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Controller Functions
Describe the functions of Controller?
kotapati.krishna
- Jul 7th, 2010
When I was using controller functions in servlets container the total servlet programming under control the service(), userdefined methods.
prateeks88
- Nov 4th, 2008
Controller as the name specifies is a part of the application server that controlles the whole application.In MVC(if you are aware of model,view,controller) the maintasks of the controller are:1> Take...
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_jspService() Method
Why do we use underscore(_) symbol only with jspService() method?
kotapati.krishna
- Jul 7th, 2010
Servlets Life cycle methods:init(),service(),destroy(). If I can use those methods in any Servlet web application programming it is internally servlet container treated as _jspservice() and this method generating code on Java with normal basic code.
rhingarajiya
- Jul 8th, 2009
Any methods are not be overriden by end users are typically written starting with '-'. _jspService method is not also be overriden by end users.Container invoke this method for each request, passing the request and response object.
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Servlets Questions
1)What is web.xml?2)what is the filter?3)How to we create a new JSTL class?4)When we are developing the project which collections mostly used?5)Difference between reqeust.getAttribute,and request.getParameter?
rizwan.amd
- Sep 1st, 2010
1) What is web.xml? As this is a deployment descriptor, this is mandatory for an web application to deploy in web/application server. It contains servlets name, url pattern, load on startup, if ...
fcasttro
- Nov 21st, 2007
1)What is web.xml?web.xml is nothing but a deployment descriptor. It describes a web applicants deployment settings.2)what is the filter?It is an Pluggable web componenet device it allow us to impleme...
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While using cookies, when the browser is shut down. will the data be available at next open of browser. If not available, how to over come that.
pdommara
- Sep 16th, 2010
Hi guys, Thanks for your answers, but no one could not able to answer exactily. Here my try is : We can use cookies to store the permenentily at browser by setting cookie.setmaxAge(0...
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What are the Characteristics of Servlets?
The characteristics of servlets that have gained them a wide spread acceptance are as follows:1.Servlets are efficient:The initialization code for a servlet is executed only when the servlet is executed for the first time.Subsequently, the requests that are received by the servlet are processed by its service() method.This helps to increase the efficiency of the server by avoiding creation of unnecessary...
Ashwinshenoy7
- May 9th, 2011
To start with, servlets are small Java programs that run on the server side of a web program. Where as Applets are small Java programs that run on the client side.Characterisctics of servlets are...
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Why is that we deploy servlets in a webserver.What exactly is a webserver?
bharathwatch
- Jul 9th, 2011
Webserver is a piece of s/w that takes the request from client(browser) and passes that request to appropriate web resource program and it provides services to application(creating obj,call the method...
pavan kumar
- May 8th, 2007
A Web server handles the HTTP protocol. When the Web server receives an HTTP request, it responds with an HTTP response, such as sending back an HTML page. To process a request, a Web server may respo...
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What is the difference between JSP and SERVLETS
bharathwatch
- Jul 9th, 2011
Both are used to develop server side web applications.but mainly the jsp is used to develop presentation logic..jsp uses tags to develop web pages and it embeds java code,html,template text.in this we...
indojapan
- Mar 2nd, 2009
Both JSP and Servlets provide dynamic content features. Its difficult to point out the difference as a JSP is ultimately converted into a Servlet and run on Server. Basically, its the separation of ro...
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Do we have a constructor in servlet ? can we explictly provide a constructor in servlet programme as in java program ?
bharathwatch
- Jul 9th, 2011
Servlet container creates object for our class when the default constructor is there in our class..if not provide then container will take care about that...
ankita surendra bimal
- Feb 12th, 2011
No, we dont have a constructor in servlet as the objects in servlet are created by webserver.
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What is a Singleton class. How do you write it ?
Dayanand Chowdhary
- Jul 30th, 2011
For every Servlet there will be only one Servlet Object, if at all multiple requests are arriving then the existing Servlet Object vl be retrieved(i.e a new Servlet Object is not created)
internally web servers are using SingleTon Design pattern...........
eg:Apache Tomcat Server.sampra
- Mar 4th, 2008
Singleton class can be created by defining the class static and making its constructor private so that no other class can user the new() keyword to create the instance of the singleton class. It will provide a public method which will create or return the already created singleton class object.
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What is the difference between servlets and applets?
Servlets are to servers. Applets are to browsers. Unlike applets, however, servlets have no graphical user interface.
shubhra
- Oct 1st, 2011
Applet have no main method. It executes in browser
but servlet is a server side program it executes in application server.jimmy514in
- Jul 3rd, 2010
But Servlet is a Server Side Component. It is a Controller in the MVC architecture, It is used to perform business logic and does not deal with the visual implementation. The visual part is done by us...
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Write a java servlet to read two parameters ?
Write a java servlet which reads two parameters from the web page,say,value 1 and value 2,which are of type integers,and finds the sum of the two values and return back the result as a web page
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How to get one Servlet's Context Information in another Servlet?
Access or load the Servlet from the Servlet Context and access the Context Information
Suresh Yerra
- Dec 11th, 2011
We can get the Servlet Context informaiton by using getNamedDispatcher() method in ServletContext.
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Servlet container
What is difference between servlet container and servlet config?
delindia
- Dec 20th, 2011
A servlet config object is used by a servlet container, to pass information to a servlet during initialization. The webserver uses separate module to load and run the servlets called servlet containe...
srini235
- May 20th, 2008
Servlet container is part of web server which provides run time environment for servlets i.e it manages the entaire life cycle for the servlets like it creates instance,initialization,processing and destroying it.
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Applet trusted or not
by default applets are trusted or untrusted?
is it possible to connect with database using applet program using type1 driver?Murali100
- Oct 7th, 2012
Applets are trusted.But we can use Type 3 Driver & Type 4 driver to connect the database
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Consider a scenario in which 4 users are accessing a servlet instance. Among which one user called destroy() method. What happens to the rest 3 users?
Janga Yella Raju
- May 25th, 2013
Calling destroy method by himself. Doesnt means destroying the servlet. Container will take care to destroy the servlet when application undeployed or system shut downs. So, if 1 user calls destroy m...
sampra
- Mar 4th, 2008
If there are 4 user and one has distroy the thred then thread which he is using only that will be distroy rest will be keep alive
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Servlets Interview Questions
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