java - 网络配置 : use @bean or method way?

Question

我知道我可以这样在 webConfig 类中编写:

@Override
public void configureViewResolvers(ViewResolverRegistry registry) {
    InternalResourceViewResolver viewResolver=new InternalResourceViewResolver();

    viewResolver.setPrefix("/WEB-INF/pages/");
    viewResolver.setSuffix(".jsp");

    registry.viewResolver(viewResolver);
}

但同时 - 我可以用另一种方式写:

 @Bean(name = "viewResolver")
public ViewResolver getViewResolver() {
    InternalResourceViewResolver viewResolver=new InternalResourceViewResolver();

    viewResolver.setPrefix("/WEB-INF/pages/");
    viewResolver.setSuffix(".jsp");

    return viewResolver;
}

哪种方式更好？

为什么我不能为 freemarker 做第一种方法，但可以做第二种:

正确的是:

@Bean(name = "viewResolver")
public ViewResolver getViewResolver() {
    FreeMarkerViewResolver viewResolver = new FreeMarkerViewResolver();
    viewResolver.setPrefix("");
    viewResolver.setSuffix(".ftl");
    return viewResolver;
}


@Bean(name = "freemarkerConfig")
public FreeMarkerConfigurer getFreemarkerConfig() {
    FreeMarkerConfigurer config = new FreeMarkerConfigurer();
    config.setTemplateLoaderPath("/WEB-INF/pages/");
    return config;
}

我无法编写方法，因为我不知道 FreeMarkerConfigurer 和 FreeMarkerViewResolver 如何交互...

Answer 1

基本上，您的第二种用法不是您应该如何使用ViewResolverRegistry，它有一些方法可以让生活更轻松，例如jsp或freeMarker，其中你应该使用。

所以正确的使用是

Override
public void configureViewResolvers(ViewResolverRegistry registry) {
  registry.jsp("/WEB-INF/pages/", ".jsp");

}

对于 FreeMarker

public void configureViewResolvers(ViewResolverRegistry registry) {
  registry.freeMarker(); 

}

@Bean
public FreeMarkerConfigurer freemarkerConfig() {
    FreeMarkerConfigurer config = new FreeMarkerConfigurer();
    config.setTemplateLoaderPath("/WEB-INF/pages/");
    return config;
}

您仍然需要 FreeMarkerConfigurer 来引导和配置 FreeMarker。