Regarding logout page in jsp and servlets
Hi Friends,
I have created a web page for employee details. When employee enters his details that will be stored in database. Now the problem arises with logout page. When user presses logout, the page is redirected to login page. When he presses back button again its getting logging in for the employee who has just logged in. Can anyone guide me how to resolve this problem. When he presses on back button the page should display with warning message that session has expired. Click here to login. I am posting the code what I have done. And if anyone try to solve using servlets and jsp also no issues. I would be grateful if anyone helps me in advance.
IDE: Netbeans
Database: MS-Access.
Code is as follows
This is html page for employee details:(EmployeeDetails.jsp)
<html>
<head>
<script language=javascript>
function Value()
FirstName=document.form1.FirstName.value;
MiddleName=document.form1.MiddleName.value;
LastName=document.form1.LastName.value;
EmployeeID=document.form1.ID.value;
day=document.form1.select1.value;
month=document.form1.select2.value;
year=document.form1.select3.value;
EmailID=document.form1.EmailID.value;
if(FirstName=="")
alert("Enter The FirstName");
document.form1.FirstName.focus();
document.form1.FirstName.select();
return true;
else if(LastName=="")
alert("Enter The LastName");
document.form1.LastName.focus();
document.form1.LastName.select();
return false;
else if(EmployeeID=="")
alert("Enter EmployeeID");
document.form1.ID.focus();
document.form1.ID.select();
return false;
else if(isNaN(EmployeeID))
alert("Enter The EmployeeID in Numbers");
document.form1.ID.focus();
document.form1.ID.select();
return false;
else if(day=="Day")
alert("Select The Day");
document.form1.select1.focus();
return false;
else if(month=="Month")
alert("Select The Month");
document.form1.select2.focus();
return false;
else if(year=="Year")
alert("Select The Year");
document.form1.select3.focus();
return false;
else if(EmailID=="")
alert("Enter EmailID");
document.form1.EmailID.focus();
document.form1.EmailID.select();
return false;
</script>
</head>
<body BGCOLOR="#ffffcc">
<form name=form1 action="val.jsp" method="post" >
<font color="#FF0000">*</font> <i><b>First Name : </b></i>
<input type="text" name="FirstName" >
logout
<br>
* <i><b>Middle Name:</b></i>
<input type="text" name="MiddleName" size="20"><br>
<font color="#FF0000">* </font><i><b>Last Name : </b></i>
<input type="text" name="LastName" size="20"><br>
<font color="#FF0000">*</font> <i><b>EmployeeID: </b></i>
<input type="text" name="ID" size="20" maxlength="5"><br>
(DD) / (MM) / (Yr)<br>
<font color="#FF0000">*</font> <i><b>D.O.J: </b></i>
<select name="select1"> <option value="Day" selected>Day</option>
<script language=javascript>
for(i=01;i<=31;i++)
document.write("<option value="+i+">"+i+"</option>");
</script>
</select> /
<select name="select2">
<option value=Month selected>Month</option>
<script language=javascript>
for(i=01;i<=12;i++)
document.write("<option value="+i+">"+i+"</option>");
</script>
</select> /
<select name="select3">
<option value=Year selected>Year</option>
<script language=javascript>
for(i=1975;i<=2009;i++)
document.write("<option value="+i+">"+i+"</option>");
</script>
</select>
<br>
<font color="#FF0000">*</font> <i><b>EmailID: </b></i>
<input type="text" name="EmailID" ><br>
<font color="#FF0000">* </font><i><b>Star with red mark
indicates Mandatory </b></i>
<i> <b>Star with black mark indicates Optional</b></i><br>
<input type="submit" value="Submit" name="Submit" onclick="Value()">
</form>
</body>
</html>
This is for validation purpose(i.e inserting data into database)
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page language="java" import ="java.sql.*" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%
Statement stmt=null;
ResultSet rs=null;
Connection con=null;
String firstname,lastname,empid,day,month,year,emailid,doj;
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con= DriverManager.getConnection("jdbc:odbc:login");
System.out.println("Database Connected");
// System.out.println("name : " +request.getParameter("name"));
firstname=request.getParameter("FirstName");
lastname=request.getParameter("LastName");
empid=request.getParameter("ID");
day=request.getParameter("select1");
month=request.getParameter("select2");
year=request.getParameter("select3");
doj= year + month + day;
emailid=request.getParameter("EmailID");
stmt=con.createStatement();
String query = "insert into EmployeeTable values ('"+firstname+"','"+lastname+"',"+empid+",'"+doj+"','"+emailid+"')";
int i =stmt.executeUpdate(query);
if(i==1)
out.println("Data inserted Successfully");
else
out.println("Data insertion failed ");
catch(ClassNotFoundException ce)
out.print(ce);
catch(Exception se)
out.print(se);
%>
</body>
</html>
This is code for logout page (logout.jsp)
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%
session.invalidate();
session=request.getSession(true);
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires",0);
response.sendRedirect("Login.jsp");
%>
</body>
</html>
Another way for logout page what I have tried
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%
request.getSession();
session.invalidate();
%>
<jsp:forward page="Login.jsp"/>
</body>
</html>
With Regards,
V.S.Ravi Kiran Balusu.
