Spring Bean管理--注解方式——（五）

文章目录

Spring2.5引入使用注解定义Bean

@Component 描述Spring框架中的Bean

@Repository用于对DAO实现类进行标注

@Service用于对Service实现类进行标注

@Controller用于对Controller实现类进行标注

找文档： spring-framework-4.2.4.RELEASE/docs/spring-framework-reference/html/xsd-configuration.html 找到下面的，40.2.8the context schema

<?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:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- bean definitions here --> <!--开启注解扫描--> <context:component-scan base-packge="xx包名"/> </beans>

新建UserService类

/** * Spring的Bean管理的注解方式： * * 传统方式需要去XML中配置<bean id="" class=""></bean> */ @Component("userService") public class UserService { public String sayHello(String name){ return "Hello" + name; } }

新建测试类

@Test public void demo1(){ ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml"); UserService userService = (UserService) applicationContext.getBean("userService"); String s = userService.sayHello("张三"); System.out.println(s); }