@Configuration
@EnableWebMvc
@ComponentScan("com.mcs.Sgin.web") // 启用自动扫描
public class WebConfig extends WebMvcConfigurerAdapter {

    // 配置Thymeleaf视图解析器
    @Bean
    public ViewResolver viewResolver() {
        ThymeleafViewResolver resolver = new ThymeleafViewResolver();
        resolver.setTemplateEngine(templateEngine()); // 在这里templateEngine()并不是直接调用这个类里的方法，它是Spring管理的bean。Spring会拦截所有对templateEngine()的调用
        resolver.setCharacterEncoding("UTF-8");
        return resolver;
    }

    @Bean
    public SpringTemplateEngine templateEngine() {
        // SpringTemplateEngine自动接受SpringStandardDialect and
        // 开启Spring信息源。
        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.setTemplateResolver(templateResolver());
        // Enabling the SpringEL compiler with Spring 4.2.4 or newer can
        // speed up execution in most scenarios, but might be incompatible
        // with specific cases when expressions in one template are reused
        // across different data types, so this flag is "false" by default
        // for safer backwards compatibility.
        templateEngine.setEnableSpringELCompiler(true);
        return templateEngine;
    }

    @Bean
    public SpringResourceTemplateResolver templateResolver() {
        // SpringResourceTemplateResolver automatically integrates with Spring‘s own
        // resource resolution infrastructure, which is highly recommended.
        SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
        templateResolver.setPrefix("/WEB-INF/views/");
        templateResolver.setSuffix(".html");
        // HTML is the default value, added here for the sake of clarity.
        templateResolver.setTemplateMode(TemplateMode.HTML);
        // Template cache is true by default. Set to false if you want
        // templates to be automatically updated when modified.
        templateResolver.setCacheable(true);
        return templateResolver;
    }

    // 配置静态资源的处理
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        // TODO Auto-generated method stub
        configurer.enable();
    }
}