Hi Friends,
Once again i am posting the code here also....can check it out...
login.jsp
<title>Logout Sample JSP 1</title>
<%
String error = (String) request.getAttribute("Error");
if (error != null) {
out.write("<center><strong>");
out.write("<font color=\"Red\">");
out.write(error);
out.write("</font>");
out.write("</strong></center>");
%>
<form action="loginAction.jsp" focus="userName" method="POST">
<table class="tborder" width="50%" cellspacing="1" cellpadding="3" align="center">
<tr>
<td colspan="2">Please login with a valid user name and password</td>
</tr>
<tr>
<td><font color="Red">*</font>User Name: </td>
<td>
<input id="userName" name="userName" type="text" size="20" value=""></input>
</td>
</tr>
<tr>
<td><font color="Red">*</font>Password: </td>
<td>
<input id="password" name="password" type="password" size="20" value=""></input>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" id="submit" name="submit" value="Logon"></input>
</td>
</tr>
</table>
</form>
loginAction.jsp
<%@ page import="java.sql.*" %>
<%
String userName = request.getParameter("userName");
String password = request.getParameter("password");
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
RequestDispatcher rd = request.getRequestDispatcher("home.jsp"); //forward to home page by default
try {
//Change the next 3 lines to use correct values in your own environment
String dbURL = "jdbc:mysql://localhost/logoutSamplesdb";
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection(dbURL, "root", "qut854");
stmt = con.createStatement();
rs = stmt.executeQuery("select password from USER where userName = '" + userName + "'");
if (rs.next()) { //query only returns 1 record in the result set
if (rs.getString("password").equals(password)) { //if valid password
session.setAttribute("User", userName); //Saves user name string in the session object
else { //password does not match,i.e. invalid user password
request.setAttribute("Error", "Invalid password.");
rd = request.getRequestDispatcher("login.jsp");
} //no record in the result set,i.e. invalid user name
else {
request.setAttribute("Error", "Invalid user name.");
rd = request.getRequestDispatcher("login.jsp");
catch (Exception e) { //database problem
request.setAttribute("Error", "Problem accessing security realm.");
rd = request.getRequestDispatcher("login.jsp");
e.printStackTrace();
finally {
try {
stmt.close();
con.close();
catch (Exception ignore) {
rd.forward(request, response);
%>
for home.jsp
<title>Logout Sample JSP 1</title><%String userName = (String) session.getAttribute("User");
if (null == userName) {
request.setAttribute("Error", "Session has ended. Please login.");
RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
rd.forward(request, response);
%>
Logout
<p>
This is home page. This page is pretended to contain secure information.
