This this tutorial you will learn about the Spring Annotation classes

Spring Web Annotation

Annotation is introduced since java 5. It is a new kind of instruction, syntax or meta data that provides data about the program and it is not a part of your program. Spring framework also provides a wide range of annotation, some of them which is commonly is used in Spring MVC is explained below.

@Controller - In Spring MVC you can make controller class very easily by prefixing @Controller before any class declaration.

@Controller
public class MyController {
}

@RequestMapping -The @RequestMapping annotation can be used with the classes or methods or both. It is used to specify the handler classes or methods that handles the particular request.

	/* Used with Class */
	@RequestMapping(value = "/page/")
	public class MyController {
	}

	/* Used with Method */
	@RequestMapping(value = "/load-page")
	public String loadPage(Model model) {
		return "home-page";
	}

@SessionAttribute - The Spring framework provides the more precise approach to keep the model object on the session by using SessionAttribute annotation.

@Controller
@RequestMapping(value = "/load-page")
@SessionAttributes("user")
public class MyController {

}

@ModelAttribute- The @ModelAttribute refers to the property of model class.

	@RequestMapping(value = "/load-page")
	public String loadPage(@ModelAttribute("user") User user) {
		return "home-page";
	}

@RequestParam- The @RequestParam is can be used to get the request parameters. It has three attributes value, required, and defaultValue. You can declare any number of @RequestParam annotations.

@RequestMapping(value = "/test-param")
	public String requestParam(@RequestParam(value = "name", required = true, defaultValue = "Default value") String name, @RequestParam(value="course")String course) {
		return "home-page";
	}

@PathVariable- This annotation is used to access URI variable.

	@RequestMapping(value = "/load-page/{userName}")
	public String pathVarible(@PathVariable(value = "userName") String userName) {
		return "home-page";
	}

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