Answer:

𝐑𝐞𝐬𝐩𝐨𝐧𝐬𝐞𝐁𝐨𝐝𝐲 annotation is a step further from a classic MVC approach to a REST approach

when 𝐕𝐢𝐞𝐰𝐑𝐞𝐬𝐨𝐥𝐯𝐞𝐫 is not needed and request-handler result might be directly written to the http-response body.

𝐑𝐞𝐬𝐩𝐨𝐧𝐬𝐞𝐁𝐨𝐝𝐲 annotation does exactly that, enabling functionality offered by 𝐇𝐭𝐭𝐩𝐌𝐞𝐬𝐬𝐚𝐠𝐞𝐂𝐨𝐧𝐯𝐞𝐫𝐭𝐞𝐫 message-converters.

Note: 𝐑𝐞𝐬𝐩𝐨𝐧𝐬𝐞𝐁𝐨𝐝𝐲 annotation might be applied at a type level,

thus all handler methods declared within that type will inherit declared behavior.

The @ResponseBody annotation tells a controller that the object returned is automatically serialized into JSON and passed back into the HttpResponse object.

Suppose we have a custom Response object:

Next, the associated controller can be implemented:

In the developer console of our browser or using a tool like Postman, we can see the following response:

{"𝐭𝐞𝐱𝐭":"𝐓𝐡𝐚𝐧𝐤𝐬 𝐅𝐨𝐫 𝐏𝐨𝐬𝐭𝐢𝐧𝐠!!!"}

Remember, we don't need to annotate the @RestController-annotated controllers with the @ResponseBody annotation since Spring does it by default.

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@ResponseBody 👉 https://www.baeldung.com/spring-request-response-body#requestbody