</p>
logout.jsp
<title>Logout Sample JSP 1</title><%String userName = (String) session.getAttribute("User");
if (null == userName) {
request.setAttribute("Error", "Session has ended. Please login.");
RequestDispatcher rd = request.getRequestDispatcher("login.jsp");
rd.forward(request, response);
%>
<form action="logoutAction.jsp">
<table class="tborder" width="50%" cellspacing="1" cellpadding="3" align="center">
<tr>
<td colspan="2"> Are you sure you would like to logout?</td>
</tr>
<tr>
<td>
<input type="submit" id="submit" name="submit" value="OK"></input>
</td>
<td>
<input type="submit" id="submit" name="submit" value="Cancel"></input>
</td>
</tr>
</table>
</form>
With Regards,
V.S.Ravi Kiran Balusu.
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Server documentation on deploying such files.
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We HAD to change this file in order for ThirdParty.jar file to pick up the native C++ code using JNI. Apparently, the
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Change Extrapath directive:
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http://yourserver/foo/foo.jsp
Hope this was helpful!!!
SonuDeploying a WAR file containing .jsp and servlets (also uses JNI) on Windows 2000
We had problems making it initially work on Sun ONE Web Server 6.0 Service Pack 1 because of lack of good iPlanet Web
Server documentation on deploying such files.
This is how we went about it:
1) Make one of the servlet and JSP (must call another Java Class) web application (.war) examples work with iPlanet Web
Server.
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\HelloWorld\HelloWorld.war
and
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service packs)
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Click on Select a Server:Manage
Click on Virtual Server Class
Click on https-yourserver
Click on the Web Applications Tab
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Enter the following -
WAR File On: Local
WAR File Path: C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Application URI: /jakarta
Installation Directory: c:\iPlanet\examples\jakarta-examples
By clicking on OK it deployed the application.
I can verify that it is deployed by selecting "Edit Web Applications" and I see the following entry:
Edit /jakarta c:/iPlanet/examples/jakarta-examples
Also, c:/iPlanet/examples/jakarta-examples should have the similar following directory structure ..
- [images]
- [jsp]
- index.html
- [servlets]
- [META-INF]
- [WEB-INF]
- [classes]
- [tlds]
- web.xml
- index.html
I restarted the server and accessed it using the following URL from my IE browser:
http://yourserver/jakarta/index.html
Then I clicked on the JSP Examples and tried some JSP examples.
b) Alternatively, you can also deploy the same example from the command-line.
Make sure C:\iPlanet\Servers\bin\https\httpadmin\bin\ is in your path
wdeploy deploy -u /jakarta
-i yourserver
-v https-yourserver
-d c:\iplanet\examples\jakarta-examples
C:\iPlanet\Servers\plugins\servlets\examples\web-apps\jakarta-examples\jarkarta-examples.war
Restart the web server (I don't think you have to restart, but .. might as well).
2)Deploy your web-application
My Foo.war has the following structure.
You can use jar tf Foo.war to look at the file contents from command line (assuming you have JDK installed and the bin is
in your PATH)
Foo.war
- [META-INF]
- [WEB-INF]
- web.xml
- [classes]
- Bar.class
- MoServlet.class
- [lib]
- ThirdParty.jar
- [natlib]
- extlib.dll
- foo.jsp
Here is our application scenario:
foo.jsp uses a class call Bar (it is not in any package). The Bar java class uses classes from ThirdParty.jar. The
ThirdParty.jar in turn uses JNI to load library extlib.dll. foo.jsp also calls /servlet/Mo as well.
Now to deploy it, do the following:
(a) Make sure that within foo.jsp, you import the Bar class ( I don't know why you have to do it, but if you don't you get
JSP compile error).
<%@page language="java" import="Bar" contentType="text/html"%>
(b) Check web.xml (for Servlets)
Within web.xml, make sure you have the following mappings:
<servlet>
<servlet-name> MoLink </servlet-name>
<servlet-class> MoServlet </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> MoLink </servlet-name>
<url-pattern> /servlet/Mo </url-pattern>
</servlet-mapping>
(c) Deploy the application
Using command line:
wdeploy deploy -u /foo
-i yourserver
-v https-yourserver
-d c:\iplanet\examples\foo-dir
Foo.war
(d) Change web-apps.xml file (for picking up ThirdParty.jar)
It is located in
C:\iPlanet\Servers\https-yourserver\config
You should see something similar to following after successful deployment.
