如何在spring boot中重命名json对象(变量)名称

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

public class User {
    private String username;

    // Getter and Setter for username

    @JsonProperty("fullName")
    public String getUsername() {
        return username;
    }

    @JsonProperty("fullName")
    public void setUsername(String username) {
        this.username = username;
    }
}

@RestController
public class UserController {

    @GetMapping("/user")
    public User getUser() {
        User user = new User();
        user.setUsername("John Doe");
        return user;
    }

    @PostMapping("/user")
    public void createUser(@RequestBody User user) {
        // Process the user object
    }
}