Bean

Posted 2021-03-09 tujw

配置bean对象

<?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.xsd">
    <bean id="UserService" class="com.spring.service.impl.UserServiceImpl" scope="prototype">
        <!-- 构造方法注入 -->
        <constructor-arg name="name" value="tujiawei"></constructor-arg>
        <constructor-arg name="age" value="18"></constructor-arg>
        <!-- 
            除基本类型和String 
        -->
        <constructor-arg name="birtyday" ref="now"></constructor-arg>
    </bean>
    <bean id="now" class="java.util.Date"></bean>
    
    <!-- set 方法注入 -->
    <bean id="UserService" class="com.spring.service.impl.UserServiceImpl" scope="prototype">
        <property name="age" value="20"></property>
        <property name="name" value="tujiawei"></property>
    </bean>
    <bean id="now" class="java.util.Date"></bean>
</beans>

获取对象

ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
IUserService us = ac.getBean("UserService", IUserService.class);