From 06a981d273d90eb59a33921af0c78be2be6082e6 Mon Sep 17 00:00:00 2001 From: linlei Date: Mon, 22 Apr 2024 17:43:59 +0800 Subject: [PATCH] =?UTF-8?q?TargetSourceCreator=E6=BA=90=E7=A0=81=E5=88=86?= =?UTF-8?q?=E6=9E=90?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- README.md | 1 + spring-aop/pom.xml | 1 + .../spring-aop-targetSourceCreator/README.md | 356 ++++++++++++++++++ .../spring-aop-targetSourceCreator/pom.xml | 14 + .../main/java/com/xcs/spring/AppConfig.java | 12 + .../spring/ConnectionPoolTargetSource.java | 86 +++++ .../java/com/xcs/spring/MyConnection.java | 28 ++ .../com/xcs/spring/MyTargetSourceCreator.java | 14 + .../xcs/spring/SetMyTargetSourceCreator.java | 25 ++ .../xcs/spring/TargetSourceCreatorDemo.java | 19 + 10 files changed, 556 insertions(+) create mode 100644 spring-aop/spring-aop-targetSourceCreator/README.md create mode 100644 spring-aop/spring-aop-targetSourceCreator/pom.xml create mode 100644 spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/AppConfig.java create mode 100644 spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/ConnectionPoolTargetSource.java create mode 100644 spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/MyConnection.java create mode 100644 spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/MyTargetSourceCreator.java create mode 100644 spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/SetMyTargetSourceCreator.java create mode 100644 spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/TargetSourceCreatorDemo.java diff --git a/README.md b/README.md index 18852b2..d25bdca 100644 --- a/README.md +++ b/README.md @@ -213,6 +213,7 @@ - [AdvisorAdapter](spring-aop/spring-aop-advisorAdapter/README.md):适配不同类型通知到拦截器链。 - [Advised](spring-aop/spring-aop-advised/README.md):配置AOP代理的通知、通知器、目标等。 - [TargetSource](spring-aop/spring-aop-targetSource/README.md):管理AOP代理对象的获取与释放。 + - [TargetSourceCreator](spring-aop/spring-aop-targetSourceCreator/README.md):创建特殊的目标源,定制代理对象的创建和管理。 - [@EnableAspectJAutoProxy](spring-aop/spring-aop-enableAspectJAutoProxy/README.md):启用AspectJ切面自动代理。 - [@EnableLoadTimeWeaving](spring-aop/spring-aop-enableLoadTimeWeaving/README.md):启用Spring加载时编织。 - [AspectInstanceFactory](spring-aop/spring-aop-aspectInstanceFactory/README.md):创建切面实例,支持多种实现方式。 diff --git a/spring-aop/pom.xml b/spring-aop/pom.xml index 6516954..cf95a52 100644 --- a/spring-aop/pom.xml +++ b/spring-aop/pom.xml @@ -37,6 +37,7 @@ spring-aop-advisorAdapterRegistry spring-aop-advised spring-aop-aopContext + spring-aop-targetSourceCreator 4.0.0 diff --git a/spring-aop/spring-aop-targetSourceCreator/README.md b/spring-aop/spring-aop-targetSourceCreator/README.md new file mode 100644 index 0000000..7a32f39 --- /dev/null +++ b/spring-aop/spring-aop-targetSourceCreator/README.md @@ -0,0 +1,356 @@ +## TargetSourceCreator + +- [TargetSourceCreator](#TargetSourceCreator) + - [一、基本信息](#一基本信息) + - [二、基本描述](#二基本描述) + - [三、主要功能](#三主要功能) + - [四、接口源码](#四接口源码) + - [五、主要实现](#五主要实现) + - [六、最佳实践](#六最佳实践) + - [七、源码分析](#七源码分析) + - [八、常见问题](#八常见问题) + +### 一、基本信息 + +✒️ **作者** - Lex 📝 **博客** - [掘金](https://juejin.cn/user/4251135018533068/posts) 📚 **源码地址** - [github](https://github.com/xuchengsheng/spring-reading) + +### 二、基本描述 + +`TargetSourceCreator`接口,主要用于创建目标对象的代理。