我是第一次使用JacksonAPI。我创建了一个spring Boot 应用程序，并尝试更改JSON字符串的键。

package com.poc.entity;

import com.fasterxml.jackson.annotation.JsonProperty;

public class Employee {
    @JsonProperty("employeeId")
    private Integer id;
    @JsonProperty("employeeName")
    private String name;
}
--------------------------------
package com.poc.controller;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.poc.entity.Employee;

@RestController
@RequestMapping("/emp")
public class EmployeeController {
    @GetMapping
    public ResponseEntity<Employee> get() throws JsonMappingException, JsonProcessingException {
        String json = "{ \"employeeId\" : \"123\", \"employeeName\" : \"John Smith\" }";
        ObjectMapper mapper = new ObjectMapper();
        Employee employee = mapper.readValue(json, Employee.class);
        return new ResponseEntity<Employee>(employee, HttpStatus.OK);
    }
}

预期结果：{“id”：123，“name”：“John Smith”}
但它给予：{“employeeId”：123，“employeeName”：“John Smith”}
请帮我修理一下。提前感谢您的帮助。