Java 创建名为employeeController的bean时出错。自动连接依赖项的注入失败。无法自动关联字段

控制台出错

 SEVERE: Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeController': Injection of autowired dependencies failed;
  nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.ram.service.EmployeeService com.ram.controller.EmployeeController.employeeService; 
  nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeService': Injection of autowired dependencies failed;
  nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.ram.dao.EmployeeDao com.ram.service.EmployeeServiceImpl.employeeDao;
  nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeDao': Injection of autowired dependencies failed;

EmployeeController.java

@Controller
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @Qualifier(value="employeeService")
    public void setEmployeeService(EmployeeService employeeService){
        this.employeeService = employeeService;
    }

    @RequestMapping(value = "/employees", method = RequestMethod.GET)
    public String listEmployee(Model model) {
        model.addAttribute("employee", new Employee());
        model.addAttribute("listEmployee", employeeService.listEmployee());
        return "employee";
    }

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这一行是日志中最重要的一行。不幸的是，日志不完整，因此不清楚

EmployeeDao

的哪个属性缺失：

nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeDao': Injection of autowired dependencies failed;

---

您将哪些字段映射到

EmployeeDao

？由于其中一个无法找到，可能没有标记为

@Component

？

问题是由

employeeService

bean引起的，Spring的实例化失败，因为没有使用

EmployeeDao

类声明bean。您应该显示

EmployeeService

和

EmployeeDao

类，以及可能使用的Spring配置。可能您在EmployeeService和EmployeeDao中缺少@Component注释，以便让Spring知道它们。我使用了@Repository for employeeDaoImplNo，而不是

EmployeeDaoImpl

。。。在任何

employeedaimpl

autowires的内容上。它需要什么？你能把这门课加到你的问题里吗？