AuthenticationManager无法注入

在 SpringSecurity4.x 还是可以直接注入的，但是到了 SpringSecurity5.x 后，如果再直接使用 @Autowired 注入，就会报错：

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

Description:

Field authenticationManager in cn.springcloud.book.OAuthConfiguration required a bean of type 'org.springframework.security.authentication.AuthenticationManager' that could not be found.

Action:

Consider defining a bean of type 'org.springframework.security.authentication.AuthenticationManager' in your configuration.

也没有其他什么好方法，就是手动再添加到 IOC 呗，找一个配置类（嫌麻烦直接在启动类上搞）继承 WebSecurityConfigurerAdapter 然后定义：

@Bean(name = BeanIds.AUTHENTICATION_MANAGER)
@Override
public AuthenticationManager authenticationManagerBean() throws Exception {
    return super.authenticationManagerBean();
}

参考：

https://stackoverflow.com/questions/21633555/how-to-inject-authenticationmanager-using-java-configuration-in-a-custom-filter/21639553#21639553
http://springcloud.cn/view/13

NyanMps / SecurityExample

AuthenticationManager无法注入 #3