java这意味着什么：如果没有返回模型，就不会呈现视图？

Question

Spring MVC's documentation states

If a model is returned, the view is rendered. If no model is returned (maybe due to a preprocessor or postprocessor intercepting the request, perhaps for security reasons), no view is rendered, because the request could already have been fulfilled.

这是什么意思

Answer 1

简单地说，如果没有返回视图页面的值，可能被某些安全性阻止，任何可以阻止或拦截该响应的东西（例如CSRF），IntenalViewResolver将不会为您呈现任何内容。 这进一步告诉您，如果特定的@RequestMapping URL不返回视图页面值，则不会呈现任何内容。 InternalViewResolver呈现视图的唯一方法是返回视图名称，并且在该过程中不会被阻止