经过反复测试排查，才确认，servlet无法使用request.getParameter()读取使用multipart/form-data发送的数据。
request.getParameter()只能读取使用application/x-www-form-urlencoded发送的数据。
两者报文格式分别如下：
1、application/x-www-form-urlencoded：
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
POST /xxxyyy HTTP/1.1
Host: 192.168.1.1:8080
Connection: keep-alive
Content-Length: 75
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
username=zhangsan&location=9&sax=male
(此处无换行)
2、multipart/form-data：
~~~~~~~~~~~~~~~~~~~~~
POST /xxyyzz HTTP/1.1
Host: 192.168.1.1:8080
Connection: keep-alive
Content-Length: 43164
Cache-Control: max-age=0
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryEd5vCC6bFMXXvNC7
------WebKitFormBoundaryEd5vCC6bFMXXvNC7
Content-Disposition: form-data; name="usernam"
zhangsan
------WebKitFormBoundaryEd5vCC6bFMXXvNC7
Content-Disposition: form-data; name="location"
9
------WebKitFormBoundaryEd5vCC6bFMXXvNC7
Content-Disposition: form-data; name="sex"
male
------WebKitFormBoundaryEd5vCC6bFMXXvNC7
Content-Disposition: form-data; name="filen"; filename="testf.jpg"
Content-Type: image/jpeg
此处文件二进制数据
------WebKitFormBoundaryEd5vCC6bFMXXvNC7--
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