springboot ioc装配bean

最新推荐文章于 2024-08-08 23:50:04 发布

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本文通过一个简单的SpringBoot项目展示了如何使用IoC（Inversion of Control）容器来装配Bean。主要涉及AppConfig配置类、User实体类以及IocTest测试类。在运行main方法时，可以看到SpringBoot成功初始化了Bean并打印了User对象的信息。

项目架构为:

AppConfig代码为:

package com.nice.config;

import com.nice.domain.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author ningh
 */
@Configuration
public class AppConfig {

    @Bean(name = "user")
    public User initUser(){
        User user = new User();
        user.setId(1L);
        user.setUserNme("nice");
        user.setNote("note_1");
        return user;
    }

}

User.java代码为:

package com.nice.domain;

/**
 * @author ningh
 */
public class User {

    private Long id;
    private String userNme;
    private String note;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUserNme() {
        return userNme;
    }

    public void setUserNme(String userNme) {
        this.userNme = userNme;
    }

    public String getNote() {
        return note;
    }

    public void setNote(String note) {
        this.note = note;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userNme='" + userNme + '\'' +
                ", note='" + note + '\'' +
                '}';
    }
}

IocTest代码为:

package com.nice;

import com.nice.config.AppConfig;
import com.nice.domain.User;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * @author ningh
 */
public class IocTest {

    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
        User user = context.getBean(User.class);
        System.out.println(user);
    }

}

运行main方法，打印结果为:

D:\Java\jdk1.8.0_202\bin\java.exe "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.scala\lib\idea_rt.jar=54968:C:\Program Files\JetBrains\IntelliJ IDEA 2019.2.scala\bin" -Dfile.encoding=UTF-8 -classpath 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\nice-boot-bean\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\slf4j\slf4j-api\1.7.28\slf4j-api-1.7.28.jar com.nice.IocTest
18:53:36.491 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@1c4af82c
18:53:36.503 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
18:53:36.590 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerProcessor'
18:53:36.591 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
18:53:36.592 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalAutowiredAnnotationProcessor'
18:53:36.594 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'org.springframework.context.annotation.internalCommonAnnotationProcessor'
18:53:36.599 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'appConfig'
18:53:36.603 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Creating shared instance of singleton bean 'user'
User{id=1, userNme='nice', note='note_1'}

Process finished with exit code 0