通过实现该接口,你可以自定义代理对象的创建逻辑,例如根据不同的条件返回不同的代理对象。这在AOP(面向切面编程)和代理模式中非常有用,可以灵活地控制代理对象的生成过程。 + +### 三、主要功能 + +1. **创建代理对象的目标源(TargetSource)** + + + 该接口允许我们定义创建代理对象的逻辑,包括决定何时创建代理对象以及如何创建代理对象的目标源。 + +2. **定制代理对象的创建过程** + + + 通过实现该接口,你可以根据需要定制代理对象的创建过程。这包括根据不同的条件返回不同的目标源,或者在创建代理对象之前或之后执行特定的逻辑。 + +3. **支持AOP的灵活配置** + + + 在Spring框架中,AOP(面向切面编程)经常使用代理对象来实现横切关注点。`TargetSourceCreator`接口允许我们灵活地控制代理对象的生成过程,从而为AOP提供了更高的定制性和灵活性。 + +### 四、接口源码 + +`TargetSourceCreator`接口,它允许实现类创建特殊的目标源(TargetSource),例如池化目标源,用于特定的bean。实现类可以基于目标类的属性,如池化属性,来决定选择哪种类型的目标源。`AbstractAutoProxyCreator`可以支持多个`TargetSourceCreators`,它们将按顺序应用,为Spring框架中的代理对象创建提供了灵活性和定制性。 + +```java +/** + * 实现类可以为特定的bean创建特殊的目标源,例如池化目标源。例如,它们可以根据目标类上的属性(例如池化属性)来选择目标源。 + * + *

AbstractAutoProxyCreator 可以支持多个 TargetSourceCreators,它们将按顺序应用。 + * + * @author Rod Johnson + * @author Juergen Hoeller + */ +@FunctionalInterface +public interface TargetSourceCreator { + + /** + * 为给定的bean创建一个特殊的目标源(如果有的话)。 + * @param beanClass bean的类 + * @param beanName bean的名称 + * @return 特殊的目标源,如果此 TargetSourceCreator 不感兴趣于特定的bean,则返回 {@code null} + */ + @Nullable + TargetSource getTargetSource(Class beanClass, String beanName); + +} +``` + +### 五、主要实现 + +1. **QuickTargetSourceCreator** + + + 用于快速创建目标源。它适用于那些不需要延迟加载的情况,通过特定的条件或策略,可以快速地生成目标源,以提高性能或满足其他需求。 + +2. **LazyInitTargetSourceCreator** + + + 用于延迟创建目标源。它适用于需要延迟加载的场景,以减少启动时间或资源占用。根据特定的条件或策略,它会延迟地创建目标源,直到被请求时才进行加载。 + +### 六、最佳实践 + +使用Spring框架中的注解配置来创建应用程序上下文,并从上下文中获取`MyConnection` bean。然后,它打印了`MyConnection`实例的类名,并循环调用了`MyConnection`实例的`getName()`方法来获取实例的名称并打印输出。 + +```java +public class TargetSourceCreatorDemo { + public static void main(String[] args) { + // 创建一个基于注解的应用程序上下文 + AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class); + // 从上下文中获取 MyConnection bean + MyConnection myConnection = context.getBean(MyConnection.class); + // 打印 MyConnection 实例的类名 + System.out.println("MyConnection Class = " + myConnection.getClass()); + // 循环调用 MyConnection 实例的 getName() 方法 + for (int i = 0; i < 10; i++) { + // 打印 MyConnection 实例的名称 + System.out.println("MyConnection Name = " + myConnection.getName()); + } + } +} +``` + +通过`@EnableAspectJAutoProxy`注解启用了AspectJ自动代理功能,允许Spring框架创建和管理切面(Aspects)。同时,通过`@Configuration`注解标识这是一个配置类,并使用`@ComponentScan("com.xcs.spring")`注解来指定需要扫描的包,以便Spring能够自动装配Bean和发现组件。 + +```java +@EnableAspectJAutoProxy +@Configuration +@ComponentScan("com.xcs.spring") +public class AppConfig { + +} +``` + +`SetMyTargetSourceCreator`类实现了Spring框架的`BeanPostProcessor`接口和`PriorityOrdered`接口。在`postProcessAfterInitialization`方法中,通过判断bean是否为`AbstractAutoProxyCreator`的实例,然后为其设置了自定义的目标源创建器`MyTargetSourceCreator`。通过实现`PriorityOrdered`接口并重写`getOrder`方法,确保了该后置处理器具有最高的优先级,以确保在其他后置处理器之前执行。 + +```java +@Component +public class SetMyTargetSourceCreator implements BeanPostProcessor , PriorityOrdered { + + @Override + public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { + if (bean instanceof AbstractAutoProxyCreator) { + ((AbstractAutoProxyCreator) bean).setCustomTargetSourceCreators(new MyTargetSourceCreator()); + } + return bean; + } + + @Override + public int getOrder() { + return Ordered.HIGHEST_PRECEDENCE; + } +} +``` + +`MyTargetSourceCreator`类实现了`TargetSourceCreator`接口。