diff --git "a/springboot-source-code-analysis/(4)347円263円273円347円273円237円345円210円235円345円247円213円345円214円226円345円231円250円350円247円243円346円236円220円.md" "b/springboot-source-code-analysis/(4)347円263円273円347円273円237円345円210円235円345円247円213円345円214円226円345円231円250円350円247円243円346円236円220円.md"
index 8e82986..b293a0e 100644
--- "a/springboot-source-code-analysis/(4)347円263円273円347円273円237円345円210円235円345円247円213円345円214円226円345円231円250円350円247円243円346円236円220円.md"
+++ "b/springboot-source-code-analysis/(4)347円263円273円347円273円237円345円210円235円345円247円213円345円214円226円345円231円250円350円247円243円346円236円220円.md"
@@ -208,3 +208,8 @@ public ConfigurableApplicationContext run(String... args) {
 
 
 
+
+
+#### 5、推荐使用的系统初始化器【调用机制】
+
+image-20210803143602922
\ No newline at end of file
diff --git "a/springboot-source-code-analysis/(5)347円233円221円345円220円254円345円231円250円350円256円276円350円256円241円346円250円241円345円274円217円.md" "b/springboot-source-code-analysis/(5)347円233円221円345円220円254円345円231円250円350円256円276円350円256円241円346円250円241円345円274円217円.md"
new file mode 100644
index 0000000..e283287
--- /dev/null
+++ "b/springboot-source-code-analysis/(5)347円233円221円345円220円254円345円231円250円350円256円276円350円256円241円346円250円241円345円274円217円.md"
@@ -0,0 +1,187 @@
+## 监听器
+
+### 1、监听器模式介绍
+
+image-20210803144505140
+
+- 系统消息由广播器(Multicaster)发布出去,发布的内容统称为事件(Event),对关键事件产生订阅的是监听器(Listener);
+
+
+
+### 2、自定义事件-创建事件
+
+- 创建天气事件抽象类
+
+ ```java
+ // 天气事件抽象类
+ public abstract class WeatherEvent {
+ // 获取当前天气的事件
+ public abstract String getWeather();
+ }
+ ```
+
+- 创建下雨事件实现类
+
+ ```java
+ // 下雨事件
+ public class RainEvent extends WeatherEvent {
+ @Override
+ public String getWeather() {
+ return "rain";
+ }
+ }
+ ```
+
+- 创建下雪事件实现类
+
+ ```java
+ // 下雪事件
+ public class SnowEvent extends WeatherEvent {
+ @Override
+ public String getWeather() {
+ return "snow";
+ }
+ }
+ ```
+
+ 
+
+#### 3、自定义事件监听器-创建监听器
+
+- 创建天气事件监听器接口类
+
+ ```java
+ // 天气监听器
+ public interface WeatherListener {
+ // 监听天气事件
+ void onWeatherEvent(WeatherEvent event);
+ }
+ ```
+
+- 创建下雨事件监听器实现类
+
+ ```java
+ // 下雨监听器
+ public class RainListener implements WeatherListener {
+ @Override
+ public void onWeatherEvent(WeatherEvent event) {
+ if (event instanceof RainEvent) {
+ System.out.println("rain event ..." + event.getWeather());
+ }
+ }
+ }
+ ```
+
+- 创建下雪事件监听器实现类
+
+ ```java
+ // 下雪监听器
+ public class SnowListener implements WeatherListener {
+ @Override
+ public void onWeatherEvent(WeatherEvent event) {
+ if (event instanceof SnowEvent) {
+ System.out.println("snow event.." + event.getWeather());
+ }
+ }
+ }
+ ```
+
+ 
+
+#### 4、自定义事件广播器-创建事件广播器
+
+- 创建事件广播器接口
+
+ ```java
+ // 事件广播器
+ public interface EventMulticaster {
+ // 广播事件
+ void multicastEvent(WeatherEvent event);
+ // 添加监听器
+ void addListener(WeatherListener listener);
+ // 删除监听器
+ void removeListener(WeatherListener listener);
+ }
+
+- 创建事件广播器的抽象类
+
+ ```java
+ 
+ // 抽象的事件广播器
+ public abstract class AbstractEventMulticaster implements EventMulticaster {
+ // 事件监听器列表
+ private List<weatherlistener> listenerList = new CopyOnWriteArrayList<strong>();
+ 
+ @Override
+ public void multicastEvent(WeatherEvent event) {
+ // 广播所有事件监听器
+ listenerList.forEach(listener -> {
+ // 触发前-模版方法
+ doStart();
+ // 触发机制
+ listener.onWeatherEvent(event);
+ // 触发后-模版方法
+ doEnd();
+ });
+ }
+ 
+ // 添加事件监听器
+ @Override
+ public void addListener(WeatherListener listener) {
+ listenerList.add(listener);
+ }
+ 
+ // 删除事件监听器
+ @Override
+ public void removeListener(WeatherListener listener) {
+ listenerList.remove(listener);
+ }
+ 
+ // 模版方法
+ abstract void doStart();
+ abstract void doEnd();
+ }
+ ```
+
+- 创建事件广播器的实现类
