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Spring 模拟注解开发实例

2024-07-09 04:08:15   220人阅读

1.注解开发无需导入全新的jar包

l使用注解功能需要导入Spring核心jar包
?核心jar包(6个)
?spring-beans-3.2.0.RELEASE.jar
?spring-context-3.2.0.RELEASE.jar
?spring-core-3.2.0.RELEASE.jar
?spring-expression-3.2.0.RELEASE.jar
?commons-logging-1.1.1.jar
?log4j-1.2.15.jar

 2.使用注解开发必须开启命名空间context

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	   xmlns:p="http://www.springframework.org/schema/p"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
		http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context 
		http://www.springframework.org/schema/context/spring-context.xsd
		">
	<!-- 开启自动扫路径，含子包路径 -->
		<context:component-scan base-package="com.hao947"/>
</beans>

    注意：开启自动扫路径，包含子路径   

<context:component-scan base-package="com.hao947"/>

 3.注解格式注入无需设置setter方法

@Component("bean1")
public class Bean1 {
	public void show() {
		System.out.println("bean1....");
	}
}

测试

	public static void main(String[] args) {
		ApplicationContext ac = new ClassPathXmlApplicationContext(
				"applicationContext.xml");
		Bean1 bean1 = (Bean1) ac.getBean("bean1");
		bean1.show();
		System.out.println(bean1);
	}

结果

bean1....
com.hao947.annotation.Bean1@362f0d54


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