slugmandrew's UploadServiceImpl

package com.utilitiessavings.testapp.server;

import java.io.IOException;
import java.util.Enumeration;
import java.util.Map;

import javax.inject.Inject;
import javax.inject.Singleton;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.api.blobstore.BlobKey;
import com.google.appengine.api.blobstore.BlobstoreService;
import com.google.appengine.api.blobstore.BlobstoreServiceFactory;
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.EntityNotFoundException;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;
import com.utilitiessavings.testapp.shared.BlobFile;

//The FormPanel must submit to a servlet that extends HttpServlet
//RemoteServiceServlet cannot be used
@Singleton
@SuppressWarnings("serial")
public class UploadServiceImpl extends HttpServlet
{
    // Start Blobstore and Objectify Sessions
    BlobstoreService blobstoreService = BlobstoreServiceFactory.getBlobstoreService();
    DatastoreService datastoreService = DatastoreServiceFactory.getDatastoreService();

    @Inject
    static Dao dao;

    // @Inject
    public UploadServiceImpl()
    {
        super();

        System.out.println("UploadServiceImpl constructed");

        // this.dao = dao;
    }


    // @Override
    // public void init() throws ServletException
    // {
    // super.init();
    //
    // System.out.println("UploadServiceImpl init");
    // }

    // Override the doPost method to store the Blob's meta-data
    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
    {
        // Map<String, List<BlobKey>> blobs = blobstoreService.getUploads(req);
        Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req);
        BlobKey blobKey = blobs.get("upload"); // 'upload' is the name of the FileUpload entity

        // Get the parameters from the request to populate the Picture object
        BlobFile blobFile = new BlobFile();

        // use low-level API to get filesize from BlobInfo entity
        Long filesize = new Long(0);
        Entity entity = null;
        Key k = KeyFactory.createKey("__BlobInfo__", blobKey.getKeyString());

        try
        {
            entity = datastoreService.get(k);
        }
        catch(EntityNotFoundException e)
        {
            e.printStackTrace();
        }

        filesize = (Long) entity.getProperty("size");
        blobFile.setFilesize(filesize); // sets filesize as Long

        // Map the fileURL to the blobservice servlet, which will serve the image
        blobFile.setFileUrl("/testapp4/blobservice?blob-key=" + blobKey.getKeyString());
        blobFile.setBlobKey(blobKey.getKeyString());

        // set the filename and supplierCode fields from the hidden form fields
        blobFile.setFilename(req.getParameter("filename"));
        blobFile.setSupplierCode(req.getParameter("supplierCode"));

        // set the category from the ListBox
        blobFile.setCategory(req.getParameter("category"));
        blobFile.setUser(req.getParameter("user"));

        Enumeration<?> e = req.getParameterNames();
        while(e.hasMoreElements())
        {
            System.out.println(e.nextElement());
        }

        dao.put(blobFile);

        // Redirect recursively to this servlet (calls doGet)
        res.sendRedirect("/testapp4/uploadservice?id=" + blobFile.getId());
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
    {

        // Send the meta-data id back to the client in the HttpServletResponse response
        String id = req.getParameter("id");
        resp.setHeader("Content-Type", "text/html");
        resp.getWriter().println(id);

    }

}