未找到多部分边界答案

【问题标题】：no multipart boundary was found未找到多部分边界
【发布时间】：2019-03-01 08:13:16
【问题描述】：

使用 Rest Client Chrome 工具，我在我的请求中上传了一个 JSON 文件，例如 sample.json。低于异常。尝试将标头作为 multipart/form-data 传递，也没有传递后者。但结果是一样的。我做得对吗？

the request 
was rejected because no multipart boundary was found

public HttpEntity<?> uploadJsonFile(@PathVariable("jsonFileID") String
    jsonFileID, @RequestParam("file") MultipartFile file) throws Exception 
    {
        // Some code here
    }

Failed to parse multipart 
servlet request; nested exception is java.io.IOException: 
org.apache.tomcat.util.http.fileupload.FileUploadException: the request 
was rejected because no multipart boundary was found] with root cause

org.apache.tomcat.util.http.fileupload.FileUploadException: the request 
was rejected because no multipart boundary was found
at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:831) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.connector.Request.parseParts(Request.java:2884) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
at org.apache.catalina.connector.Request.parseParameters(Request.java:3232) ~[tomcat-embed-core-8.5.32.jar:8.5.32]

【问题讨论】：

标签： spring spring-boot httprequest

【解决方案1】：

为了你的眼睛，在java中你可能会使用：

String boundary = Long.toHexString(System.currentTimeMillis());
            request.getHeaders().setContentType("multipart/form-data; boundary="+boundary);

【讨论】：

【解决方案2】：

您似乎没有在 HTTP 请求标头中指定边界 - 请参阅此处了解我的意思 Unable to send a multipart/mixed request to spring MVC based REST service

Content-Type: multipart/mixed;boundary=YourBoundaryOfChoiceHere

【讨论】：

边界是什么意思？
Content-Type: multipart 基本上就是这样 - 一条消息被分成多个部分并按原样发送。边界是这些部分之间的分隔符。如果您的边界是“abc”，则分隔符将是 HTTP 标准中定义的“--abc--”

【解决方案3】：

从标题中删除 'Content-Type': 'multipart/form-data'

为我工作

【讨论】：