一、ImportResource
1.1 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;
@Service
public 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
@SpringBootApplication
public 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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