在`getTargetSource`方法中,它根据传入的bean类和bean名称来判断是否需要为特定的bean创建目标源。如果传入的bean类是`MyConnection`类或其子类,它将返回一个具有连接池功能的目标源`ConnectionPoolTargetSource`,并设置连接池的大小为3。 + +```java +public class MyTargetSourceCreator implements TargetSourceCreator { + @Override + public TargetSource getTargetSource(Class beanClass, String beanName) { + if (MyConnection.class.isAssignableFrom(beanClass)) { + return new ConnectionPoolTargetSource(3); + } + return null; + } +} +``` + +`ConnectionPoolTargetSource` 类实现了 Spring 的 `TargetSource` 接口,用于管理自定义连接对象的连接池。在构造函数中,它会初始化一个固定大小的阻塞队列作为连接池,并填充连接对象。通过实现 `getTarget()` 方法,它能够从连接池中获取连接对象,并在 `releaseTarget()` 方法中释放连接对象。 + +```java +/** + * 连接池目标源,用于管理自定义连接对象的连接池。 + * + * @author xcs + * @date 2024年4月9日15:26:28 + */ +public class ConnectionPoolTargetSource implements TargetSource { + + /** + * 连接池 + */ + private final BlockingQueue connectionPool; + + /** + * 构造函数,初始化连接池。 + * + * @param poolSize 连接池大小 + */ + public ConnectionPoolTargetSource(int poolSize) { + this.connectionPool = new ArrayBlockingQueue<>(poolSize); + initializeConnectionPool(poolSize); + } + + /** + * 初始化连接池,填充连接对象。 + * + * @param poolSize 连接池大小 + */ + private void initializeConnectionPool(int poolSize) { + for (int i = 0; i < poolSize; i++) { + MyConnection connection = new MyConnection("Connection" + i); + connectionPool.offer(connection); + } + } + + /** + * 获取目标类的类型。 + * + * @return 目标类的类型 + */ + @Override + public Class getTargetClass() { + return MyConnection.class; + } + + /** + * 判断目标对象是否是静态的。 + * + * @return 如果目标对象是静态的,则返回true,否则返回false + */ + @Override + public boolean isStatic() { + return false; + } + + /** + * 获取连接对象。 + * + * @return 连接对象 + * @throws Exception 如果获取连接对象时发生异常 + */ + @Override + public Object getTarget() throws Exception { + return connectionPool.take(); + } + + /** + * 释放连接对象。 + * + * @param target 待释放的连接对象 + * @throws Exception 如果释放连接对象时发生异常 + */ + @Override + public void releaseTarget(Object target) throws Exception { + if (target instanceof MyConnection) { + connectionPool.offer((MyConnection) target); + } + } +} +``` + +`MyConnection` 类代表了一个自定义的连接对象。 + +```java +public class MyConnection { + + private String name; + + public MyConnection(String name) { + this.name = name; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + @Override + public String toString() { + return "MyConnection{" + + "name='" + name + '\'' + + '}'; + } +} +``` + +运行结果,`MyTargetSourceCreator`类成功地为`MyConnection`类创建了一个连接池目标源。Spring框架通过CGLIB动态代理增强了`MyConnection`类,使其能够使用连接池功能。每次调用`getName()`方法时,都从连接池中获取连接,并返回连续的"Connection0"、"Connection1"和"Connection2"字符串,表明连接池的大小为3且连接名称在连接池中循环使用。 + +```java +MyConnection Class = class com.xcs.spring.MyConnection$$EnhancerBySpringCGLIB$$fb2fa879 +MyConnection Name = Connection0 +MyConnection Name = Connection1 +MyConnection Name = Connection2 +MyConnection Name = Connection0 +MyConnection Name = Connection1 +MyConnection Name = Connection2 +MyConnection Name = Connection0 +MyConnection Name = Connection1 +MyConnection Name = Connection2 +MyConnection Name = Connection0 +``` + +### 七、源码分析 + +在`org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator#postProcessBeforeInstantiation`方法中,在Bean实例化之前进行处理。