java - SpringMVC 中 WebApplicationInitializer 没有被加载

Question

我在使用 SpringMVC 中的 AbstractAnnotationConfigDispatcherServletInitializer 来实现使用 java 配置 servlet。

我在访问 localhost:8080/ 出现的是 404 错误，下面是相关代码

WebAppInitializer

public class SpittrWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class<?>[]{ WebConfig.class };
    }

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class<?>[]{ RootConfig.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

WebConfig

@Configuration
@EnableWebMvc
@ComponentScan("spittr.web")
public class WebConfig extends WebMvcConfigurerAdapter{
    @Bean
    public ViewResolver viewResolver(){
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setExposeContextBeansAsAttributes(true);
        return resolver;
    }
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
}

HomeController

@Controller
public class HomeController {
    @RequestMapping(value = "/",method = GET)
    public String home(){
        return "home";
    }
}

home.jsp 文件在 WEB-INF/views/ 下

Maven

 <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version> 4.1.5.RELEASE</version>
            <exclusions>
                <exclusion>
                    <groupId>commons-logging</groupId>
                    <artifactId>commons-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        ...
    </dependencies>

请问一下，为什么我在访问 `localhost:8080/` 出现的是 404 错误

Answer 1

I found the answer... When Intellij IDEA 在导出 artfacts, I derived this structure:

artfacts/
        --/ META-INF
        --/ WEB-INF
          --/ veiws
            --/ home.jsp
          --/ classes
            --/(class文件)

Refer to Tomcat 7.0 Standard Directory Layout to find out.

Not here /WEB-INF/lib This folder is used to contain dependency packages required for compilation... The project is not automatically configured for you...

And the exported artfacts has not yet reported an error message...

Go to Project Structure to change the content of out_put yourself, and put the dependency package under Project Structure 内去改变 out_put 的内容，将依赖包放入 /WEB-INF/lib...