Spring注解解析之@ImportResource

Spring注解解析之@ImportResource

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：

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.0.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.0.xsd">

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans-3.0.xsd

http://springframework.org/schema/context

http://springframework.org/schema/context/spring-context-3.0.xsd">

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.annotatirFlSIon.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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