Spring 已经盛行多年,目前已经处于3.0阶段,关于Spring的概念介绍性的东西网上已经很多,本系列博客主要是把一些知识点通过代码的方式总结起来,以便查阅.

作为入门,本篇主要介绍Bean的加载

工具类

 

package com.eric.introduce;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.eric.introduce.di.ConferenceRoom;import com.eric.introduce.di.DummyConfig;import com.eric.introduce.di.Knight;import com.eric.introduce.di.Performer;import com.eric.introduce.di.RescueDamselQuest;/** * @author Eric *  */public class IntroduceUtil {	private static final String CONFIG_FILE = "com/eric/introduce/introduce.xml";	private static ApplicationContext context = new ClassPathXmlApplicationContext(			CONFIG_FILE);	/**	 * 通过ClassPathXmlApplication获得Bean实例	 */	public static void demonstrateDIByClassContent() {		Knight knight = (Knight) context.getBean("knight");		knight.embarkOnQuest();	}	/**	 * 默认情况下Context总是返回同一个对象	 */	public static void demonstrateSingleStonClassContent() {		Knight knight1 = (Knight) context.getBean("knight");		Knight knight2 = (Knight) context.getBean("knight");		System.out.println(knight1);		System.out.println(knight2);	}	/**	 * Spring中的singleSton只是正对一个context而言,不同的上下文会有不同的实例	 */	public static void demonstrateSingleStonInContent() {		ApplicationContext anotherContext = new ClassPathXmlApplicationContext(				CONFIG_FILE);		Knight knight1 = (Knight) context.getBean("knight");		Knight knight2 = (Knight) anotherContext.getBean("knight");		System.out.println(knight1);		System.out.println(knight2);	}	/**	 * 通过factoryMethod 加载Bean	 * 	 **/	public static void demonstrateLoadBeanByFactory() {		DummyConfig dummyConfig = (DummyConfig) context.getBean("config");		System.out.println(dummyConfig.getConfigurationMap());	}	/**	 * 如果通过factoryMethod的方式加载Bean,即使是不同的Context,任然返回的是同一个Bean实例	 * 	 **/	public static void demonstrateLoadBeanByFactory2() {		ApplicationContext anotherContext = new ClassPathXmlApplicationContext(				CONFIG_FILE);		DummyConfig dummyConfig = (DummyConfig) context.getBean("config");		DummyConfig dummyConfig2 = (DummyConfig) anotherContext				.getBean("config");		System.out.println(dummyConfig);		System.out.println(dummyConfig2);	}	/**	 * 但Bean定义了Scope设置为Prototype后,每次会实例化不同的实例	 */	public static void demonstratePrototypeBean() {		RescueDamselQuest quest1 = (RescueDamselQuest) context				.getBean("prototypeQuest");		RescueDamselQuest quest2 = (RescueDamselQuest) context				.getBean("prototypeQuest");		System.out.println(quest1);		System.out.println(quest2);	}	/**	 * 验证init以及destory方法	 * 	 **/	public static void demonstrateInitAndDestory() {		ConferenceRoom conferenceRoom = (ConferenceRoom) context				.getBean("conferenceRoom");		conferenceRoom.use();	}	/**	 * 验证了注入集合的几种方法	 */	public static void demostrateInjectionPropertieWays() {		Performer performer = (Performer) context				.getBean("instrumentPerformer");		performer.performer();		performer.eatFruit();		performer.printProperties();	}}

 

 

配置文件

 

    
    	
     		
      	
     	
     	
     	
     	
     	
     	
     	
     	
     	
     		
      		
      		
      		
      			
       		
      		
      			
       				
        				
        			
       		
      		
      			
       				
        
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由于功能都比较简单,通过调用方法以及配置文件应该就可以看出用法,所以只列出了部分文件.

 

如果需要完整事例,请下载附件