新增spring-annotation-lazy

spring-annotation/pom.xml

@@ -19,6 +19,7 @@
         <module>spring-annotation-propertySource</module>
         <module>spring-annotation-componentScan</module>
         <module>spring-annotation-dependsOn</module>
+        <module>spring-annotation-lazy</module>
     </modules>
 
 </project>

spring-annotation/spring-annotation-lazy/pom.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>spring-annotation</artifactId>
+        <groupId>com.xcs.spring</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>spring-annotation-lazy</artifactId>
+
+</project>

spring-annotation/spring-annotation-lazy/src/main/java/com/xcs/spring/LazyApplication.java

@@ -0,0 +1,25 @@
+package com.xcs.spring;
+
+import com.xcs.spring.config.MyConfiguration;
+import com.xcs.spring.service.MyService;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+/**
+ * @author xcs
+ * @date 2023年08月07日 16时21分
+ **/
+public class LazyApplication {
+
+    public static void main(String[] args) {
+        System.out.println("启动 Spring ApplicationContext...");
+        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(MyConfiguration.class);
+        System.out.println("完成启动 Spring ApplicationContext...");
+
+        System.out.println("准备获取MyService...");
+        MyService myService = context.getBean(MyService.class);
+        System.out.println("成功获取MyService...-->" + myService);
+
+        System.out.println("调用show方法...");
+        myService.show();
+    }
+}

spring-annotation/spring-annotation-lazy/src/main/java/com/xcs/spring/bean/MyBean.java

@@ -0,0 +1,12 @@
+package com.xcs.spring.bean;
+
+public class MyBean {
+
+    public MyBean() {
+        System.out.println("MyBean 的构造函数被调用了!");
+    }
+
+    public void show() {
+        System.out.println("hello world");
+    }
+}

spring-annotation/spring-annotation-lazy/src/main/java/com/xcs/spring/config/MyConfiguration.java

@@ -0,0 +1,23 @@
+package com.xcs.spring.config;
+
+import com.xcs.spring.bean.MyBean;
+import com.xcs.spring.service.MyService;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Lazy;
+
+@Configuration
+public class MyConfiguration {
+
+    @Bean
+    @Lazy
+    public MyBean myBean(){
+        System.out.println("MyBean 初始化了!");
+        return new MyBean();
+    }
+
+    @Bean
+    public MyService myService(){
+        return new MyService();
+    }
+}

spring-annotation/spring-annotation-lazy/src/main/java/com/xcs/spring/service/MyService.java

@@ -0,0 +1,17 @@
+package com.xcs.spring.service;
+
+import com.xcs.spring.bean.MyBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Lazy;
+
+public class MyService  {
+
+    @Autowired
+    @Lazy
+    private MyBean myBean;
+
+    public void show() {
+        System.out.println("@Lazy MyBean = " + myBean.getClass());
+        myBean.show();
+    }
+}