How to write the file from MultipartHttpServletRequest in java

As my backend end team will send the zip file , how to receive the file and store into the project location in java(eclipse)

As im tried some code using MultipartHttpServletRequest and getting multipart length and zip folder also created but when unable to extract that showing invalid. then how to write into the file . Please help me

@RequestMapping(value = "/retrieveBillerByFile1", method = RequestMethod.POST)
public @ResponseBody void retrieveBillerByFile1(@RequestPart MultipartHttpServletRequest  request) throws Exception 
{
System.out.println("RESPONSEEEE**"+request);
Iterator<String> itrator = request.getFileNames();
System.out.println("File Name:" + request.getFileNames());
MultipartFile multiFile = request.getFile(itrator.next());
System.out.println("itrator.next()" + itrator.next());
try {
// just to show that we have actually received the file
System.out.println("File Length:" + multiFile.getBytes().length);
String name = multiFile.getOriginalFilename();
System.out.println("name" + name);
System.out.println("multiFile.getBytes()" + multiFile.getBytes());
BufferedWriter w = Files.newBufferedWriter(Paths.get("D:\\cedge_uat\\" + name ));
w.write(new String(multiFile.getBytes()));
w.flush();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new Exception("Error while loading the file");
}
}

Another Way I have tried but fileItem getting as null

@RequestMapping(value = "/retrieveBillerByFile", method = RequestMethod.POST)
public @ResponseBody void retrieveBillerByFile(@RequestPart HttpServletRequest request,
HttpServletResponse response) throws Exception 
{
System.out.println("RESPONSEEEE**"+request);
System.out.println("request**"+request);
// checks if the request actually contains upload file
if (!ServletFileUpload.isMultipartContent(request)) {
System.out.println("Form must has enctype=multipart/form-data.**");
// if not, we stop here
PrintWriter writer = response.getWriter();
writer.println("Error: Form must has enctype=multipart/form-data.");
writer.flush();
return;
}
// configures upload settings
DiskFileItemFactory factory = new DiskFileItemFactory();
// sets memory threshold - beyond which files are stored in disk
factory.setSizeThreshold(MEMORY_THRESHOLD);
// sets temporary location to store files
factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
ServletFileUpload upload = new ServletFileUpload(factory);
// sets maximum size of upload file
upload.setFileSizeMax(MAX_FILE_SIZE);
// sets maximum size of request (include file + form data)
upload.setSizeMax(MAX_REQUEST_SIZE);
// constructs the directory path to store upload file
// this path is relative to application's directory
//  String uploadPath = servletContext.getRealPath("")+ File.separator + UPLOAD_DIRECTORY;
String uploadPath = servletContext.getRealPath("/WEB-INF/xml") + File.separator + UPLOAD_DIRECTORY;
// creates the directory if it does not exist
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}
System.out.println("uploadPath\n"+ uploadPath);
try {
// parses the request's content to extract file data
@SuppressWarnings("unchecked")
List<FileItem> formItems = upload.parseRequest(request);
System.out.println("formItems**"+formItems);
if (formItems != null && formItems.size() > 0) {
// iterates over form's fields
for (FileItem item : formItems) {
System.out.println("item**"+item);
// processes only fields that are not form fields
if (!item.isFormField()) {
String fileName = new File(item.getName()).getName();
System.out.println("fileName**"+fileName);
String filePath = uploadPath + File.separator + fileName;
File storeFile = new File(filePath);
// saves the file on disk
item.write(storeFile);
System.out.println("success");
request.setAttribute("message",
"Upload has been done successfully!");
}
}
}
} catch (Exception ex) {
System.out.println("exception"+ ex.getMessage());
request.setAttribute("message",
"There was an error: " + ex.getMessage());
}
}

You can add another param in the method --

@RequestParam MultipartFile file

so your method will be --

public @ResponseBody void retrieveBillerByFile1(@RequestParam MultipartFile file, @RequestPart MultipartHttpServletRequest  request) throws Exception 

And then manipulate the file using java file apis