springmvc编写 部门增删改查 请求 POST http://localhost:8080/depts Body: { "name":"人事部", "user":"负责人张三" } 响应 success

在Spring MVC中编写部门（dept）的增删改查操作，通常会涉及以下几个步骤：

1. **创建实体类（Department）**:

public class Department {
    private String name;
    private String responsiblePerson;

    // getters and setters
}

2. **数据访问层（DAO）**:

public interface DepartmentDAO {
    void create(Department department);
    void update(Department department);
    void delete(String id);
    Department findById(String id);
}

3. **服务层（Service）**:

@Service
public class DepartmentService {
    @Autowired
    private DepartmentDAO dao;

    public void addDepartment(Department dept) {
        dao.create(dept);
    }

    public void updateDepartment(Department dept) {
        dao.update(dept);
    }

    public void deleteDepartment(String id) {
        dao.delete(id);
    }

    public Department getDepartmentById(String id) {
        return dao.findById(id);
    }
}

4. **控制器层（Controller）**:

@RestController
@RequestMapping("/depts")
public class DepartmentController {
    @Autowired
    private DepartmentService service;

    @PostMapping
    public ResponseEntity<?> create(@RequestBody Department dept) {
        try {
            service.addDepartment(dept);
            return new ResponseEntity<>("success", HttpStatus.CREATED);
        } catch (Exception e) {
            return new ResponseEntity<>("error", HttpStatus.BAD_REQUEST);
        }
    }

    // ...其他HTTP方法对应 delete、update 和 get
}

5. **处理成功和错误情况**:
- 当请求成功时，返回`"success"`和HTTP状态码`201 Created`（创建资源）
- 如果出现异常，返回适当的错误信息和状态码（如`400 Bad Request`）

使用上述设计，当发送POST请求到`http://localhost:8080/depts`并携带JSON内容`{ "name": "人事部", "user": "负责人张三" }`时，Spring MVC将调用对应的`create`方法添加新的部门。