Spring —— 基本的依赖注入和ApplicationContext容器

逃离我推掉我的手 2023-11-11 06:14 89阅读 0赞

创建java项目，导入spring对应的jar包，这里我就不操作了：

创建bean类：

DoorKey.java：

package com.spring.test;
    
    public class DoorKey {
    	
    	private String name ; //钥匙名
    
    	public String getName() {
    		System.out.println("DoorKey: getName");
    		return name;
    	}
    
    	public void setName(String name) {
    		System.out.println("DoorKey: setName--" + name);
    		this.name = name;
    	}
    
    	@Override
    	public String toString() {
    		return "DoorKey [name=" + name + "]";
    	}
    	
    	
    	
    }

Door.java：

package com.spring.test;
    
    public class Door {
    
    	private String name ; //门名
    	
    	private DoorKey doorKey ;
    
    	public String getName() {
    		System.out.println("Door: getName");
    		return name;
    	}
    
    	public void setName(String name) {
    		System.out.println("Door: setName--" + name);
    		this.name = name;
    	}
    
    	public DoorKey getDoorKey() {
    		System.out.println("Door: getDoorKey");
    		return doorKey;
    	}
    
    	public void setDoorKey(DoorKey doorKey) {
    		System.out.println("Door: setDoorKey--" + doorKey);
    		this.doorKey = doorKey;
    	} 
    	
    	public void openDoor() {
    		System.out.println("开门： 门名--" + this.name + " , 钥匙名--" + doorKey.getName());
    	}
    }

配置文件Context.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-3.0.xsd">
    
       <bean id="door" class="com.spring.test.Door">
           <property name="name" value="芝麻开门"/> 
           <property name="doorKey" ref="doorkey"></property> 
       </bean>
       <bean id="doorkey" class="com.spring.test.DoorKey">
           <property name="name" value="菠萝菠萝蜜"/>
       </bean>
    
    </beans>

测试类MainTest.java：

package com.spring.test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class MainTest {
    	   public static void main(String[] args) {
    		      ApplicationContext context = 
    		             new ClassPathXmlApplicationContext("com/spring/test/Context.xml");
    		      Door obj = (Door) context.getBean("door");
    		      obj.openDoor();
    		   }
    }

右键运行测试类，结果如下，Door 和 DoorKey 对象实例都被创建， 属性都被注入进对象中：

[2019-03-29 01:06:56,014] [INFO] [org.springframework.context.support.ClassPathXmlApplicationContext.prepareRefresh:510] - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1f89ab83: startup date [Fri Mar 29 01:06:56 CST 2019]; root of context hierarchy
    [2019-03-29 01:06:56,080] [INFO] [org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions:317] - Loading XML bean definitions from class path resource [com/spring/test/Context.xml]
    DoorKey: setName--菠萝菠萝蜜
    Door: setName--芝麻开门
    Door: setDoorKey--DoorKey [name=菠萝菠萝蜜]
    DoorKey: getName
    开门： 门名--芝麻开门 , 钥匙名--菠萝菠萝蜜