Spring-BeanFactory/ApplicationContect

女爷i 2021-09-24 10:40 307阅读 0赞

### Spring-BeanFactory/ApplicationContect ###

*  前情提要
 *  核心API
 *  项目目录
 *  项目代码
 *   *  配置文件xml
     *  Java代码
     *   *  接口
         *  实现类
         *  测试类
 *  结果

# 前情提要 #

[IOC-XML配置][IOC-XML]

# 核心API #

![Spring核心API][Spring_API]

*  BeanFactory：
    
     *  Bean工厂，用于生产任意Bean
     *  采取延迟加载，第一次getBean时才会初始化Bean
 *  ApplicationContect：
    
     *  BeanFactory的子类，拓展提供了更多的功能
     *  国际化处理
     *  事件传递
     *  Bean自动装配
     *  各种不同应用层的Context实现
 *  **ClassPathXmlApplicationContext**：用于加载类路径classpath(src文件夹)下的xml文件
 *  FileSystemXmlApplicationContext：用于加载指定盘符下的xml文件

# 项目目录 #

![Spring-BeanFactory/ApplicationContect][Spring-BeanFactory_ApplicationContect]

# 项目代码 #

## 配置文件xml ##

常用名称：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="UserService" class="com.zhangzibu.spring.ioc.service.impl.UserServiceDi"></bean>
    
    </beans>

## Java代码 ##

### 接口 ###

package com.zhangzibu.spring.ioc.service;
    
    public interface UserService { 
    
        void hello(String para);
    
    }

### 实现类 ###

package com.zhangzibu.spring.ioc.service.impl;
    
    import com.zhangzibu.spring.ioc.service.UserService;
    
    public class UserServiceDi implements UserService { 
    
        @Override
        public void hello(String para) { 
            System.out.println("Hello " + para);
        }
    
        public UserServiceDi(){ 
            System.out.println("UserServiceDi------构造函数");
        }
    }

### 测试类 ###

package com.zhangzibu.spring;
    
    import com.zhangzibu.spring.ioc.service.UserService;
    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;
    
    public class SpringTest { 
    
        @Test
        public void test(){ 
            BeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("/applicationContext.xml"));
            System.out.println("BeanFactory....");
            UserService userServiceBeanFactory = (UserService) beanFactory.getBean("UserService");
            userServiceBeanFactory.hello("BeanFactory 张子布");
            
            System.out.println(" ");
            
            ApplicationContext applicationContext = new ClassPathXmlApplicationContext("/applicationContext.xml");
            System.out.println("ApplicationContext....");
            UserService userServiceApplicationContext = (UserService) applicationContext.getBean("UserService");
            userServiceApplicationContext.hello("ApplicationContext 张子布");
        }
    
    }

# 结果 #

BeanFactory....
    UserServiceDi------构造函数
    Hello BeanFactory 张子布
     
    UserServiceDi------构造函数
    ApplicationContext....
    Hello ApplicationContext 张子布

[IOC-XML]: https://mp.csdn.net/console/editor/html/105453586
[Spring_API]: /images/20210923/7983f6da870f43ec9591f0f9ef1e5327.png
[Spring-BeanFactory_ApplicationContect]: /images/20210923/1914e724e2b34804bbf1da9153b5cd55.png

Spring-BeanFactory/ApplicationContect

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