Question: What Is Value In @RequestMapping?

Can RequestParam be null?

You could change the @RequestParam type to an Integer and make it not required.

This would allow your request to succeed, but it would then be null.

You could explicitly set it to your default value in the controller method: @RequestMapping(value = “/test”, method = RequestMethod..

What is difference between @RequestParam and @PathVariable?

The @PathVariable annotation is used for data passed in the URI (e.g. RESTful web services) while @RequestParam is used to extract the data found in query parameters. These annotations can be mixed together inside the same controller. @PathParam is a JAX-RS annotation that is equivalent to @PathVariable in Spring.

What is @ComponentScan?

The @ComponentScan annotation is used with the @Configuration annotation to tell Spring the packages to scan for annotated components. @ComponentScan also used to specify base packages and base package classes using thebasePackageClasses or basePackages attributes of @ComponentScan.

Is @RequestBody required?

With Spring’s latest version, if you use @RequestBody annotation, it makes client to send body all the time without making it optional.

Can we use @RequestBody with get?

Yes, you can send a request body with GET but it should not have any meaning.

What is @RestController?

Spring RestController annotation is a convenience annotation that is itself annotated with @Controller and @ResponseBody . This annotation is applied to a class to mark it as a request handler. Spring RestController annotation is used to create RESTful web services using Spring MVC.

Why do we need Spring MVC?

Rapid development – The Spring MVC facilitates fast and parallel development. Reusable business code – Instead of creating new objects, it allows us to use the existing business objects. Easy to test – In Spring, generally we create JavaBeans classes that enable you to inject test data using the setter methods.

What is the difference between @RequestParam and @RequestBody?

@RequestParam makes Spring to map request parameters from the GET/POST request to your method argument. @RequestBody makes Spring to map entire request to a model class and from there you can retrieve or set values from its getter and setter methods.

Can we have two @RequestBody?

Multiple requestbody values in one controller method Multiple @RequestBody values in one controller method, , and than create the objects you have in the arguments. You cannot use two @RequestBody as it can bind to a single object only (the body can be consumed only once).

How do you use Requestboram and RequestBody together?

The handler for @RequestBody reads the body and binds it to the parameter. The handler for @RequestParam can then get the request parameter from the URL query string. The handler for @RequestParam reads from both the body and the URL query String.

What is @RequestMapping?

@RequestMapping is one of the most common annotation used in Spring Web applications. This annotation maps HTTP requests to handler methods of MVC and REST controllers. In this post, you’ll see how versatile the @RequestMapping annotation is when used to map Spring MVC controller methods.

What is @RequestBody?

This is used to convert the body of the HTTP request to the java class object with the aid of selected HTTP message converter. This annotation will be used in the method parameter and the body of the http request will be mapped to that method parameter.

Which annotation is used to read a request from the client?

@RequestBody and @ResponseBody annotations are used to bind the HTTP request/response body with a domain object in method parameter or return type. Behind the scenes, these annotation uses HTTP Message converters to convert the body of HTTP request/response to domain objects.

How do I pass RequestParam?

In Spring MVC, the @RequestParam annotation is used to read the form data and bind it automatically to the parameter present in the provided method….Spring MVC RequestParam AnnotationAdd dependencies to pom.xml.