首先,它检查缓存中是否存在目标Bean的信息,如果存在则直接返回null,否则继续执行。然后,它检查Bean是否是基础设施类或是否应该被跳过,如果是,则将其标记为不需要增强,并返回null。最后,如果存在自定义的目标源(TargetSource),则创建代理对象,并使用自定义的目标源处理目标实例,从而避免不必要的默认实例化过程。 + +```java +@Override +public Object postProcessBeforeInstantiation(Class beanClass, String beanName) { + // 获取缓存键 + Object cacheKey = getCacheKey(beanClass, beanName); + + // 如果bean名称为空或不在目标源bean列表中,且缓存中存在该键,则返回null + if (!StringUtils.hasLength(beanName) || !this.targetSourcedBeans.contains(beanName)) { + if (this.advisedBeans.containsKey(cacheKey)) { + return null; + } + // 如果bean类是基础设施类或应跳过,则将其标记为不需要增强,并返回null + if (isInfrastructureClass(beanClass) || shouldSkip(beanClass, beanName)) { + this.advisedBeans.put(cacheKey, Boolean.FALSE); + return null; + } + } + + // 如果存在自定义的目标源,则在此处创建代理: + // 避免不必要的目标bean默认实例化: + // 目标源将以自定义方式处理目标实例。 + TargetSource targetSource = getCustomTargetSource(beanClass, beanName); + if (targetSource != null) { + // 如果bean名称不为空,则将其添加到目标源bean列表中 + if (StringUtils.hasLength(beanName)) { + this.targetSourcedBeans.add(beanName); + } + // 获取适用于bean的特定拦截器和增强器 + Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(beanClass, beanName, targetSource); + // 创建代理对象 + Object proxy = createProxy(beanClass, beanName, specificInterceptors, targetSource); + // 将代理对象的类与缓存键关联 + this.proxyTypes.put(cacheKey, proxy.getClass()); + return proxy; + } + + return null; +} +``` + +在`org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator#getCustomTargetSource`方法中,根据bean的类和名称创建目标源(TargetSource)。如果设置了自定义的TargetSourceCreators,并且bean工厂中包含了指定名称的bean,则会尝试使用这些TargetSourceCreators来创建目标源。方法会遍历所有的TargetSourceCreators,调用它们的getTargetSource方法来获取目标源。如果找到了匹配的目标源,则返回该目标源;否则返回null。 + +```java +/** + * 为bean实例创建目标源。如果设置了任何TargetSourceCreators,则使用它们。 + * 如果不应使用自定义的TargetSource,则返回{@code null}。 + *

此实现使用"customTargetSourceCreators"属性。 + * 子类可以重写此方法以使用不同的机制。 + * @param beanClass bean的类 + * @param beanName bean的名称 + * @return 用于此bean的目标源 + * @see #setCustomTargetSourceCreators + */ +@Nullable +protected TargetSource getCustomTargetSource(Class beanClass, String beanName) { + // 对于直接注册的单例bean,我们无法创建复杂的目标源。 + if (this.customTargetSourceCreators != null && + this.beanFactory != null && this.beanFactory.containsBean(beanName)) { + // 遍历所有的TargetSourceCreators + for (TargetSourceCreator tsc : this.customTargetSourceCreators) { + // 通过TargetSourceCreator获取目标源 + TargetSource ts = tsc.getTargetSource(beanClass, beanName); + // 如果找到匹配的目标源,则返回 + if (ts != null) { + // 找到了匹配的目标源。 + if (logger.isTraceEnabled()) { + logger.trace("TargetSourceCreator [" + tsc + + "] found custom TargetSource for bean with name '" + beanName + "'"); + } + return ts; + } + } + } + + // 没有找到自定义的目标源。 + return null; +} +``` + +### 八、常见问题 + +1. **如何在Spring应用程序中配置和使用TargetSourceCreator?** + + - 配置`TargetSourceCreator`,创建一个实现`BeanPostProcessor`和`PriorityOrdered`接口的自定义类`SetMyTargetSourceCreator`,在其`postProcessAfterInitialization`方法中设置自定义的目标源创建器。 \ No newline at end of file diff --git a/spring-aop/spring-aop-targetSourceCreator/pom.xml b/spring-aop/spring-aop-targetSourceCreator/pom.xml new file mode 100644 index 0000000..e69a851 --- /dev/null +++ b/spring-aop/spring-aop-targetSourceCreator/pom.xml @@ -0,0 +1,14 @@ + + + + com.xcs.spring + spring-aop + 0.0.1-SNAPSHOT + + + 4.0.0 + spring-aop-targetSourceCreator + + \ No newline at end of file diff --git a/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/AppConfig.java b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/AppConfig.java new file mode 100644 index 0000000..7c79966 --- /dev/null +++ b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/AppConfig.java @@ -0,0 +1,12 @@ +package com.xcs.spring; + +import org.springframework.context.annotation.ComponentScan; +import org.springframework.context.annotation.Configuration; +import org.springframework.context.annotation.EnableAspectJAutoProxy; + +@EnableAspectJAutoProxy +@Configuration +@ComponentScan("com.xcs.spring") +public class AppConfig { + +} diff --git a/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/ConnectionPoolTargetSource.java b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/ConnectionPoolTargetSource.java new file mode 100644 index 0000000..9921d34 --- /dev/null +++ b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/ConnectionPoolTargetSource.java @@ -0,0 +1,86 @@ +package com.xcs.spring; + +import org.springframework.aop.TargetSource; + +import java.util.concurrent.ArrayBlockingQueue; +import java.util.concurrent.BlockingQueue; + +/** + * 连接池目标源,用于管理自定义连接对象的连接池。 + * + * @author xcs + * @date 2024年4月9日15:26:28 + */ +public class ConnectionPoolTargetSource implements TargetSource { + + /** + * 连接池 + */ + private final BlockingQueue connectionPool; + + /** + * 构造函数,初始化连接池。 + * + * @param poolSize 连接池大小 + */ + public ConnectionPoolTargetSource(int poolSize) { + this.connectionPool = new ArrayBlockingQueue<>(poolSize); + initializeConnectionPool(poolSize); + } + + /** + * 初始化连接池,填充连接对象。 + * + * @param poolSize 连接池大小 + */ + private void initializeConnectionPool(int poolSize) { + for (int i = 0; i < poolSize; i++) { + MyConnection connection = new MyConnection("Connection" + i); + connectionPool.offer(connection); + } + } + + /** + * 获取目标类的类型。 + * + * @return 目标类的类型 + */ + @Override + public Class getTargetClass() { + return MyConnection.class; + } + + /** + * 判断目标对象是否是静态的。 + * + * @return 如果目标对象是静态的,则返回true,否则返回false + */ + @Override + public boolean isStatic() { + return false; + } + + /** + * 获取连接对象。 + * + * @return 连接对象 + * @throws Exception 如果获取连接对象时发生异常 + */ + @Override + public Object getTarget() throws Exception { + return connectionPool.take(); + } + + /** + * 释放连接对象。 + * + * @param target 待释放的连接对象 + * @throws Exception 如果释放连接对象时发生异常 + */ + @Override + public void releaseTarget(Object target) throws Exception { + if (target instanceof MyConnection) { + connectionPool.offer((MyConnection) target); + } + } +} diff --git a/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/MyConnection.java b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/MyConnection.java new file mode 100644 index 0000000..1878f83 --- /dev/null +++ b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/MyConnection.java @@ -0,0 +1,28 @@ +package com.xcs.spring; + +import org.springframework.stereotype.Service; + +@Service +public class