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+注意:
+
+1. 基于spring-boot-dependencies:2.7.7
+2. 首先需要了解[springboot2.7升级](https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.7-Release-Notes)
+   `Changes to Auto-configuration` 以后使用`autoconfigure`进行自动注入
+
+# 启动
+
+我们每次添加` <artifactId>spring-boot-starter-security</artifactId>`
+,启动的时候启动日志会有一条类似
+`Using generated security password: 1db8eb87-e2ee-4c72-88e7-9b85268c4430
+
+This generated password is for development use only. Your security configuration must be updated before running your application in production.`
+
+的日志.找到`UserDetailsServiceAutoConfiguration#InMemoryUserDetailsManager`类,它是springboot自动装配的.
+
+下面这些都是springboot自动装配类,在`spring-boot-autoconfigure-2.7.7.jar`>META-INF>spring>
+org.springframework.boot.autoconfigure.AutoConfiguration.imports中. 这些类就是security的全部了.
+
+```imports
+org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration
+org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration
+org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration
+org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration
+org.springframework.boot.autoconfigure.security.reactive.ReactiveUserDetailsServiceAutoConfiguration
+org.springframework.boot.autoconfigure.security.rsocket.RSocketSecurityAutoConfiguration
+org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration
+..........
+org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration
+org.springframework.boot.autoconfigure.security.oauth2.client.reactive.ReactiveOAuth2ClientAutoConfiguration
+org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration
+org.springframework.boot.autoconfigure.security.oauth2.resource.reactive.ReactiveOAuth2ResourceServerAutoConfiguration
+```
+
+## SecurityAutoConfiguration
+
+```java
+
+/**
+ * {@code EnableAutoConfiguration} for Spring Security.
+ *
+ * @author Dave Syer
+ * @author Andy Wilkinson
+ * @author Madhura Bhave
+ * @since 1.0.0
+ */
+@AutoConfiguration
+@ConditionalOnClass(DefaultAuthenticationEventPublisher.class)
+@EnableConfigurationProperties(SecurityProperties.class)
+@Import({SpringBootWebSecurityConfiguration.class, SecurityDataConfiguration.class})
+public class SecurityAutoConfiguration {
+
+    @Bean
+    @ConditionalOnMissingBean(AuthenticationEventPublisher.class)
+    public DefaultAuthenticationEventPublisher authenticationEventPublisher(ApplicationEventPublisher publisher) {
+        return new DefaultAuthenticationEventPublisher(publisher);
+    }
+
+}
+```
+
+### @EnableConfigurationProperties(SecurityProperties.class)
+
+这个是security的核心配置类`SecurityProperties`,里面能配置
+`filter`: 过滤,`user` : 用户信息
+
+`这个有个问题,filter是属于tomcat的,security中使用什么方式让filter变的有序的`
+
+### @Import({ SpringBootWebSecurityConfiguration.class, SecurityDataConfiguration.class })
+
+这里导入了2个类 `SpringBootWebSecurityConfiguration`和`SecurityDataConfiguration`,`SecurityDataConfiguration`是Spring
+Security与Spring数据的集成,暂时不做讲解,重点是`SpringBootWebSecurityConfiguration`
+
+#### SpringBootWebSecurityConfiguration
+
+##### SecurityFilterChainConfiguration
+
+其中第一个子类`SecurityFilterChainConfiguration`添加了`@ConditionalOnDefaultWebSecurity`,这个类有个注解
+`@Conditional(DefaultWebSecurityCondition.class)`,而`DefaultWebSecurityCondition`类继承了`AllNestedConditions`
+
+所以下面代码就是判断该类是否生效,如果不存在`SecurityFilterChain`和`WebSecurityConfigurerAdapter`
+的bean,就生效.创建默认的`SecurityFilterChain`
+
+```java
+/**
+ * {@link Condition} for
+ * {@link ConditionalOnDefaultWebSecurity @ConditionalOnDefaultWebSecurity}.
+ *
+ * @author Phillip Webb
+ */
+class DefaultWebSecurityCondition extends AllNestedConditions {
+
+    DefaultWebSecurityCondition() {
+        super(ConfigurationPhase.REGISTER_BEAN);
+    }
+
+    @ConditionalOnClass({SecurityFilterChain.class, HttpSecurity.class})
+    static class Classes {
+
+    }
+
+    @ConditionalOnMissingBean({
+            org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter.class,
+            SecurityFilterChain.class})
+    @SuppressWarnings("deprecation")
+    static class Beans {
+
+    }
+
+}
+```
+
+
+
+##### ErrorPageSecurityFilterConfiguration
+
+这是第二个子类,主要就是通过`FilterRegistrationBean`注入了一个`ErrorPageSecurityFilter`.    用于拦截错误调度，以确保对错误页面的授权访问。
+ 
+
+##### WebSecurityEnablerConfiguration
+这个类主要就是添加了`@EnableWebSecurity`注解,这个注解也很重要,后面跟`SecurityFilterChain`一样讲解
+
+
+### DefaultAuthenticationEventPublisher
+在类中还存在`SecurityAutoConfiguration`bean,这个是属于spring的发布订阅.改装一下,就是security的成功和失败事件,可以订阅失败后的一些处理,如日志打印等
+
+
+```java
+/**
+ * @author Luke Taylor
+ * @since 3.0
+ */
+public interface AuthenticationEventPublisher {
+
+	void publishAuthenticationSuccess(Authentication authentication);
+
+	void publishAuthenticationFailure(AuthenticationException exception, Authentication authentication);
+
+}
+```
+
+## UserDetailsServiceAutoConfiguration
+
+## SecurityFilterAutoConfiguration
+
+
+
+