springboot ioc通过扫描装配bean

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本文介绍了SpringBoot项目中如何通过AppConfig.java配置类进行IOC容器的bean扫描和装配，涉及到User.java组件的使用，并在TestApplication.java测试类中进行了验证和应用。

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