使用Spring Data JPA实现OneToMany集合的添加和删除操作。

示例实现：

// 定义OneToMany关联的实体类 @Entity public class Parent{

@OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true)
private List children;

public void addChild(Child child){
    this.children.add(child);
    child.setParent(this);
}

public void removeChild(Child child){
    this.children.remove(child);
    child.setParent(null);
}

}

@Entity public class Child{

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "parent_id")
private Parent parent;

// getter and setter are omitted.

}

// 在Controller中添加或删除Child @RestController public class ChildController {

@Autowired
private ParentRepository parentRepository;

@PostMapping("/parent/{parentId}/child")
public Child addChild(@RequestBody Child child, @PathVariable Long parentId){
    Parent parent = parentRepository.getOne(parentId);
    parent.addChild(child);
    return child;

}

@DeleteMapping("/parent/{parentId}/child/{childId}")
public void removeChild(@PathVariable Long parentId, @PathVariable Long childId){
    Parent parent = parentRepository.getOne(parentId);
    Child child = parent.getChildren().stream()
        .filter(c -> c.getId().equals(childId))
        .findAny().orElseThrow();
    parent.removeChild(child);
}

}

// ParentRepository public interface ParentRepository extends JpaRepository { }