1、設定絕對路徑

application.properties的配置

#靜態資源對外暴露的訪問路徑
file.staticAccessPath=/upload/**
#檔案上傳目錄（注意Linux和Windows上的目錄結構不同）
#file.uploadFolder=/home/upload/
file.uploadFolder=d://upload/

配置上傳檔案的目錄，也可以在這裡設定上傳檔案的大小

@Configuration
public class UploadFileConfig {

    @Value(
 
"${file.uploadFolder}")
    private String uploadFolder;

    @Bean
    MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setLocation(uploadFolder);
        //檔案最大
        factory.setMaxFileSize("5MB");
        
 
// 設定總上傳資料總大小
        factory.setMaxRequestSize("10MB");
        return factory.createMultipartConfig();
    }
}

2、設定虛擬路徑，訪問絕對路徑下資源

@Configuration
public class UploadFilePathConfig extends WebMvcConfigurerAdapter {

    @Value("${file.staticAccessPath}")
    private String staticAccessPath;
    @Value(
 
"${file.uploadFolder}")
    private String uploadFolder;

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler(staticAccessPath).addResourceLocations("file:" + uploadFolder);
    }
}

這時就可以通過訪問 http://localhost:8080/upload/xxx.jpg訪問d://upload/下的資源。