SpringMvc4.2.5 零配置出现 No mapping found for HTTP request with URI（转）

原文地址：SpringMvc4.2.5 零配置出现 No mapping found for HTTP request with URI

public class WebInitializer implements WebApplicationInitializer {

    private static final Logger logger = LogManager.getLogger(WebInitializer.class);

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {

        logger.info("-------->启动web应用");

        /*
         *  Log4jConfigListener: log4j 2日志配置，配置文件为 classpath:log4j2.xml
         */
        servletContext.addListener(new Log4jServletContextListener()); 

        Log4jServletFilter log4jServletFilter = new Log4jServletFilter();
        servletContext.addFilter("log4jServletFilter", log4jServletFilter);

        /*
         *  OpenSessionInViewFilter: 加上该 filter 可以保证jackson能够序列化LAZY FetchType
         */
        OpenSessionInViewFilter openSessionInViewFilter = new OpenSessionInViewFilter();
        FilterRegistration.Dynamic openSessionInViewFilterRegistration = servletContext
                .addFilter("openSessionInViewFilter", openSessionInViewFilter);
        //指定在spring配置的sessionFactory
        openSessionInViewFilterRegistration.setInitParameter("sessionFactoryBeanName", "sessionFactory");
        //singleSession默认为true,若设为false则等于没用OpenSessionInView
        openSessionInViewFilterRegistration.setInitParameter("singleSession", "true");
        openSessionInViewFilterRegistration.addMappingForUrlPatterns(
                EnumSet.of(DispatcherType.REQUEST, DispatcherType.FORWARD, DispatcherType.INCLUDE), false, "/");  

        ServerParameter params = ServerParameter.getInstance();
        DBMananger.loadEnv();
        if(DBMananger.connDB()) {       // 数据库连接成功，再载入APP配置
            params.addAttribute("connDBSataus", true);
            /*
             * spring mvc 外的配置 AppConfig类
             */
            AnnotationConfigWebApplicationContext rootContext = new AnnotationConfigWebApplicationContext();
            rootContext.register(AppConfig.class);
            servletContext.addListener(new ContextLoaderListener(rootContext));

        }

        /*
         * spring-mvc 上下文
         */
        AnnotationConfigWebApplicationContext springMvcContext = new AnnotationConfigWebApplicationContext();
//        springMvcContext.register(MvcConfig.class);

        /*
         * DispatcherServlet
         */
        DispatcherServlet dispatcherServlet = new DispatcherServlet(springMvcContext);
        ServletRegistration.Dynamic dynamic = servletContext.addServlet("dispatcherServlet", dispatcherServlet);
        dynamic.setLoadOnStartup(1);
        dynamic.addMapping("/");

        /*
         * CharacterEncodingFilter: 解决中文乱码问题
         */
        CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
        characterEncodingFilter.setEncoding("utf-8");
        FilterRegistration characterEncodingfilterRegistration =
                servletContext.addFilter("characterEncodingFilter", characterEncodingFilter);
        characterEncodingfilterRegistration.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), false, "/*");
    }

}

MvcConfig 配置如下：

public class MvcConfig extends WebMvcConfigurationSupport {

    private static final Logger logger = LogManager.getLogger(MvcConfig.class);

    /**
     * 注册视图处理器
     * @return
     */
    @Bean
    public ViewResolver viewResolver() {
        logger.info("注册视图处理器-------->ViewResolver");
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setPrefix("/jsp/");
        viewResolver.setSuffix(".jsp");
        return viewResolver;
    }

    /**
     * 资源访问处理器
     * 可以在jsp中使用/images/**的方式访问/images/下的内容
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        logger.info("资源访问处理器-------->addResourceHandlers");
        registry.addResourceHandler("/resources/**")
                .addResourceLocations("/resources/")
                .resourceChain(true).addResolver(
                        new VersionResourceResolver().addContentVersionStrategy("/**"));
    }
}

结果出现No mapping found for HTTP request with URI警告，访问静态资源时为404错误。

经调试发现，在MvcConfig类中加入下面Bean，问题解决

    @Bean
    public HandlerMapping resourceHandlerMapping() {
        logger.info("HandlerMapping");
        return super.resourceHandlerMapping();
    }

为什么要显式声明该Bean，尚未得知。

另外，如果在MvcConfig类中加注解，@Configuration，在WebInitializer类中配置

        AnnotationConfigWebApplicationContext springMvcContext = new AnnotationConfigWebApplicationContext();
        springMvcContext.register(MvcConfig.class);

将会导致MvcConfig加载两次，可以注释掉其中一边。

原文地址：https://www.cnblogs.com/huanghongbo/p/8920318.html