+
+ ```java
+ // 天气事件广播器
+ public class WeatherEventMulticaster extends AbstractEventMulticaster {
+ @Override
+ public void doStart() {
+ System.out.println("multicaster event begin ...");
+ }
+ @Override
+ public void doEnd() {
+ System.out.println("multicaster evnet end ....");
+ }
+ }
+ ```
+
+ 
+
+#### 5、测试
+
+```java
+public class Test {
+
+ public static void main(String[] args) {
+ // 创建事件广播器
+ WeatherEventMulticaster multicaster = new WeatherEventMulticaster();
+
+ // 添加事件监听器
+ WeatherListener listener1 = new SnowListener();
+ WeatherListener listener2 = new RainListener();
+ multicaster.addListener(listener1);
+ multicaster.addListener(listener2);
+
+ // 广播事件
+ WeatherEvent event1 = new RainEvent();
+ WeatherEvent event2 = new SnowEvent();
+ multicaster.multicastEvent(event1);
+ multicaster.multicastEvent(event2);
+ }
+}
+```
+
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/AbstractEventMulticaster.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/AbstractEventMulticaster.java
new file mode 100644
index 0000000..bd5dbb9
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/AbstractEventMulticaster.java
@@ -0,0 +1,50 @@
+package com.example.springboot.source.code.analysis.event;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 3:20 下午
+ */
+
+
+// 抽象的事件广播器
+public abstract class AbstractEventMulticaster implements EventMulticaster {
+
+ // 事件监听器列表
+ private List<weatherlistener> listenerList = new CopyOnWriteArrayList<strong>();
+
+ @Override
+ public void multicastEvent(WeatherEvent event) {
+ // 广播所有事件监听器
+ listenerList.forEach(listener -> {
+ doStart();
+ // 触发
+ listener.onWeatherEvent(event);
+ doEnd();
+ });
+ }
+
+ // 添加事件监听器
+ @Override
+ public void addListener(WeatherListener listener) {
+ listenerList.add(listener);
+ }
+
+ // 删除事件监听器
+ @Override
+ public void removeListener(WeatherListener listener) {
+ listenerList.remove(listener);
+ }
+
+
+ // 模版方法
+ abstract void doStart();
+
+ abstract void doEnd();
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/EventMulticaster.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/EventMulticaster.java
new file mode 100644
index 0000000..e94fc66
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/EventMulticaster.java
@@ -0,0 +1,23 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 3:04 下午
+ */
+
+// 事件广播器
+public interface EventMulticaster {
+
+ // 广播事件
+ void multicastEvent(WeatherEvent event);
+
+ // 添加监听器
+ void addListener(WeatherListener listener);
+
+ // 删除监听器
+ void removeListener(WeatherListener listener);
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/RainEvent.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/RainEvent.java
new file mode 100644
index 0000000..a6f127e
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/RainEvent.java
@@ -0,0 +1,19 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 2:52 下午
+ */
+
+// 下雨事件
+public class RainEvent extends WeatherEvent {
+
+ @Override
+ public String getWeather() {
+ return "rain";
+ }
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/RainListener.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/RainListener.java
new file mode 100644
index 0000000..d7e72bf
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/RainListener.java
@@ -0,0 +1,22 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 3:00 下午
+ */
+
+
+// 下雨监听器
+public class RainListener implements WeatherListener {
+
+ @Override
+ public void onWeatherEvent(WeatherEvent event) {
+ if (event instanceof RainEvent) {
+ System.out.println("rain event ..." + event.getWeather());
+ }
+ }
