I'm currently developing a JSP/Servlet web application and I am looking to implement file upload functionality with a progress bar within a Servlet context. Below is an example of uploading a file using JSP and Servlet but without the progress bar feature.
The FileUploadHandler.java
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
/**
* Servlet that manages File upload requests from Clients
* @author Javin Paul
*/
public class FileUploadHandler extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
private final String UPLOAD_DIRECTORY = "uploads";
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String uploadPath = getServletContext().getRealPath("")
+ File.separator + UPLOAD_DIRECTORY;
String name = null;
//process only if its multipart content
if(ServletFileUpload.isMultipartContent(request)){
try {
List<FileItem> multiparts = new ServletFileUpload(
new DiskFileItemFactory()).parseRequest(request);
for(FileItem item : multiparts){
if(!item.isFormField()){
name = new File(item.getName()).getName();
item.write( new File(uploadPath+name));
}
}
//File uploaded successfully
request.setAttribute("message", "File Uploaded Successfully "+uploadPath+ name);
} catch (Exception ex) {
request.setAttribute("message", "File Upload Failed due to " + ex);
}
}else{
request.setAttribute("message",
"Sorry this Servlet only handles file upload request");
}
request.getRequestDispatcher("/result.jsp").forward(request, response);
}
}
The upload.jsp
The result.jsp
The web.xml