Jsessionid JSP and applet

[Raymond Champion]

Hello friends,

I have an application that uses jsp with JFileUpload applet. How do I maintain the JSESSIONID created when the application first requests from the server? When the applet is run, a different JSESSIONID is created and used for uploading the files. I am setting a session attribute of the username before invoking the applet. After the applet gets invoked, the previous session is no longer available to the applet and therefore the session attribute I need is no longer available.

Code snippet from the jsp(fileupload.jsp) calling the javascript to invoke the applet.

 </tr>
            <tr>
                <td align="center"><p><br>
                        <!-- JFileUpload Applet : Begin copy/paste -->
                        <script src="applet_http.js">

                      </script>
               

The following is the applet_http.js

   <!--
var _info = navigator.userAgent;
var _ns = false;
var _ns6 = false;
var _ie = (_info.indexOf("MSIE") > 0 && _info.indexOf("Win") > 0 && _info.indexOf("Windows 3.1") < 0);
if (_info.indexOf("Opera") > 0) _ie = false;
var _ns = (navigator.appName.indexOf("Netscape") >= 0 && ((_info.indexOf("Win") > 0
 && _info.indexOf("Win16") < 0) || (_info.indexOf("Sun") > 0) || (_info.indexOf("Linux") > 0) 
|| (_info.indexOf("AIX") > 0) || (_info.indexOf("OS/2") > 0) || (_info.indexOf("IRIX") > 0)));
var _ns6 = ((_ns == true) && (_info.indexOf("Mozilla/5") >= 0));
if (_ie == true) {
  document.writeln('<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" 
WIDTH="250" HEIGHT="250" NAME="fileupload"
 codebase="http://java.sun.com/update/1.4.2/jinstall-1_4-windows-i586.cab#Version=1,4,0,0">');
}
else if (_ns == true && _ns6 == false) { 
  // BEGIN: Update parameters below for NETSCAPE 3.x and 4.x support.
  document.write('<EMBED ');
  document.write('type="application/x-java-applet;version=1.4" ');
  document.write('CODE="jfileupload.upload.client.MApplet.class" ');
  document.write('JAVA_CODEBASE="./" ');
  document.write('ARCHIVE="lib/jfileupload.jar,lib/httpimpl.jar,lib/chttpclient.jar,lib/clogging.jar" ');
  document.write('NAME="fileupload" ');
  document.write('WIDTH="650" ');
  document.write('HEIGHT="250" ');
  document.write('url="http://localhost:8087/CmeJfileUploadDemo/process.jsp" ');
  //document.write('url="http://12.144.92.205:8080/CmeJfileUploadDemo/directoryCreatorFilter.java" ');
  document.write('paramfile="uploadfile" ');
  document.write('param1="todo" ');
  document.write('value1="upload" ');
  document.write('folderdepth="5"');
  document.write('param2="relativefilename"');
  document.write('value2="true"');
  document.write('param3="cookiename"');
  document.write('value3="JSESSIONID"');
  document.write('param4="cookievalue"');
  document.write('value4="abc123"');
  document.write('mode="http" ');
  document.write('authentication="true"');
  document.write('scriptable=true ');
  document.write('resources=i18n.properties ');
  document.writeln('pluginspage="http://java.sun.com/products/plugin/index.html#download"><NOEMBED>');
  // END
}
else {
  document.writeln('<APPLET CODE="jfileupload.upload.client.MApplet.class" 
JAVA_CODEBASE="./" ARCHIVE="lib/jfileupload.jar,lib/httpimpl.jar,lib/chttpclient.jar,lib/clogging.jar" 
WIDTH="650" HEIGHT="250" NAME="fileupload">');
}
// BEGIN: Update parameters below for INTERNET EXPLORER, FIREFOX, SAFARI, OPERA, MOZILLA, NETSCAPE 6+ support.
document.writeln('<PARAM NAME=CODE VALUE="jfileupload.upload.client.MApplet.class">');
document.writeln('<PARAM NAME=CODEBASE VALUE="./">');
document.writeln('<PARAM NAME=ARCHIVE VALUE="lib/jfileupload.jar,lib/httpimpl.jar,lib/chttpclient.jar,lib/clogging.jar">');
document.writeln('<PARAM NAME=NAME VALUE="fileupload">');
document.writeln('<PARAM NAME="type" VALUE="application/x-java-applet;version=1.4">');
document.writeln('<PARAM NAME="scriptable" VALUE="true">');
document.writeln('<PARAM NAME="url" VALUE="http://localhost:8087/CmeJfileUploadDemo/process.jsp;jsessionid=abc123">');
//document.writeln('<PARAM NAME="url" VALUE="http://12.144.92.205:8080/CmeJfileUploadDemo/directoryCreatorFilter.java">');
document.writeln('<PARAM NAME="paramfile" VALUE="uploadfile">');
document.writeln('<PARAM NAME="param1" VALUE="todo">');
document.writeln('<PARAM NAME="value1" VALUE="upload">');
document.writeln('<PARAM NAME="folderdepth" VALUE="5">');
document.writeln('<PARAM NAME="param2" VALUE="relativefilename">');
document.writeln('<PARAM NAME="value2" VALUE="true">');
document.writeln('<PARAM NAME="param3" VALUE="cookiename">');
document.writeln('<PARAM NAME="value3" VALUE="JSESSIONID">');
document.writeln('<PARAM NAME="param4" VALUE="cookievalue">');
document.writeln('<PARAM NAME="value4" VALUE="abc123">');
document.writeln('<PARAM NAME="authentication" VALUE="true">');
document.writeln('<PARAM NAME="mode" VALUE="http">');
document.writeln('<PARAM NAME="resources" VALUE="i18n.properties">');
// END
if (_ie == true) {
  document.writeln('</OBJECT>');
}
else if (_ns == true && _ns6 == false) {
  document.writeln('</NOEMBED></EMBED>');
}
else {
  document.writeln('</APPLET>');
}
//-->
 

