sxd-spring-21扩展

重写initPropertySources方法@Overrideprotected void initPropertySources() {super.initPropertySources();System.out.println(\"my initPropertySources\");getEnvironment().setRequiredProperties(\"aaa\");// 手动增加环境属性。。需要自定义 MyPropertySourceMyContext myContext = new MyContext();myContext.addElement(\"aaa\

自定义扫描类加载bd可实现动态加载bd

环境变量的提前检查

public class MyClassPathXmlApplicationContext extends ClassPathXmlApplicationContext {public MyClassPathXmlApplicationContext(String... configLocations) {super(configLocations);}/** * 拓展资源加载的实现，手动添加属性值 * AbstractApplicationContext#prepareRefresh() => initPropertySources() */@Overrideprotected void initPropertySources() {super.initPropertySources();System.out.println(\"my initPropertySources\");getEnvironment().setRequiredProperties(\"aaa\");// 手动增加环境属性。。需要自定义 MyPropertySourceMyContext myContext = new MyContext();myContext.addElement(\"aaa\

自定义的时候 传入registernew ClassPathBeanDefinitionScanner(registry)

新增自定义环境变量、新增校验环境变量的校验

自定义增删改beandefinitioninvokeBeanFactoryPostProcessors

完整代码-- xml <bean class=\"com.sunxd.extend.selfBeanDefinitionRegistryPostProcessor.MyBeanDefinitionRegistryPostProcessor\" /><context:component-scan base-package=\"com.sunxd.extend.selfBeanDefinitionRegistryPostProcessor.scan\"/>-- javapublic class MyBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {@Overridepublic void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {RootBeanDefinition rootBeanDefinition1 = new RootBeanDefinition(ControllerTest.class);registry.registerBeanDefinition(\"controllerTest\

新建类 MyClassPathXmlApplicationContext extends ClassPathXmlApplicationContext

带注解需要依赖注入的 ，手动注册完所有的bean，否则找不到依赖的bean- 实现  BeanDefinitionRegistryPostProcessor重写 postProcessBeanDefinitionRegistry 方法xml 引入 component-san bean

总结=》spring扩展点

普通bean- 实现  BeanDefinitionRegistryPostProcessor重写 postProcessBeanDefinitionRegistry 方法

注册扫描路径的类- 实现  BeanDefinitionRegistryPostProcessor重写 postProcessBeanDefinitionRegistry 方法xml 引入 component-san bean

ClassPathBeanDefinitionScanner

完整代码-- xml <bean class=\"com.sunxd.extend.selfBeanDefinitionRegistryPostProcessor.MyBeanDefinitionRegistryPostProcessor\" /><context:component-scan base-package=\"com.sunxd.extend.selfBeanDefinitionRegistryPostProcessor.scan\"/>-- javapublic class MyBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {@Overridepublic void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {boolean useDefaultFilters = false;//是否使用默认的filter，使用默认的filter意味着只扫描那些类上拥有Component、Service、Repository或Controller注解的类。String basePackage = \"com.sunxd.extend.selfBeanDefinitionRegistryPostProcessor.bean\

readerContext.getRegistry() ->  DefaultListableBeanFactory useDefaultFilters -> truereaderContext.getEnvironment() -> 系统启动时加载的environmentreaderContext.getResourceLoader() -> 启动类 ClasspathXmlApplicationContenxt

prepareRefresh

完整代码-- xml <bean class=\"com.sunxd.extend.selfBeanDefinitionRegistryPostProcessor.MyBeanDefinitionRegistryPostProcessor\" />-- javapublic class MyBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {@Overridepublic void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {RootBeanDefinition rootBeanDefinition = new RootBeanDefinition(CommonBean.class);registry.registerBeanDefinition(\"commonBean\