In order to save a new object like i.e a User object:

class User {

private String name;
private String email;

}

Should I ask my client to submit a @RequestBody like this:

{
"name":"Josh",
"email":"[email protected]"
}

Or maybe should just ask for some @RequestParams like this:

/api/user?name=Josh&&email=josh@kmail.com

And create a method that builds the object from these params? I am dealing with some complex objects in my project if it has anything to do with my question.

Thanks your help.

CodePudding user response：

Spring MVC has 2 annotations to handle mapping to an object.

• @RequestBody to map a request payload to an object.
• @ModelAttribute to map request parameters (automatically) to an object.

So actually both can automatically map to your User object.

@PostMapping
public User register(@RequestBody User user) {}

or

@PostMapping
public User register(@ModelAttribute User user) {}

The first will use the payload, the second will use the request parameters to create the User object. So both will work, but serve different use cases.

CodePudding user response：

Both your approaches would work - but the standard way is definitely using:

POST @RequestBody JSON of { user } to /users

GET would technically work - but using the HTTP method GET implies that the action is idempotent, meaning it will not change the underlying data (from the client's viewpoint) - and this is almost certainly not the case when creating a new User.

In addition, the current User object is simple enough to be represented by query string parameters - but that may change in the future, when a User could contain various contact information such as addresses.

CodePudding user response：

@RequestBody annotation automatically deserializes the JSON data encapsulated in the request body into a particular model object. example:

@PostMapping("/create")
@ResponseBody
public Product createProduct(@RequestBody Product product) {
// custom logic
return product;
}

unlike @RequestBody, the @RequestParam annotation supports only simple data types such as int and String.