MissingServletRequestPartException：Required request part ‘file‘ is not present上传文件报错

前端使用的upload：

<el-uploadaction="":http-request="uploadPost":show-file-list="false":on-change="onChange"list-type="picture"><img :src="dialogImageUrl" >
</el-upload>

onChange(file,fileList){this.dialogImageUrl = file.url;this.file = file;console.log(file);},uploadPost(){let formData = new FormData();formData.append('file',this.file.raw);// 文件上传必须设置http请求头信息request.post("/api/main/uploadPicture",formData,{headers:{'Content-Type':'multipart/form-data;charset=utf-8'}}).then(res => {if(res.code == '0'){this.$message.success("上传成功！");}else{this.$message.error(res.code+' 上传失败！'+res.msg);}},error => {console.log('253: 错误! '+error);})},

这里最重要的是formData.append('file',this.file.raw);取得是this.file.raw

然后记得设置http请求头{
headers:{'Content-Type':'multipart/form-data;charset=utf-8'}
}

后端：

@PostMapping("/uploadPicture")public Result<?> uploadPicture(@RequestBody MultipartFile file){try{if(!file.isEmpty()){System.out.println("上传头像");String imgPath = "C:/Users/Administrator/Desktop/img";File f = new File(imgPath+new Date().getTime()+file.getOriginalFilename());byte[] arr = file.getBytes();file.transferTo(f);return Result.success();}else{return Result.error("139","图片为空");}}catch (Exception e){e.printStackTrace();return Result.error("139",e.getMessage());}}

这里使用@RequestBody MultipartFile file，也可以使用@RequestParam("file") MultipartFile file，只要对应前端的参数名就行，formData.append('file',this.file.raw)

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MissingServletRequestPartException：Required request part ‘file‘ is not present上传文件报错

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