java - 混淆 WebMvcConfigurationSupport 和 WebMvcConfigurerAdapter

Question

我想在 Windows 中使用 WebMvcConfigurerAdapter 添加资源处理程序，但在 Linux 中它不起作用，所以我添加了 WebMvcConfigurationSupport。

调试和测试后我发现两个bean将在两个操作系统中创建，但是WebMvcConfigurerAdapter的覆盖功能将只在Windows上执行，WebMvcConfigurationSupport的覆盖功能将仅在 Linux 上执行。

我找不到原因。两个配置类如下所示:

@Configuration
public class JxWebAppConfigurer  extends WebMvcConfigurerAdapter {
   @Override
   public void addResourceHandlers(ResourceHandlerRegistry registry) {
     registry.addResourceHandler("/**").addResourceLocations("file:"+System.getProperty("user.dir")+"/src/main/webapp/");
     super.addResourceHandlers(registry);
   }
}

这是另一个:

@Configuration
public class JxWebConfiguration extends WebMvcConfigurationSupport {
  @Override
  public void addResourceHandlers(ResourceHandlerRegistry registry) {
       registry.addResourceHandler("/**").addResourceLocations("file:"+System.getProperty("user.dir")+"/src/main/webapp/");
       super.addResourceHandlers(registry);
   }
}

@EnalbeMvc 已经添加到主类

Answer 1

如前所述in the @EnableWebMvc Documentation :

Adding this annotation to an @Configuration class imports the Spring MVC configuration from WebMvcConfigurationSupport

{..}

To customize the imported configuration, implement the interface WebMvcConfigurer or more likely extend the empty method base class WebMvcConfigurerAdapter and override individual methods

{..}

If WebMvcConfigurer does not expose some advanced setting that needs to be configured, consider removing the @EnableWebMvc annotation and extending directly from WebMvcConfigurationSupport

所以实际上要么:

1. @EnableWebMvc + extending WebMvcConfigurerAdapter(建议第一个选项)
2. 直接从 WebMvcConfigurationSupport 扩展(完全控制的回退替代方案)

(两种情况都需要@Configuration)