问题

以@Autowired方式注入PasswordEncoder对登录密码进行校验，启动时报错如下

Description:Field userService in com.lyx.springboot.controller.UserController required a bean of type 'org.springframework.security.crypto.password.PasswordEncoder' that could not be found.The injection point has the following annotations:- @org.springframework.beans.factory.annotation.Autowired(required=true)Action:Consider defining a bean of type 'org.springframework.security.crypto.password.PasswordEncoder' in your configuration.

 在配置类里已经以@Bean形式声明了PasswordEncoder，但是不生效。

@AutoConfiguration
@EnableConfigurationProperties(SecurityProperties.class)
public class SecurityConfiguration {@Resourceprivate SecurityProperties securityProperties;@Beanpublic PasswordEncoder passwordEncoder() {return new BCryptPasswordEncoder(4);}
}

解决方法 

第一种方法：在启动类里以@Bean声明

@SpringBootApplication(scanBasePackages = "com.lyx.springboot.*")
public class SpringbootApplication {public static void main(String[] args) {SpringApplication.run(SpringbootApplication.class, args);}@Beanpublic PasswordEncoder passwordEncoder() {return new BCryptPasswordEncoder(4);}
}

第二种方法：在应用的代码处创建实例实现PasswordEncoder接口，如我用到的是BCryptPassword

boolean result =  new BCryptPasswordEncoder().matches(userDTO.getPassword(), userLogin.getPassword());