标签：tcl 开发 throw sele ada str 转换器 sed lse
ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
（2）注解：带有@Configuration注解的类（配置类）
//配置类，相当于applicationContext.xml
@Configuration
public class MyConfig {
@Bean //id=方法名（myStudent）
public Student myStudent(){
Student student=new Student(2,"fg",34);
return student;
}
}
取bean:
ApplicationContext context=new AnnotationConfigApplicationContext(MyConfig.class);
Student myStudent = (Student) context.getBean("myStudent");
<context:component-scan base-package="org.ghl.controller"></context:component-scan>
排除：
@ComponentScan(value = "org.ghl",excludeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION ,value = {Service.class,Repository.class})})
包含：（有默认行为，可以通过useDefaultFilters禁止）
@ComponentScan(value = "org.ghl",includeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION ,value = {Service.class,Repository.class})},useDefaultFilters = false)
ASSIGNABLE_TYPE：指具体的类。
@ComponentScan(value = "org.ghl",includeFilters = {@ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE ,value = {StudentController.class})},useDefaultFilters = false)
@ComponentScan(value = "org.ghl",includeFilters = {@ComponentScan.Filter(type = FilterType.CUSTOM ,value = {MyFilter.class})},useDefaultFilters = false)
public class MyFilter implements TypeFilter {
@Override
public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) throws IOException {
ClassMetadata classMetadata = metadataReader.getClassMetadata();
//拿到扫描器value = "org.ghl"包中的所有标有三层组件注解类的名字
String className = classMetadata.getClassName();
//只过滤出和student相关的三层组件
if (className.contains("Student")){
return true; //表示包含
}
return false; //表示排除
}
}
public class MyImportSelector implements ImportSelector {
@Override
public String[] selectImports(AnnotationMetadata annotationMetadata) {
return new String[]{"org.ghl.entity.Apple","org.ghl.entity.Banana"}; //方法的返回值就是要纳入IOC容器的Bean
}
}
@Import({MyImportSelector.class})
（3）编写ImporBeanDefinitionRegistrar接口的实现类并重写方法。
public class MyImporBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {
@Override
public void registerBeanDefinitions(AnnotationMetadata annotationMetadata, BeanDefinitionRegistry beanDefinitionRegistry) {
//BeanDefinition beanDefinition=new RootBeanDefinition(Orange.class);
BeanDefinition beanDefinition=new RootBeanDefinition("org.ghl.entity.Orange");
beanDefinitionRegistry.registerBeanDefinition("myorange",beanDefinition);
}
}
@Import({MyImporBeanDefinitionRegistrar.class})
public class MyFactoryBean implements FactoryBean{
@Override
public Object getObject() throws Exception {
return new Apple();
}
@Override
public Class<?> getObjectType() {
return Apple.class;
}
@Override
public boolean isSingleton() {
return true;
}
}
2.注册到@Bean中
@Bean
public FactoryBean<Apple> myFactoryBean(){
return new MyFactoryBean();
}
注意：需要通过&区分获取的对象是哪一个。不加&，获取的是最内部真实的apple，如果加&，获取的是FactoryBean。
标签：tcl 开发 throw sele ada str 转换器 sed lse
原文地址：https://www.cnblogs.com/ghlz/p/13191225.html
