对于静态资源位置，使用@EnableWebMvc和WebMvcConfigurerAdapter进行Spring MVC配置会导致“ forward：”问题。和“重定向：” [英] Spring MVC configuration with @EnableWebMvc and WebMvcConfigurerAdapter for static resources location causes problems with "forward:" and "redirect:"

问题描述

我有一个适用于Web的Spring Boot问候世界，并对配置有些困惑：

I have a Spring Boot hello world for web and some confusion with configuration:

Spring版本：1.2.6.RELEASE

Spring version: 1.2.6.RELEASE

我的项目结构：

我需要提供一些静态内容，因此我决定在一些自定义的 WebConfig 类中（出于研究目的）重新定义此类内容的源目录：

I need to supply some static content so I decided to redefine the source directory for this type of content in some custom WebConfig class (for study purposes):

Javadoc for @EnableWebMvc 说：

Javadoc for @EnableWebMvc say:

将此注释添加到@Configuration类可从WebMvcConfigurationSupport导入Spring
MVC配置

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

要自定义导入的配置，请实现接口
WebMvcConfigurer或更可能扩展空方法基类
WebMvcConfigurerAdapter并覆盖单个方法，例如：

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

因此诞生了下一个配置类：

So the next configuration-class was born:

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/r/**").addResourceLocations("classpath:/static/r/");
        registry.addResourceHandler("/favicon.ico").addResourceLocations("classpath:/static/r/favicon.ico");
    }
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("forward:/r/diploma/index.html");
        registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
        super.addViewControllers(registry);
    }
}

如果运行该应用并尝试访问 http：// localhost：8080 /
我遇到下一个异常：

And if run the app and try to visit http://localhost:8080/ I get the next exception:

javax.servlet.ServletException: Could not resolve view with name 'forward:/r/diploma/index.html' in servlet with name 'dispatcherServlet'

但是如果我删除了 @EnableWebMvc 从WebConfig中，我在浏览器中找到了index.html。
那么，这种行为的原因是什么呢？

But if i remove the @EnableWebMvc from my WebConfig, I got my index.html in browser. So what is the reason of such behavior?

实际上，我有一个生产项目，以我为例进行研究，它同时具有 @EnableWebMvc & WebConfig 上的 WebMvcConfigurerAdapter 。

Actually I have a production project which I using as example to study and it has both @EnableWebMvc & WebMvcConfigurerAdapter on WebConfig.

推荐答案

您应该添加 ViewResolver 来解析 WebConfig 中的视图，如下所示：

You should add a ViewResolver to resolves your views in WebConfig, something like this:

@Bean
public InternalResourceViewResolver defaultViewResolver() {
    return new InternalResourceViewResolver();
}

添加 @EnableWebMvc ，您将关闭所有Spring Boot的网络自动配置，这将自动为您配置此类解析程序。通过删除注释，自动配置将再次打开，并且自动配置的 ViewResolver 解决了该问题。

When you're adding @EnableWebMvc, you're turning off all of the spring boot's web auto configurations, which automatically configures such a resolver for you. By removing the annotation, auto configuration will turn on again and the auto configurated ViewResolver solves the problem.

这篇关于对于静态资源位置，使用@EnableWebMvc和WebMvcConfigurerAdapter进行Spring MVC配置会导致“ forward：”问题。和“重定向：”的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！