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Spring MVC
Spring MVC
Spring MVC -. Model-View-Controller -, . . View . .
Architecture - modules
Core Container
Core Container Core, Beans, Context, and Expression Language :
- Core - Bean BeanFactory
factory.- Context
Core Beans, ApplicationContext .
- Expression Language
Data Access/Integration
:- JDBC JDBC- ,
JDBC- ORM
- (ORM), JPA, JDO, Hibernate IBATIS.
- OXM , / XML JAXB, Castor XMLBeans, JiBX XStream.
- Java Messaging Service - JMS .
- Transaction - , POJOs.
Web
Web, Web-, Web-Struts -,
:- Web - ,
, - .
- Web-Servlet Spring Model-View-Controller (MVC) -.
- Web-Struts Struts -
- Web-portlet MVC
Miscellaneous
- AOP aspect-oriented programming method-interceptors pointcuts
- Aspects AspectJ AOP framework.- Instrumentation
class loader - Test Spring
Junit TestNG- Integration- Batch
HelloWorldController
public class HelloWorldController extends AbstractController {
private String message;
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {
return new ModelAndView("welcomePage","welcomeMessage", message);
// view name, model param name, model param
}
public void setMessage(String message) {
this.message = message;
}
}
web.xml
dispatcher org.springframework.web.servlet.DispatcherServlet 1
dispatcher*.htm
redirect.jsp
redirect.jsp
Redirect.jsp , Spring Web. JSP WEB-INF , , DispatcherServlet. view WEB-INF , .
dispatcher-servlet.xml
/WEB-INF/jsp/
Handler Mapping
DispatcherServlet BeanNameUrlHandlerMapping
/ex/view*.html=editAccountFormController/**/help.html=helpController
welcomePage.jsp
Welcome Page
${welcomeMessage}
Using annotations
dispatcher-servlet.xml
Using annotations
@Controller
@RequestMapping("/hello")
public class HelloController{
@RequestMapping(method = RequestMethod.GET)
public String printHello(ModelMap model) {
model.addAttribute("message", "Hello Spring MVC Framework!");
return "hello"; // name of the view
}
}
@RequestMapping(value = "/hello", method = RequestMethod.GET)
Form Handling
public class Student {private Integer age;private String name;private Integer id;public void setAge(Integer age) {
this.age = age;}public Integer getAge() {
return age;}public void setName(String name) { this.name = name; }public String getName() { return name;}public void setId(Integer id) {this.id = id;}public Integer getId() {return id; }
}
Form Handling
@Controllerpublic class StudentController {
@RequestMapping(value = "/student", method = RequestMethod.GET)public ModelAndView student() {
//"command" is required for tagsreturn new ModelAndView("student", "command", new Student());
}@RequestMapping(value = "/addStudent", method = RequestMethod.POST)public String addStudent(@ModelAttribute("SpringWeb")Student student,
ModelMap model) {model.addAttribute("name", student.getName());model.addAttribute("age", student.getAge());model.addAttribute("id", student.getId());return "result";
}}
student.jsp
Result.jsp
Spring IoC Containers
Spring IoC Containers - Spring Framework. , , , . Spring Container (DI) , . Spring Beans.
, . XML, Java , Java .
2
1) Spring BeanFactory Container , DI org.springframework.beans.factory.BeanFactory .BeanFactory , BeanFactoryAware, InitializingBean, DisposableBean2)Spring ApplicationContext Container enterprise ,
. org.springframework.context.ApplicationContext interface.
ApplicationContext BeanFactory
BeanFactory Container
public class HelloWorld {
private String message;
public void setMessage(String message){ this.message = message;}
public void getMessage(){System.out.println("Your Message : " + message);}
}
public class MainApp {
public static void main(String[] args) {
XmlBeanFactory factory = new XmlBeanFactory(new ClassPathResource("Beans.xml"));
HelloWorld obj = (HelloWorld) factory.getBean("helloWorld");
obj.getMessage();
}
}
ApplicationContext Container
import org.springframework.context.ApplicationContext;
Importorg.springframework.context.support.FileSystemXmlApplicationContext;
public class MainApp {
public static void main(String[] args) {
ApplicationContext context = new FileSystemXmlApplicationContext
("C:/src/Beans.xml");
HelloWorld obj = (HelloWorld) context.getBean("helloWorld");
obj.getMessage();
}
}
Spring Bean Scopes
singleton single instance per Spring IoC container (default).prototype a single bean definition to have any number of
instances.request HTTP request. Only valid in the context of a web-
aware Spring ApplicationContext.session HTTP session. Only valid in the context of a web-
aware Spring ApplicationContext.global-session global HTTP session. Only valid in the context
of a web-aware Spring ApplicationContext.
Autowiring
:no byName - property name.byType - by property datatype. constructor - similar to byType, but type applies to constructor
arguments. autodetect - Spring first tries to wire using autowire by constructor, if
it does not work, Spring tries to autowire by byType.
Annotation Based Config
@Required for settet methods and it indicates that the affected bean property must be populated in XML configuration file at
configuration time@Autowired -can be used to autowire bean @Qualifier - There may be a situation when you create more than one
bean of the same type and want to wire only one of them with a property
Autowiring
public class TextEditor {@Autowired(required=false)@Qualifier(check1")private SpellChecker spellChecker;public TextEditor() {
System.out.println("Inside TextEditor constructor." );}public SpellChecker getSpellChecker( ){ return spellChecker; }public void spellCheck(){spellChecker.checkSpelling();}
}
Autowiring
@Resource(name= "spellChecker")
public void setSpellChecker( SpellChecker spellChecker ){
this.spellChecker = spellChecker;
}
Q&A
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