MVC Applications
There are two types of MVC Applications:
| Web Servlet Based on Servlets Uses Servlets, Filters, Listeners | Web Reactive Non-blocking approach Supports reactive programming |
To use an War the Application class must extend from SpringBootServletInitializer.
Restful services
Principles for Rest:
- expose resources through url’s
- resources support limited set of operations
- clients can request an particular representation
- representations can link to others resources
- should be stateless
Crud operations
The components of the Request and Response are:
Request
- Method (also called Verb)
- URI (also called Endpoint)
- Body
Response
- Status Code
- Body
If you want to go into more depth around Request and Response methods, check out the HTTP standard.
The power of REST lies in the way it references a Resource, and what the Request and Response look like for each CRUD operation. Let’s take a look at what our API will look like when we’re done with this course:
- For CREATE: use HTTP method POST.
- For READ: use HTTP method GET.
- For UPDATE: use HTTP method PUT.
- For DELETE: use HTTP method DELETE.
Post vs Put
Controllers
@ResponseBody disables the View handling system.
@Controller
public class AccountController {
@GetMapping("/accounts")
public @ResponseBody List<Account> list(){
..
}
}@RestController annotation incorporates @Controller and @ResponseBody, assuming that Rest response data is returned.
Spring will automatically inject argument in the method endpoint: HttpServletRequest, HttpSession, Principal, Locale.
Method examples
Message converters
Response message format can be leverage with ResponseEntity by setting headers or content type.
