Renaming file name on upload, JSP

Question

I have 4 input tags to upload 4 different files,

<form method="post" name="myform" action="upload" target="_blank" enctype="multipart/form-data" style="position: absolute; right: -5%; top: 2%;">
Left File :  <input type="file" name="dataFile1" id="fileChooser1" /><br><br>
Right File : <input type="file" name="dataFile2" id="fileChooser2" /><br><br>
Config File :<input type="file" name="dataFile3" id="fileChooser3" /><br><br>
Geco File :  <input type="file" name="dataFile4" id="fileChooser4" /><br><br><br>
<button type="button" onclick="ValidateFile()">Click to Upload</button>
</form>

Now on my Servlet.java side I want to rename the file which is being uploaded.

How do I do that? Using commons up loader.

PS: I've tried to get the name of the id of the input tag so that I can create an if loop and assign fileName name as required,

String my = request.getParameter("dataFile1");
System.out.println(my);

This print's null.

Answer 1

To figure out which file is which, use the FileItem that you get from ServletFileUpload#parseRequest , you can call the getFieldName method to get the value of the name attribute from the JSP snippet above.

To save the file with a particular name, create a File object with the correct name and call FileItem#write with that object.

This code is untested but should give you a place to start.

List items = upload.parseRequest(httpRequest);
Iterator iter = items.iterator();
File outputDir = getOutputDir();
while (iter.hasNext()) {
  FileItem item = (FileItem) iter.next();
  String origName = item.getFieldName();
  if ("dataFile1".equals(origName) {
    File outputFile = new File(outputDir, "firstFile.txt"); // This bit is doing the renaming
    item.write(outputFile);
  } // ... else all the other inputs get handled ...
}

Answer 2

i think what you have to do is the following :

1st - parse the request to get a list of FileItem like the following :

List<FileItem> items = upload.parseRequest(request);

2nd - process the uploaded items like the following :

Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) {  
  FileItem item = iter.next();   
 if (item.isFormField()) {      
  processFormField(item);   
 } else if (!item.isFormField()) { 
 // Process a file upload
    String fieldName = item.getFieldName();  
  String fileName = item.getName();   
 String contentType = item.getContentType(); 
   boolean isInMemory = item.isInMemory();  
  long sizeInBytes = item.getSize();

//here you change the name of the uploaded file and then write it 

    File uploadedFile = new File(dir , "fileName");   
 item.write(uploadedFile);


  }
}

and please check the documentation here in the section Processing the uploaded items .

and give me some feedback

Hope That Helps .