目錄一、ImportResource1.1 定義包和類1.2 定義配置文件1.3 定義Java Config類1.4 測(cè)試代碼二、運(yùn)行一、ImportResource1.1 定義包和類

首先定義一個(gè)不會(huì)被ComponentScan掃描到的包outpackage，如下：

在該包內(nèi)創(chuàng)建一個(gè)類：

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

在資源目錄添加配置文件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'> <!-- 開啟注解模式 --> <context:annotation-config/> <!-- 基于注解自動(dòng)注冊(cè)spring bean --> <context:component-scan base-package='outpackage'/></beans>1.3 定義Java Config類

在啟動(dòng)類平級(jí)目錄或者是子目錄添加java config類保證能夠被springboot掃描到，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 測(cè)試代碼

@SpringBootApplicationpublic class HelloWorldMainApplication { public static void main(String[] args) throws URISyntaxException, IOException {ConfigurableApplicationContext run = SpringApplication.run(HelloWorldMainApplication.class, args);// 獲取通過配置文件定義而被掃描到的類HelloService1 bean = run.getBean(HelloService1.class);System.out.println(bean); }}二、運(yùn)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

為了證明確實(shí)是xml配置文件在起作用，而不是springboot自己掃描注冊(cè)，修改配置類，注釋掉@ImportResource({'classpath:applicationContext.xml'})，如下：

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

然后運(yùn)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)

可以看到就找不到對(duì)應(yīng)的bean了。

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