What is the difference between JSF Servlet and JSP

Question

I have some questions  These are     How are JSP and Servlet related to each other  Is JSP some kind of Servlet   How are JSP and JSF related to each other   Is JSF some kind of Pre-Build UI based JSP like ASP NET-MVC

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Servlets             The Java Servlet API enables Java developers to write server-side code   for delivering dynamic Web content  Like other proprietary Web server   APIs  the Java Servlet API offered improved performance over CGI    however  it has some key additional advantages  Because servlets were   coded in Java  they provides an object-oriented  OO  design approach   and  more important  are able to run on any platform  Thus  the same   code was portable to any host that supported Java  Servlets greatly   contributed to the popularity of Java  as it became a widely used   technology for server-side Web application development       JSP        JSP is built on top of servlets and provides a simpler  page-based   solution to generating large amounts of dynamic HTML content for Web   user interfaces  JavaServer Pages enables Web developers and designers   to simply edit HTML pages with special tags for the dynamic  Java   portions  JavaServer Pages works by having a special servlet known as   a JSP container  which is installed on a Web server and handles all   JSP page view requests       The JSP container translates a requested   JSP into servlet code that is then compiled and immediately executed    Subsequent requests to the same page simply invoke the runtime servlet   for the page  If a change is made to the JSP on the server  a request   to view it triggers another translation  compilation  and restart of   the runtime servlet       JSF         JavaServer Faces is a standard Java framework for building user   interfaces for Web applications  Most important  it simplifies the   development of the user interface  which is often one of the more   difficult and tedious parts of Web application development    Although it is possible to build user interfaces by using foundational   Java Web technologies such as Java servlets and JavaServer Pages    without a comprehensive framework designedfor enterprise Web   application development  these core technologies can often lead to   avariety of development and maintenance problems  More important  by   the time the developers achieve a production-quality solution  the   same set of problems solved by JSF will have been solved in a   nonstandard manner        JavaServer Faces is designed to simplify the   development of user interfaces for Java Web applications in the   following ways        It provides a component-centric    client-independent development approach to building Web user   interfaces  thus improving developer productivity and ease of use        It simplifies the access and management of application data from the   Web user interface        It automatically manages the user interface   state between multiple requests and multiple clients in a simple and   unobtrusive manner        It supplies a development framework that is   friendly to a diverse developer audience with different skill sets        It describes a standard set of architectural patterns for a web   application      Source   Complete reference JSF

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See http   www oracle com technetwork java faq-137059 html     JSP technology is part of the Java   technology family  JSP pages are   compiled into servlets and may call   JavaBeans components  beans  or   Enterprise JavaBeans components    enterprise beans  to perform   processing on the server  As such  JSP   technology is a key component in a   highly scalable architecture for   web-based applications    See https   jcp org en introduction faq     A  JavaServer Faces technology is a   framework for building user interfaces   for web applications  JavaServer Faces   technology includes       A set of APIs for  representing UI   components and managing their state    handling events and input validation    defining page navigation  and   supporting internationalization and   accessibility       A JavaServer Pages  JSP  custom tag   library for expressing a JavaServer   Faces interface within a JSP page    JSP is a specialized kind of servlet   JSF is a set of tags you can use with JSP

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that is true that JSP is converted into servlet at the time of execution  and JSF is totally new thing in order to make the webpage more readable as JSF allows to write all the programming structures in the form of tag

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Servlets are the server side java programs which execute inside the web container  The main goal of the servlet is to process the requests received from the client   Java Server Pages is used to create dynamic web pages  Jsp s were introduced to write java plus html code in a single file which was not easy to do in servlets program  And a jsp file is converted to a java servlet when it is translated   Java Server Faces is a MVC web framework which simplifies the development of UI

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There are also situations where you can favor JSP over JSF  The application nature should be the deciding factor to choose the technology    If you have a rich GUI interaction and lot of Java scripting needed then favor JSF  Basically if your GUI app architecture is like Component oriented  amp  even driven like Swing then JSF is the best   If the application is just a plain form submitting  not much of GUI interaction needed  then JSP could do well if learning a new tech is an overhead and also complex framework is unnecessary

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Java Server Pages  JSP  is java technology which enables Web developers and designers to rapidly develop and easily maintain  information-rich  dynamic Web pages that leverage existing business systems   JSP technology separates the user interface from content generation  enabling designers to change the overall page layout without altering the underlying dynamic content   Facelets is the first non JSP page declaration language designed for JSF  Java Server Faces  which provided a simpler and more powerful programming model to JSF developers as compare to JSP  It resolves different issues occurs in JSP for web applications development    Here is a table that compares the features of scriplets and facelets    Source

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JSPs are the View component of MVC  Model View Controller    The Controller takes the incoming request and passes it to the Model  which might be a bean that does some database access   The JSP then formats the output using HTML  CSS and JavaScript  and the output then gets sent back to the requester

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JSP means HTML Java Code    JSP have it s own life cycle jsp init   jsp service   jsp destroy  After first request JSP convert to  java file  There is three type of tag we are using 1  Scriptless   lt      gt    Here developer can declare all those things which developer want to take the data    2  Expression tag   lt       gt    Here developer can use some print related data  3  Declaration   lt      gt    Here developer can declare some method related data   Servlet    Servlet have it s own life cycle   init   service   destroy     After first request container will read the data from web xml file then after out welcome fill will be display  Now onward after performing action it will search the url and after this process it will search the particular servlet there it self  service operation will perform   JSF    JSF have it s own ui and it s life cycle can perform in six way   A Restore view phase B Apply request values phase C Process validations phase D Update model values phase E Invoke application phase F Render response phase   For ui here for table here we are using panel grid and there is different faces for this that is   Rich Faces Prime Faces

