Spring基础(9) : 自动扫描
一 配置xml方式:扫描com包下的bean
<?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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com"/> </beans>
com包下一个类:
@Component @PropertySource("p.properties") public class Person { @Value("${name}") public String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
resource下 p.properties中的文件内容:
name=hahadaxiao
main函数:
public static void main(String[] args){
ApplicationContext context = new ClassPathXmlApplicationContext("a.xml");
Person p = context.getBean("person",Person.class);
System.out.println(p.name);
}
打印:
hahadaxiao
二 注解方式
com包下存在下面这个类,默认扫描Config1所在的包下的Bean
@Configuration @ComponentScan public class Config1 { }
@Component @PropertySource("p.properties") public class Person { @Value("${name}") public String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }
public static void main(String[] args){ ApplicationContext context = new AnnotationConfigApplicationContext(Config1.class); Person p = context.getBean("person",Person.class); System.out.println(p.name); }
打印:
hahadaxiao