Spring

xiaoxiao2021-02-28  135

导入jar包

4+1 : 4个核心(beans, core , context ,  expression) + 1个依赖(commons-loggins.jar)

目标类

提供UserService接口和实现类 package com.itheima.a_ioc; public interface UserService { public void addUser() ; } package com.itheima.a_ioc; public class UserServiceImpl implements UserService{ // @Override public void addUser(){ System.out.println("a_Ioc add user"); } } 获得UserService实现类的实例(从Spring工厂获得,需要将实现类的全限定名称配置到xml文件)

配置文件

位置:任意, 开发中一般在classpath下(src) 名称:任意, 开发中常用 applicationContext.xml 内容: 添加Schema约束 + 配置Service <?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 definitions here --> <bean id = "UserServiceImplId" class = "com.itheima.a_ioc.UserServiceImpl" ></bean> </beans>

测试

获得容器+ 获得内容 package com.itheima.a_ioc; import org.apache.catalina.core.ApplicationContext; import org.junit.Test; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestIoc { @Test public void demo02(){ String xmlPath = "com/itheima/a_ioc/beans.xml" ; ClassPathXmlApplicationContext a = new ClassPathXmlApplicationContext(xmlPath); UserService userService = (UserService) a.getBean("UserServiceImplId") ; userService.addUser(); } }
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