mybatis与spring整合之MapperScannerConfigurer-优快云博客

本文链接：https://blog.youkuaiyun.com/u012415194/article/details/84911051

本文详细解析了MyBatis中Mapper接口的扫描与注册过程，包括如何通过BeanDefinitionRegistryPostProcessor实现Bean定义的注册，以及ClassPathMapperScanner的具体配置与使用方法。

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//实现了BeanDefinitionRegistryPostProcessor和InitializingBean接口
//所以首先会调用
//判空扫描的包
public void afterPropertiesSet() throws Exception {
    notNull(this.basePackage, "Property 'basePackage' is required");
  }


//然后调用
 public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
    if (this.processPropertyPlaceHolders) {
      processPropertyPlaceHolders();
    }

    ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry);
    scanner.setAddToConfig(this.addToConfig);
    scanner.setAnnotationClass(this.annotationClass);
    scanner.setMarkerInterface(this.markerInterface);
    scanner.setSqlSessionFactory(this.sqlSessionFactory);
    scanner.setSqlSessionTemplate(this.sqlSessionTemplate);
    scanner.setSqlSessionFactoryBeanName(this.sqlSessionFactoryBeanName);
    scanner.setSqlSessionTemplateBeanName(this.sqlSessionTemplateBeanName);
    scanner.setResourceLoader(this.applicationContext);
    scanner.setBeanNameGenerator(this.nameGenerator);
    scanner.registerFilters();
    //扫描注册BeanDefinition,需要注意的是这里扫描注册的beanClass是MapperFactoryBean。definition.setBeanClass(MapperFactoryBean.class);
    scanner.scan(StringUtils.tokenizeToStringArray(this.basePackage, ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS));
  }


 //最后调用
 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
    // left intentionally blank
  }

  /** 该类就是扫描mapper所在的package,然后注册到BeanDefinitionRegistry中。交由spring的finishBeanFactoryInitialization(beanFactory);
  方法来加载bean。*/