上传文件示例代码：
@ApiOperation("上传文件")
@PostMapping(value = "/uploadFile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public ApiResult<String> uploadFile(@RequestPart("file") MultipartFile file) {
//调用七牛云上传后返回图片地址
if (file == null || file.isEmpty()) {
  return ApiResult.error("上传文件不能为空");
}
log.info("file size:{}",file.getSize());
String fileUrl = uploadService.uploadFile(file);
   return ApiResult.success(fileUrl);
}

**

MultipartProperties

**

单次请求异常：(>10M)
org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.impl.SizeLimitExceededException: the request was rejected because its size (13490731) exceeds the configured maximum (10485760)
    at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.handleParseFailure(StandardMultipartHttpServletRequest.java:122)

单个文件异常:（>1M）
org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.impl.FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes.
    at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.handleParseFailure(StandardMultipartHttpServletRequest.java:122)

修改文件大小限制：
方式一: yml文件中进行配置
spring:
  servlet:
    multipart:
      # -1 无限制
      max-file-size: 10MB
      # -1 无限制
      max-request-size: 20MB

方式二: bean进行配置
    @Bean
    public MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setMaxFileSize(DataSize.of(10, DataUnit.MEGABYTES));
        factory.setMaxRequestSize(DataSize.of(20, DataUnit.MEGABYTES));
        return factory.createMultipartConfig();
    }