MyConnection { + + private String name; + + public MyConnection(String name) { + this.name = name; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + @Override + public String toString() { + return "MyConnection{" + + "name='" + name + '\'' + + '}'; + } +} diff --git a/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/MyTargetSourceCreator.java b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/MyTargetSourceCreator.java new file mode 100644 index 0000000..30b99d0 --- /dev/null +++ b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/MyTargetSourceCreator.java @@ -0,0 +1,14 @@ +package com.xcs.spring; + +import org.springframework.aop.TargetSource; +import org.springframework.aop.framework.autoproxy.TargetSourceCreator; + +public class MyTargetSourceCreator implements TargetSourceCreator { + @Override + public TargetSource getTargetSource(Class beanClass, String beanName) { + if (MyConnection.class.isAssignableFrom(beanClass)) { + return new ConnectionPoolTargetSource(3); + } + return null; + } +} diff --git a/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/SetMyTargetSourceCreator.java b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/SetMyTargetSourceCreator.java new file mode 100644 index 0000000..f911dd7 --- /dev/null +++ b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/SetMyTargetSourceCreator.java @@ -0,0 +1,25 @@ +package com.xcs.spring; + +import org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator; +import org.springframework.beans.BeansException; +import org.springframework.beans.factory.config.BeanPostProcessor; +import org.springframework.core.Ordered; +import org.springframework.core.PriorityOrdered; +import org.springframework.stereotype.Component; + +@Component +public class SetMyTargetSourceCreator implements BeanPostProcessor , PriorityOrdered { + + @Override + public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { + if (bean instanceof AbstractAutoProxyCreator) { + ((AbstractAutoProxyCreator) bean).setCustomTargetSourceCreators(new MyTargetSourceCreator()); + } + return bean; + } + + @Override + public int getOrder() { + return Ordered.HIGHEST_PRECEDENCE; + } +} diff --git a/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/TargetSourceCreatorDemo.java b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/TargetSourceCreatorDemo.java new file mode 100644 index 0000000..3be81bf --- /dev/null +++ b/spring-aop/spring-aop-targetSourceCreator/src/main/java/com/xcs/spring/TargetSourceCreatorDemo.java @@ -0,0 +1,19 @@ +package com.xcs.spring; + +import org.springframework.context.annotation.AnnotationConfigApplicationContext; + +public class TargetSourceCreatorDemo { + public static void main(String[] args) { + // 创建一个基于注解的应用程序上下文 + AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class); + // 从上下文中获取 MyConnection bean + MyConnection myConnection = context.getBean(MyConnection.class); + // 打印 MyConnection 实例的类名 + System.out.println("MyConnection Class = " + myConnection.getClass()); + // 循环调用 MyConnection 实例的 getName() 方法 + for (int i = 0; i < 10; i++) { + // 打印 MyConnection 实例的名称 + System.out.println("MyConnection Name = " + myConnection.getName()); + } + } +}