springboot ioc通过扫描装配bean

项目架构为

AppConfig.java:

package com.nice.boot.config; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; /** * @author ningh */ @Configuration @ComponentScan public class AppConfig { }

 

User.java:

package com.nice.boot.config; import lombok.Data; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; /** * @author ningh */ @Component("user") @Data public class User { @Value("1") private Long id; @Value("nice") private String userName; @Value("感觉不会再爱了") private String note; }

TestApplication.java

package com.nice.boot; import com.nice.boot.config.AppConfig; import com.nice.boot.config.User; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * @author ningh */ public class TestApplication { @Test public void test(){ ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class); User user = context.getBean(User.class); System.out.println(user); } } <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.0.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.nice.boot</groupId> <artifactId>boot-chapter3</artifactId> <version>0.0.1-SNAPSHOT</version> <name>boot-chapter3</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>compile</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>

运行测试类:

D:\Java\jdk1.8.0_202\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.scala\lib\idea_rt.jar=59465:C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.scala\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.scala\lib\idea_rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.scala\plugins\junit\lib\junit-rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.scala\plugins\junit\lib\junit5-rt.jar;D:\Java\jdk1.8.0_202\jre\lib\charsets.jar;D:\Java\jdk1.8.0_202\jre\lib\deploy.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\access-bridge-64.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\cldrdata.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\dnsns.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\jaccess.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\jfxrt.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\localedata.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\nashorn.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\sunec.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\sunjce_provider.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\sunmscapi.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\sunpkcs11.jar;D:\Java\jdk1.8.0_202\jre\lib\ext\zipfs.jar;D:\Java\jdk1.8.0_202\jre\lib\javaws.jar;D:\Java\jdk1.8.0_202\jre\lib\jce.jar;D:\Java\jdk1.8.0_202\jre\lib\jfr.jar;D:\Java\jdk1.8.0_202\jre\lib\jfxswt.jar;D:\Java\jdk1.8.0_202\jre\lib\jsse.jar;D:\Java\jdk1.8.0_202\jre\lib\management-agent.jar;D:\Java\jdk1.8.0_202\jre\lib\plugin.jar;D:\Java\jdk1.8.0_202\jre\lib\resources.jar;D:\Java\jdk1.8.0_202\jre\lib\rt.jar;D:\ideapro\boot-chapter3\target\test-classes;D:\ideapro\boot-chapter3\target\classes;C:\Users\ningh\.m2\repository\org\springframework\boot\spring-boot-starter\2.2.0.RELEASE\spring-boot-starter-2.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\boot\spring-boot\2.2.0.RELEASE\spring-boot-2.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\spring-context\5.2.0.RELEASE\spring-context-5.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\spring-aop\5.2.0.RELEASE\spring-aop-5.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\spring-beans\5.2.0.RELEASE\spring-beans-5.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\spring-expression\5.2.0.RELEASE\spring-expression-5.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.2.0.RELEASE\spring-boot-autoconfigure-2.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.2.0.RELEASE\spring-boot-starter-logging-2.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\ningh\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\ningh\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;C:\Users\ningh\.m2\repository\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;C:\Users\ningh\.m2\repository\org\slf4j\jul-to-slf4j\1.7.28\jul-to-slf4j-1.7.28.jar;C:\Users\ningh\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\ningh\.m2\repository\org\springframework\spring-core\5.2.0.RELEASE\spring-core-5.