在本地上傳文件是正常的，但訪問外網鏈接，上傳文件報錯:
Caused by: org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. null
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:351)
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158)
... 38 more
Caused by: java.net.SocketTimeoutException
at org.apache.tomcat.util.net.NioBlockingSelector.read(NioBlockingSelector.java:201)
at org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:235)
at org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:216)
at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1280)
at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.read(NioEndpoint.java:1223)
at org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:729)
at org.apache.coyote.http11.Http11InputBuffer.access$300(Http11InputBuffer.java:40)
at org.apache.coyote.http11.Http11InputBuffer$SocketInputBuffer.doRead(Http11InputBuffer.java:1084)
at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:140)
at org.apache.coyote.http11.Http11InputBuffer.doRead(Http11InputBuffer.java:263)
at org.apache.coyote.Request.doRead(Request.java:581)
at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:326)
at org.apache.catalina.connector.InputBuffer.checkByteBufferEof(InputBuffer.java:642)
at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:349)
at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:183)
at java.io.FilterInputStream.read(FilterInputStream.java:133)
at org.apache.commons.fileupload.util.LimitedInputStream.read(LimitedInputStream.java:134)
at org.apache.commons.fileupload.MultipartStream$ItemInputStream.makeAvailable(MultipartStream.java:999)
at org.apache.commons.fileupload.MultipartStream$ItemInputStream.read(MultipartStream.java:903)
at java.io.InputStream.read(InputStream.java:101)
at org.apache.commons.fileupload.util.Streams.copy(Streams.java:100)
at org.apache.commons.fileupload.util.Streams.copy(Streams.java:70)
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:347)
... 40 more
解決：修改tomcat的server.xml,
<Connector executor="tomcatThreadPool"
port="8801" protocol="HTTP/1.1"
maxHttpHeaderSize="8192"
enableLookups="false"
redirectPort="9443"
acceptCount="2000"
connectionTimeout="300" server="noinfo" disableUploadTimeout="false"/>
添加 disableUploadTimeout="false"