Spring 3.x - Spring MVC

[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Spring MVC

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Spring MVC

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Spring MVC

Spring MVC ,[object Object],Servlet Application Context Spring MVC

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Spring MVC [1] Bob Martin, The Open-Closed Principle [2] Convention over configuration [3] Model View Controller – GoF design pattern

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Spring MVC [4] Strategy – GoF design pattern

[object Object],[object Object],Spring MVC 1 <web-app> 2 3 <servlet> 4 <servlet-name> petshop </servlet-name> 5 <servlet-class> 6 org.springframework.web.servlet.DispatcherServlet 7 </servlet-class> 8 <load-on-startup>1</load-on-startup> 9 </servlet> 10 11 <servlet-mapping> 12 <servlet-name> petshop </servlet-name> 13 <url-pattern>*.do</url-pattern> 14 </servlet-mapping> 15 16 </web-app> Servlet name

[object Object],[object Object],Spring MVC <servlet-name> /WEB-INF/ <servlet-name> - servlet.xml petshop /WEB-INF/ petshop- servlet.xml

[object Object],[object Object],Spring MVC

Spring MVC ,[object Object],Dispatcher Servlet Incoming request Outgoing response Controller (Bean) Delegate Rendered response View renderer Model (JavaBean) 1 2 3 4 (?) 5 (?) 6 Application context

Spring MVC ,[object Object],Dispatcher Servlet Controller View renderer

[object Object],Spring MVC Incoming HTTP request Set locale Simple controller adapter Annotation-based adapter Another servlet adapter Interceptors (postHandle) Interceptors (preHandle) Handler adapter View renderer Locale View Themes Security authorization Exception handler

[object Object],Spring MVC Incoming HTTP request Set locale Simple controller adapter Annotation-based adapter Another servlet adapter Interceptors (postHandle) Interceptors (preHandle) Handler adapter View renderer Exception handler Locale View Themes Security authorization Controller View

[object Object],Spring MVC Interceptors (postHandle) Incoming HTTP request Simple controller adapter Annotation-based adapter Another servlet adapter Handler adapter View renderer Exception handler Interceptors (preHandle) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Spring MVC Interceptors (preHandle) Interceptors (postHandle) Incoming HTTP request View renderer Exception handler Handler adapter Simple controller adapter Annotation-based adapter Another servlet adapter

[object Object],Spring MVC Interceptors (preHandle) Incoming HTTP request Simple controller adapter Annotation-based adapter Another servlet adapter Handler adapter View renderer Exception handler ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Interceptors (postHandle)

[object Object],Spring MVC Interceptors (postHandle) Interceptors (preHandle) Incoming HTTP request Simple controller adapter Annotation-based adapter Another servlet adapter Handler adapter Exception handler View renderer Locate current locale Render the appropriate view ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Spring MVC View renderer Interceptors (postHandle) Interceptors (preHandle) Incoming HTTP request Simple controller adapter Annotation-based adapter Another servlet adapter Handler adapter Exception handler DefaultHandlerExceptionResolver

[object Object],[object Object],Spring MVC Incoming HTTP request Handler adapter Controller bean-name mapping Controller class-name mapping Static mapping Based on annotations [GET] http://host.com/services/userInfo.do Handlers from application context

[object Object],Spring MVC 1 <? xml version = "1.0" encoding = "UTF-8" ?> 2 3 < beans > 4 5  6 < bean class = "org.springframework...ControllerClassNameHandlerMapping" /> 7 8  9 < bean class = "org.springframework.web.servlet.handler.SimpleUrlHandlerMapping" > 10 < property name = "mappings" > 11 < value > 12 /info.do=personalInformationController 13 </ value > 14 </ property > 15 </ bean > 16 17 < bean id = "personalInformationController“ 18 class = "com.cisco.mvc.controllers.PersonalInformationController" /> 19 20 </ beans >

[object Object],Spring MVC public interface Controller { public ModelAndView handleRequest( HttpServletRequest request, HttpServletResponse response) throws Exception; } View: Object ? Model: Key/Value map Model + View

