Загрузка файла с помощью ajax в Struts 1.2

Question

Кто-нибудь знает, как загрузить файл, используя ajax в Struts 1.2.без jquery

Вот мой код,

Javascript

function addPhoto(){
var uploadUrl = 'doAjaxWork.do?reqCode=uploadPhoto';
var file = document.getElementById("imageFile").files[0];
var xhr = new XMLHttpRequest(); 
xhr.onload = function (e) {

};xhr.onerror = function (e) {

};
xhr.open("GET", uploadUrl, true);

xhr.setRequestHeader("Content-Type", "multipart/form-data");
xhr.setRequestHeader("X-File-Name", file.name);
xhr.setRequestHeader("X-File-Size", file.size);
xhr.setRequestHeader("X-File-Type", file.type);
xhr.send(file);
alert('end');
return true;

}

Функция скрипта Java работает нормально.То, что я не могу понять, это как получить файл из Java-бэкэнда.Я не смог найти ни одного примера из интернета.

Java

  DiskFileItemFactory factory = new DiskFileItemFactory();
  ServletFileUpload upload = new ServletFileUpload(factory);
  List<FileItem> items = upload.parseRequest(request);
  Iterator<FileItem> iter = items.iterator();

Полная трассировка стека выглядит следующим образом

org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found
    at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.(FileUploadBase.java:814)
    at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:323)
    at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:341)
    at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
    at com.recruitment.joiningform.CandidateJoiningformDispatchAction.uploadPhoto(CandidateJoiningformDispatchAction.java:1404)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270)
    at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
    at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
    at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)