Spring的ioc容器

pom.xml：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.ujiuye</groupId>
    <artifactId>Spring01</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>

    <properties>
        <!--
            定义全局变量：变量名为project.spring.version
        -->
        <project.spring.version>5.0.0.RELEASE</project.spring.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${project.spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${project.spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${project.spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${project.spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${project.spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${project.spring.version}</version>
        </dependency>

    </dependencies>

    <build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-resources-plugin</artifactId>
            <version>2.6</version>
        </plugin>
    </plugins>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
        </resource>
        <resource>
            <directory>src/main/java</directory>
            <filtering>true</filtering>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
        </resource>
    </resources>
    </build>


</project>

applicationContext.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--导入其他的spring配置文件
        resource：从classes路径开始寻找文件
        classpath：表示指定从classes路径开始寻找配置文件
    -->

    <import resource="classpath:com/ujiuye/spring/_01_hello/applicationContext_hello.xml"/>
    <import resource="classpath:com/ujiuye/spring/_02_configuration/applicationContext_configuration.xml"/>

    <bean id="student" class="com.ujiuye.spring._03_test.Student"></bean>

</beans>

_03_test：
Student,java：

package com.ujiuye.spring._03_test;

/**
 * Created by Administrator on 2019/9/2.
 */
public class Student {
    public Student(){
        System.out.println("Student被创建了...");
    }
}

_04_container：
App.java：

package com.ujiuye.spring._04_container;

import com.ujiuye.spring._03_test.Student;
import org.junit.Test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;

/**
 * Created by Administrator on 2019/9/2.
 */
public class App {
    @Test
    public void testApplicationCintext(){
//        在创建容器对象的时候，就会实例化容器管理的对象
        ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
        System.out.println("+====================================");
        Student student = context.getBean(Student.class);
        System.out.println(student);
    }

    @Test
    public void testBeanFactory(){
//        在从容器中获取对象的时候，容器才会实例化被获取的对象
        Resource resource=new ClassPathResource("applicationContext.xml");
        BeanFactory factory=new XmlBeanFactory(resource);
        System.out.println("+====================================");
        Student student = factory.getBean(Student.class);
        System.out.println(student);
    }
}