//out.println("<html>");
//out.println("<head><title>DisplayLOB</title></head>");
//out.println("<body>");
//out.println("<p>The servlet has received a POST. This is the reply.</p>");
InputStream is=null;
oracle.sql.BLOB blob=null;
response.setContentType("application/msword");
//response.setContentType("audio/mpeg");
OutputStream os = response.getOutputStream();
String term = "1";
String query = "SELECT docdetail FROM testlob WHERE docno = 1";
pstmt = conn.prepareStatement(query);
ResultSet rs = pstmt.executeQuery();
while (rs.next())
blob=((OracleResultSet)rs).getBLOB(1);
is=blob.getBinaryStream();
int pos=0;
int length=0;
byte[] b = new byte[blob.getChunkSize()];
while((length=is.read(b))!= -1)
pos+=length;
os.write(b);
}//try
catch (Exception se)
se.printStackTrace();
finally
try
pstmt.close();
catch (Exception ex)
System.out.println("Error closing pstmt "+ex.toString());
//out.println("</body></html>");
//out.close();
private Connection getConnection(String dataBase)
Connection conn = null;
try
conn = DataBase.getPoolConnection(dataBase);
catch (Exception se)
logger.fatal("Error getting connection: ",se);
return conn;
private void closeConnection(Connection conn)
if (conn != null)
try
conn.close();
catch (Exception se)
logger.error("Error closing connection in get last imei",se);
Here is JSP/Servlet
<%@ page import="org.apache.log4j.*"%>
<%@ page contentType="text/html; charset=ISO-8859-1" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>untitled</title>
<title>Wizard SMS Interface</title>
<link rel='stylesheet' type='text/css' href='main1.css'>
<script language='JavaScript' src='copyright.js'></script>
</head>
<pre>
<%
//HTTP 1.1
response.setHeader("Cache-Control","no-cache");
//HTTP 1.0
response.setHeader("Pragma","no-cache");
//prevents caching at the proxy server
response.setDateHeader ("Expires", 0);
Logger logger = Logger.getLogger("co.za.mtn.wizard.administration.admin01.jsp");
%>
</pre>
<body>
<FORM ACTION="/WizardAdministration/uploadfile"
METHOD="POST"
ENCTYPE="multipart/form-data">
<INPUT TYPE="FILE" NAME="example">
<INPUT TYPE="SUBMIT" NAME="button" VALUE="Upload">
</FORM>
</body>
</html>
<font> <b>Copyright ©
<script>
var LMDate = new Date( document.lastModified );
year = LMDate.getYear();
document.write(display(year));
</script>
Mobile Telephone Networks.
<p align="left"><i><b><font face="Georgia, Times New Roman, Times, serif" size="1"></font></b></i></p>
package co.za.mtn.wizard.admin;
import java.io.InputStream;
import java.util.Enumeration;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.FileNotFoundException;
import java.io.Writer;
import java.sql.Connection;
import oracle.jdbc.OracleResultSet;
import oracle.sql.BLOB;
import org.apache.log4j.Logger;
import Util_Connect.DataBase;
public class UploadFile extends HttpServlet
private static final String CONTENT_TYPE = "text/html; charset=windows-1252";
//static final Logger logger = Logger.getLogger(UploadFile.class);
public void init(ServletConfig config) throws ServletException
super.init(config);
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
String headerName = null;
Enumeration en = request.getHeaderNames();
try
while ( en.hasMoreElements() )
Object ob = en.nextElement();
headerName = ob.toString();
System.out.println("Value for headerNAme is >"+headerName+"<");
String aaa = request.getHeader(headerName);
System.out.println("Value for aa is >"+aaa+"<");
catch (Exception ex)
System.out.println("Error in extracting request headers"+ex.toString());
Connection conn = getConnection("wizard");
BLOB blob = null;
try
conn.setAutoCommit(false);
String cmd = "SELECT * FROM so_cs.testlob WHERE docno = 1 FOR UPDATE";
PreparedStatement pstmt = conn.prepareStatement(cmd);
ResultSet rset = pstmt.executeQuery(cmd);
rset.next();
blob = ((OracleResultSet)rset).getBLOB(2);
//File binaryFile = new File("h:\\callcenterpilot.doc");
//System.out.println("Document length = " + binaryFile.length());
//FileInputStream instream = new FileInputStream(binaryFile);
response.setHeader("Content-Type","application/vnd.ms-word");
String contentType = request.getContentType();
System.out.println("Content type received in servlet is >"+contentType+"<");
ServletInputStream instream = request.getInputStream();
OutputStream outstream = blob.getBinaryOutputStream();
int size = blob.getBufferSize();
byte[] buffer = new byte[size];
int length = -1;
while ((length = instream.read(buffer)) != -1)
outstream.write(buffer, 0, length);
instream.close();
outstream.close();
conn.commit();
closeConnection(conn);
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
catch (Exception ex)
System.out.println("Error =- > "+ex.toString());
//out.println("</body></html>");
//out.close();
private Connection getConnection(String dataBase)
Connection conn = null;
try
conn = DataBase.getPoolConnection(dataBase);
catch (Exception se)
System.err.println("Error getting connection: "+se.toString());
return conn;
private void closeConnection(Connection conn)
if (conn != null)
try
conn.close();
catch (Exception se)
System.err.println("Error closing connection in get last imei"+se.toString());
This is what the display servlet is showing when the JSP/Servlet insert the document
-----------------------------7d31422224030e
Content-Disposition: form-data; name="example"; filename="H:\(your name) Skills Matrix.doc"
Content-Type: application/msword
�� ࡱ � > ��
Tks
Andre

hello,
there are multiple documents out there, describing the oracle reports server setup. try doc.oracle.com for documentation.
also it is part of the online-documentation.
you need to install 9iAS enterprise edition. the server is pre-configured and will listen to the url http://yourserver/dev60cgi/rwcgi60.exe
passing only this url you will get a help-screen, describing the syntax.
regards,
the oracle reports team

JSP/Servlets & XML - suggestion needed

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