没有类型为“testgroup”的合格bean。私人诊所。刀。“PatientDAO”在SpringBoot应用程序中可用

Question

我正在开发crud应用程序，在使用springboot时遇到了困难，它在启动时失败。这就是我得到的：

20764警告[main]——组织。springframework。上下文注释。AnnotationConfigApplicationContext:上下文初始化期间遇到异常-取消刷新尝试：org。springframework。豆。工厂UnsatifiedPendencyException:创建名为“patientServiceImpl”的bean时出错：通过方法“setPatientDAO”参数0表示的未满足的依赖关系；嵌套的异常是org。springframework。豆。工厂NoSuchBeanDefinitionException:没有类型为“testgroup”的合格bean。私人诊所。刀。PatientDAO'可用：至少需要1个符合autowire候选资格的bean。依赖项批注：{}

型号：

package testgroup.private_clinic.model;

import javax.persistence.*;

@Entity
@Table(name="Patients")
public class Patient {

    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    int id;
    @Column(name="patient_name")
    String name;
    @Column(name = "patient_surname")
    String surname;
    @Column(name = "patient_patronimic")
    String patronimic;
    @Column(name="adress")
    String adress;
    @Column(name = "status")
    String status;
    @Column(name="diagnosis")
    String diagnosis;

//+getters and setters

控制器：

package testgroup.private_clinic.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;
import testgroup.private_clinic.model.Patient;
import testgroup.private_clinic.service.PatientService;

import java.util.List;

@RestController
public class PatientController {

    PatientService patientService;

    @Autowired
    public void setPatientService(PatientService patientService){
        this.patientService = patientService;
    }

    @RequestMapping(method = RequestMethod.GET)
    public ModelAndView allPatients(){
        List<Patient> patients = patientService.allPatients();
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("patients");
        modelAndView.addObject("patientList", patients);
        return modelAndView;
    }

    @RequestMapping(value= "/edit{id}", method = RequestMethod.GET)
    public ModelAndView editPage(@PathVariable("id") int id){
        Patient patient = patientService.getByID(id);
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("editPage");
        modelAndView.addObject("patient", patient);
        return modelAndView;
    }

    @RequestMapping(value="/edit", method = RequestMethod.POST)
    public ModelAndView editPatient(@ModelAttribute("patient") Patient patient){
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("redirect:/");
        patientService.edit(patient);
        return modelAndView;
    }
}

仓库：

package testgroup.private_clinic.dao;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import testgroup.private_clinic.model.Patient;

import javax.transaction.Transactional;
import java.util.*;


@Repository
public class PatientDAOImpl implements PatientDAO {

    SessionFactory sessionFactory;

    @Autowired
    public void setSessionFactory(SessionFactory sessionFactory){
        this.sessionFactory = sessionFactory;
    }

    @Override
    @Transactional
    public List<Patient> allPatients() {
        Session session = sessionFactory.getCurrentSession();
        return session.createQuery("from Patient").list();
    }

    @Override
    @Transactional
    public void add(Patient patient) {
        Session session = sessionFactory.getCurrentSession();
        session.persist(patient);
    }

    @Override
    @Transactional
    public void delete(Patient patient) {
        Session session = sessionFactory.getCurrentSession();
        session.delete(patient);
    }

    @Override
    @Transactional
    public void edit(Patient patient) {
        Session session = sessionFactory.getCurrentSession();
        session.update(patient);
    }

    @Override
    @Transactional
    public Patient getByID(int id) {
        Session session = sessionFactory.getCurrentSession();
        return session.get(Patient.class, id);
    }
}

服务：

package testgroup.private_clinic.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import testgroup.private_clinic.model.Patient;
import testgroup.private_clinic.dao.PatientDAO;

import javax.transaction.Transactional;
import java.util.List;

@Service
public class PatientServiceImpl implements PatientService{

    PatientDAO patientDAO;

    @Autowired
    public void setPatientDAO(PatientDAO patientDAO){
        this.patientDAO = patientDAO;
    }


    @Transactional
    @Override
    public List<Patient> allPatients() {
        return patientDAO.allPatients();
    }

    @Transactional
    @Override
    public void add(Patient patient) {
        patientDAO.add(patient);

    }

    @Transactional
    @Override
    public void delete(Patient patient) {
        patientDAO.delete(patient);
    }

    @Transactional
    @Override
    public void edit(Patient patient) {
        patientDAO.edit(patient);
    }

    @Transactional
    @Override
    public Patient getByID(int id) {
        return patientDAO.getByID(id);
    }
}

主要类：

package testgroup.private_clinic.service;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;




@SpringBootApplication
public class SpringBootClass {
    public static  void main(String[] args){
        SpringApplication.run(testgroup.private_clinic.service.SpringBootClass.class, args);
    }
}

Answer 1

SpringBoot使用类路径组件扫描意味着，入口点类SpringBootClass将扫描其类路径中的所有bean，除非您将其配置为不扫描。

查看您的项目结构，SpringBootClass在testgroup.private_clinic.service包下，因此Spring Boot只会扫描这个包以查找bean，并且它只找到了患者服务Impl，但是在它将其注入应用程序上下文之前，它需要首先注入它的依赖患者DAO，这不是testgroup.private_clinic.service包的一部分，因此，解释了您的错误。

你有两个选项来解决这个问题：

>

将SpringBootClass移动到基本包testgroup。private_clinic-这将对该包及其子包（例如，服务、dao）下的所有组件进行Spring Boot扫描

在SpringBootClass上使用@ComponentScan，并在那里定义要扫描bean的基本包。

@ComponentScan（basPackages="testgroup.private_clinic"）

谢谢，干杯！