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true"/>
Change it to look like following to pick up the ThirdParty.jar
<web-app uri="/foo" dir="C:\iPlanet\examples\foo-dir" enable="true">
<class-loader reload-interval="300"
classpath="C:/iPlanet/examples/foo-dir/WEB-INF/lib/ThirdParty.jar"
delegate="false"/>
</web-app>
(e) Change jvm12.conf file (for JNI)
It is located in
C:\iPlanet\Servers\https-yourserver\config
Add or uncomment the following lines:
#optional - just helps with instrumenting the jsp and servlet code
jvm.include.CLASSPATH=1
jvm.enableDebug=1
nes.jsp.enabledebug=1
jvm.trace=7
jvm.verboseMode=1
#required for JNI
java.compiler=NONE
jvm.classpath=.;C:\JDK1.3.1\lib\tools.jar;C:/iPlanet/Servers/plugins/servlets/examples/legacy/beans.10/SDKBeans10.jar;
jvm.option=-Xrs
jvm.option=-Xnoagent
# not sure if this is needed for iPlanet web server
jvm.option=-Djava.library.path=C:/iPlanet/examples/foo-dir/natlib/ -Djava.compiler=NONE
(f) Change magnus.conf file (for JNI)
We HAD to change this file in order for ThirdParty.jar file to pick up the native C++ code using JNI. Apparently, the
iPlanet Web Server doesn't pick the Environment Variable Path. Because when we had the directory containing the DLL just
in Path, it didn't work.
Change Extrapath directive:
ExtraPath C:/iPlanet/Servers/bin/https/bin;${NSES_JRE_RUNTIME_LIBPATH}
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(g) Apply changes from the Web Server Administration Console and Restart the web server.
You should be able to see the behaviour that you want from your application.
http://yourserver/foo/foo.jsp
Hope this was helpful!!!
Sonu -
Hi friends,
[please forgive me if i am posting this in the wrong forum, all seems same to a fresher]
Now, to my problem..i need a suggestion, a way or a method to implement the following!
I am supposed to create a servlet that reads data from oracle database. Once i retrive the data (for example: 6 rows of a table having 4 attributes), i am supposed to pass this data to a JSP page where the data has to be formatted and displayed properly. If i call the same servlet from a different JSP, i should be able to access the data in that JSP and format it in a different way. How do i pass the data to JSP? what method i can use to achieve this task?
Note: I already know about PrintWriter pw = response.getWriter(); and then printing the formated HTML page..but i want to keep the formatting to JSP part and send only the data part that i can access in JSP
Thanks in adavancearun_ramachandran wrote:
[please forgive me if i am posting this in the wrong forum, all seems same to a fresher]Then you should learn to be more observant - after all, we have JSP and Servlet fora, further down the list. :)
I am supposed to create a servlet that reads data from oracle database. Once i retrive the data (for example: 6 rows of a table having 4 attributes), i am supposed to pass this data to a JSP page where the data has to be formatted and displayed properly. If i call the same servlet from a different JSP, i should be able to access the data in that JSP and format it in a different way. How do i pass the data to JSP? what method i can use to achieve this task? You can store the data in your session object. You can even use JavaBeans and the jsp:usebean tag.
[http://java.sun.com/products/jsp/tags/11/syntaxref11.fm14.html]
Note: I already know about PrintWriter pw = response.getWriter(); and then printing the formated HTML page..but i want to keep the formatting to JSP part and send only the data part that i can access in JSPA wise approach - I wish more prople woiuld be as thoughtful. -
Implement SSL in JSP and servlets
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manihi,
soory for late reply.
i think you need to use keytool program in your JDK to generate a certificate signature file and you need to configure the server.xml to open and use the HTTPS port. I have not had any additional info on this but i would assume that you simply enter https:// on the file you wish to load in your form and it should use the HTTPS port provided it can find the certificate which must be stored somewhere in your tomcat web server. i would recommend you see tomcat website or search on google for "ssl support in tomcat".i hav not had time to look into this but i will as soon as i am free from my work load.
mani -
How to setup my computer to run JSP and Servlets
I want to setup my computer to run JSP and Servlets.