[object Object],Spring MVC 1 public class LoginController implements Controller { 2 3 @Override 4 public ModelAndView handleRequest(HttpServletRequest request , 5 HttpServletResponse response) 6 throws Exception { 7 String username = request.getParameter( "j_username" ); 8 String password = request.getParameter( "j_password" ); 9 if (!validateUser(username, password)) { 10 return new ModelAndView( "invalidUsername.jsp", "uname", username ); 11 } else { 12 return new ModelAndView( "portal.jsp" ); 13 } 14 } 15 16 private boolean validateUser(String username, String password) { 17 // Validate user ... 18 } 19 }

[object Object],Spring MVC 1 public class LoginController implements Controller { 2 3 @Override 4 public ModelAndView handleRequest(HttpServletRequest request , 5 HttpServletResponse response) 6 throws Exception { 7 String username = request.getParameter( "j_username" ); 8 String password = request.getParameter( "j_password" ); 9 if (!validateUser(username, password)) { 10 int retryCount = Integer.parseInt(request.getParameter( "retries" )); 11 Map<String, Object> model = new Map<String, Object>(); 12 model.put( "uname" , username); 13 model.put( “retryCount“, retryCount + 1); 14 15 return new ModelAndView( "invalidUsername.jsp", model); 16 } else { 17 return new ModelAndView( "portal.jsp" ); 18 } 19 } 20 }

[object Object],Spring MVC << interface >> Controller MyController Handle incoming requests

[object Object],Spring MVC << interface >> Controller << abstract>> AbstractController MyController ,[object Object],[object Object],[object Object],[object Object],public ModelAndView handleRequest( HttpServletRequest request , HttpServletResponse response) throws Exception { ... }

[object Object],Spring MVC << interface >> Controller << abstract>> AbstractController MyController << abstract>> AbstractUrlViewController Resolve controller based on URL public ModelAndView handleRequestInt( HttpServletRequest request , HttpServletResponse response) throws Exception { ... }

[object Object],[object Object],[object Object],[object Object],[object Object],Spring MVC

[object Object],Spring MVC View resolver XmlViewResolver ResourceBundleViewResolver FreeMarkerViewResolver UrlBasedViewResolver View: “ login” View handlers

[object Object],Spring MVC <? xml version = "1.0" encoding = "UTF-8" ?> < beans > < bean id = "viewResolver" class = "org.springframework.web.servlet.view.UrlBasedViewResolver" > < property name = "prefix" value = "/WEB-INF/pages/" /> < property name = "suffix" value = ".jsp" /> </ bean > </ beans > View: “login” /WEB-INF/pages/ login .jsp

[object Object],[object Object],Spring MVC 1 @Controller 2 public class CalcController { 3 4 // [GET] http://host.com/example/ calculate?first=NNN&second=MMM 5 @RequestMapping ( "/calculate" ) 6 public String calculate(HttpServletRequest request) { 7 String first = request.getParameter( "first" ); 8 String second = request.getParameter( "second" ); 9 10 int firstInt = Integer. parseInt(first); 11 int secondInt = Integer. parseInt(second); 12 13 return Integer. toString(firstInt + secondInt); 14 } 15 }

[object Object],[object Object],Spring MVC 1 @Controller 2 public class CalcController { 3 4 // [POST] http://host.com/example/ calculate?first=NNN&second=MMM 5 @RequestMapping (value = "/calculate", method = RequestMethod.POST) 6 public String calculate(HttpServletRequest request) { 7 String first = request.getParameter( "first" ); 8 String second = request.getParameter( "second" ); 9 10 int firstInt = Integer. parseInt(first); 11 int secondInt = Integer. parseInt(second); 12 13 return Integer. toString(firstInt + secondInt); 14 } 15 }

