spring 使用util:list节点 提取公共的bean
1. 配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!-- beans节点中的红色部分是我加的，否则报出“The matching wildcard is strict, but no declaration can be found for element util:list"错误--> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd"> <bean id="car" class="com.hxzy.model.Car"> <constructor-arg type="java.lang.String"> <value>宝马</value> </constructor-arg> <constructor-arg type="java.lang.String"> <value>天津</value> </constructor-arg> <constructor-arg type="int"> <value>200</value> </constructor-arg> </bean> <bean id="car2" class="com.hxzy.model.Car"> <constructor-arg type="java.lang.String"> <value>奔驰</value> </constructor-arg> <constructor-arg type="java.lang.String"> <value>北京</value> </constructor-arg> <constructor-arg type="int"> <value>220</value> </constructor-arg> </bean> <bean id="person2" class="com.hxzy.model.Person"> <property name="age" value="58"> </property> <property name="name" value="老刘"></property>
以下红色部分可以使用这句话替换
<property name="cars" ref="cars">
<property name="cars"> <list> <ref bean="car" /> <ref bean="car2" /> </list> </property>
</bean> <bean id="person4" class="com.hxzy.model.Person"> <property name="age" value="48"></property> <property name="name" value="夏洛"></property>
<!--此处调用了外部的cars bean--> <property name="cars" ref="cars"></property> </bean>
<!--此处即为抽出的cars集合bean--> <util:list id="cars"> <ref bean="car" /> <ref bean="car2" /> </util:list> <bean id="dataSource" class="com.hxzy.model.DataSource"> <property name="properties"> <props> <prop key="user">root</prop> <prop key="password">1234</prop> <prop key="jdbcUrl">jdbc:mysql:///test</prop> <prop key="driverClass">com.mysql.jdbc.Driver</prop> </props> </property> </bean> </beans>
