Spring-framework

1、spring注解驱动开发 官方文档

• @Configuration 告诉spring这是一个配置类，配置类=配置文件
• @Bean 给容器中注入一个bean，类型为返回值类型，id默认用方法名作为id

@Bean
public Person person(){
       return new Person("Jack",22);
     }

• 获取bean

ApplicationContext applicationContext = new  AnnotationConfigApplicationContext(MainConfig.class);
Person person = applicationContext.getBean(Person.class);
System.out.println("person:"+person);

• 获取容器中bean数组：String[] names = applicationContext.getBeanDefinitionNames();
• @ComponentScan(value = "com.hbut") 包扫描器，指定要扫描的包。配置在配置类上面。

  @ComponentScan(value = "com.hbut",excludeFilters = {@ComponentScan.Filter(type =FilterType.ANNOTATION,classes = {Controller.class, Service.class})})  //包扫描，按注解排除,排除Controller和service
  @ComponentScan(value = "com.hbut",includeFilters = {@ComponentScan.Filter(type =FilterType.ANNOTATION,classes = {Controller.class, Service.class})},useDefaultFilters =false) // 包扫描，只需要service和controller