Spring--Bean scope
singleton, prototype,request, session, global session
bean.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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean name="u" class="com.bjsxt.dao.impl.UserDAOImpl"> </bean> <bean id="userService" class="com.bjsxt.service.UserService" scope="prototype"> <property name="userDAO" ref="u" /> </bean> </beans>
UserServiceTest.java:
package com.bjsxt.service; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.bjsxt.model.User; //Dependency Injection //Inverse of Control public class UserServiceTest { @Test public void testAdd() throws Exception { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml"); UserService service = (UserService)ctx.getBean("userService"); UserService service2 = (UserService)ctx.getBean("userService"); System.out.println(service == service2); } }
结果:false
xml改成singleton结果就是true