深入学习Spring Bean生命周期

51.Spring-Bean-Lifecycle/pom.xml

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+<?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">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.0.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>cc.mrbird</groupId>
+    <artifactId>demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>demo</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

51.Spring-Bean-Lifecycle/src/main/java/cc/mrbird/DemoApplication.java

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+package cc.mrbird;
+
+import cc.mrbird.demo.config.WebConfig;
+import cc.mrbird.demo.domain.User;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+@SpringBootApplication
+public class DemoApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoApplication.class, args);
+
+        // 返回 IOC 容器，使用注解配置，传入配置类
+        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(WebConfig.class);
+        System.out.println("容器创建完毕");
+        // User user = context.getBean(User.class);
+        // 关闭 IOC 容器
+        context.close();
+    }
+}
+

51.Spring-Bean-Lifecycle/src/main/java/cc/mrbird/demo/config/MyBeanPostProcessor.java

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+package cc.mrbird.demo.config;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.lang.Nullable;
+
+/**
+ * @author MrBird
+ */
+public class MyBeanPostProcessor implements BeanPostProcessor {
+
+    @Override
+    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
+        System.out.println(beanName + " 初始化之前调用");
+        return bean;
+    }
+
+    @Override
+    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
+        System.out.println(beanName + " 初始化之后调用");
+        return bean;
+    }
+}

51.Spring-Bean-Lifecycle/src/main/java/cc/mrbird/demo/config/WebConfig.java

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+package cc.mrbird.demo.config;
+
+import cc.mrbird.demo.domain.Bird;
+import cc.mrbird.demo.domain.Fish;
+import cc.mrbird.demo.domain.User;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Scope;
+
+/**
+ * @author MrBird
+ */
+@Configuration
+public class WebConfig {
+
+    // @Scope("prototype")
+    // @Bean(initMethod = "init", destroyMethod = "destory")
+    // public User user() {
+    //     return new User();
+    // }
+
+    // @Bean
+    // public Bird bird() {
+    //     return new Bird();
+    // }
+
+    @Bean
+    public Fish fish(){
+        return new Fish();
+    }
+
+    @Bean
+    public MyBeanPostProcessor myBeanPostProcessor () {
+        return new MyBeanPostProcessor();
+    }
+}

51.Spring-Bean-Lifecycle/src/main/java/cc/mrbird/demo/domain/Bird.java

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+package cc.mrbird.demo.domain;
+
+import org.springframework.beans.factory.DisposableBean;
+import org.springframework.beans.factory.InitializingBean;
+
+/**
+ * @author MrBird
+ */
+public class Bird implements InitializingBean, DisposableBean {
+
+    public Bird() {
+        System.out.println("调用无参构造器创建Bird");
+    }
+
+    @Override
+    public void destroy() {
+        System.out.println("销毁Bird");
+    }
+
+    @Override
+    public void afterPropertiesSet() {
+        System.out.println("初始化Bird");
+    }
+}

51.Spring-Bean-Lifecycle/src/main/java/cc/mrbird/demo/domain/Fish.java

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+package cc.mrbird.demo.domain;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+
+/**
+ * @author MrBird
+ */
+public class Fish {
+
+    public Fish() {
+        System.out.println("调用无参构造器创建Fish");
+    }
+
+    @PostConstruct
+    public void init() {
+        System.out.println("初始化Fish");
+    }
+
+    @PreDestroy
+    public void destory() {
+        System.out.println("销毁Fish");
+    }
+}

51.Spring-Bean-Lifecycle/src/main/java/cc/mrbird/demo/domain/User.java

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+package cc.mrbird.demo.domain;
+
+/**
+ * @author MrBird
+ */
+public class User {
+
+    public User() {
+        System.out.println("调用无参构造器创建User");
+    }
+
+    public void init() {
+        System.out.println("初始化User");
+    }
+
+    public void destory() {
+        System.out.println("销毁User");
+    }
+}