The following process.jsp

 <%@ page language="java" import="jfileupload.jspupload.*,java.util.*,java.io.*"%>
<%@ page errorPage="ExceptionHandler.jsp"%>

<!-- These snippets are for the cluster directory -->
<!--  "/tmp/uploads"; -->
<!--  "/tmp/uploads/tmp"; -->

<!-- These snippets are for the localhost testing -->
<!-- "c:/uploads"; -->
<!-- "c:/uploads/tmp"; -->


<% String directory = "c:/uploads"; %>
<% String tmpdirectory = "c:/uploads/tmp"; %>
<% boolean createsubfolders = true; %>
<% boolean allowresume = true; %>
<% boolean allowoverwrite = true; %>
<% String encoding = "ISO-8859-1"; %>
<% boolean keepalive = false; %>

<jsp:useBean id="upBean" scope="page" class="jfileupload.jspupload.FileUploadBean">
	<jsp:setProperty name="upBean" property="folderstore" value="<%= directory %>" />
	<jsp:setProperty name="upBean" property="parsertmpdir" value="<%= tmpdirectory %>" />
	<jsp:setProperty name="upBean" property="filesizelimit" value="99999999999" />
	<jsp:setProperty name="upBean" property="overwrite" value="<%= allowoverwrite %>" />
	<jsp:setProperty name="upBean" property="dump" value="true" />
</jsp:useBean>

<%
	//request.setCharacterEncoding(encoding);
	//response.setContentType("text/html; charset="+encoding);
	String method = request.getMethod();
	// Head processing to support resume and overwrite features.
	if (method.equalsIgnoreCase("head"))
	{
		String filename = request.getHeader("relativefilename");
               // request.setAttribute("GET_RELATIVEFILENAME", filename);

		if (filename == null) filename = request.getHeader("filename");
               //request.setAttribute("GET_FILENAME", filename);
               //System.out.println(request.getAttribute(filename));

		if (filename != null)
		{
			if (keepalive == false) response.setHeader("Connection", "close");
			String account = request.getHeader("account");
                       // System.out.println("account: "+account);

			if (account == null) account = "";
			else if (!account.startsWith("/")) account = "/" + account;
			File fhead = new File(directory + account + "/" + filename);
			if (fhead.exists())
			{
				response.setHeader("size", String.valueOf(fhead.length()));
				String checksum = request.getHeader("checksum");
				if ((checksum != null) && (checksum.equalsIgnoreCase("crc")))
				{
					long crc = upBean.computeCRC32(fhead, -1);
					if (crc != -1) response.setHeader("checksum", String.valueOf(crc));
				} 
				else if ((checksum != null) && (checksum.equalsIgnoreCase("md5")))
				{
					String md5 = upBean.hexDump(upBean.computeMD5(fhead, -1)).toLowerCase();
					if ((md5 != null) && (!md5.equals(""))) response.setHeader("checksum", md5);
				}
			} 
			else response.sendError(HttpServletResponse.SC_NOT_FOUND);
			return;
		}
	}
%>
<html>
<head>
<title>Upload file: JSPScript sample</title>
<meta http-equiv="Content-Type" content="text/html; charset=<%= encoding %>">
</head>
<body>
    
