how to upload a file in server using multipart/form-data?

Question

I have written a program in jsp to upload a file in a folder called images created inside webcontent, but my file is not getting uploaded. Please need some help.

<form action="upload_images_result.jsp" method="post">
    <div align="left">
        Select a file: <input type="file" name="file" size="50"
            enctype="multipart/form-data" placeholder="Upload Your Image" />
    </div>
    <br>
    <div>
        <input type="submit" value="Upload File" />
    </div>
</form>

upload_images_result.jsp

<%
File file;
int maxFileSize = 5000 * 1024;
int maxMemSize = 5000 * 1024;
//ServletContext context = pageContext.getServletContext();
String filePath = "D:\\Students_Server\\WebContent\\Images";
// Verify the content type
String contentType = request.getContentType();
if ((contentType.indexOf("multipart/form-data") >= 0)) {

    DiskFileItemFactory factory = new DiskFileItemFactory();
    // maximum size that will be stored in memory
    factory.setSizeThreshold(maxMemSize);
    // Location to save data that is larger than maxMemSize.
    factory.setRepository(new File(               
    filePath "));
    // Create a new file upload handler
    ServletFileUpload upload = new ServletFileUpload(factory);
    // maximum file size to be uploaded.
    upload.setSizeMax(maxFileSize);
    try {
        // Parse the request to get file items.
        List fileItems = upload.parseRequest(request);
        // Process the uploaded file items
        Iterator i = fileItems.iterator();

        out.println("<html>");
        out.println("<head>");
        out.println("<title>JSP File upload</title>");
        out.println("</head>");
        out.println("<body>");
        while (i.hasNext()) {
            FileItem fi = (FileItem) i.next();
            if (!fi.isFormField()) {
                // Get the uploaded file parameters
                String fieldName = fi.getFieldName();
                String fileName = fi.getName();
                boolean isInMemory = fi.isInMemory();
                long sizeInBytes = fi.getSize();
                // Write the file
                if (fileName.lastIndexOf("\\") >= 0) {
                    file = new File(filePath +
               fileName.substring(fileName.lastIndexOf("\\")));
                } else {
                    file = new File(filePath + 
              fileName.substring(fileName.lastIndexOf("\\") + 1));
                }
                fi.write(file);
                out.println("Uploaded Filename: " + filePath + fileName + "
                <br>");
            }
        }
        out.println("</body>");
        out.println("</html>");
    } catch (Exception ex) {
        System.out.println(ex);
    }
} else {
    out.println("<html>");
    out.println("<head>");
    out.println("<title>Servlet upload</title>");
    out.println("</head>");
    out.println("<body>");
    out.println("<p>No file uploaded</p>");
    out.println("</body>");
    out.println("</html>");
}
%>

the output is getting printed as No File Uploaded

Thank you

Neeraj Jain · Accepted Answer · 2015-02-08 11:50:56Z

1

When you make a POST request, you have to encode the data that forms the body of the request in some way.

HTML forms provide three methods of encoding.

application/x-www-form-urlencoded (the default)
multipart/form-data
text/plain

Use enctype=multipart/form-data when your form includes any <input type="file"> elements.

So Use

<form action="upload_images_result.jsp" method="post" enctype="multipart/form-data">
    <div align="left">
        Select a file: <input type="file" name="file" size="50"
            enctype="multipart/form-data" placeholder="Upload Your Image" />
    </div>
    <br>
    <div>
        <input type="submit" value="Upload File" />
    </div>
</form>

answered Feb 8, 2015 at 11:50

Neeraj Jain

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Comments

wittakarn · Accepted Answer · 2015-02-08 11:46:58Z

1

You use wrong attribute in html. Attribute enctype="multipart/form-data" is only used in tag form as following.

<form action="upload_images_result.jsp"
      method="post" 
      enctype="multipart/form-data">
</form>

Alternative, you can use in tag input type="submit" as following.

<form action="upload_images_result.jsp" 
      method="post">
  <input type="submit" 
         formenctype="multipart/form-data" 
         value="Submit as Multipart/form-data"/>
</form>

answered Feb 8, 2015 at 11:46

wittakarn

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1 Comment

arjun narahari Over a year ago

thanx for replying sir , your first one is also correct

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