49 lines
1.3 KiB
Plaintext
49 lines
1.3 KiB
Plaintext
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[[mvc-controller]]
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= Annotated Controllers
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[.small]#<<web-reactive.adoc#webflux-controller, See equivalent in the Reactive stack>>#
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Spring MVC provides an annotation-based programming model where `@Controller` and
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`@RestController` components use annotations to express request mappings, request input,
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exception handling, and more. Annotated controllers have flexible method signatures and
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do not have to extend base classes nor implement specific interfaces.
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The following example shows a controller defined by annotations:
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[source,java,indent=0,subs="verbatim,quotes",role="primary"]
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.Java
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----
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@Controller
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public class HelloController {
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@GetMapping("/hello")
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public String handle(Model model) {
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model.addAttribute("message", "Hello World!");
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return "index";
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}
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}
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----
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[source,kotlin,indent=0,subs="verbatim,quotes",role="secondary"]
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.Kotlin
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----
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import org.springframework.ui.set
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@Controller
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class HelloController {
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@GetMapping("/hello")
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fun handle(model: Model): String {
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model["message"] = "Hello World!"
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return "index"
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}
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}
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----
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In the preceding example, the method accepts a `Model` and returns a view name as a `String`,
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but many other options exist and are explained later in this chapter.
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TIP: Guides and tutorials on https://spring.io/guides[spring.io] use the annotation-based
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programming model described in this section.
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