Spring Web MVC Reference & Tutorials day1


I read Web MVC framework - Reference Guide.
This article shows some basic ideas in Spring Web MVC.


🐞 Key Design Principle

A key design principle in Spring Web MVC and in Spring in general is
the “Open for extension, closed for modification” principle.

🎉 Features

  • Clear separation of roles
  • Powerful and strightforward configuration of both framework and application class as JavaBeans
  • Adaptability, non-insrusiveness, and flexibility
  • Reusable business code, no need for duplication
  • Customizable binding and validation
  • Customizable handler mappning and view resolution
  • Flexible model transfer
  • Customizable locale, time zone and theme resolution
  • A simple yet powerful JSP tag library, Spring tab library
  • A JSP form tag library
  • Beans whose lifecycle is scoped to the current HTTP request orf HTTP session

🚕 Front Controller Pattern

Spring MVC Architecture use “Front Controller Pattern”.

Front Controller do the following processes:

  • Receive client request
  • Convert request data to Java Object
  • Run input check(Bean Validation)
  • Call Handler(Controller)
  • Find View
  • Reply response data to client
  • Handle exception

spring-mvc-front-cotnroller-japanese

🚜 Arguments for Handler

  • Model : Interface having data to send to transition destination
  • RedirectAttributes : Interface having data to redirect destination
  • JavaBeans like Form Class : JavaBeans class having request parameter
  • BuindingResult : Interface having validation result by form input
  • MultipartFile : Interface having file info which was uploaded by using multipart-request
  • HttpEntity Interface having request header and request body
  • java.util.Locale : Client Locale
  • java.util.TimeZone / java.time.ZoneId : Client time zone when you use Java 8
  • java.security.Principal : Inteface having authorized client user info
  • UriComponetsBuilder : Interface to build URI

🎳 RequetMapping

The some attributes in @RequestMapping are as follows:

  • value: Set request path or path pattern
  • path: Alias of value attribute
  • method: HTTP Method (GET, POST, PUT) for mapping rule
  • params: Request Parameter for mapping rule
  • headers: Request header for mapping rule
  • consumes: Context-Type Header in request for mapping rule
  • produces: Accept Header in reqest for mapping rule
  • name: Original name for the mapping

🐡 Argument Annotation

Request Data

  • @PathValiable : Get value of path valiable in URL
  • @MatrixVariable : Get matrix value in URL
  • @RequestParam : Get value of request header
  • @RequestHeader : Get value of request header
  • @CookieValue : Get value in cookie
  • @RequestBody : Get content of request body

Not Request Data

  • @ModelAttribute : Get object of model as argment
  • @Value : Ge value by replacing from place holder like (${})

👽 Get Request Data

  • @PathVariable : Get path variable
  • @RequestParam : Get value of specified request parameter
  • @RequestHeader : Get value of specified request header
  • @CookieValue: Get value of specified request cookie
@RequestMapping(path = "detail", method = RequestMethod.Get)
public String detail(@RequestParam String format) {
    // ...
}

🐯 Terms

JavaBeans

JavaBeans are classes that encapsulate many objects into a sible object.
The name “Bean” was given to encompass this standard, which aims to create
resusable software components for Java.

JavaBeans - Wikipedia, the free encyclopedia

Nullary

The number of arguments or operands taken by a function or operator.

instantiate

To represent(an abstraction) by a concreate instance

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