What kind of Servers and other tool i need to install to run JSP and Servlets.
Plz, Help me to start my work on JSP.
Regards,
Usman Alihello
JSP and servlet is web programming, may be little bit different to development local application.
1st, you should have two computers: one is server and the other is local workstation. This server should have a static IP address, that other people can go into your server. Workstation is any computer normal you use it.
2nd, you need to setup your server in: OS(linux or windows 2000), web server (jrun, apach or Tomcat etc. ), as well as install JDK, servlet.
3rd, your local workstation just use as programming editor and open a browser to testing, anytime you write your code, then ftp to server to test.
Reality, you have many technical thing to solve, eg setup web server etc. However, you can write your source code and test it, then open to outside people.
hope to helpness, if anything don't uderstand, you can post again or send email to me [email protected] Since I just have setup this configuration in my university for my project. -
Basic jsp and servlet question (JSP Model 2)
Hi
I want to make an website where i use JSP Model 2 architecture. However I got a basic question
1. I need to separate business logic from presentation with the use of jsp and servlets. Meaning I want no html code in the servlet. Can you give a simple example of how this can be done? If I map my implementation of httpServlet to a jsp page in web.xml and override doPost() and doGet(). The calls to the jsp page comes to the servlet as it should. I want to process some methods (calling sessionbeans or similar which in turn calls entitybeans) and then show the jsp page.
How do I show the jsp page without mixing html in the servlet as I've done below:
doGet(HttpServletRequest req, HttpServletResponse res)
PrintWriter p = response.getWriter();
p.print("<html><body>Hello world</body></html>"); //I dont want to do //this, I want to display the JSP site
doPost(HttpServletRequest req, HttpServletResponse res)
//doSomething
}Message was edited by:
CbbLeYou should treat your servlet class much like a controller, where you can then use JSP as the view. The way you achieve this is to use the forward() method in RequestDispatcher.
Say you've got a servlet class org.yoursite.controller.YourController:
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//Set some value for use in the JSP file associated wth me
req.setAttribute("greeting", "Hello world!");
//Done with our business logic, off we go to the JSP file
ServletContext app = getServletContext();
RequestDispatcher disp;
disp = app.getRequestDispatcher("/some/jsp/file.jsp);
disp.forward(req, resp);
}Now in your JSP file:
<h1>Example</h1>
<div>
I just want to say <%= request.getAttribute("greeting") %>
</div>Going to that servlet now executes business logic and then points to the JSP file for the view. You can forward from servlet to servlet too if needs be. The string you pass to forward() is whatever would be in the URI of the request so any <servlet-mapping> configurations in web.xml are used ;)
There is some pretty in-depth documentation on the J2EE blueprints website, namely service-to-worker and front-controller patterns. I dare say if you're looking for this sort of code you'll want to look at the composite view pattern too (also on blueprints). -
Am I correct in assuming that JSP is an extention of servlets and that to learn JSP in effect means learning about servlets? My point is, is JSP the superior technology a bit like learning JDK1.4 is now a pointless excercise as it has been superceded by 1.5 ?
thanksAm I correct in assuming that JSP is an extention of
servletsYes.
and that to learn JSP in effect means
learning about servlets? No. This isn't necessary, as a matter of fact, it is one of the reasons why JSP exists - so people with little or no Java knowledge can build dynamic web sites using Servlet containers, assuming they have Java programmers behind them to build the tags / glue to the web app.
Still, I say having basic understanding of Servlets (at least) will help you out.
My point is, is JSP the
superior technology No. JSP has a different role. It makes display easier to code for non-Java programmers (looks more like HTML/XML), and easier to support and understand later on.
JSP does horribly bad at complex application control, data selection and manipulation, or as an interface to external resources. Java and Servlets are better at these tasks (but conversly, are horrible to work with for display purposes).