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JSF is an advanced framework wherein its very easy to implement Model-View-Controller  MVC  based architecture for projects  Main advantage of JSF over JSP is the easy dynamic rendering of the components on the browser based upon conditions and easy integration of ajax events   The front end of the JSF application i e  xhtml files are the ones which are shown to the user via browser  These xhtml files internally invoke managed beans e g  controllers wherein actual application logic is written   The controllers internally invoke various services which communicate with database  using Hibernate or JPA API   This is how the flow happens in short   JSF is also used in combination with RichFaces which is a framework for giving rich look and feel to your web application    JSF   RichFaces   Hibernate JPA is a good technology to learn for sure

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JSP stands for JAVA SERVER PAGE          jsp is not a servlet  Jsp uses code and HTML tag both in itself you dont need to make a HTML and a servlet seprately Jsp are playing magnificent role in web application  Servlet is a java class plays an role to make your HTML page from static to dynamic

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From Browser Client perspective  JSP and JSF both looks same  As Per Application Requirements goes  JSP is more suited for request - response based applications    JSF is targetted for richer event based Web applications  I see event as much more granular than request response    From Server Perspective  JSP page is converted to servlet  and it has only minimal behaviour   JSF page is converted to components tree by specialized FacesServlet  and it follows component lifecycle defined by spec

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The basic difference between Servlets and JSP is that in Servlets we write java code and in that we embed HTML code and there is just reverse case with JSP   In JSP we write HTML code and in that we embed java code using tags provided by JSP

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Servlet - it s java server side layer    JSP - it s Servlet with html JSF - it s components base on tag libs JSP - it s converted into servlet once when server got request

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Jsp is also having in built servlet code which don t need any external compilation it can be run directly run  Changes will take effect in jsp directly in a browser   Servlet need to be compiled  i e it will have specific class creation   Jsf is a view component of MVC Framework

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JSP  JavaServer Pages  JSP is a Java view technology running on the server machine which allows you to write template text in client side languages  like HTML  CSS  JavaScript  ect    JSP supports taglibs  which are backed by pieces of Java code that let you control the page flow or output dynamically  A well-known taglib is JSTL  JSP also supports Expression Language  which can be used to access backend data  via attributes available in the page  request  session and application scopes   mostly in combination with taglibs  When a JSP is requested for the first time or when the web app starts up  the servlet container will compile it into a class extending HttpServlet and use it during the web app s lifetime  You can find the generated source code in the server s work directory  In for example Tomcat  it s the  work directory  On a JSP request  the servlet container will execute the compiled JSP class and send the generated output  usually just HTML CSS JS  through the web server over a network to the client side  which in turn displays it in the web browser  Servlets Servlet is a Java application programming interface  API  running on the server machine  which intercepts requests made by the client and generates sends a response  A well-known example is the HttpServlet which provides methods to hook on HTTP requests using the popular HTTP methods such as GET and POST  You can configure HttpServlets to listen to a certain HTTP URL pattern  which is configurable in web xml  or more recently with Java EE 6  with  WebServlet annotation  When a Servlet is first requested or during web app startup  the servlet container will create an instance of it and keep it in memory during the web app s lifetime  The same instance will be reused for every incoming request whose URL matches the servlet s URL pattern  You can access the request data by HttpServletRequest and handle the response by HttpServletResponse  Both objects are available as method arguments inside any of the overridden methods of HttpServlet  such as doGet   and doPost    JSF  JavaServer Faces  JSF is a component based MVC framework which is built on top of the Servlet API and provides components via taglibs which can be used in JSP or any other Java based view technology such as Facelets  Facelets is much more suited to JSF than JSP  It namely provides great templating capabilities such as composite components  while JSP basically only offers the  lt jsp include gt  for templating in JSF  so that you re forced to create custom components with raw Java code  which is a bit opaque and a lot of tedious work  when you want to replace a repeated group of components with a single component   Since JSF 2 0  JSP has been deprecated as view technology in favor of Facelets  Note  JSP itself is NOT deprecated  just the combination of JSF with JSP is deprecated  Note  JSP has great templating abilities by means of Taglibs  especially the  Tag File  variant   JSP templating in combination with JSF is what is lacking  As being a MVC  Model-View-Controller  framework  JSF provides the FacesServlet as the sole request-response Controller  It takes all the standard and tedious HTTP request response work from your hands  such as gathering user input  validating converting them  putting them in model objects  invoking actions and rendering the response  This way you end up with basically a JSP or Facelets  XHTML  page for View and a JavaBean class as Model  The JSF components are used to bind the view with the model  such as your ASP NET web control does  and the FacesServlet uses the JSF component tree to do all the work  Related questions  What is the main-stream Java alternative to ASP NET   PHP  Java EE web development  what skills do I need  How do servlets work  Instantiation  session variables and multithreading What is a Javabean and where are they used  How to avoid Java code in JSP files  What components are MVC in JSF MVC framework  What is the need of JSF  when UI can be achieved with JavaScript libraries such as jQuery and AngularJS

[java] What is the difference between JSF, Servlet and JSP?

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