Bean id的命名约定：
1.遵循XML命名规范
2.由字母数字下划线组成
3.驼峰式，首个单词字母小写，第二个单词首字母要大写
样例项目的结构
xml应该放在src下面的conf中，如果不方法src下将会找不到conf文件
conf-definition.xml
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<?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的六种命名方式 --> <!-- 配置全限定类名，唯一 --> <bean class="com.zc.spring.chapter04.definition.HelloWorldImpl" /> <!-- 指定id，唯一 --> <bean id="helloWorld" class="com.zc.spring.chapter04.definition.HelloWorldImpl" /> <!-- 指定name，唯一 --> <bean name="helloWorldByName" class="com.zc.spring.chapter04.definition.HelloWorldImpl" /> <!-- 指定id和name，唯一 --> <bean id="helloWorldById" name="helloWorldByName01" class="com.zc.spring.chapter04.definition.HelloWorldImpl" /> <!-- 指定多个name，唯一 --> <bean name="bean1;alias11;alias12;alias13" class="com.zc.spring.chapter04.definition.HelloWorldImpl" /> <bean id="bean2" name="alias21;alias22;alias23" class="com.zc.spring.chapter04.definition.HelloWorldImpl" /> <!-- 指定别名，唯一 --> <bean name="bean3" class="com.zc.spring.chapter04.definition.HelloWorldImpl" /> <alias name="bean3" alias="alias31"/> <alias name="bean3" alias="alias32"/> <alias name="bean3" alias="alias33"/> </beans> |
HelloWorld接口
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package com.zc.spring.chapter04.definition;public class HelloWorldImpl implements HelloWorld { @Override public void sayHello() { System.out.println("Hello World!"); }} |
Main运行类
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package com.zc.spring.chapter04.definition;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main { public static void main(String[] args) { sayHelloWorldByAlias(); } public static void sayHelloWorldById() { BeanFactory beanFactory = new ClassPathXmlApplicationContext("conf/conf-definition.xml"); HelloWorld helloWorld = beanFactory.getBean("helloWorld", HelloWorld.class); helloWorld.sayHello(); } public static void sayHelloWorldByClass() { BeanFactory beanFactory = new ClassPathXmlApplicationContext("conf/conf-definition.xml"); HelloWorld helloWorld = beanFactory.getBean(HelloWorldImpl.class); helloWorld.sayHello(); } public static void sayHelloWorldByName() { BeanFactory beanFactory = new ClassPathXmlApplicationContext("conf/conf-definition.xml"); HelloWorld helloWorld = beanFactory.getBean("helloWorldByName", HelloWorld.class); helloWorld.sayHello(); } public static void sayHelloWorldByNameAndId() { BeanFactory beanFactory = new ClassPathXmlApplicationContext("conf/conf-definition.xml"); HelloWorld helloWorld = beanFactory.getBean("helloWorldById", HelloWorld.class); helloWorld.sayHello(); HelloWorld helloWorld01 = beanFactory.getBean("helloWorldByName01", HelloWorld.class); helloWorld01.sayHello(); } public static void sayHelloWorldMultiName() { BeanFactory beanFactory = new ClassPathXmlApplicationContext("conf/conf-definition.xml"); HelloWorld helloWorld = beanFactory.getBean("bean1", HelloWorld.class); helloWorld.sayHello(); HelloWorld bean11 = beanFactory.getBean("alias11",HelloWorld.class); bean11.sayHello(); HelloWorld bean12 = beanFactory.getBean("alias12",HelloWorld.class); bean12.sayHello(); HelloWorld bean13 = beanFactory.getBean("alias13",HelloWorld.class); bean13.sayHello(); HelloWorld bean2 = beanFactory.getBean("bean2",HelloWorld.class); bean2.sayHello(); HelloWorld bean21 = beanFactory.getBean("alias21",HelloWorld.class); bean21.sayHello(); HelloWorld bean22 = beanFactory.getBean("alias22",HelloWorld.class); bean22.sayHello(); HelloWorld bean23 = beanFactory.getBean("alias23",HelloWorld.class); bean23.sayHello(); } public static void sayHelloWorldByAlias() { //配置文件加载以及IOC容器启动 BeanFactory beanFactory = new ClassPathXmlApplicationContext("conf/conf-definition.xml"); //通过别名获取bean实例 HelloWorld bean3 = beanFactory.getBean("bean3", HelloWorld.class); //利用bean实例输出helloworld信息 bean3.sayHello(); HelloWorld bean31 = beanFactory.getBean("alias31",HelloWorld.class); bean31.sayHello(); HelloWorld bean32 = beanFactory.getBean("alias32",HelloWorld.class); bean32.sayHello(); HelloWorld bean33 = beanFactory.getBean("alias33",HelloWorld.class); bean33.sayHello(); }} |
