Java Spring MVC Framework with AngularJS by Google and HTML5
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The document provides an introduction to the Spring MVC framework. It describes key concepts such as MVC architecture, dependency injection, configuration of the DispatcherServlet, mapping requests to controllers, and defining views. It also discusses configuring ORM/JPA with Hibernate, sending emails, security, exceptions handling, and accessing REST services with RestTemplate. The document aims to give developers an overview of building web applications with Spring MVC.
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Java Spring MVC Framework with AngularJS by Google and HTML5
- 1. Introduction to Spring MVC Framework Tuna Tore
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- 3. What is MVC? MVC stands for Model View Controller (architecture) It is a design pattern used in WEB based JAVA Enterprise Applications MVC pattern is also implemented in other WEB frameworks as well for separating the model layer from view layer. By doing that UI programmers and back end developers can work together. Model Layer includes business specific logic View Layer is responsible for rendering(displaying) model objects inside the user interface using different view technogies (JSP, Facelets or Velocity) (browser) Controller receives user inputs and calls model objects based on handler mappings and pass model objects to views in order to display output inside the view layer.
- 4. What is Dependency Injection? This is also called as IOC (Inversion of Control Principle) It is a software design pattern which is really useful for designing loosely coupled software components You will have more plug-gable and testable code and objects It is easy to reuse your code in other applications The dependencies won't be hard coded inside all java objects/ classes instead they will be defined in XML configuration files or configuration classes (Java Config) Spring Container is responsible for injecting dependencies of objects There are two types of Dependency injection in Spring Framework Setter Injection and Constructor Injection
- 6. The general information about web.xml and Java EE The WEB-INF/web.xml is the Web Application Deployment Descriptor of Java Enterprise Web applications/ Inside web.xml, developers can define Servlets, Welcome File List Filters, Context parameters, Error pages Security rights and etc.
- 7. The general information about the sample web application Apache Maven Project Pivotal tc server Java Spring MVC 4.x version
- 8. What is the concept of DispatcherServlet and how do you configure it? DispatcherServlet is configured in order to dispatch incoming HTTP request to handlers and returns response to browsers Spring MVC is designed around DispatcherServlet DispatcherServlet is configured in web.xml file <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet- class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/mvc-config.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
- 9. What is the concept of DispatcherServlet and how do you configure it? DispatcherServlet is configured in order to dispatch incoming HTTP request to handlers and returns response to browsers Spring MVC is designed around DispatcherServlet DispatcherServlet is configured in web.xml file <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet- class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/mvc-config.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
- 10. What is ContextLoaderListener and how do you configure it in Spring MVC? ContextLoaderListener is responsible for creating a root application context in Java Enterprise Web application inside ServletContext Developers can use different controller and view layers (For example Struts, JSF or Spring MVC can be used) however Spring Framework will be responsible for managing services layer or components defined ContextLoaderListener configuration files You can set different configuration XML files in web.xml http://docs.spring.io/spring/docs/2.5.x/reference/mvc.html #mvc-servlet
- 11. How do you configure controllers in Spring MVC? By extending AbstractController class and implementing handleRequestInternal method By using @Controller or @RestController annotation on class level Controller with bean name URL mapping Controller with class name mapping Controller with XML config with mappings
- 12. How is an incoming request mapped to a mapped to a method in Spring MVC? @RequestMapping is used in order to map incoming request to a controller using URL matching @RequestParam and @PathVariable is used to get parameters or variable from HTTP request @RequestMapping(value = "/jdbcDelete/user/{iduser}", method=RequestMethod.GET) public ModelAndView jdbcDelete(@PathVariable(value="iduser") int iduser) { @RequestMapping(value="/register", method=RequestMethod.POST) public ModelAndView register(@RequestParam(required=true) String email,@RequestParam(required=true) String password)
- 13. What is a View in Spring MVC? How is the InternalResourceViewResolver configured? Java Spring MVC can be configured with different view technologies such as Java Server Faces, JSP, Velocity etc. Views are responsible for displaying the content of Model objects on browsers as response output InternalResourceViewResolver is used to resolve the correct view based on suffix and prefixes so the correct output (view) is resolved based on strings
