http请求由三部分组成，分别是：请求行、消息报头、请求正文。
POST /api/sample/form/post1 HTTP/ (CRLF) Accept:*/*(CRLF) ... HOST:192.168.0.55:8085 (CRLF) Content-Length:22 (CRLF) Connection:Keep-Alive (CRLF) Cache-Control:no-cache (CRLF) (CRLF) //该CRLF表示消息报头已经结束，在此之前为消息报头 user=jeffrey&pwd=1234 //此行以下为提交的数据curl的表述形式：
curl -X POST "http://192.168.0.55:8085/api/sample/form/post1" -H "Content-Type: application/x-www-form-urlencoded" -d "pwd=123&user=jeffrey"HTTP请求的Content-Type作用于请求正文部分。Content-Type的默认值为application/x-www-form-urlencoded。
HTTP请求的Content-Type取值：
application/x-www-form-urlencodedmultipart/form-dataapplication/json…curl的表述形式：
curl -X POST "http://192.168.0.55:8085/api/common/upload/file" -H "accept: */*" -H "Content-Type: multipart/form-data" -F "file=@2.jpg;type=image/jpeg"https://www.cnblogs.com/coce/p/9720285.html https://www.cnblogs.com/wuyun-blog/p/7724495.html https://blog.csdn.net/zsensei/article/details/80043764 https://blog.csdn.net/Andrewniu/article/details/81533905 https://blog.csdn.net/Andy2019/article/details/100112550
https://blog.csdn.net/u012235103/article/details/89552453 https://blog.csdn.net/weixin_34191845/article/details/88012221
https://www.cnblogs.com/tu-0718/p/8370925.html https://www.cnblogs.com/yangguoe/p/8986108.html https://www.cnblogs.com/mahuan2/p/6008832.html https://stackoverflow.com/questions/12893566/passing-multiple-variables-in-requestbody-to-a-spring-mvc-controller-using-ajax https://github.com/chujianyun/Spring-MultiRequestBody https://blog.csdn.net/w605283073/article/details/82119284 https://stackoverflow.com/questions/37922973/spring-mvc-file-upload-unable-to-process-parts-as-no-multi-part-configuration https://blog.csdn.net/qq_34608620/article/details/80635139 https://blog.csdn.net/qq_36798969/article/details/104692248
