spring工厂

更多获取方式看 spring的获取容器中的bean
按名字, 注解, 继承, 接口等等各种方式获取

定义

@Service("commandToolFactory")
public class CommandToolFactory implements ApplicationContextAware, InitializingBean {
  private Map<String, CommandToolHandler> handlerMap;
  private ApplicationContext applicationContext;
  @Override
  public void afterPropertiesSet() throws Exception {
    final Map<String, CommandToolHandler> handlerMap =
        this.applicationContext.getBeansOfType(CommandToolHandler.class);
    this.handlerMap = handlerMap;
  }
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext;
  }
  public CommandToolHandler getToolHandler(String cate) {
    return this.handlerMap.get(cate + "ToolHandler");
  }
}

目标的类是 NormalToolHandler
使用

@Autowired
private CommandToolFactory commandToolFactory;
CommandToolHandler handler = this.commandToolFactory.getToolHandler(orderType.getKey());