Spring注解解析之@ImportResource

目录一、ImportResource1.1 定义包和类1.2 定义配置文件1.3 定义Java Config类1.4 测试代码二、运行一、ImportResource1.1 定义包和类

首先定义一个不会被ComponentScan扫描到的包outpackage，如下：

在该包内创建一个类：

package outpackage;import org.springframework.stereotype.Service;@Servicepublic class HelloService1 { public void method1() {System.out.println('class:HelloService1__method:method1'); }}1.2 定义配置文件

在资源目录添加配置文件applicationContext.xml：

<beans xmlns='http://www.springframework.org/schema/beans' 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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd'> <!-- 开启注解模式 --> <context:annotation-config/> <!-- 基于注解自动注册spring bean --> <context:component-scan base-package='outpackage'/></beans>1.3 定义Java Config类

在启动类平级目录或者是子目录添加java config类保证能够被springboot扫描到，引入xml配置，如下：

package dongshi.daddy;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.ImportResource;@Configuration@ImportResource({'classpath:applicationContext.xml'})public class OuterPackageConfiguration {}1.4 测试代码

@SpringBootApplicationpublic class HelloWorldMainApplication { public static void main(String[] args) throws URISyntaxException, IOException {ConfigurableApplicationContext run = SpringApplication.run(HelloWorldMainApplication.class, args);// 获取通过配置文件定义而被扫描到的类HelloService1 bean = run.getBean(HelloService1.class);System.out.println(bean); }}二、运行

2021-05-19 17:52:52.896 INFO 16232 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8083 (http) with context path ’’...snip...outpackage.HelloService1@1929425f

为了证明确实是xml配置文件在起作用，而不是springboot自己扫描注册，修改配置类，注释掉@ImportResource({'classpath:applicationContext.xml'})，如下：

package dongshi.daddy;import org.springframework.context.annotation.Configuration;@Configuration//@ImportResource({'classpath:applicationContext.xml'})public class OuterPackageConfiguration {}

然后运行：

2021-05-19 18:01:10.522 INFO 18260 --- [ main] dongshi.daddy.HelloWorldMainApplication : Started HelloWorldMainApplication in 0.944 seconds (JVM running for 1.355)Exception in thread 'main' org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ’outpackage.HelloService1’ available at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:351) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:342) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1123) at dongshi.daddy.HelloWorldMainApplication.main(HelloWorldMainApplication.java:16)

可以看到就找不到对应的bean了。

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