Spring 核心概念
IoC（核心中的核心）：Inverse of Control，控制反转。对象创建的权利由程序员交给Spring框架AOP：Aspect Oriented Programming，面向切面编程。在不修改目标对象的源代码情况下，增强IoC容器中Bean的功能DI：Dependency Injection，依赖注入。在Spring框架负责创建Bean对象时，动态的将依赖对象注入到Bean组件中！！Spring容器：就是IoC容器
1.添加依赖
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
</dependencies>
2.添加配置文件applicationContext.xml
在src/main/resources下创建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">
<bean id="video" class="net.cybclass.sp.domain.Video">
<property name="id" value="9"></property>
<property name="title" value="Spring5.X课程"></property>
</bean>
</beans>
bean标签
id属性：指定Bean的名称，在Bean被别的类依赖时使用name属性：用于指定Bean的别名，如果没有id，也可以用nameclass属性：用于指定Bean的来源，要创建Bean的class类，需要全限定名
3.创建Video.java
package net.cybclass.sp.domain;
/**
* @author: wangxiaobo
* @create: 2020-10-03 15:08
**/
public class Video {
private int id;
private String title;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
4.创建app.java
package net.cybclass.sp;
import net.cybclass.sp.domain.Video;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* @author: wangxiaobo
* @create: 2020-10-03 15:11
**/
public class app {
public static void main(String[] args) {
ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
Video video=(Video) applicationContext.getBean("video");
System.out.println(video.getTitle());
}
}
5.运行
