Http Method : Difference Between Put & Patch | Putmapping vs Patchmapping - Spring MVC Annotation смотреть онлайн

#Putmapping #VS #PatchMapping #SpringMVCAnnotation

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How HTTP PUT and HTTP PATCH update existing data?
As mentioned in our previous tutorial, HTTP PUT is intended for updating a pre-existing item. The way an item is updated through HTTP PUT is by replacing the entire entity with the incoming one. This means that whatever document or unit of data that exists in your system will be completely overridden by the incoming data.

On the other hand, an HTTP PATCH request is meant to patch an existing item. A PATCH request is considered as a list of instructions that are executed to update existing data. This means that only the fields that are included in a PATCH request are updated.

When to use PATCH and PUT
To answer this question, you need to realize that HTTP verbs are only tools among many other tools at your disposal. Having one does not mean that you cannot have the other. However, we can state the following:

PUT is convenient when you need to deal with documents in an “atomic” way. This means that the document that is sent is replaced in its entirety.
PUT is also convenient when you need idempotence. For example, in situations where you are not sure if your PUT request went through to your server or not (for example due to a network issue), you can simply resend the same PUT request, knowing that in the end the result will be the same (it doesn’t matter if your previous request went through or not).
PATCH is convenient when dealing with large documents, for example, if you are modifying an entity that has 30 or more fields. In this case, it does not make sense to send all 30 fields when you only need to modify one. With PATCH, you can send only the fields that need to be modified, saving you some precious computing resources and network bandwidth.

The job of @Controller is to create a Map of the model object and find a view but @RestController simply returns the object and object data is directly written into HTTP response as JSON or XML.
@Controller since Spring 2.5 Officially (3, 3.1) and @RestController Spring 4
@Controller is a common or generic annotation that is used to mark a class as Spring MVC Controller (web controller) while @RestController is a special controller used in RestFull Webservice API and the equivalent of
@RestController = @Controller + @ResponseBody
@Controller is a stereotype annotation or it’s specialization of @Component annotation, while @RestController is a specialization of @Controller annotation
@RestController and @Controller is that you don't need to use @ResponseBody on every handler method once you annotate the class with @RestController
Controller and @RestCotroller in Spring MVC is that once you mark a class @RestController then every method is written a domain object instead of a view.

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