10.3、创建WebConfig配置类，代替SpringMVC的配置文件

@Configuration
//扫描组件
@ComponentScan("com.atguigu.mvc.controller") 
//开启MVC注解驱动 
@EnableWebMvc 
public class WebConfig implements WebMvcConfigurer { 
    //使用默认的servlet处理静态资源 
    @Override 
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable(); 
    }
    //配置文件上传解析器 
    @Bean 
    public CommonsMultipartResolver multipartResolver(){
        return new CommonsMultipartResolver();
    }
    //配置拦截器 
    @Override 
    public void addInterceptors(InterceptorRegistry registry) {
        FirstInterceptor firstInterceptor = new FirstInterceptor(); 
        registry.addInterceptor(firstInterceptor).addPathPatterns("/**"); 
    }
    //配置视图控制
    /*@Override 
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
    }*/
    //配置异常映射 
    /*@Override 
    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
            SimpleMappingExceptionResolver exceptionResolver = new SimpleMappingExceptionResolver(); 
         Properties prop = new Properties();
         prop.setProperty("java.lang.ArithmeticException", "error"); 
         //设置异常映射 
         exceptionResolver.setExceptionMappings(prop); 
         //设置共享异常信息的键 
         exceptionResolver.setExceptionAttribute("ex");
         resolvers.add(exceptionResolver); 
     }*/
    //配置生成模板解析器
    @Bean 
    public ITemplateResolver templateResolver() { 
        WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext(); 
        // ServletContextTemplateResolver需要一个ServletContext作为构造参数，可通过 WebApplicationContext 的方法获得
        ServletContextTemplateResolver templateResolver = 
            new ServletContextTemplateResolver( webApplicationContext.getServletContext()); 
        templateResolver.setPrefix("/WEB-INF/templates/");
        templateResolver.setSuffix(".html");
        templateResolver.setCharacterEncoding("UTF-8");
        templateResolver.setTemplateMode(TemplateMode.HTML); 
        return templateResolver; 
    }
    //生成模板引擎并为模板引擎注入模板解析器
    @Bean 
    public SpringTemplateEngine templateEngine(ITemplateResolver templateResolver) {
        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.setTemplateResolver(templateResolver);
        return templateEngine;
    }
    //生成视图解析器并未解析器注入模板引擎
    @Bean 
    public ViewResolver viewResolver(SpringTemplateEngine templateEngine) { 
        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver(); 
        viewResolver.setCharacterEncoding("UTF-8"); 
        viewResolver.setTemplateEngine(templateEngine); 
        return viewResolver;
    }
}