Reg :File upload and download from client machine

Question

hi..
anyone help me the way that how to upload and download word
document file from client machine.. i am using j2eeserver1.4 in linux..
i want upload file from client machine(windows) to server(linux.) please
help me . tell me idea regarding..
i have tried this coding.. but i can transfer txt file. only. when i upload mirosoft word file.. it will open with some ascii values with actual content.
<!-- upload.jsp -->
<%@ page import="java.io.*" %>
<%String contentType = request.getContentType();
String file = "";
String saveFile = "";
FileOutputStream fileOut = null;
if ((contentType != null) && (contentType.indexOf("multipart/form-data") >= 0))
DataInputStream in = new DataInputStream(request.getInputStream());
int formDataLength = request.getContentLength();
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
while (totalBytesRead < formDataLength)
byteRead = in.read(dataBytes, totalBytesRead, formDataLength);
totalBytesRead += byteRead;
try { 
file = new String(dataBytes);
saveFile = file.substring(file.indexOf("filename=\"") + 10);
saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
saveFile = saveFile.substring(saveFile.lastIndexOf("/") + 1,saveFile.indexOf("\""));
int lastIndex = contentType.lastIndexOf("=");
String boundary = contentType.substring(lastIndex + 1,contentType.length());
int pos;
pos = file.indexOf("filename=/" + 1);
pos = file.indexOf("\n", pos) + 1;
pos = file.indexOf("\n", pos) + 1;
pos = file.indexOf("\n", pos) + 1;
int boundaryLocation = file.indexOf(boundary, pos) - 4;
int startPos = ((file.substring(0, pos)).getBytes()).length;
int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;
String folder = "/tmp/uploads/";
fileOut = new FileOutputStream(folder + saveFile);
fileOut.write(dataBytes);
fileOut.write(dataBytes, startPos, (endPos - startPos));
fileOut.flush(); } catch(Exception e) {  out.print(e);
} finally
{  try
{fileOut.close();
}catch(Exception err)
%>
please which package will help me to upload word document file with no errror. send me how can use in ftp.. send me some sample program..
Regards..
New User M.Senthil..

Answer 1

Hi,
Well,i don't know whether if this helps people here are not.
It is always a good practise to do it via Servlet and then download content.
The adavantage of doing this is
1). You may not need to pack the downloadable with the .war which you ultimately genrate which ceratinly help us in terms of faster deployment.
3). You may update the new content just by moving a file to the backup folder.
2).One may definately download the content irrespective to the content/file.
Hope example below helps..
Configurations:
In the above example we are assuming that we placing all downlodable file in D:/webapp/downlodables/ and you have configured the same path as a init param with the name "filePath" in your web.xml.
something like the one below.
<servlet>
    <servlet-name>DownloadServlet</servlet-name>
    <servlet-class>com.DownloadServlet</servlet-class>
    <init-param>
       <param-name>filePath</param-name>
       <param-value>D:/webapp/downlodables/</param-name>
       <!--Could use any backup folder Available on your Server-->
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>DownloadServlet</servlet-name>
    <url-pattern>/downloadFile</url-pattern>
</servlet-mapping>DownloadServlet.java:
==================
package com;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.activation.MimetypesFileTypeMap;
*@Author RaHuL
/**Download Servlet
*  which could be accessed downloadFile?fid=fileName
*  or
*  http://HOST_NAME:APPLN_PORT/ApplnContext/downloadFile?fid=fileName
public class DownloadServlet extends HttpServlet{
  private static String filePath = new String();
  private static boolean dirExists = false;
  public void init(ServletConfig config){
      // Acquiring Backup Folder Part
      filePath = config.getInitParameter("filePath");
      dirExists = new File(filePath).exists();      
  private void processAction(HttpServletRequest request,HttpServletResponse response) throws Exception{
       // Some Authentication Checks depending upon requirements.
       // getting fileName which user is requesting for
       String fileName = request.getParameter("fid");
       //Building the filePath
       StringBuffer  tFile = new StringBuffer();
       tFile.append(filePath);    
       tFile.append("fileName"); 
       boolean exists = new File(tFile.toString()).exists();
       // Checking whether the file Exists or not      
       if(exists){
        FileInputStream input = null;
        BufferedOutputStream output = null; 
        int contentLength = 0;
        try{
            // Getting the Mime-Type
            String contentType = new MimetypesFileTypeMap().getContentType(tFile.toString());          
            input = new FileInputStream(tFile.toString());
            contentLength = input.available();
            response.setContentType(contentType);
            response.setContentLength(contentLength);
            response.setHeader("Content-Disposition","attachment;filename="+fileName);
            output = new BufferedOutputStream(response.getOutputStream());
            while ( contentLength-- > 0 ) {
               output.write(input.read());
             output.flush();
          }catch(IOException e) {
                 System.err.println("Exception Occured:"+e.getMessage());
             System.err.println("Exception Localized Message:"+e.getLocalizedMessage());
          } finally {
               if (output != null) {
                   try {
                      output.close();
                  } catch (IOException ie) {
                      System.err.println("Exception Occured:"+e.getMessage());
                         System.err.println("Exception Localized Message:"+e.getLocalizedMessage());                      
       }else{
         response.sendRedirect("/errorPage.html");
  public void doPost(HttpServletRequest request,HttpServletResponse response) throws Exception{       
        processAction(request,response); 
  public void doGet(HttpServletRequest request,HttpServletResponse response) throws Exception{
        processAction(request,response); 
NOTE: Make sure You include activations.jar in your CLASSPATH b4 trying the code.
therefore,if you have something like above set as your application enviroment in the above disccussed
can be done by just giving a simple hyper link like
<a href="downloadFile?fid=fileName.qxd" target="_blank">Download File</a>REGARDS,
RaHuL