请求406错误

在controller中定义了一个固定格式的返回类，但是没有写get,set方法，只有私有字段

public class R <T>{

    private Integer code;
    private String msg;
    private  T data;

    public static<T> R<T> success(T o){
       R<T> r=new R<T>();
       r.code=1;
       r.msg="";
       r.data=o;
       return  r;
    }

    public  static<T> R<T> error(String str){
        R r=new R();
        r.code=0;
        r.msg=str;
        return  r;
    }

}

在controller 返回时候一直报错406状态码错误，实际原因是因为只有私有字段，所以无法被序列化返回，所以报错了

@Slf4j
@RequestMapping("/employee")
@RestController
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @PostMapping("/login")
    public R<Employee> login(HttpServletRequest request,@RequestBody  Employee em){
       String password=  DigestUtils.md5DigestAsHex(em.getPassword().getBytes());
       String username=em.getUsername();
        LambdaQueryWrapper<Employee> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(Employee::getUsername,username);
        Employee employee=employeeService.getOne(queryWrapper);
        if (employee==null){
           return R.error("用户不存在");
        }

        if (!password.equals(employee.getPassword())){
            return  R.error("密码错误");
        }

        request.getSession().setAttribute("employee",employee.getId());
        return  R.success(employee);

    }
}

解决方法：

 第一种： 返回的类R中添加getter,setter方法

public class R <T>{

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    private Integer code;
    private String msg;
    private  T data;

    public static<T> R<T> success(T o){
       R<T> r=new R<T>();
       r.code=1;
       r.msg="";
       r.data=o;
       return  r;
    }

    public  static<T> R<T> error(String str){
        R r=new R();
        r.code=0;
        r.msg=str;
        return  r;
    }

}

第二种方法： 

   使用@Data注解，这样自动装配了getter,setter方法

  

@Data
public class R <T>{
    
    private Integer code;
    private String msg;
    private  T data;

    public static<T> R<T> success(T o){
       R<T> r=new R<T>();
       r.code=1;
       r.msg="";
       r.data=o;
       return  r;
    }

    public  static<T> R<T> error(String str){
        R r=new R();
        r.code=0;
        r.msg=str;
        return  r;
    }

}