Mybatis源码---重写一个最简单的Mybatis架构实现（二）

     前言：经过不蟹的努力，终于把Mybatis和Spring结合的代码也给整合进来啦！此处应有掌声，真的，感觉自己一下子进入了另一种天地。话不多说，代码奉上  。这三段代码，就是mybatis和spring整合的核心代码了。

1.  第一步，编写一个类似与MapperFactoryBean的类用来提供Fisher接口的代理类，代码如下：

public class FisherFactoryBean implements FactoryBean {

	private Class fishInterface;

	private boolean addToConfig = true;

	private FishingRod rod;

	public FisherFactoryBean() {

	}

	public FisherFactoryBean(Class fishInterface) {
		this.fishInterface = fishInterface;
	}

	public T getObject() throws Exception {
		return getFishingRod().getFishinger(this.fishInterface);
	}
    
       //注入FishingFactory，并设置FishingRod
	private FishingRod getFishingRod() {
		if (this.rod == null) {
			FishingFactory factory = new DefaultFishingerFactory();
			this.rod = factory.getFishingRod();
		}
		return this.rod;
	}

	public Class getObjectType() {
		return this.fishInterface;
	}

	public boolean isSingleton() {
		return true;
	}

	public void setMapperInterface(Class fishInterface) {
		this.fishInterface = fishInterface;
	}

	public Class getMapperInterface() {
		return fishInterface;
	}

	public void setAddToConfig(boolean addToConfig) {
		this.addToConfig = addToConfig;
	}

	public boolean isAddToConfig() {
		return addToConfig;
	}
}

 2. 一个类似MapperScannerConfigurer的类，用来在Bean定义完，初始化前替换Spring容器中的Fisher接口的BeanDefinitions：

@Component
public class FishingConfigurer implements BeanDefinitionRegistryPostProcessor, InitializingBean, ApplicationContextAware, BeanNameAware{
   
	private String basePackage = "com.demo.fisher";
	private Class annotationClass = Fisher.class;
	private ResourceLoader applicationContext;
	private BeanNameGenerator nameGenerator;
	private Class markerInterface;

	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
		
	}

	public void setBeanName(String name) {
		
	}

	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		this.applicationContext = applicationContext;
	}

	public void afterPropertiesSet() throws Exception {
		System.out.println("");
	}

	public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
		ClassPathFisherScanner scanner = new ClassPathFisherScanner(registry);
		scanner.setMarkerInterface(this.markerInterface);
		scanner.setAnnotationClass(this.annotationClass );
		scanner.setResourceLoader(this.applicationContext);
	    scanner.setBeanNameGenerator(this.nameGenerator);
	    scanner.registerFilters();
	    scanner.scan(new String[]{this.basePackage}); 
	}

}

注意此处用@Component来声明了，不然Spring不会扫描到这个类。

3.一个仿ClassPathMapperScanner的类，用来扫描和将Fisher接口的BeanDefinition替换为代理类

public class ClassPathFisherScanner extends ClassPathBeanDefinitionScanner {

	private boolean addToConfig = true;

	private Class annotationClass;

	private Class markerInterface;

	private FisherFactoryBean fisherFactoryBean = new FisherFactoryBean