How to download a file using servlet

I have a problem about downloading a file using a servlet.
Anybody can help me?
Thanks

I am assuming that you want to write a servlet that, when invoked by a user (for instance, through a URL link), will download a file using the "save as" dialog (on Windows, for example) in the user's browser.
In such a case, all you need to do is get the OutputStream from the response object, set the proper MIME type header, and write the file. Here is an (untested, not even compiled) skeleton.
public class MyServlet extends HttpServlet {
protected void doGet (HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
ServletOutputStream out = resp.getOutputStream ();
resp.setContentType ("application/x-foobar");
while (/* whatever */) {
In this loop, you generate your "file's" data.
You can compute it on the fly, pull it from a database,
read it from a "real" file, or any other means you can dream up.
The sample line below just writes some of the data (for example,
a byte array) to the user's browser via the output stream out.
out.write (data);
out.flush ();
Go to http://java.sun.com/j2ee/sdk_1.3/techdocs/api/index.html
for the JavaDoc on the classes used.
Cheers!
Jerry Oberle

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Download a file using servlet

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i need to download a file using servlet (jsp frontend) and if the download is successful, then a success message shud be displayed on the jsp.
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Hi,
You can check :-
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R S

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My scenario is like this:
<b>FILE-->XI-->J2EE Application</b>
XI sends the xml file to j2ee application. My servlet receives the file in HTTPRequest string.
How to parse that file using servlets.I should get the xml file as it is and should be displayed in the browser.
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How to download a file version from office 365 using csom

I need to download an older file version from office 365 and get the data into a byte array. I have no trouble downloading the latest version with File.OpenBinaryStream() and I have no trouble loading the previous file versions with File.Versions. But now
I need to actually download an older version of the file and it seems the only way is to use File.OpenBinaryDirect. So I am creating a client context using my oAuth access token and providing the correct path, but I am getting a (401) Unauthorized
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context = TokenHelper.GetClientContextWithAccessToken(SPHostUrl, AccessToken);
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//leading slash required otherwise ArgumentOutOfRangeException
I have to be able to access the older file versions with my c# code -- I don't have a viable app without that ability -- any help urgently needed and greatly appreciated!

