在 Spring Boot 中通过构造函数表达的不满足依赖关系

Question

大家好，我的 springboot 版本是'2.2.4.RELEASE'。
我想在构造函数中自动装配 2 个参数。但它不起作用。
Mabye 我认为 'passwordEncoder' 有问题...

这是 'UserService.java' 代码。

import kr.co.loosie.foody.domain.User;
import kr.co.loosie.foody.domain.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;

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



@Service
@Transactional
public class UserService {

private UserRepository userRepository;
private PasswordEncoder passwordEncoder;


@Autowired
public UserService(UserRepository userRepository,
                   PasswordEncoder passwordEncoder) {
    this.userRepository = userRepository;
    this.passwordEncoder = passwordEncoder;
}

public User registerUser(String email, String name, String password) {
    Optional<User> existed = userRepository.findByEmail(email);
    if (existed.isPresent()) {
        throw new EmailExistedException(email);
    }

    String encodedPassword = passwordEncoder.encode(password);

    User user = User.builder()
            .email(email)
            .name(name)
            .password(encodedPassword)
            .level(1L)
            .build();
    return userRepository.save(user);
}



public User authenticate(String email, String password) {
    User user = userRepository.findByEmail(email)
            .orElseThrow(() -> new EmailNotExistedException(email));

    if (!passwordEncoder.matches(password, user.getPassword())) {
        throw new PasswordWrongException();
    }

    return user;
  }
 }

错误部分在这里
@Autowired
public UserService(UserRepository userRepository,
密码编码器密码编码器）{
this.userRepository = 用户资料库；
this.passwordEncoder = 密码编码器；
}

当我只使用 UserReposiotory 进行自动装配时它起作用了
但是我放了 PasswordEncoder passwordEncoder 行，它没有用。请给我一些帮助！

这是警告信息

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with         
name 'userService' defined in file [D:\CCC\intellij_ex\foody\foody-customer- 
api\build\classes\java\main\kr\co\loosie\foody\application\UserService.class]: Unsatisfied dependency 
expressed through constructor parameter 1; nested exception is 
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 
'org.springframework.security.crypto.password.PasswordEncoder' available: expected at least 1 bean 
which qualifies as autowire candidate. Dependency annotations: {}

请帮帮我！

Answer 1

错误消息显示 org.springframework.security.crypto.password.PasswordEncoder 没有 bean，这意味着您没有在任何地方定义它。

你需要这样的东西：

@Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

在您的配置中（如果通过 Java 配置）

在 Spring Boot 中通过构造函数表达的不满足依赖关系

Unsatisfied dependency expressed through constructor in SpringBoot

java

service

spring

autowired

spring-boot