Spring 01.简单的 IOC

Love The Way You Lie 2022-04-16 00:28 125阅读 0赞

实现简单的Spring IOC 依赖注入

第一步：增加maven依赖  
pom.xml

<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>org.yxl.spring01</groupId>
    	<artifactId>spring_01</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<dependencies>
    		<dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>4.3.5.RELEASE</version>
            </dependency>
        </dependencies>
    </project>

Hello.java

第二步 :编写一个简单的pojo类
    package org.spring01;
    public class Hello { 
    	private String name;
    
    	public String getName() { 
    		return name;
    	}
    
    	public void setName(String name) { 
    		this.name = name;
    	}
    
    	public void show() { 
    		System.out.println(name);
    
    	}
    }

第三步 :编写Spring配置文件，该文件路径在根目录下。src/main/java/beans.xml  
beans.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="hello" name="h1,h2,h3" class='org.spring01.Hello'>
      	<property name="name" value="张三"></property>
      </bean>
    </beans>

第四步：编写测试类  
Test.java

package org.spring01;
    
    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Test { 
    	public static void main(String[] args)  { 
    		try { 
    			//解析beans.xml文件生成管理相应的bean对象
    			ApplicationContext context=new ClassPathXmlApplicationContext("beans.xml");
    			//根据bean名称获取Hello对象
    			Hello he=(Hello) context.getBean("h1");
    			he.show();
    		} catch (BeansException e) { 
    			e.printStackTrace();
    		}
    	}
    }

备注：bean的name属性可以有多个。用空格或者逗号分割。

参考连接：[https://blog.csdn.net/fyduan/article/details/50389130][https_blog.csdn.net_fyduan_article_details_50389130]

[https_blog.csdn.net_fyduan_article_details_50389130]: https://blog.csdn.net/fyduan/article/details/50389130