[object Object],[object Object],Spring MVC 1 @Controller 2 public class CalcController { 3 4 // [POST] http://host.com/example/ calculate?first=NNN&second=MMM 5 @RequestMapping (value = "/calculate", method = RequestMethod.POST) 6 public String calculate(@RequestParam( "first" ) int first, 7 @RequestParam( “second" ) int second) { 8 return Integer. toString(first + second); 9 } 10 }

[object Object],[object Object],Spring MVC 1 @Controller 2 public class CalcController { 3 4 // [POST] http://host.com/example/ calculate/add?first=NNN&second=MMM 5 @RequestMapping (value = "/calculate/add", method = RequestMethod.POST) 6 public String calculate(@RequestParam( "first" ) int first, 7 @RequestParam( “second" ) int second) { 8 return Integer. toString(first + second); 9 } 4 // [POST] http://host.com/example/ calculate/sub?first=NNN&second=MMM 5 @RequestMapping (value = "/calculate/sub", method = RequestMethod.GET) 6 public String calculate(@RequestParam( "first" ) int first, 7 @RequestParam( “second" ) int second) { 8 return Integer. toString(first - second); 9 } 10 }

[object Object],[object Object],Spring MVC 1 @Controller 2 public class WeatherController { 3 4 // [GET] http://host.com /weather/972/TelAviv 5 @RequestMapping (value = "/weather/{countryCode}/{cityName}" ) 6 public ModelAndView getWeather( @PathVariable ( "countryCode" ) int countryCode, 7 @PathVariable ( "cityName" ) String cityName) { 8 ModelAndView mav = new ModelAndView(); 9 // Fill in model the relevant information. 10 // Select a view appropriate for country. 11 return mav; 12 } 13 }

[object Object],[object Object],Spring MVC 1 @Controller 2 public class WeatherController { 3 4 @ExceptionHandler (IllegalArgumentException. class ) 5 public String handleException(IllegalArgumentException ex, 6 HttpServletResponse response) { 7 return ex.getMessage(); 8 } 9 }

[object Object],[object Object],Spring MVC @Controller public class FileUploadController { @RequestMapping (value = "/uploadFile" , method = RequestMethod. POST ) public String handleFormUpload( @RequestParam ( "name" ) String filename, @RequestParam ( "file" ) MultipartFile file) { if (success) { return "redirect:uploadSuccess" ; } else { return "redirect:uploadFailure" ; } } }

[object Object],[object Object],Spring MVC @Controller public class FileUploadController { @RequestMapping (“/portal” ) public String enterPortal( @CookieValue ( “lastVisited“ ) Date lastVisited) { } @RequestMapping (“/console” ) public String enterPortal( @CookieValue (value = “lastVisited“, required = “true” ) Date lastVisited) { } }

[object Object],[object Object],Spring MVC 1 @Controller 2 @SessionAttributes ( "userid" ) 3 public class PersonalInformationController { 4 5 @RequestMapping ( "/loginCheck" ) 6 public String checkUserLoggedIn( @ModelAttribute ( "userid" ) int id) { 7 // ... 8 } 9 }

[object Object],[object Object],Spring MVC 1 <? xml version = "1.0" encoding = "UTF-8" ?> 2 3 < beans > 4 5  6 < context:annotation-config /> 7 8  9 < context:component-scan base-package = "com.cisco.mvc" /> 10 11  12 < mvc:annotation-driven /> 13 14 < mvc:interceptors > 15 </ mvc:interceptors > 16 17 </ beans >

[object Object],[object Object],Spring MVC 1 <? xml version = "1.0" encoding = "UTF-8" ?> 2 3 < beans > 4 5 < mvc:interceptors > 6 < bean class = "com.cisco.mvc.interceptors.SecurityInterceptor" /> 7 </ mvc:interceptors > 8 9 < mvc:resources mapping = "/static/**" location = "/pages/" /> 10 11 < mvc:view-controller path = "/" view-name = “homePage" /> 12 13 </ beans >

[object Object],[object Object],[object Object],[object Object],Spring MVC

Spring 3.x - Spring MVC

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Spring 3.x - Spring MVC