Spring boot Spring引导接口投影如何返回所需的JSON结构

我使用的是界面投影

public interface Dashboard
{
    public int getProjectID();
    
    // Review table
    List<ReviewRs> getReviews();
    
    // StakeHolder table
    List<SteakHolderRs> getstakeHolders();
    
    interface ReviewRs
    { 
        int getReviewId();
        String getReviewsType();
    }
    
    interface SteakHolderRs
    {
        int getId();
        String getProjectResource();
    }
    
}

我希望JSON看起来像这样

{
    "dashboards": [
        {
            "projectID": 211281,
            
            "reviews":
                {
                    "reviewsType": "Assessment Review",
                    "reviewId": 396
                },
            "stakeHolders": [
                {
                    "id": 468,
                    "projectResource": "Joseph"
                },
                {
                    "id": 644,
                    "projectResource": "Renji"
                }
            ]
        },
        {
            "projectID": 211281,
            
            "reviews":
                {
                    "reviewsType": "HLSD Review",
                    "reviewId": 423
                },
            "stakeHolders": [
                {
                    "id": 468,
                    "projectResource": "Joseph"
                },
                {
                    "id": 644,
                    "projectResource": "Renji"
                }
            ]
        }
    ]
}

审阅对象不再分组在一起，而是根据ReviewType字段分开

回购接口

@Repository
public interface ProjectRepo extends JpaRepository<Project, Integer>
{   
    public List<Dashboard> findAllProjectedBy();
}

---

如何使用接口投影返回所需的JSON结构？

您期望的结构实际上与实体结构不匹配，因此您可以在获取Yes后手动重新构造。我如何重组以匹配我想要的结果？我一直在尝试不同的接口重构，但无法获得预期的结果。我认为直接在接口中是不可能的，您需要获取接口，然后手动在类中重新构造数据。谢谢。您是否有关于如何手动重新构造界面内数据的建议，或者我可以通过谷歌关键词开始学习？为您的预期结构创建一个类（例如：

DashBoardResponse

），并为like

DashBoardResponse convert（Dashboard d，Review r）

创建一个转换器类。然后在

List

上循环，然后对每个

Dashboard

的

List

进行嵌套循环，并调用convert-to-converter方法来获取

Dashboard响应

，然后添加到arraylist中。

@Repository
public interface ProjectRepo extends JpaRepository<Project, Integer>
{   
    public List<Dashboard> findAllProjectedBy();
}

@Entity
@Table(name = "project")
public class Project
{   
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ProjectID")
    private int projectID;
    
    @OneToMany(mappedBy = "h_project", fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true)
    private List<Review> reviews;
    
    @OneToMany(mappedBy = "l_project", fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true)
    private List<StakeHolder> stakeHolders;
    
    //getters and setters removed for brevity
}

@Entity
@Table(name = "review")
public class Review
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "reviewID")
    private int reviewId;
    
    @Column(name = "ReviewsType")
    private String reviewsType;
    
    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
    @JoinColumn(name = "projectId", insertable=false, updatable=false)
    private Project h_project;
    
    //getters and setters removed for brevity
}