IOC(控制反轉,Inversion of Control),一種思想,並非特定的技術,本文以spring中的IOC爲例
基本介紹:
1,類的創建不再主動使用new來創建,而是使用配置文件來創建
2,IOC操作的兩中方式:配置文件的方式,註解的方式
IOC的基本原理:
1,xml配置文件
2,dom4j解析xml文件
3,工廠的設計模式
4,反射
案例:
<?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.xsd">
<!-- bean definitions here -->
<!--ioc base knowledge,new bean 3 ways-->
<!--1,use default no param constructor method-->
<bean id="user" class="com.sohu.zzy.spring.ioc.User"></bean>
<!--2.use bean factory new bean-->
<bean id="bean2" class="com.sohu.zzy.spring.bean.Bean2Factory" factory-method="getBean2"></bean>
<!--3,use instance factory new bean-->
<bean id="bean3factory" class="com.sohu.zzy.spring.bean.Bean3Factory"></bean>
<bean id="bean3" factory-bean="bean3factory" factory-method="getBean3"></bean>
<!--使用有參構造注入屬性值-->
<bean id="student1" class="com.sohu.zzy.spring.ioc.Student">
<constructor-arg name="name" value="zzy"></constructor-arg>
<constructor-arg name="age" value="23"></constructor-arg>
</bean>
<!--使用set方法進行屬性注入-->
<bean id="student2" class="com.sohu.zzy.spring.ioc.Student">
<property name="name" value="asdf"></property>
</bean>
<!--將對象作爲屬性注入另一個對象-->
<bean id="studentdao" class="com.sohu.zzy.spring.ioc.studentDao"></bean>
<bean id="studentservice" class="com.sohu.zzy.spring.ioc.studentService">
<!--注入dao對象,此時不用value,而是用ref,name 爲屬性名稱-->
<property name="studentDao" ref="studentdao"></property>
</bean>
<!--p名稱空間-->
<bean id="studentp" class="com.sohu.zzy.spring.ioc.Student" p:name="asdfa"></bean>
<bean id="studentp2" class="com.sohu.zzy.spring.ioc.Student" >
<!--數組-->
<property name="args">
<list>
<value>array1</value>
<value>array2</value>
<value>array3</value>
</list>
</property>
<!--list-->
<property name="list">
<list>
<value>list1</value>
<value>list2</value>
<value>list3</value>
</list>
</property>
<!--map-->
<property name="map">
<map>
<entry key="a" value="asdf"></entry>
<entry key="b" value="asdf"></entry>
<entry key="c" value="asdf"></entry>
</map>
</property>
<!--properties-->
<property name="properties">
<props>
<prop key="driverclass">com.mysql.jdbc.Driver</prop>
<prop key="username">asdfasdf</prop>
<prop key="password">123asdf</prop>
</props>
</property>
</bean>
</beans>