如何将文件与包含有关文件的附加信息的对象的 json 一起上传？答案

【问题标题】：How to upload a file together with a json of an object containing additional information about the file?如何将文件与包含有关文件的附加信息的对象的 json 一起上传？
【发布时间】：2023-03-11 17:25:01
【问题描述】：

请问如何上传 CSV 文件（产品目录）以及包含目录名称和日期的 JSON 对象？我将 Spring Boot (1.3.3.RELEASE) 与 jackson-databind 用于 JSON REST API 和 SwaggerUI (2.1.4 - 直接包含在项目中，而不是作为 Maven 依赖项)。我创建了以下端点：

@RequestMapping(method = POST, consumes = MULTIPART_FORM_DATA_VALUE)
@ApiOperation(value = "Create catalogue by uploading a file", consumes = MULTIPART_FORM_DATA_VALUE)
public Catalogue createCatalogue(@RequestPart("catalogue") Catalogue catalogue, MultipartFile file) {...}

DTO 目录如下所示：

@Data
public class Catalogue {
    private String name;
    private LocalDate validFrom;
    private LocalDate validTo;
}

我使用 SwaggerUI 将文件和 json (textarea) 发布到此端点：

{"name":"Katalog 2016"}

但是当 Spring 尝试反序列化 Catalog 时出现错误，因为 contentType 为空：

org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/octet-stream' not supported

这是日志过滤器记录的完整请求：

REQUEST: {"method":"POST","path":"/api/v1/catalogues","params":{"catalogue":"{\"name\":\"Katalog 2016\"}"},"headers":{"content-length":"318","referer":"http://localhost:8000/swagger/index.html","accept-language":"cs","cookie":"oracle.uix=0^^GMT+1:00^p; wp-settings-time-1=1458506367; pll_language=en; 9d4bb4a09f511681369671a08beff228=9kp8k4p5rtbsvb0dtg0c585l50; 462bddfc0804b9e2d3bedb862fe829b3=jg9rhnasq47dnluai04pp9dpg0; 6b983e6bbfb12fe47cd501a09aa63a2f=t4bg8eeakngjag7pkd3qldjki1; wp-settings-2=editor%3Dhtml%26libraryContent%3Dbrowse; wp-settings-time-2=1459108118; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_86a9106ae65537651a8e456835b316ab=admin%7C1459353525%7ChXEWYSjH45ohapLSXw6NZOyIdQ0qrDGpSDieVRbNCh1%7Cd39d1b99843b348cca8c992a3908ae6aef303e9e7196d38fa6173fd91146b260; JSESSIONID=93D946F7EC2F8E8FFC880A1D5752BBEA","origin":"http://localhost:8000","host":"localhost:8000","x-requested-with":"XMLHttpRequest","connection":"keep-alive","content-type":"multipart/form-data; boundary=----WebKitFormBoundaryMnZeiNwIgldJlGGd","accept-encoding":"gzip, deflate","accept":"application/json;charset=UTF-8","user-agent":"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36"},"body":[EMPTY]}

请问我错过了什么？提前谢谢了。沃杰科技

更新： 我介绍了 CommonsMultipartResolver：

@Bean
public CommonsMultipartResolver multipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setMaxUploadSize(5242880L);
    resolver.setDefaultEncoding("UTF-8");
    return resolver;
}

我现在又遇到一个错误：

org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part 'catalogue' is not present

【问题讨论】：

标签： rest spring-mvc spring-boot jackson

【解决方案1】：

您在目录部分的端点中有错误。注释@RequestPart 用于文件而不是对象。可能你需要这个端点定义：

public Catalogue createCatalogue(@RequestParam("catalogue") String catalogue, @RequestPart("file") MultipartFile file) {
}

【讨论】：