Spring源码学习01

2020年6月29日

1. 配置类 注解@Configruation

2. 注解扫描,通过注解@ComponentScans,扫描指定的包.

   package com.wzl.yanyan.spring01;
   
   import com.wzl.yanyan.Person;
   import com.wzl.yanyan.spring01.filter.MyFilterType;
   import com.wzl.yanyan.spring01.service.SpringService;
   import org.springframework.context.annotation.*;
   import org.springframework.stereotype.Controller;
   
   @Configuration
   //@ComponentScan(value = "com.wzl.yanyan",
   //        excludeFilters ={@ComponentScan.Filter(type = FilterType.ANNOTATION,classes = {Controller.class})} )
   //
   @ComponentScans(value = {
           @ComponentScan(value = "com.wzl.yanyan",
           includeFilters ={
   //                @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = {Controller.class}),
   //                @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE,classes = {SpringService.class})} ,
                   @ComponentScan.Filter(type = FilterType.CUSTOM,value = {MyFilterType.class})},
           useDefaultFilters = false)})
   // 查看注解,以及用法
   // 使用 includeFilters,或者 excludeFilters,
   public class MainConfig {
   
       /**
        *  默认方法名称作为ID
        * @return Person
        */
       @Bean("persons")
       public Person personConfig(){
           return new Person("config",21);
       }
   }
   

3. bean的作用域,如果默认是单例的.会直接创建Bean

4. 懒加载是针对 singleton