Spring注解解析之@ImportResource

目錄

一、ImportResource

1.1 定義包和類(lèi)

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

在該包內創(chuàng )建一個(gè)類(lèi)：

package outpackage;

import org.springframework.stereotype.Service;

@Service
public 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(kāi)啟注解模式 -->
    <context:annotation-config/>

    <!-- 基于注解自動(dòng)注冊spring bean -->
    <context:component-scan base-package="outpackage"/>
</beans>

1.3 定義Java Config類(lèi)

在啟動(dòng)類(lèi)平級目錄或者是子目錄添加java config類(lèi)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 測試代碼

@SpringBootApplication
public class HelloWorldMainApplication {

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

二、運行

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...

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，修改配置類(lèi)，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應的bean了。

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