There are several ways of doing this, below are some of them.

By using commons-fileupload

protected void doPost(
HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 try {    
 List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);  
     for (FileItem item : items) {  
 if (item.isFormField()) {   
String fieldname = item.getFieldName();               
 String fieldvalue = item.getString();              
   // Write Your logic

 } else {              
 // Process form file field (input type="file").           
 String fieldname = item.getFieldName();          
 String filename = FilenameUtils.getName(item.getName()); 
 InputStream filecontent = item.getInputStream();        
   // Write Your logic

 }      
 }  
 } catch (FileUploadException e) {
 throw new ServletException("Cannot parse multipart request.", e); 
 }  
 }

By using Servlet 3.0 MultipartConfig

import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

@WebServlet(urlPatterns = "/MultipartUploadServlet", name = "MultipartUploadServlet")
@MultipartConfig(location = "/tmp", maxFileSize = 10485760L)
public class MultipartYourUploadServlet extends HttpServlet {
        protected void doPost(HttpServletRequest req, HttpServletResponse resp)
                        throws ServletException, IOException {
                try {
                        Enumeration<String> hn = req.getHeaderNames();
                        while (hn.hasMoreElements()) {
                                String n = hn.nextElement();
                                System.out.println(n + " [" + req.getHeader(n) + "]");
                        }
                        Collection<Part> requestParts = req.getParts();

                        InputStream is = req.getInputStream();
                        int charRead = 0;
                        System.out.println("[");
                        while ((charRead = is.read()) != -1) {
                                System.out.print((char) charRead);
                        }
                        is.close();
                        System.out.println("]");
                } catch (Exception excp) {
                        excp.printStackTrace();
                }
        }
}

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