com.mycompany.mytubeaws.DownloadServlet.java Source code

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Here is the source code for com.mycompany.mytubeaws.DownloadServlet.java

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package com.mycompany.mytubeaws;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.model.GeneratePresignedUrlRequest;
import com.amazonaws.services.s3.model.GetObjectRequest;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.s3.model.S3ObjectInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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;

import javax.activation.MimetypesFileTypeMap;
import javax.servlet.ServletOutputStream;
import org.apache.commons.io.IOUtils;

/**
 *
 * @author Administrator
 */
@WebServlet(name = "DownloadServlet", urlPatterns = { "/DownloadServlet" })
public class DownloadServlet extends HttpServlet {
    private AmazonS3 s3;
    final String bucketName = "darkspock";

    @Override
    public void init() throws ServletException {
        s3 = new AmazonS3Client();
    }

    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String result = "";
        String downloadLink = "";

        String inputKey = request.getParameter("downloadKey");

        if (inputKey == null)
            result += "inputKey is null; ";
        else if (inputKey.length() == 0)
            result += "inputKey is blank; ";
        else {
            result += "Downloading an object; ";

            try {
                //            S3Object object = s3.getObject(new GetObjectRequest(bucketName, inputKey));
                //            S3ObjectInputStream objectContent = object.getObjectContent();
                //            
                //            File f = File.createTempFile("aws-java-sdk-download", "");
                //            FileOutputStream fos = new FileOutputStream(f);
                //            IOUtils.copy(objectContent, fos);
                //            fos.close();
                //            
                //            result += "Content-Type: '" + object.getObjectMetadata().getContentType() + "'; ";
                //            result += "Mime '" + new MimetypesFileTypeMap().getContentType(f) + "'; ";
                //            
                //            response.setContentType(new MimetypesFileTypeMap().getContentType(f));
                //            response.setHeader("Content-Disposition","attachment;filename="+inputKey);
                //            
                //            ServletOutputStream out = response.getOutputStream();
                //            
                //            
                //            f.delete();

                GeneratePresignedUrlRequest requestUrl = new GeneratePresignedUrlRequest(bucketName, inputKey);
                downloadLink = s3.generatePresignedUrl(requestUrl).toString();
                System.out.println(downloadLink);
                //result += downloadLink + " ; ";
            } catch (AmazonServiceException ase) {
                System.out.println("Caught an AmazonServiceException, which means your request made it "
                        + "to Amazon S3, but was rejected with an error response for some reason.");
                System.out.println("Error Message:    " + ase.getMessage());
                System.out.println("HTTP Status Code: " + ase.getStatusCode());
                System.out.println("AWS Error Code:   " + ase.getErrorCode());
                System.out.println("Error Type:       " + ase.getErrorType());
                System.out.println("Request ID:       " + ase.getRequestId());

                result += "AmazonServiceException thrown; ";
            } catch (AmazonClientException ace) {
                System.out.println("Caught an AmazonClientException, which means the client encountered "
                        + "a serious internal problem while trying to communicate with S3, "
                        + "such as not being able to access the network.");
                System.out.println("Error Message: " + ace.getMessage());

                result += "AmazonClientException thrown; ";
            }
        }

        System.out.println(result);

        request.setAttribute("resultText", result);
        request.setAttribute("downloadLink", downloadLink);
        request.getRequestDispatcher("/DownloadResult.jsp").forward(request, response);
        //response.sendRedirect("UploadResult.jsp");
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "MyTube download servlet.";
    }
}