标签：
学Spring框架必须理解控制反转和依赖注入。下面各自举一个例子，来说明。
IOC(控制反转):应用本身创建和维护的依赖对象；现在交由外部容器(Spring)来创建和维护；这个控制权的转移；
就叫做控制反转。
第一步：配置applicationContextcreateproject.xml和applicationcontext.xml（总体）
<?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:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="create" class="createObject.CreateHelloWorld" factory-method="create"> </bean> </beans>
<?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:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <!-- 引用其他配置文件 --> <import resource="createObject/applicationContextcreateproject.xml"/> </beans>
package createObject; public class CreateHelloWorld { //静态工厂 public static HelloWord create(){ return new HelloWord(); } }
package createObject; public class HelloWord { public void hellow(){ System.out.print("hellow spring"); } }
测试类：
package createObject; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class texthell{ public static void main(String[] args) { // TODO Auto-generated method stub //加载配置文件 ApplicationContext context=new ClassPathXmlApplicationContext("applicationcontext.xml"); HelloWord te=(HelloWord) context.getBean("create"); te.hellow(); } }
效果图：
DI(依赖注入):（控制反转的一个实现）在程序运行期间；动态的将依赖对象注入到组件当中（创建对象）new的工作交给spring来做；前提留接口;set get方法
第一步：配置Springapplicationcontext.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" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="wanlix" class="com.Test.test"> <property name="name" value="张嘎"/> <property name="speak" value="一天不打黄鼠狼，就憋屈"/> </bean> </beans>
第二步：测试类
package com.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class test { public String name; public String speak; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSpeak() { return speak; } public void setSpeak(String speak) { this.speak = speak; } public static void main(String[] args) { ApplicationContext context=new ClassPathXmlApplicationContext("applicationcontext.xml"); test te=(test) context.getBean("wanlix"); System.out.print(te.getName()+"说:"+te.getSpeak()); } }
效果图：
标签：
原文地址：http://www.cnblogs.com/wlx520/p/4728300.html
