本文主要是介绍Spring3.0 入门进阶(1):从配置文件装载Bean，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"><bean id="knight" class="com.eric.introduce.di.BraveKnight"><constructor-arg ref="quest"></constructor-arg></bean><bean id="quest" class="com.eric.introduce.di.RescueDamselQuest" /><bean id="minstrel" class="com.eric.introduce.aop.Minstrel" /><bean id="config" class="com.eric.introduce.di.DummyConfig"factory-method="getInstance" /><bean id="prototypeQuest" class="com.eric.introduce.di.RescueDamselQuest"scope="prototype" /><bean id="conferenceRoom" class="com.eric.introduce.di.ConferenceRoom"init-method="beforeUse" destroy-method="afterUse" lazy-init="true" /><bean id="guitar" class="com.eric.introduce.di.Guitar" /><bean id="apple" class="com.eric.introduce.di.Apple" /><bean id="orange" class="com.eric.introduce.di.Orange" /><bean id="instrumentPerformer" class="com.eric.introduce.di.InstrumentPerformer"><property name="name" value="Eric" /><property name="age" value="26" /><property name="instrument" ref="guitar" /><property name="privateInstrument"><bean class="com.eric.introduce.di.Piano"></bean></property><property name="favFruit"><list><ref bean="apple" /><ref bean="orange" /></list></property><property name="properties"><props><prop key="SPORT">FOOTBALL</prop><prop key="CITY">WUHAN</prop></props></property></bean><aop:config><aop:aspect ref="minstrel"><aop:pointcut id="embark" expression="execution(* *.embarkOnQuest(..))" /><aop:before pointcut-ref="embark" method="singleBeforeQuest"></aop:before><aop:after pointcut-ref="embark" method="singleAfterQuest" /></aop:aspect></aop:config>
</beans>
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
这篇关于Spring3.0 入门进阶(1):从配置文件装载Bean的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
