为 Public 接口添加 Bean

Question

我有一个 Spring 引导应用程序，我正在添加一些我在常规 Spring MVC 应用程序（不是引导）中编写的代码。

当我运行它时，我得到一个错误：

***************************
APPLICATION FAILED TO START
***************************

Description:

Field userService in app.WelcomeController required a bean of type 'com.myorg.account.service.UserService' that could not be found.


Action:

Consider defining a bean of type 'com.myorg.account.service.UserService' in your configuration.

所以我向 UserService 添加了 Qualifier 和 Autowired。完整代码如下。

package com.myorg.account.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Controller;
import com.myorg.account.model.User;

@Controller
@Configuration
public interface UserService {
     @Autowired(required = true)
     @Qualifier(value="UserService")
    @Bean
    void save(User user);

    User findByUsername(String username);
}

在 WelcomeController 上方，我指定了我认为可以解决问题的限定符。

@ComponentScan
@Controller
@Service("UserInterface")
public class WelcomeController {

这里是错误中提到的userService字段。这是来自 WelcomeController.java

 @RequestMapping(value = "/registration", method = RequestMethod.POST)
    public String registration(@ModelAttribute("userForm") User userForm, BindingResult bindingResult, Model model) {
        userValidator.validate(userForm, bindingResult);

        if (bindingResult.hasErrors()) {
            return "registration";
        }

        userService.save(userForm);

        securityService.autologin(userForm.getUsername(), userForm.getPasswordConfirm());

        return "redirect:/welcome";
    }

提前致谢。

Answer 1

您应该将 @Controller 注释添加到接口 UserService 而不是实现 UserService 接口的 class。

删除UserService中的所有注释，只在'WelcomeController'

中留下@Controller

@Controller
public class WelcomeController implements UserService {

为 Public 接口添加 Bean

Add Bean For Public Interface

java

spring

spring-mvc

javabeans

spring-boot