关于enctype问题, multipart/form-data

Question

the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is null,添加完信息之后到列表页，等一会就报这个错，求大神解答！enctype="multipart/form-data"这句已经在form里加上了

Answer 1

现在的问题是，我debug之后，第一次都得到值了，而且也增加成功了，但是他还会再加载增加一次，这时候就全没有值了，重点是为什么要再加戴增加一次呢
org.apache.commons.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is null
at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.(FileUploadBase.java:908)
at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:331)
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:351)
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
at com.icss.base.util.UploadFile.getParameter(UploadFile.java:227)
at com.icss.biz.calculateTaskManagement.controller.CalculateTaskManagementController.getMapOfRequest(CalculateTaskManagementController.java:304)
at com.icss.biz.calculateTaskManagement.controller.CalculateTaskManagementController.save(CalculateTaskManagementController.java:239)
at com.icss.biz.calculateTaskManagement.controller.CalculateTaskManagementController.performTask(CalculateTaskManagementController.java:88)
at com.icss.base.web.BaseController.doPerformTask(BaseController.java:103)
at com.icss.base.web.BaseController.doGet(BaseController.java:73)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.icss.base.web.EncodingFilter.doFilter(EncodingFilter.java:145)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.icss.base.web.SingleSignOnClient.doFilter(SingleSignOnClient.java:376)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.icss.tds.common.filter.ContextPathRequestFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.icss.tds.common.filter.EncodingFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:620)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
然后就报地堆这个异常