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Spring MVC Interview Questions and Answers

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Spring MVC Interview Questions and Answers Toggle navigation In28Minutes Download Java Interview Pdf Guide Popular Video Courses Buy Java Interview Video Guide - $12.99/₹799 Start learning on Udemy today! Spring MVC Interview Questions and Answers How does request spritz happen in Spring MVC? Can you list a few advantages of using Spring MVC framework? Give examples of important Spring MVC annotations? Can you explain the concept of Interceptors in Spring MVC? Interceptors can be configured using the interceptors property. How do you schedule tasks with Spring? How do you integrate Spring MVC with tiles? How do you configure Spring MVC web using to use UTF-8 encoding for handling forms? How do you enable spring security for a web application? How does request spritz happen in Spring MVC? Shown in the picture below. DispatcherServlet acts as the front controller. Simplified deportment taken by DispatcherServlet are listed below. All requests victorious at the DispatcherServlet (Front Controller) - STEP 0 in Figure DispatcherServlet resolves theme and locale as configured. Find’s towardly Controller (Handler) to handle the request. (pre-processors and post-processors, if configured) (STEP 1) Redirect to the Controller (Handler) - STEP 2. Controller executes the request and returns a view name and a view model object. (STEP 3,4,5) DispatcherServlet resolves the view name and redirects to the view template. The response html is returned to DispatcherServlet. (STEP 6) DispatcherServlet send the response when to the browser. (STEP 7) Can you list a few advantages of using Spring MVC framework? In Spring Web MVC, any POJO can be used as a writ or form-backing object. Highly flexible databinding – If there is a type mismatch, it is shown as a validation error on the screen. Business POJO’s can directly be used as form-backing objects. Flexible view resolution: Controller can either select a view name and prepare model map for it or write directly to response stream. Supports JSP, Velocity and Freemarker view technologies. Can directly generate XML, JSON, Atom, and many other types of content. Highly user-friendly tag library. Give examples of important Spring MVC annotations? Important Spring MVC annotations are listed below. @Controller : This matriculation would serve as a controller. @RequestMapping : Can be used on a matriculation or a method. Maps an url on the matriculation (or method). @PathVariable : Used to map a dynamic value in the url to a method argument. Example 1 : Maps a url “/players “ for the controller method. @RequestMapping(value="/players", method=RequestMethod.GET) public String findAllPlayers(Model model) { Example 2 : If a url /players/15 is keyed in, playerId is populated with value 15. @RequestMapping(value="/players/{playerid}", method=RequestMethod.GET) public String findPlayer(@PathVariable String playerId, Model model) { Can you explain the concept of Interceptors in Spring MVC? Handler interceptors are used when you want to wield specific functionality to unrepealable requests. Handler Interceptors should implement the interface HandlerInterceptor. Three methods are defined: preHandle(..) is tabbed surpassing the very handler is executed; postHandle(..) is tabbed without the handler is executed; afterCompletion(..) is tabbed without the well-constructed request has finished. Interceptors can be configured using the interceptors property. <bean id="handlerMapping" class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"> <property name="interceptors"> <list> <ref bean="yourCustomHandlerInterceptor"/> </list> </property> </bean> How do you schedule tasks with Spring? Spring 3.0 introduced TaskScheduler utopian to deal with scheduling jobs. Spring has support for Timer (Jdk) and Quartz. Sample methods in the interface TaskScheduler are shown below: ScheduledFuture scheduleAtFixedRate(Runnable task, long period); ScheduledFuture scheduleWithFixedDelay(Runnable task, long delay); Scheduling can moreover be washed-up using an voice-over @Scheduled(fixedDelay=5000) public void doSomething() { // something that should execute periodically }Unelevatedexample shows scheduling with xml configuration <task:scheduler id="customScheduler" pool-size="30"/> <task:scheduled-tasks scheduler=" customScheduler "> <task:scheduled ref="someBean" method="someOtherMethod" fixed-delay="5000" initial-delay="1000"/> <task:scheduled ref="someOtherBean" method="someMethod" cron="*/5 * * * * MON-FRI"/> </task:scheduled-tasks> How do you integrate Spring MVC with tiles? Tiles helps us to pinpoint the layout for a web page. We can integrate Spring MVC with tiles by configuring TilesConfigurer and setting up towardly view resolver. <bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles2.TilesConfigurer" p:definitions="/WEB-INF/tiles-defs/templates.xml" /> <bean id="tilesViewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver" p:viewClass="org.springframework.web.servlet.view.tiles2.TilesView" /> How do you configure Spring MVC web using to use UTF-8 encoding for handling forms? Using org.springframework.web.filter.CharacterEncodingFilter. Shown below. <filter> <filter-name>encoding-filter</filter-name> <filter-class> org.springframework.web.filter.CharacterEncodingFilter </filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encoding-filter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> How do you enable spring security for a web application? Spring Security is used to implementHallmarkandPassportfor a web application. We can enable spring security by configuring an appropriae security filter. Example shown below. We can create a separate security-context.xml to pinpoint the hallmark and passport roles and accesses. <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class> org.springframework.web.filter.DelegatingFilterProxy </filter-class> </filter> <filter-mapping> <filter-name>springSecurityFilterChain</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> If you loved these Questions, you will love our PDF Interview Guide with 400+ Questions. 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