    <%
    System.out.println("Session id in process.jsp"+session.getId());

    System.out.println("userLogin = "+session.getAttribute("login"));

    %>
<ul>
	<%
		if (MultipartFormDataRequest.isMultipartFormData(request))
		{
			// Parse multipart HTTP POST request.
			MultipartFormDataRequest mrequest = null;
			try
			{
				mrequest = new MultipartFormDataRequest(request, null, -1, MultipartFormDataRequest.CFUPARSER, encoding, allowresume);
			} 
			catch (Exception e)
			{
				// Cancel current upload (e.g. Stop transfer)
				// Only if allowresume = false
			}
			String todo = null;
			if (mrequest != null) todo = mrequest.getParameter("todo");
			if ((todo != null) && (todo.equalsIgnoreCase("upload")))
			{
				String account = mrequest.getParameter("account");
				if (account == null) account = "";
				else if (!account.startsWith("/")) account = "/" + account;
				upBean.setFolderstore(directory + account);
				Hashtable files = mrequest.getFiles();
				if ((files != null) && (!files.isEmpty()))
				{
					UploadFile file = (UploadFile) files.get("uploadfile");
					if (file != null) out.println("<li>Form field: uploadfile" +
 "<BR> Uploaded file: " + file.getFileName() + " (" + file.getFileSize() + " bytes)" 
+ "<BR> Content Type: " + file.getContentType());
					// Folders and subfolders creation support.
					String relative = mrequest.getParameter("relativefilename");
					if ((createsubfolders == true) && (relative != null))
					{
						int inda = relative.length();
						int indb = file.getFileName().length();
						if (inda > indb)
						{
							String subfolder = relative.substring(0, (inda - indb) - 1);
							subfolder = subfolder.replace('\\', '/').replace('/', java.io.File.separatorChar);
							upBean.setFolderstore(directory + account + java.io.File.separator + subfolder);
						}
					}
					if (keepalive == false) response.setHeader("Connection", "close");
					// Chunks recomposion support.
					String chunkidStr = mrequest.getParameter("chunkid");
					String chunkamountStr = mrequest.getParameter("chunkamount");
					String chunkbaseStr = mrequest.getParameter("chunkbase");
					if ((chunkidStr != null) && (chunkamountStr != null) && (chunkbaseStr != null))
					{
						// Always overwrite chunks.
						upBean.store(mrequest, "uploadfile");
						int chunkid = Integer.parseInt(chunkidStr);
						int chunkamount = Integer.parseInt(chunkamountStr);
						if (chunkid == chunkamount)
						{
							// recompose file.
							String fname = upBean.getFolderstore() + java.io.File.separator + chunkbaseStr;
							File fread = new File(fname);
							if (fread.canRead() && (upBean.getOverwrite() == false)) fname = fname + "." + System.currentTimeMillis();
							FileOutputStream fout = new FileOutputStream(fname);
							byte[] buffer = new byte[4096];
							for (int c = 1; c <= chunkamount; c++)
							{
								File filein = new File(upBean.getFolderstore() + java.io.File.separator + chunkbaseStr + "." + c);
								FileInputStream fin = new FileInputStream(filein);
								int read = -1;
								while ((read = fin.read(buffer)) > 0) fout.write(buffer, 0, read);
								fin.close();
								filein.delete();
							}
							fout.close();
						}
					} 
					else upBean.store(mrequest, "uploadfile");
					upBean.setFolderstore(directory + account);
				} 
				else
				{
					String emptydirectory = mrequest.getParameter("emptydirectory");
					if ((emptydirectory != null) && (!emptydirectory.equals("")))
					{
						File dir = new File(directory + account + "/" + emptydirectory);
						dir.mkdirs();
					}
					out.println("<li>No uploaded files");
				}
			} 
			else out.println("<BR> todo=" + todo);
		}
	%>
</ul>
</body>
</html>
   

I think my question is can I make the JSESSIONID from the intitial session creation available to the applet, and therefore the session, instead of the applet getting another JSESSIONID from the server?

I don't have access to the JFileUPload source code, so I can't modify that, unless I purchase the Premium edition for $499.00.

Thanks for any insight into this issue.

Ray

[Raymond Champion]

Let me try to be more clear. I am creating a session variable of username when user logs in. I am using the JSESSIONID that is sent from the server when the user firsts logs in. When I get to the jsp with the JFileUPload applet in it, the applet gets another JSESSIONID from the server and the previous session varaible is no longer available and I need it to create a specific directory to store the uploaded files.

Any ideas???