如何在Spring中使用编码方式动态配置Bean详解

public class BookService {
 BookDao bookDao;
 public void setBookDao(BookDao bookDao) {
 this.bookDao = bookDao;
 }

 public BookDao getBookDao() {
 return bookDao;
 }
}

@Component
public class BookServiceFactoryBean implements BeanFactoryPostProcessor {
 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
 DefaultListableBeanFactory factory = (DefaultListableBeanFactory) beanFactory;

 //Bean 定义
 BeanDefinitionBuilder builder=BeanDefinitionBuilder.genericBeanDefinition
  (BookService.class);

 //设置属性
 builder.addPropertyReference("bookDao","bookDao");

 //注册 Bean 定义
 factory.registerBeanDefinition("bookService1",builder.getRawBeanDefinition());

 //注册 Bean 实例
 factory.registerSingleton("bookService2",new net.deniro.spring4.dynamic.BookService());
 }
}

BookService bookService1 = (BookService) context.getBean("bookService1");
assertNotNull(bookService1);
assertNotNull(bookService1.getBookDao());

BookService bookService2 = (BookService) context.getBean("bookService2");
assertNotNull(bookService2);

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public class BookServiceDefinitionParser implements BeanDefinitionParser {
 public BeanDefinition parse(Element element, ParserContext parserContext) {
  //创建 Bean 定义
  BeanDefinitionBuilder builder=BeanDefinitionBuilder.genericBeanDefinition
    (BookService.class);

  //注入自定义的标签属性
  String dao=element.getAttribute("dao");
  builder.addPropertyReference("bookDao",dao);

  //注册 Bean 定义
  parserContext.registerBeanComponent(new BeanComponentDefinition(builder
    .getRawBeanDefinition(),"bookService"));
  return null;
 }
}

public class BookServiceNamespaceHandler extends NamespaceHandlerSupport {
 public void init() {
  registerBeanDefinitionParser("book-service",new BookServiceDefinitionParser());
 }
}

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