title: Servlet get parameter from multipart form in tomcat 7
body: <p>Making a project and need file upload.
  So, i am using enctype="multipart/form-data"  inform.</p>
  
  <p>But i unable to parse parameters from request.
  I also tried getPart but it returning blank string.</p>
  
  <p>Servlet code --></p>
  
  <pre><code>import java.io.File;
  import java.io.IOException;
  import java.io.PrintWriter;
  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;
  
  public class upload_wall extends HttpServlet {
      private static final long serialVersionUID = 1L;
      // location to store file uploaded
      private static final String UPLOAD_DIRECTORY = "image_upload";
      // upload settings
      private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3;  // 3MB
      private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
      private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
  
      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
          response.setContentType("text/html");
          PrintWriter out = response.getWriter();
  
          // checks if the request actually contains upload file
          if (!ServletFileUpload.isMultipartContent(request)) {
              // 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 = getServletContext().getRealPath("") + File.separator + UPLOAD_DIRECTORY;
  
          // creates the directory if it does not exist
          File uploadDir = new File(uploadPath);
          if (!uploadDir.exists()) {
              uploadDir.mkdir();
          }
  
          try {
              @SuppressWarnings("unchecked")
              List&lt;FileItem&gt; formItems = upload.parseRequest(request);
              String fileName1 = "";
              if (formItems != null &amp;&amp; formItems.size() &gt; 0) {
                  for (FileItem item : formItems) {
                      // processes only fields that are not form fields
                      if (!item.isFormField()) {
                          String fileName = new File(item.getName()).getName();
                          fileName1 += fileName;
                          String filePath = uploadPath + File.separator + fileName;
                          File storeFile = new File(filePath);
                          // saves the file on disk
                          item.write(storeFile);
                      }
                  }
              }
              String p_text = request.getParameter("p_data");
              String gallery_nm = request.getParameter("upload_wall_gallery");
              out.println(p_text);
              out.println(gallery_nm);
              //out.println("Upload has been done successfully!"+fileName1);
          } catch (Exception ex) {
              out.println(ex.getMessage());
          }
  
      }
  
  }
  </code></pre>
  
  <p>I unable to find a working example on net or stackoverflow.</p>
  
  <p>Any simple solution?</p>