title: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is application/x-www-form-urlencoded
body: <p>I'm trying to get user's file that they upload,but when you choose a file and submit,that error will come.</p>
  
  <p><strong>THE ERROR:</strong></p>
  
  <pre><code>org.apache.commons.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is application/x-www-form-urlencoded
          at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.&lt;init&gt;(FileUploadBase.java:947)
          at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310)
          at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334)
          at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
          at com.example.HttpRequest.doPost(HttpRequest.java:153)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:498)
          at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
          at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
          at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)
          at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
          at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
          at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
          at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
          at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
          at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
          at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
          at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
          at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
          at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
          at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
          at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
          at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)
          at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
          at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
          at java.lang.Thread.run(Thread.java:745)
      org.apache.commons.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is application/x-www-form-urlencoded
          at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.&lt;init&gt;(FileUploadBase.java:947)
          at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310)
          at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334)
          at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
          at com.example.HttpRequest.doPost(HttpRequest.java:153)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:498)
          at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
          at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
          at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)
          at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
          at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
          at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
          at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
          at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
          at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
          at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
          at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
          at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
          at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
          at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
          at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)
          at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)
          at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
          at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
          at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  
  <p><strong>HTTP:</strong></p>
  
  <pre><code>writer.write("&lt;td&gt;&lt;input type='file' id='file_input' enctype='multipart/form-data' multiple=webkitdirectory=''&gt;&lt;/td&gt;");
  </code></pre>
  
  <p><strong>dopost.java</strong>(the main part of it)</p>
  
  <pre><code>// Create a factory for disk-based file items  
              DiskFileItemFactory factory = new DiskFileItemFactory();
              // Set factory constraints
              factory.setSizeThreshold(4096); 
              factory.setRepository(tempPathFile);
           // Create a new file upload handler
              ServletFileUpload upload = new ServletFileUpload(factory);
  
              // Set overall request size constraint
              upload.setSizeMax(4194304); 
  
              List&lt;FileItem&gt; items = upload.parseRequest(request);
              Iterator&lt;FileItem&gt; i = items.iterator();
              while (i.hasNext()) {
                 FileItem fi = (FileItem) i.next();
                 String fileName = fi.getName();
                 if (fileName != null) {
                     File fullFile = new File(fi.getName());
                     File savedFile = new File(uploadPath, fullFile.getName());
                     fi.write(savedFile);
                 }
              }
              System.out.print("upload succeed");
  </code></pre>