java - 难以通过 REST 上传文件

Question

这个问题已经有答案了:

The request was rejected because no multipart boundary was found in springboot (10 个回答)

已关闭 4 年前。

如果在 SpringBoot 应用程序中通过 REST 上传文件时遇到一些困难。为了测试 REST 接口(interface)，我使用 Insomnia 或有时使用 Curl。在 Insomnia 中，我已配置为使用调用作为 POST。此外，我附加了一个简单的 .txt 文件，其中包含名称和一些仅“测试”的内容。我使用 Content-Type = multipart/form-data 作为 header 。

当我触发 REST 调用时，我在 REST 客户端内收到以下错误消息:

{
  "timestamp": "2019-04-04T08:51:19.743+0000",
  "status": 500,
  "error": "Internal Server Error",
  "message": "Failed to parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found",
  "path": "/upload/upload_file"
}

我的 RestController 看起来像这样:

@RestController
@RequestMapping("/upload")
public class FileUploadController {

    ...

    @PostMapping("/upload_file")
    public String upload(@RequestParam("file") MultipartFile file) {
        return "test";
    }

发送 REST 调用后，服务器显示以下错误消息:

org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found
at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:990) ~[commons-fileupload-1.3.jar:1.3]
at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310) ~[commons-fileupload-1.3.jar:1.3]
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334) ~[commons-fileupload-1.3.jar:1.3]
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115) ~[commons-fileupload-1.3.jar:1.3]
at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.multipart.commons.CommonsMultipartResolver.resolveMultipart(CommonsMultipartResolver.java:142) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1175) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1010) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) ~[spring-webmvc-5.1.5.RELEASE.jar:5.1.5.RELEASE]

Answer 1

您收到此异常是因为您尚未在应用程序中指定多形式数据的限制。因此，您必须指定该限制。

只需在“application.properties”文件或“application.yml”文件中添加以下行即可。

spring.http.multipart.max-file-size=20MB

享受编码的乐趣..