What is value in @RequestMapping?
value method is an alias for path method. This is an alias for path(). For example @RequestMapping(“/foo”) is equivalent to @RequestMapping(path=”/foo”). So both methods are similar in that sense.
What is @RequestMapping in Spring MVC?
One of the most important annotations in spring is the @RequestMapping Annotation which is used to map HTTP requests to handler methods of MVC and REST controllers. In Spring MVC applications, the DispatcherServlet (Front Controller) is responsible for routing incoming HTTP requests to handler methods of controllers.
What is the @RequestMapping annotation used for?
annotation. RequestMapping annotation is used to map web requests onto specific handler classes and/or handler methods. @RequestMapping can be applied to the controller class as well as methods.
Which of these are valid usage of @RequestMapping annotation in Spring MVC?
The @RequestMapping annotation can be applied to class-level and/or method-level in a controller. The class-level annotation maps a specific request path or pattern onto a controller. You can then apply additional method-level annotations to make mappings more specific to handler methods.
What is the difference between @RequestMapping and @GetMapping?
@RequestMapping is used at the class level while @GetMapping is used to connect the methods. This is also an important Spring MVC interview question to knowing how and when to use both RequestMapping and GetMapping is crucial for Java developers.
What is the difference between @RequestMapping and @PostMapping?
Both do the same job. The difference is that @PostMapping is part of a predefined group of compound annotations that internally use @RequestMapping . These annotations act as shortcuts that serve to simplify the mapping of HTTP methods and to more concisely express the methods of manipulation.
What is @RequestMapping and GetMapping?
What is the difference between @RequestMapping and PostMapping?
Can two controllers have same request mapping?
You cannot. A URL can only be mapped to a single controller. It has to be unique.
Can we use @PostMapping instead of @GetMapping?
Can I do this? If the method signatures are the same, then no. The GetMapping annotion handles a GET request, while PostMapping handles a POST request. You should not be using a GET call to persist data though – developer.mozilla.org/en-US/docs/Web/HTTP/Methods.
What is difference between @PathParam and @PathVariable?
@PathParam: it is used to inject the value of named URI path parameters that were defined in @Path expression. @Pathvariable: This annotation is used to handle template variables in the request URI mapping ,and used them as method parameters.
Can we use getmapping without RequestMapping?
It is always advised to be specific while declaring @RequestMapping on the controller methods as in most mapping handler classes, @Getmapping is not used. This feature distinguishes the @Getmapping and @RequestMapping annotations. It’s an annotation that serves as a shortcut for the @Requestmapping annotation.
Can we use getmapping instead of PostMapping?
If the method signatures are the same, then no. The GetMapping annotion handles a GET request, while PostMapping handles a POST request. You should not be using a GET call to persist data though – developer.mozilla.org/en-US/docs/Web/HTTP/Methods.
Which is better RequestMapping or GetMapping?
Can two classes have same request mapping?
Unfortunately, this is not possible. The request mapping has to be unique otherwise the application can’t determine which method the incoming request should be mapped to.
How does Spring MVC handle multiple requests?
In Spring, every request is executed in a separate thread. For example, when two users want to log in at the same time, the JVM creates two threads: one thread for the first user and another one for the second user. And these threads work with the singleton bean separately.
What is difference between @RequestMapping and @GetMapping?
What is difference between @path and @RequestMapping?
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.
Which is better query param or path Param?
PathParam could be used to drill down to entity class hierarchy. Whereas, QueryParam could be reserved for specifying attributes to locate the instance of a class. For example, /Vehicle/Car?
Can we have 2 controllers in Spring boot?
In Spring MVC, we can create multiple controllers at a time. It is required to map each controller class with @Controller annotation.
Can 2 controllers have same request mapping?
How do you handle millions of requests in Spring boot?
Spring Boot application can handle tons of requests
- Service A receives requests in its controller, then asynchronously write them into RocketMQ.
- Service B then subscribe the RocketMQ topic Service A wrote into and cache the messages into Redis in format of list.
What is difference between @PathParam and PathVariable?
What is difference between @RequestParam and @QueryParam?
What is main difference between @RequestParam and @QueryParam in Spring MVC controller? They’re functionally the same: they let you bind the value of a named HTTP param to the annotated variable. That being said, the question is very broad, so you’ll have to specify more detail if you want a more useful answer.
What is difference between controller and RestController?
@Controller is used to mark classes as Spring MVC Controller. @RestController annotation is a special controller used in RESTful Web services, and it’s the combination of @Controller and @ResponseBody annotation. It is a specialized version of @Component annotation.