/*
 如果將要訪問的靜態資源放在專案的類路徑下面即配置為"classpath:/BookPicture/"那麼當該路徑下的資      源發生變化時是不立即生效的，即只有重啟後才能訪問到變化的資源；
 解決辦法將靜態資源放在非專案類路徑下即可 "file:F:/bookpicture/");即下面這句
  registry.addResourceHandler("/bookpicture/**").addResourceLocations("file:C:/bookpicture/"); 
*/
@Configuration
public class StateResourceConfigurer extends
 
 WebMvcConfigurerAdapter{
    /**
     * 配置訪問靜態資源
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry){
        registry.addResourceHandler("/bookpicture/**").addResourceLocations("classpath:/BookPicture/");
        super.addResourceHandlers(registry);
    }
}