Parse JSON payload in Spring MVC

Question

I started studied web service recently with Spring and I would like to know how to parse String into JSON. My web service allow the Motus game so a player have to find a word and has 5 attempts to do it.

I would like to post the word chose by the users into the request body of the HTTP request.

@PostMapping(value = "/jouer")
public void plays(@RequestBody String name){
   users.plays(name);
}

The JSON in the body would be like this:

{
  "name": "elephant"
}

I wouldn't like to create classes to map the JSON.

cassiomolin · Accepted Answer · 2019-03-21 15:20:57Z

I wouldn't like to create classes to map the JSON.

I would advise you to create a class anyways. But, if you want to avoid it, you could use a Map<String, String>, as shown below:

@PostMapping(value = "/jouer")
public void plays(@RequestBody Map<String, String> payload) {
    String name = payload.get("name");
}

If you go for the class approach, you would have something like:

@Data
public class GuessAttempt {
    private String name;
}

@PostMapping(value = "/jouer")
public void plays(@RequestBody GuessAttempt payload) {
    String name = payload.getName();
}

The @Data annotation is from Lombok: It generates all the boilerplate code that is normally associated with simple beans:

Getters for all fields;
Setters for all non-final fields;
Appropriate toString(), equals() and hashCode() methods;
Constructor that initializes all final fields.

If you don't use Lombok, simply implement those methods manually.

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