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/SnowEvent.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/SnowEvent.java
new file mode 100644
index 0000000..c12c5ca
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/SnowEvent.java
@@ -0,0 +1,19 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 2:51 下午
+ */
+
+// 下雪事件
+public class SnowEvent extends WeatherEvent {
+
+ @Override
+ public String getWeather() {
+ return "snow";
+ }
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/SnowListener.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/SnowListener.java
new file mode 100644
index 0000000..2f01f4f
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/SnowListener.java
@@ -0,0 +1,21 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 3:02 下午
+ */
+
+// 下雪监听器
+public class SnowListener implements WeatherListener {
+
+ @Override
+ public void onWeatherEvent(WeatherEvent event) {
+ if (event instanceof SnowEvent) {
+ System.out.println("snow event.." + event.getWeather());
+ }
+ }
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/Test.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/Test.java
new file mode 100644
index 0000000..0aca9cc
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/Test.java
@@ -0,0 +1,32 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 3:29 下午
+ */
+
+
+public class Test {
+
+ public static void main(String[] args) {
+ // 创建事件广播器
+ WeatherEventMulticaster multicaster = new WeatherEventMulticaster();
+
+ // 添加事件监听器
+ WeatherListener listener1 = new SnowListener();
+ WeatherListener listener2 = new RainListener();
+ multicaster.addListener(listener1);
+ multicaster.addListener(listener2);
+
+ // 广播事件
+ WeatherEvent event1 = new RainEvent();
+ WeatherEvent event2 = new SnowEvent();
+ multicaster.multicastEvent(event1);
+ multicaster.multicastEvent(event2);
+ }
+
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherEvent.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherEvent.java
new file mode 100644
index 0000000..ad2b98b
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherEvent.java
@@ -0,0 +1,18 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 2:50 下午
+ */
+
+
+// 天气事件抽象类
+public abstract class WeatherEvent {
+
+ // 获取当前天气的事件
+ public abstract String getWeather();
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherEventMulticaster.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherEventMulticaster.java
new file mode 100644
index 0000000..642736b
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherEventMulticaster.java
@@ -0,0 +1,24 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 3:27 下午
+ */
+
+// 天气事件广播器
+public class WeatherEventMulticaster extends AbstractEventMulticaster {
+
+ @Override
+ public void doStart() {
+ System.out.println("multicaster event begin ...");
+ }
+
+ @Override
+ public void doEnd() {
+ System.out.println("multicaster evnet end ....");
+ }
+}
diff --git a/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherListener.java b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherListener.java
new file mode 100644
index 0000000..ff237ce
--- /dev/null
+++ b/springboot-source-code-analysis/src/main/java/com/example/springboot/source/code/analysis/event/WeatherListener.java
@@ -0,0 +1,17 @@
+package com.example.springboot.source.code.analysis.event;
+
+/**
+ * Created by ipipman on 2021年8月3日.
+ *
+ * @version V1.0
+ * @Package com.example.springboot.source.code.analysis.event
+ * @Description: (用一句话描述该文件做什么)
+ * @date 2021年8月3日 2:58 下午
+ */
+
+// 天气监听器
+public interface WeatherListener {
+
+ // 监听天气事件
+ void onWeatherEvent(WeatherEvent event);
+}
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