- 14. Return types from Controllers You can return the followings from Controllers ModelAndView Model Map View String void HttpHeaders and others
- 15. Scopes in Spring MVC ● Default Scope in Spring MVC is request ● Session scope can be used in order to save the state of beans in web based applications ● Each time a request send through HTTP a new bean will be created with request scope
- 16. Application Event Handling ● Developers can handle application events by implementing ApplicationListener<ApplicationEvent> ● Customs events can be published by using application context and extending ApplicationEvent class
- 17. Spring MVC File Upload ● In order to upload a file with Java Spring MVC <!-- File Upload bean config--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartRe solver"> <!-- set the maximum file size in bytes --> <property name="maxUploadSize" value="1000000"/> </bean> @Controller public class FileUploadController { @RequestMapping(value="/uploadFile", method=RequestMethod.POST) public @ResponseBody String handleFileUpload(@RequestParam("file") MultipartFile file){
- 18. Quartz Scheduling Framework and Spring Schedules Quartz is an alternative to Spring Schedules and has more functionality In order to use Quartz; Triggers, Jobs, Tasks and Scheduler have to defined in XML configuration Spring Schedules can be configured using @Scheduled annotation @Scheduled(cron="0/30 * * * * ?") or @Scheduled(fixedDelay = 10000) can be applied to schedules
- 19. Logging in Spring MVC ● LOGBack framework will be used in order to log outputs ● LOGBack is a significantly improved version of log4j logging framework ● Both log4j and logback were founded with the same developer ● It is easy to switch logging technologies by using LOGBack ● The configuration is done through logback.xml ● By default Spring Framework use commons-logging so dependencies should be excluded in pom.xml
- 20. Apache Maven ● Apache Maven is a build automation and dependency management tool ● Apache Maven is configured using pom.xml file ● Maven is integrated into Eclipse or STS
- 21. JPA and Hibernate ORM ● JPA stands for Java Persistence API ● Hibernate ORM is an implementation of JPA ● ORM stands for Object Relational Mapping ● Hibernate ORM uses @Entity annotation to manage classes in ORM framework ● @Table(name="USER") is used to map Java Objects to Database Tables ● @Id and @Column(name="USERNAME") annotations can be used on field levels. ● @PersistenceContext has to be used on EntityManager
- 22. JDBC and JDBCTemplate ● JDBC stands for Java Database Connectivity ● It is an application programming interface API for connecting different databases ● Spring MVC uses jdbcTemplate in order to run queries on databases ● JdbcTemplate simplifies database access code ● JdbcTemplate handles database related exceptions and throws DataAccessException
- 23. PDF and Excel Documents ● In order to return PDF and Excel Documents org.springframework.web.servlet.view.XmlViewResolver has to be configured in Spring MVC Framework ● Documents have to extend related classes named as AbstractExcelView and AbstractPdfView ● Apache POI is used to generate PDFs inside sample applicaions ● Itext library is used to generate Excel documents
- 24. Spring MVC Java Config ● In order to configure Spring MVC with JavaConfig; @Configuration @EnableWebMvc @ComponentScan(basePackages = {"spring.javaconfig"}) public class JavaConfig extends WebMvcConfigurerAdapter { ● You don't need web.xml file with the new specification Servlet API 3.0+ public class WebInitializer implements WebApplicationInitializer { @Override public void onStartup(ServletContext servletContext) throws ServletException {
- 25. Spring MVC Email ● Spring MVC can send emails to users using Java Mail API ● Inside the sample application Velocity Email Template is used in order to send customized emails ● Velocity is configured in configuration files and template locations should be set <!-- Velocity Email Template Config Bean --> <bean id="velocityEngine" class="org.springframework.ui.velocity.VelocityEngineFactoryBean"> <property name="resourceLoaderPath" value="/WEB-INF/email-templates/"/> </bean>
- 26. Spring Security ● In order to activate Spring Security in Spring MVC applications, springSecurityFilterChain has to be configured in web.xml file with DelegatingFilterProxy ● Spring Security annotations and custom tags can be used in order to define java method level security <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter- class> </filter>
- 27. Spring Exception Handling ● Inside Spring MVC, users can define a exception handling class by implementing @Component public class ExceptionHandler implements HandlerExceptionResolver{ private static final Logger logger = LoggerFactory.getLogger(ExceptionHandler.class); @Override public ModelAndView resolveException(HttpServletRequest request,HttpServletResponse response, Object object, Exception exception) { logger.error("Error: ", exception); return new ModelAndView("error/exception","exception","ExceptionHandler message: " + exception.toString()); }
- 28. Spring REST with RestTemplate ● @RestController will add @ResponseBody annotations to all methods inside a class ● RestTemplate is used to access Rest Based Web Services ● @PathVariable is used in order to get variables from URL ● ResponseEntity class is used to map response to Java Objects
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