如何将 @RequestParam 与嵌套对象一起使用

Question

我需要将来自 JSON 的二维数组转换为字符串。我只需要操纵这个值。

有一个 JSON 示例：

https://en.wikipedia.org/wiki/GeoJSON

@RequestMapping 是操作来自 REST 的值的方法。但我不知道如何对嵌套对象执行此操作。

    @ResponseBody
    public GeoJson saveData(@RequestParam {What i need}...) throws IOException{
        return geoJSONRepository.save(geoJson);
    }

GeoJson 类：

@Entity
public class GeoJson {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    private String type;
    @OneToMany(cascade = CascadeType.ALL)
    @ToString.Exclude
    private List<Feature> features = new ArrayList<Feature>();
    public GeoJson() {
    }
}

要素类：

@Entity
public class Feature {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long fId;
    private String type;
    @OneToOne(cascade = CascadeType.ALL)
    private Properties properties;
    @OneToOne(cascade = CascadeType.ALL)
    private Geometry geometry;
}

属性类：

@Entity
public class Properties {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "pId", nullable = false)
    private Long pId;
    @Column(name = "property_type")
    private String type;
}

几何类：

@Entity
public class Geometry {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "gId", nullable = false)
    private Long gId;
    private String type;
    private String coordinates; //2-d coordinates value

}