热插拔技术

Author: 曾梓健

myTest/src/main/java/com/hand/MyTestApplication.java

@@ -4,6 +4,7 @@
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
+@EnableRegisterServer
 public class MyTestApplication {
 
 	public static void main(String[] args) {

zzj-spring-boot-stater/src/main/java/com/hand/EnableRegisterServer.java

@@ -0,0 +1,19 @@
+package com.hand;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import com.hand.config.ConfigMarker;
+import org.springframework.context.annotation.Import;
+
+/**
+ * @author zijian.zeng@hand-china.com
+ * @since 2023-01-27
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+@Import(ConfigMarker.class)  // 将某个组件类生成实例，添加到容器中
+public @interface EnableRegisterServer {
+}

zzj-spring-boot-stater/src/main/java/com/hand/config/ConfigMarker.java

@@ -0,0 +1,9 @@
+package com.hand.config;
+
+
+/**
+ * @author zijian.zeng@hand-china.com
+ * @since 2023-01-27
+ */
+public class ConfigMarker {
+}

zzj-spring-boot-stater/src/main/java/com/hand/config/MyAutoConfiguration.java

@@ -1,6 +1,7 @@
 package com.hand.config;
 
 import com.hand.pojo.SimpleBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
@@ -9,6 +10,7 @@
  * @since 2023-01-27
  */
 @Configuration
+@ConditionalOnBean(ConfigMarker.class)  // 上下文中必须存在ConfigMarker  bean，才会让当前自动配置类生效
 public class MyAutoConfiguration {
 
 	static {
@@ -19,5 +21,4 @@ public class MyAutoConfiguration {
 	public SimpleBean simpleBean() {
 		return new SimpleBean();
 	}
-
 }