Thank you SO much (Can't wait for the next release)!
For anyone else who lands here, here's the code I ended up using:
// VersionAccessUser and VersionAccessPassword are stored in web.config
// web.Url is loaded via the clientContext
// myVersion is the FileVersion I got from the file's Versions.GetById() method
// probably a lot of ways to get hostUrl, it just needs to be https://yourdomain.sharepoint.com/
// - I'm running my app from a subweb
// I had trouble following the links to get the full MsOnlineClaimsHelper code
// (the one on msdn.com was missing RequestBodyWriter, WSTrustFeb2005ContractClient,
// and IWSTrustFeb2005Contract
// so I've included the code I used here.
string myVersionFullUrl = string.Format("{0}/{1}", web.Url, myVersion.Url);
string userName = WebConfigurationManager.AppSettings.Get("VersionAccessUser");
string strPassword = WebConfigurationManager.AppSettings.Get("VersionAccessPassword");
string hostUrl = Regex.Replace(web.Url, "([^/]+//[^/]+/).*", "$1");
MsOnlineClaimsHelper claimsHelper = new MsOnlineClaimsHelper(hostUrl, userName, strPassword);
var client = new WebClient();
client.Headers["Accept"] = "/";
client.Headers.Add(HttpRequestHeader.UserAgent, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
client.Headers.Add(HttpRequestHeader.Cookie, claimsHelper.CookieContainer.GetCookieHeader(new Uri(hostUrl)));
var document = client.DownloadString(myVersionFullUrl);
// These classes are needed to download old versions of files (see: http://social.msdn.microsoft.com/Forums/en-US/7746d857-d351-49cc-b2f0-496663239e02/how-to-download-a-file-version-from-office-365-using-csom?forum=sharepointdevelopment)
// I cobbled this file from http://social.technet.microsoft.com/Forums/msonline/en-US/4e304493-7ddd-4721-8f46-cb7875078f8b/problem-logging-in-to-office-365-sharepoint-online-from-webole-hosted-in-the-cloud?forum=onlineservicessharepoint
// and http://fredericloud.com/2011/01/11/connecting-to-sharepoint-with-claims-authentication/
using Microsoft.IdentityModel.Protocols.WSTrust;
using Microsoft.SharePoint.Client;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Text;
using System.Web;
using System.Xml;
using System.Xml.Linq;
namespace DPSiDoxAppWeb.Helpers
/// <summary>
/// Create a new contract to use for issue claims for the SharePoint requests
/// </summary>
[ServiceContract]
public interface IWSTrustFeb2005Contract
[OperationContract(ProtectionLevel = ProtectionLevel.EncryptAndSign,
Action = "http://schemas.xmlsoap.org/ws/2005/02/trust/RST/Issue",
ReplyAction = "http://schemas.xmlsoap.org/ws/2005/02/trust/RSTR/Issue",
AsyncPattern = true)]
IAsyncResult BeginIssue(Message request, AsyncCallback callback, object state);
Message EndIssue(IAsyncResult asyncResult);
/// <summary>
/// Implement the client contract for the new type
/// </summary>
public class WSTrustFeb2005ContractClient : ClientBase<IWSTrustFeb2005Contract>, IWSTrustFeb2005Contract
public WSTrustFeb2005ContractClient(Binding binding, EndpointAddress remoteAddress)
: base(binding, remoteAddress)
public IAsyncResult BeginIssue(Message request, AsyncCallback callback, object state)
return Channel.BeginIssue(request, callback, state);
public Message EndIssue(IAsyncResult asyncResult)
return Channel.EndIssue(asyncResult);
/// <summary>
/// Create a class that will serialize the token into the request
/// </summary>
class RequestBodyWriter : BodyWriter
readonly WSTrustRequestSerializer _serializer;
readonly RequestSecurityToken _rst;
/// <summary>
/// Constructs the Body Writer.
/// </summary>
/// <param name="serializer">Serializer to use for serializing the rst.</param>
/// <param name="rst">The RequestSecurityToken object to be serialized to the outgoing Message.</param>
public RequestBodyWriter(WSTrustRequestSerializer serializer, RequestSecurityToken rst)
: base(false)
if (serializer == null)
throw new ArgumentNullException("serializer");
_serializer = serializer;
_rst = rst;
/// <summary>
/// Override of the base class method. Serializes the rst to the outgoing stream.
/// </summary>
/// <param name="writer">Writer to which the rst should be written.</param>
protected override void OnWriteBodyContents(XmlDictionaryWriter writer)
_serializer.WriteXml(_rst, writer, new WSTrustSerializationContext());
public class MsOnlineClaimsHelper
#region Properties
readonly string _username;
readonly string _password;
readonly bool _useRtfa;
readonly Uri _host;
CookieContainer _cachedCookieContainer = null;
DateTime _expires = DateTime.MinValue;
#endregion
#region Constructors
public MsOnlineClaimsHelper(string host, string username, string password)
: this(new Uri(host), username, password)
public MsOnlineClaimsHelper(Uri host, string username, string password)
_host = host;
_username = username;
_password = password;
_useRtfa = true;
public MsOnlineClaimsHelper(Uri host, string username, string password, bool useRtfa)
_host = host;
_username = username;
_password = password;
_useRtfa = useRtfa;
#endregion
#region Constants
public const string office365STS = "https://login.microsoftonline.com/extSTS.srf";
public const string office365Login = "https://login.microsoftonline.com/login.srf";
public const string office365Metadata = "https://nexus.microsoftonline-p.com/federationmetadata/2007-06/federationmetadata.xml";
public const string wsse = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd";
public const string wsu = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd";
private const string userAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)";
#endregion
class MsoCookies
public string FedAuth { get; set; }
public string rtFa { get; set; }
public DateTime Expires { get; set; }
public Uri Host { get; set; }
// Method used to add cookies to CSOM
public void clientContext_ExecutingWebRequest(object sender, WebRequestEventArgs e)
e.WebRequestExecutor.WebRequest.CookieContainer = getCookieContainer();
//e.WebRequestExecutor.WebRequest.UserAgent = userAgent;
// Creates or loads cached cookie container
CookieContainer getCookieContainer()
if (_cachedCookieContainer == null || DateTime.Now > _expires)
// Get the SAML tokens from SPO STS (via MSO STS) using fed auth passive approach
MsoCookies cookies = getSamlToken();
if (cookies != null && !string.IsNullOrEmpty(cookies.FedAuth))
// Create cookie collection with the SAML token
_expires = cookies.Expires;
CookieContainer cc = new CookieContainer();
// Set the FedAuth cookie
Cookie samlAuth = new Cookie("FedAuth", cookies.FedAuth)
Expires = cookies.Expires,
Path = "/",
Secure = cookies.Host.Scheme == "https",
HttpOnly = true,
Domain = cookies.Host.Host
cc.Add(samlAuth);
if (_useRtfa)
// Set the rtFA (sign-out) cookie, added march 2011
Cookie rtFa = new Cookie("rtFA", cookies.rtFa)
Expires = cookies.Expires,
Path = "/",
Secure = cookies.Host.Scheme == "https",
HttpOnly = true,
Domain = cookies.Host.Host
cc.Add(rtFa);
_cachedCookieContainer = cc;
return cc;
return null;
return _cachedCookieContainer;
public CookieContainer CookieContainer
get
if (_cachedCookieContainer == null || DateTime.Now > _expires)
return getCookieContainer();
return _cachedCookieContainer;
private MsoCookies getSamlToken()
MsoCookies ret = new MsoCookies();
try
var sharepointSite = new
Wctx = office365Login,
Wreply = _host.GetLeftPart(UriPartial.Authority) + "/_forms/default.aspx?wa=wsignin1.0"
//get token from STS
string stsResponse = getResponse(office365STS, sharepointSite.Wreply);
// parse the token response
XDocument doc = XDocument.Parse(stsResponse);
// get the security token
var crypt = from result in doc.Descendants()
where result.Name == XName.Get("BinarySecurityToken", wsse)
select result;
// get the token expiration
var expires = from result in doc.Descendants()
where result.Name == XName.Get("Expires", wsu)
select result;
ret.Expires = Convert.ToDateTime(expires.First().Value);
HttpWebRequest request = createRequest(sharepointSite.Wreply);
byte[] data = Encoding.UTF8.GetBytes(crypt.FirstOrDefault().Value);
using (Stream stream = request.GetRequestStream())
stream.Write(data, 0, data.Length);
stream.Close();
using (HttpWebResponse webResponse = request.GetResponse() as HttpWebResponse)
// Handle redirect, added may 2011 for P-subscriptions
if (webResponse.StatusCode == HttpStatusCode.MovedPermanently)
HttpWebRequest request2 = createRequest(webResponse.Headers["Location"]);
using (Stream stream2 = request2.GetRequestStream())
stream2.Write(data, 0, data.Length);
stream2.Close();
using (HttpWebResponse webResponse2 = request2.GetResponse() as HttpWebResponse)
ret.FedAuth = webResponse2.Cookies["FedAuth"].Value;
ret.rtFa = webResponse2.Cookies["rtFa"].Value;
ret.Host = request2.RequestUri;
else
ret.FedAuth = webResponse.Cookies["FedAuth"].Value;
ret.rtFa = webResponse.Cookies["rtFa"].Value;
ret.Host = request.RequestUri;
catch (Exception ex)
return null;
return ret;
static HttpWebRequest createRequest(string url)
HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.CookieContainer = new CookieContainer();
request.AllowAutoRedirect = false; // Do NOT automatically redirect
request.UserAgent = userAgent;
return request;
private string getResponse(string stsUrl, string realm)
RequestSecurityToken rst = new RequestSecurityToken
RequestType = WSTrustFeb2005Constants.RequestTypes.Issue,
AppliesTo = new EndpointAddress(realm),
KeyType = WSTrustFeb2005Constants.KeyTypes.Bearer,
TokenType = Microsoft.IdentityModel.Tokens.SecurityTokenTypes.Saml11TokenProfile11
WSTrustFeb2005RequestSerializer trustSerializer = new WSTrustFeb2005RequestSerializer();
WSHttpBinding binding = new WSHttpBinding();
binding.Security.Mode = SecurityMode.TransportWithMessageCredential;
binding.Security.Message.ClientCredentialType = MessageCredentialType.UserName;
binding.Security.Message.EstablishSecurityContext = false;
binding.Security.Message.NegotiateServiceCredential = false;
binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None;
EndpointAddress address = new EndpointAddress(stsUrl);
using (WSTrustFeb2005ContractClient trustClient = new WSTrustFeb2005ContractClient(binding, address))
trustClient.ClientCredentials.UserName.UserName = _username;
trustClient.ClientCredentials.UserName.Password = _password;
Message response = trustClient.EndIssue(
trustClient.BeginIssue(
Message.CreateMessage(
MessageVersion.Default,
WSTrustFeb2005Constants.Actions.Issue,
new RequestBodyWriter(trustSerializer, rst)
null,
null));
trustClient.Close();
using (XmlDictionaryReader reader = response.GetReaderAtBodyContents())
return reader.ReadOuterXml();

