WebConfig:使用@bean或方法方式?

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);
}

但与此同时 - 我可以用另一种方式写这个：

@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？

以及为什么我不能为freemarker做第一种方法，但可以做第二种方式：

这是正确的：

@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;
}

方法方式我不能写，因为我不知道FreeMarkerConfigurer和FreeMarkerViewResolver如何交互...

Answer 1

基本上你的第二个用法不是你应该如何使用ViewResolverRegistry它有一些方法可以让生活更轻松，比如你应该使用jsp或freeMarker。

所以正确的用法是

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

和免费标记

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。