参考该文解决问题：http://blog.csdn.net/sanjay_f/article/details/47407063
报错
threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found] with root cause
org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found
不手动添加content-type后就行了：此时访问成功。
问题的原因
You shouldNEVERset that header yourself. We set the header properly with the boundary. If you set that header, we won't and your server won't know what boundary to expect (since it is added to the header). Remove your custom Content-Type header and you'll be fine.
src：
http://stackoverflow.com/questions/17415084/multipart-data-post-using-Python-requests-no-multipart-boundary-was-found
简称。。制作多情。。。头部会自动加好，不要画足添蛇。。。。。。。。。