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DATA: v_pass_path TYPE string.
append itab.
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append itab.
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t_header-name = 'Field2'.
append t_header.
t_header-name = 'Field3'.
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means that uploading files(.doc) or any files by using servlets and jsps

yawmark wrote:
saichand wrote:
means that uploading files(.doc) or any files by using servlets and jsps
[http://www.google.com/search?q=How+can+i+upload+files+in+servlets+and+also+using+jsp]
~Good topic titles are indeed brilliant search keywords. It's sad to see that it won't even come in the mind of the topicstarters to Google it before posting the topic.

Can u please send me a sample code to upload and download a file using java

Hi,
Please can u send me a sample code to upload a file and to download the same file from a remote server using a java servlets. The file should be read byte by byte.
Message was edited by:
user461713

Hi, Thank u.
Sorry, I forgot to attach a code. Here it is.
Actually i need to upload a file to a remote server and download it from a server to my machine. I'm trying it using servlets and using tomcat5.0 as a servlet container. Here i'm sening a code used to upload a file. Let me know whether it works. Only few lines are here.
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.lang.Object;
import java.util.*;
import java.lang.String;
import com.oreilly.servlet.MultipartRequest;
public class FileUpload extends HttpServlet{
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     InputStream in=null;
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try{
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bis=new BufferedInputStream(in);
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          i=bis.read();
          while (i != -1) {
fw.write(i);
i = bis.read();
     catch(IOException e){
          System.out.println("Exception=" +e);
finally{
     try{
          if(in!=null)
          in.close();
          if(bis!=null)
          bis.close();
          if(fw!=null)
          fw.close();
     catch(Exception e){
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This code is giving error as: cannot resolve symbol: class MultipartRequest
Why is this happening?
Pls let me know whether this code works or no and also i have written form.html.
Can u pls tel me whether there are ways in which i can write a code to upload a file using servlets without using third party packages. Pls help.
Also how should be the servlet mapping for this code.?
Regards
Message was edited by:
user461713

How to download a file using servlet

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