They are different, JSPs and Servlets, in what task they do. J2EE is far superior when you use them both appropriately.
a bit like learning JDK1.4 is now
a pointless excercise as it has been superceded by
1.5 ?No.
JSP is a newer technology, but should not be used to replace Servlets, but used along side Servlets to provide a better designed and manageable application.
Let the servlets control what pages the user sees when, to gather data, to talk with external resources. Then forward to a JSP which simply displays what the Servlet did all the work in getting.
>
thanks -
SQLJ JSP and SERVLETS which Environment?
Hello,
I am attempting to run the samples on Chapter 5 of the
following documents with partial success.
http://technet.oracle.com/docs/products/oracle8i/doc_library/817_
doc/java.817/a83726/oraext2.htm
http://download-west.oracle.com/otndoc/oracle9i/901_doc/java.901/
a90208/oraext.htm#1015820
1. Do I need the Apache+Jserv environment to run SQLJ and JSP?
2. What do I need to do run SQLJ on oc4j if possible?
3. I dont know how to load(?) and/or run this .sqljsp file.
<%@ page language="sqlj"
import="sqlj.runtime.ref.DefaultContext,oracle.sqlj.runtime.Oracl
e" %>
<HTML>
<HEAD> <TITLE> The SQLJQuery JSP </TITLE> </HEAD>
<BODY BGCOLOR="white">
<% String empno = request.getParameter("empno");
if (empno != null) { %>
<H3> Employee # <%=empno %> Details: </H3>
<%= runQuery(empno) %>
<HR><BR>
<% } %>
<B>Enter an employee number:</B>
<FORM METHOD="get">
<INPUT TYPE="text" NAME="empno" SIZE=10>
<INPUT TYPE="submit" VALUE="Ask Oracle");
</FORM>
</BODY>
</HTML>
<%!
private String runQuery(String empno) throws
java.sql.SQLException {
DefaultContext dctx = null;
String ename = null; double sal = 0.0; String hireDate = null;
StringBuffer sb = new StringBuffer();
try {
dctx = Oracle.getConnection("jdbc:oracle:oci8:@", "scott",
"tiger");
#sql [dctx] {
select ename, sal, TO_CHAR(hiredate,'DD-MON-YYYY')
INTO :ename, :sal, :hireDate
FROM scott.emp WHERE UPPER(empno) = UPPER(:empno)
sb.append("<BLOCKQUOTE><BIG><B><PRE>\n");
sb.append("Name : " + ename + "\n");
sb.append("Salary : " + sal + "\n");
sb.append("Date hired : " + hireDate);
sb.append("</PRE></B></BIG></BLOCKQUOTE>");
} catch (java.sql.SQLException e) {
sb.append("<P> SQL error: <PRE> " + e + " </PRE> </P>\n");
} finally {
if (dctx!= null) dctx.close();
return sb.toString();
%>
I named above file as test2.sqljsp then I tried these procedures:
a) $ ojspc test2.sqljsp --these created all the files
b) $ loadjava -u -v scott/tiger _test2.class -resolve
this generated:
initialization complete
loading : _test2
creating : _test2
resolver :
resolving: _test2
errors : _test2
ORA-29521: referenced name test2$_jsp_StaticText could not
be found
ORA-29521: referenced name test2SJProfileKeys could not be
found loadjava: 2 errors
c) listed the directory and both these files are there but it
cannot resolve or find it?
d) I recall reading something about publishjsp command but I have
to establish a session shell with OSE? this part is very
confusing and am not sure what to do here.
e) not sure if i need to publish the loaded class (create a
procedure? so it can be known to the rest of plsql?)
A step by step procedure is very much appreciated. fyi.. I
have Oracle 8.1.7, + oc4j, I can run sqlj from command line
and class files generated I can run. I can also run JSP and
servlets on the oc4j accessing the database. It is this SQLJ
that throws me off balance. If you include Jdeveloper steps
ro run SQLJ thats also welcome.
