解决springboot 2.x 里面访问静态资源的坑

@ConditionalOnMissingBean(WebMvcConfigurationSupport.class) 

/**
 * 原来是这么写的：
 * public class BeanConfiguration extends WebMvcConfigurationSupport
 * 导致默认配置的静态资源不生效了
 */
@Configuration
public class BeanConfiguration implements WebMvcConfigurer {
    @Bean
    public MappingJackson2HttpMessageConverter jackson2HttpMessageConverter() {
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        mapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
        mapper.setDefaultPropertyInclusion(JsonInclude.Include.ALWAYS);
        converter.setObjectMapper(mapper);
        return converter;
    }
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        //将我们定义的时间格式转换器添加到转换器列表中,
        //这样jackson格式化时候但凡遇到Date类型就会转换成我们定义的格式
        converters.add(jackson2HttpMessageConverter());
        // 添加字符串转换，否认如果返回字符串，则会报异常，其他converter 
        // 参考：org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport#addDefaultHttpMessageConverters
        StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter();
        stringHttpMessageConverter.setWriteAcceptCharset(false);  // see SPR-7316
        converters.add(stringHttpMessageConverter);
    }
}

package com.example.thymeleaf.commons; 
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
/**
 * 配置静态资源映射
 *
 * @author sunziwen
 * @version 1.0
 * @date 2018-11-16 14:57
 **/
@Component
public class WebMvcConfig implements WebMvcConfigurer {
    /**
     * 添加静态资源文件，外部可以直接访问地址
     *
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
    }
}