erstellen und laden Sie die Zip-Datei Java

Question

In meiner Anwendung gibt es keine Dokumente (pdf) für eine bestimmte Ausschreibung. Ich muss eine ZIP-Datei aus diesen PDF-Dateien erstellen und dem Benutzer erlauben, sie herunterzuladen.

Anwendung erfolgt in JavaEE mit Struts und MySQL. Wenn Benutzer auf den Download-Button klickt, wird diese Aktionsklasse aufgerufen. Der Code enthält keine Ausnahmen, fordert den Benutzer jedoch auch nicht zum Herunterladen auf.

Bitte helfen Sie mir zu finden, was im Code falsch ist.

Es folgt der Quellcode meiner Action-Klasse ..

public class ActDownloadDocZip extends Action { 
static Logger logger = Logger.getLogger(ActDownloadDocZip.class); 

public ActionForward execute(ActionMapping mapping, ActionForm form, 
     HttpServletRequest request, HttpServletResponse response) 
     throws Exception { 
    String realPath = getServlet().getServletContext().getRealPath(
      "/WEB-INF/log4jConfiguration.xml"); 
    DOMConfigurator.configure(realPath); 
    logger.info("In ActDownloadDocZip...."); 
    ActionForward forward = null; 
    HttpSession session = request.getSession(); 
    // get a db connection 
    Connection conn = null; 
    String[][] nameFile = null; 
    String tenderNo = ""; 
    try { 
     conn = ProxoolConnection.getProxoolConnectionSLT(); 
     tenderNo = request.getParameter("tenderNo"); 
     // File fileex=new File("xxx.zip"); 
     FileOutputStream zipFile = new FileOutputStream(new File("xxx.zip")); 
     ZipOutputStream output = new ZipOutputStream(zipFile); 
     // call getPdfFiles method here 
     ILoadTenders ld = new LoadTenders(); 
     nameFile = ld.getPdfFileListToTender(conn, tenderNo);//this method brings back the relevant pdf file names and paths((pdfname1,pdfpath1),(pdfname2,pdfpath2)) 
     for (int i = 0; i < nameFile.length; i++) { 
      ZipEntry zipEntry = new ZipEntry(nameFile[i][0].trim()); 
      output.putNextEntry(zipEntry); 
      FileInputStream pdfFile = new FileInputStream(new File(
        nameFile[i][1].trim())); 
      IOUtils.copy(pdfFile, output); 
      pdfFile.close(); 
      output.closeEntry(); 
     } 
     output.finish(); 
     output.close(); 
    } catch (SQLException e) { 
     System.out.println("actDownloadDocZip " + e); 
     logger.fatal(e.getMessage()); 
    } catch (Exception e) { 
     System.out.println("actDownloadDocZip1 " + e); 
     logger.fatal(e.getMessage()); 
    } finally { 
     if (conn != null) { 
      ProxoolConnection.closeProxoolConnectionSLT(conn); 
     } 
    } 
    forward = mapping.findForward("publicdashboard"); 
    return forward; 
    } 
} 

Answer 1

Fertig :) Ich war schon da ... hatte nur einen richtigen Weg zu geben und es herunterladen ....

hier nochmal die Aktionsklasse:

package com.affno.etender.frontend; 

import java.io.BufferedOutputStream; 
import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.OutputStream; 
import java.sql.Connection; 
import java.sql.SQLException; 
import java.util.zip.ZipEntry; 
import java.util.zip.ZipFile; 
import java.util.zip.ZipOutputStream; 

import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.http.HttpSession; 

import org.apache.commons.io.IOUtils; 
import org.apache.log4j.Logger; 
import org.apache.log4j.xml.DOMConfigurator; 
import org.apache.struts.action.Action; 
import org.apache.struts.action.ActionForm; 
import org.apache.struts.action.ActionForward; 
import org.apache.struts.action.ActionMapping; 
import org.apache.struts.util.MessageResources; 

import com.affno.util.proxool.ProxoolConnection; 

public class ActDownloadDocZip extends Action { 
    static Logger logger = Logger.getLogger(ActDownloadDocZip.class); 

    public ActionForward execute(ActionMapping mapping, ActionForm form, 
      HttpServletRequest request, HttpServletResponse response) 
      throws Exception { 

     String realPath = getServlet().getServletContext().getRealPath(
       "/WEB-INF/log4jConfiguration.xml"); 
     DOMConfigurator.configure(realPath); 
     logger.info("In ActDownloadDocZip...."); 

     ActionForward forward = null; 
     HttpSession session = request.getSession(); 

     // get a db connection 
     Connection conn = null; 

     String[][] nameFile = null; 

     String tenderNo = ""; 

     //// 
     FileOutputStream fos = null; 
     ZipOutputStream zipOut = null; 
     FileInputStream fis = null; 

     MessageResources messages = MessageResources.getMessageResources("resources.Upload"); 
     String dirzip = messages.getMessage("save.dir"); 
     tenderNo = request.getParameter("tenderNo").trim(); 
     String zipFolderName =tenderNo + ".zip"; 
     String filepathzipped = dirzip + zipFolderName; 

     try { 
      conn = ProxoolConnection.getProxoolConnectionSLT(); 



      fos = new FileOutputStream(filepathzipped); 
      zipOut = new ZipOutputStream(new BufferedOutputStream(fos)); 

      ILoadTenders ld = new LoadTenders(); 
      nameFile = ld.getPdfFileListToTender(conn, tenderNo); 

      for (int i = 0; i < nameFile.length; i++){ 
       File input = new File(nameFile[i][1].trim()); 
       fis = new FileInputStream(input); 
       ZipEntry ze = new ZipEntry(input.getName()); 
       System.out.println("Zipping the file: "+input.getName()); 
       zipOut.putNextEntry(ze); 
       byte[] tmp = new byte[4*1024]; 
       int size = 0; 
       while((size = fis.read(tmp)) != -1){ 
        zipOut.write(tmp, 0, size); 
       } 
       zipOut.flush(); 
       fis.close(); 
      } 
      zipOut.close(); 
      System.out.println("Done... Zipped the files..."); 
      //zip created 

      //downloading the zip 
      File file = new File(filepathzipped); 
      if(!file.exists()){ 
       System.out.println("file not found"); 
      } 
      response.setContentType("APPLICATION/OCTET-STREAM"); 
      response.setHeader("Content-Disposition","attachment; filename=\"" + zipFolderName + "\""); 

      OutputStream out = response.getOutputStream(); 
      FileInputStream in = new FileInputStream(file); 
      byte[] buffer = new byte[4096]; 
      int length; 
      while ((length = in.read(buffer)) > 0){ 
       out.write(buffer, 0, length); 
      } 
      in.close(); 
      out.flush(); 

     } 
     //// 
     catch (SQLException e) { 
      System.out.println("actDownloadDocZip " + e); 
      logger.fatal(e.getMessage()); 
     } catch (Exception e) { 
      System.out.println("actDownloadDocZip1 " + e); 
      logger.fatal(e.getMessage()); 
     } finally { 
      if (conn != null) { 
       ProxoolConnection.closeProxoolConnectionSLT(conn); 
      } 
     } 

     forward = mapping.findForward("publicdashboard"); 
     /* 
     * if (forward != null) { forward = new ActionForward(forward.getPath() 
     * +"servlet/DownloadServlet?" + zipFile, true); } 
     */ 
     return forward; 

    } 
}