Thanks in advance for kind responses posted.In many Model-View-Controller web applications implemented using J2EE, servlets are as controllers to direct the flow between the model and view. While servlets can output HTML code directly, it is much better to use JSPs for the most part. JSPs contain HTML and possibly Java scriptlets. The J2EE container will typically compile JSPs into servlets. While you could use a JSP as a controller, there are drawbacks to that approach. To minimize the amount of Java code in your JSPs, you can either use the tags provided by the JSP spec or use tag libraries written by someone else or yourself. See the JSTL for one such example.
Also see:
http://wiki.java.net/bin/preview/Javapedia/MVC
http://wiki.java.net/bin/view/Javapedia/JavaServerPages -
How to track the same session using both jsp and servlets
Hello, guys:
"how to use jsp and servlet to track the same session",
it seems to me my logoff.jsp never realize the session I established in my servlets.
Here is how I set my session in my servlets:
" HttpSession session = req.getSession(true);
session.setAttribute("userid",suserid);"
Here is how I invalidate my session in my logoff.jsp
" <%@ page language= "java" %>
<%@ page import="javax.servlet.http.HttpSession" %>
<%@ page session="false"%>
Our Session id is : <%= session.getId() %>
<% session.removeAttribute("userid");
session.invalidate();
%>
Our Session id is : <%= session.getId() %>"
but when I try to logoff using the logoff.jsp
I always get following error message.
"/home/jiao/jsp_webserver/tomcat/work/Standalone/localhost/syllabus/htmls/logoff_jsp.java:50: cannot resolve symbol
symbol : variable session
location: class org.apache.jsp.logoff_jsp
out.print( session.getId() );"
T.I.A.
[Edited by: jiveadmin on Jun 18, 2003 10:32 AM]
[Edited by: jiveadmin on Jun 18, 2003 10:33 AM]So,
<%@ page session="false"%>
That means the jsp never instantiates the build in session object.
<%@ page session="true"%>
means jsp will instantiates a session object if there are no existing ones
how about I just delete the line,
does that mean the jsp will find the existing session object for me?
So I can do something like
Our Session id is : <%= session.getId() %>
<% session.removeAttribute("userid");
session.invalidate();
%>
directly.
T.I.A. -
Interesting single sigon application project using jsp and servlet....Help.
A customer login's to my website using Enterprise login. I am supposed to have a link on my website to this other website(that also uses our Enterprise login details but hosted by other vendor/company on their server), and when I click this link the customes should automatically get logged in to this other website and get a welcome page(instead of login page).
Below are the sequence of steps that the other website wants me to perform to get to his welcome page(i.e bypass his login page).
FYI, I am planning to build a jsp page with a link to this other website. Can some body tell me how should I build the application(i.e) how jsp and servlets be build to interact to perform these operations. Any hep is greatly appreciated.
1.When a user clicks on to other website link(available on my website), the browser generates an HTTP GET request to the Other website's session servlet. User's name is one of the parameters of this request.
2.Other website receives the HTTP request and generates a unique session identifier for this user. An HTTP response to the end-user is then sent. The user's name and the session identifier are passed back as parameters in the redirect URL.
3.The browser sends the HTTP request (GET) to the Verification Service that was specified in the redirect message. The parameters (user name and/or session id) will be passed as URL parameters.
4.The Verification Service(of other website) authenticates the user. A redirect URL to it's sigon servlet(with parameter's User id and key) is then sent back to the user's browser.
5.The end-user's browser will perform the redirect (performing an HTTP get operation to Other website's signon servlet with the username and the digest key).
6.The other website will check if the parameter's passed is the same as the one passed earlier, if the user is who he says he is then he is redirected to the main page of the application.
7.The browser will then redirect the user to Other website's main page (welcome.jsp).
There seems's to be many calls to this other website that needs to be performed behind the scenes once a user clicks the link on my website.
Please suggest and help me out.........
Edited by: 836726 on Feb 21, 2011 3:41 PMWhy are you trying to build a whole federated single sign on framework from scratch when you can just use/buy an existing and proven solution instead? There are a lot of security implication and trust issues involved for this so unless you already understand all of those I'd advise you not to re-invent the wheel. There are a lot of products available that do this. Try searching for '<vendor name> Access Manager' or OpenSSO.
