无法在RestController中使用@DeleteMapping绑定ID以从列表中删除项目

Question

我正在尝试获取此列表中的数据以使用邮递员处理删除请求：

我已创建此列表：

@Service
public class SchoolService {

    private List<School> SchoolLists = new ArrayList<School>();

    public SchoolService() {
        System.out.println("Service School is created");

        SchoolLists.add(new School(1, "The white hands Group");

        SchoolLists.add(new School(2,"The Yellow Hands"));

在这里，我试图通过id从列表中删除一个元素：

public void deleteSchool(Integer id){
        SchoolLists.remove(id);

        throw new RuntimeException("School not found for given ID = " + id);
    }

这是我在RestController中处理删除请求的方式：

@RestController
public class SchoolController {

@Autowired
private SchoolService schoolService;

@DeleteMapping("/school/{id}")
    public void deleteSchool(@PathVariable Integer id )
    {
        SchoolService.deleteSchool(id);
    }

这是我在邮递员中遇到的错误：enter image description here

这是删除异常后出现的错误：

enter image description here

Answer 1

您可以尝试使用@PostConstruct批注（请参见the official reference）

@Service
public class SchoolService {

    private List<School> SchoolLists = new CopyOnWriteArrayList<School>();

    @PostConstruct
    public init() {
        System.out.println("Service School is created");

        SchoolLists.add(new School(1, "The white hands Group");

        SchoolLists.add(new School(2,"The Yellow Hands"));

使用CopyOnWriteArrayList来确保线程安全支持。