봄에 파일을 업로드하고 아약스를 사용하여 응답을 캡처하는 중 오류가 발생했습니다.

Question

봄 멀티 파트 파일을 사용하여 파일을 업로드하고 있지만 AJAX를 사용하여 응답을 캡처하려고 할 때 널 포인터 예외가 발생합니다. AJAX를 통해 응답을 캡처하지 않고 파일을 성공적으로 업로드 할 수 있습니다. 즉, 양식의 id 속성을 제거하거나 스크립트가 일부 오류로 인해 실행되지 않습니다.

JSP 양식

<form action="actionXMLUpload" method="POST" 
    enctype="multipart/form-data" id="dealform"> 
    Select XML file to upload <input type="file" name="file" 
     accept="text/xml" /> <input type="submit" value="Upload XML" /> 
</form> 

AJAX 코드 -

$('#dealform').submit(function() { // catch the form's submit event 
    $.ajax({ // create an AJAX call... 
     data : $(this).serialize(), // get the form data 
     type : $(this).attr('method'), // GET or POST 
     url : $(this).attr('action'), // the file to call 
     success : function(response) { // on success.. 
      $('#pages').html(response); // update the DIV  
     } 
    }); 
    return false; // cancel original event to prevent form submitting 
}); 

봄 컨트롤러 -

@RequestMapping(value = "/actionXMLUpload", method = RequestMethod.POST) 
public String uploadXML(FileUploadUtil xmlUtil, BindingResult result, Model model) { 
    if (result.hasErrors()) { 
     return "xmlupload"; 
    } 
    try {   
     File destFile = new File("D:\\Travel_Portal\\" 
       + xmlUtil.getFile().getOriginalFilename());   
     xmlUtil.getFile().transferTo(destFile);   
     dealXMLParser.xmlParser(); 
     logger.info("********XML FILE SUCCESSFULLY UPLOADED*********"); 
     model.addAttribute(MESSAGE, "XML File Successfully Uploaded!!!"); 
     return "xmlupload"; 
    } catch (Exception e) { 
     logger.error("********XML FILE NOT SUCCESSFULLY UPLOADED*********", 
       e); 
     model.addAttribute(MESSAGE, "Error Uploading XML File!!! Please Try Again!!!"); 
     return "xmlupload"; 
    } 
} 

예외 파일에서 DestFile이 = 새로운 파일 ("D : \ Travel_Portal \" 을 + xmlUtil.getFile(). getOriginalFilename());

java.lang.NullPointerException 
at com.travelportal.controller.UploadController.uploadXML(UploadController.java:84) 
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:601) 
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212) 
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) 
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) 
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) 
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) 
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399) 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317) 
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204) 
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311) 
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:722) 

Answer 1

@RequestBody을 사용하면 나를 위해 문제가 해결되었습니다. 파일 업로드에 시간이 걸리고 업로드 된 파일 콘텐츠가 필요했기 때문에 이런 일이 발생했습니다.