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\spring-jcl\5.2.0.RELEASE\spring-jcl-5.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;C:\Users\ningh\.m2\repository\org\springframework\boot\spring-boot-devtools\2.2.0.RELEASE\spring-boot-devtools-2.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\projectlombok\lombok\1.18.10\lombok-1.18.10.jar;C:\Users\ningh\.m2\repository\org\springframework\boot\spring-boot-starter-test\2.2.0.RELEASE\spring-boot-starter-test-2.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\boot\spring-boot-test\2.2.0.RELEASE\spring-boot-test-2.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\springframework\boot\spring-boot-test-autoconfigure\2.2.0.RELEASE\spring-boot-test-autoconfigure-2.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\com\jayway\jsonpath\json-path\2.4.0\json-path-2.4.0.jar;C:\Users\ningh\.m2\repository\net\minidev\json-smart\2.3\json-smart-2.3.jar;C:\Users\ningh\.m2\repository\net\minidev\accessors-smart\1.2\accessors-smart-1.2.jar;C:\Users\ningh\.m2\repository\org\ow2\asm\asm\5.0.4\asm-5.0.4.jar;C:\Users\ningh\.m2\repository\org\slf4j\slf4j-api\1.7.28\slf4j-api-1.7.28.jar;C:\Users\ningh\.m2\repository\jakarta\xml\bind\jakarta.xml.bind-api\2.3.2\jakarta.xml.bind-api-2.3.2.jar;C:\Users\ningh\.m2\repository\jakarta\activation\jakarta.activation-api\1.2.1\jakarta.activation-api-1.2.1.jar;C:\Users\ningh\.m2\repository\org\junit\jupiter\junit-jupiter\5.5.2\junit-jupiter-5.5.2.jar;C:\Users\ningh\.m2\repository\org\junit\jupiter\junit-jupiter-api\5.5.2\junit-jupiter-api-5.5.2.jar;C:\Users\ningh\.m2\repository\org\apiguardian\apiguardian-api\1.1.0\apiguardian-api-1.1.0.jar;C:\Users\ningh\.m2\repository\org\opentest4j\opentest4j\1.2.0\opentest4j-1.2.0.jar;C:\Users\ningh\.m2\repository\org\junit\platform\junit-platform-commons\1.5.2\junit-platform-commons-1.5.2.jar;C:\Users\ningh\.m2\repository\org\junit\jupiter\junit-jupiter-params\5.5.2\junit-jupiter-params-5.5.2.jar;C:\Users\ningh\.m2\repository\org\junit\jupiter\junit-jupiter-engine\5.5.2\junit-jupiter-engine-5.5.2.jar;C:\Users\ningh\.m2\repository\org\junit\platform\junit-platform-engine\1.5.2\junit-platform-engine-1.5.2.jar;C:\Users\ningh\.m2\repository\org\mockito\mockito-junit-jupiter\3.1.0\mockito-junit-jupiter-3.1.0.jar;C:\Users\ningh\.m2\repository\org\assertj\assertj-core\3.13.2\assertj-core-3.13.2.jar;C:\Users\ningh\.m2\repository\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar;C:\Users\ningh\.m2\repository\org\mockito\mockito-core\3.1.0\mockito-core-3.1.0.jar;C:\Users\ningh\.m2\repository\net\bytebuddy\byte-buddy\1.10.1\byte-buddy-1.10.1.jar;C:\Users\ningh\.m2\repository\net\bytebuddy\byte-buddy-agent\1.10.1\byte-buddy-agent-1.10.1.jar;C:\Users\ningh\.m2\repository\org\objenesis\objenesis\2.6\objenesis-2.6.jar;C:\Users\ningh\.m2\repository\org\skyscreamer\jsonassert\1.5.0\jsonassert-1.5.0.jar;C:\Users\ningh\.m2\repository\com\vaadin\external\google\android-json\0.0.20131108.vaadin1\android-json-0.0.20131108.vaadin1.jar;C:\Users\ningh\.m2\repository\org\springframework\spring-test\5.2.0.RELEASE\spring-test-5.2.0.RELEASE.jar;C:\Users\ningh\.m2\repository\org\xmlunit\xmlunit-core\2.6.3\xmlunit-core-2.6.3.jar;C:\Users\ningh\.m2\repository\junit\junit\4.12\junit-4.12.jar;C:\Users\ningh\.m2\repository\org\hamcrest\hamcrest-core\2.1\hamcrest-core-2.1.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.nice.boot.TestApplication,test 02:07:06.982 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@57829d67 02:07:07.194 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor' 02:07:07.239 [main] DEBUG org.springframework.context.annotation.ClassPathBeanDefinitionScanner - Identified candidate component class: file [D:\ideapro\boot-chapter3\target\classes\com\nice\boot\config\User.class] 02:07:07.298 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor' 02:07:07.300 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory' 02:07:07.301 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor' 02:07:07.302 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor' 02:07:07.308 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'appConfig' 02:07:07.312 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'user' User(id=1, userName=nice, note=感觉不会再爱了) Process finished with exit code 0