-
Choice between JSP and Servlet
I am new to JSP and Servlet. I know JSP container will convert JSP to servlet
eventually. But in application development's standpoint, anything can be
done in servlet can also be done in JSP? Some people told me we can
use the combination of both in one application.
My question is in what situation we use JSP alone, servlet alone, or
combination of both??
Please advise. Thanks!!Use a combination of both.
Your Web application should have a single servlet that all HTTP requests are POSTed to. All the servlet does is act like a traffic cop: it figures out what the request is, delegates to other objects that do the work, and forward the result to the next JSP, whatever that is. It's called a front controller servlet.
The JSPs should just be pure dynamic presentation. Everything displayed in the pages should have been generated by the servlet and its helper classes. No database queries, etc. Your JSPs will be a lot better off if you learn JSTL and eliminate all scriptlet code.
Check out frameworks like Struts. -
How to upload a file into server using j2ee jsp and servlet with bean?
How to upload a file into server using j2ee jsp and servlet with bean? Please give me the reference or url about how to do that. If related to struts is more suitable.
Anyone help me please!u don't need j2ee and struts to do file uploading. An example is as such
in JSP. u use the <input> file tag like
<input type="file"....>You need a bean to capture the file contents like
class FileUploadObj {
private FormFile srcFile;
private byte[] fileContent;
// all the getter and setter methods
}Then in the servlet, you process the file for uploading
* The following loads the uploaded binary data into a byte Array.
FileUploadObj form = new FileUploadObj();
byte[] byteArr = null;
if (form.signFile != null) {
int filesize = form.srcFile.getFileSize();
byteArr = new byte[filesize];
ByteArrayInputStream bytein = new ByteArrayInputStream (form.srcFile.getFileData());
bytein.read(byteArr);
bytein.close();
form.setFileContent(byteArr);
// Write file content using Writer class into the destination file in the server.
... -
Load balancing for JSPs and servlets
Hi:
I am using IIS as the proxy server, with the WLS plug-in, to a WLS
cluster. This provides round robin load balancing just fine. Will it
provide weight based load balancing if I set 'weblogic.system.weight'
differently on each server, or is that not relevant for clustering JSPs
and servlets?
Sincerely,
Ashish
Currently the plugins ( for NES, IIS and Apache) just use the round robin
algorithm. the property
weblogic.system.weight is used only be weblogic's replica aware clusterable
RMI/EJB stubs.
To use this property for your JSP/Servlet load balancing you have to use
weblogic server as proxy fron-ending your weblogic cluster.
--Viresh Garg
Ashish Vimal wrote:
> Hi:
> I am using IIS as the proxy server, with the WLS plug-in, to a WLS
> cluster. This provides round robin load balancing just fine. Will it
> provide weight based load balancing if I set 'weblogic.system.weight'
> differently on each server, or is that not relevant for clustering JSPs
> and servlets?
> Sincerely,
> Ashish
-
hello:
i've downloaded ECLIPSE 3.2,TOMCAT 5.5 .
i tried to build simples examples o servlets but i failed could you please tell me how to proceed?i'm new at this plus i've got a project to do with all this so plz can you give some links to go,i tried but no links was clear.
i've got to give to my professor an examples executed (servlets,jsp)
thank youHISSO wrote:
i wil give up on talking about stupid gossip
you must act professional and i you can't help it's ok
so plz i juste want help
i'm so busy finishing my studies
when it comes to talk about development with tomcat and eclipse together i'm new so i need some advices,so plz let's be serious!
i'm working hard to finish my project!Try to communicate less like a monkey with electrodes attached to it's genitals. This means stop using words like "plz" and write "please" instead.
If you want specific help with a specific problem then you should ask a specific question. "help, JSP and SERVLETS" is not a specific question. And you should also note that if your specific question is about Tomcat specifically or Eclipse specifically then you are in the wrong place to begin with.
So do you want to try again?
Maybe you are looking for
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