Jason Hunter has written a class called com.oreilly.servlet.MultipartRequest available on Servlets.com

You may need to pass in the location of the "incoming" directory as a servlet initialization parameter.

multi = new MultipartRequest(request, dirName, 10*1024*1024); // 10MB

if(submitButton.equals(multi.getParameter("Submit")))
{
    out.println("Files:");
    Enumeration files = multi.getFileNames();
    while (files.hasMoreElements()) {
	String name = (String)files.nextElement();
	String filename = multi.getFilesystemName(name);
	String type = multi.getContentType(name);
	File f = multi.getFile(name);
	FileReader fs = new FileReader(f);
	BufferedReader in = new BufferedReader(fs);
	String s, s2 = new String();
	while((s = in.readLine())!= null) {
	    s2 += s + "\n";
	}
	fileContent = s2;
	//session.setAttribute("fileContent", fileContent);
	//out.println(in.readLine());
	out.println("name: " + name);
	out.println("filename: " + filename);
	out.println("type: " + type);
	if (f != null) {
	    out.println("f.toString(): " + f.toString());
	    out.println("f.getName(): " + f.getName());
	    out.println("f.exists(): " + f.exists());
	    out.println("f.length(): " + f.length());
	    out.println("fileContent: " + fileContent);
	}
	in.close();
    }
}

Here is my code as a jsp:

<%@ page import="com.jspsmart.upload.*" %>
<jsp:useBean id="ff" class="com.jspsmart.upload.SmartUpload" scope="page" />
<%
	String[] dir = { "C:\\temp\\tip.portal\\","/dp6.2/tip.portal/" };
	String   fn  = request.getParameter("filename");
	String   cn  = request.getParameter("clientno");
	int      id  = -1;


	if ( request.getServerName().equalsIgnoreCase("localhost") ) {
		id = 0;
	}
	else {
		id = 1;
	}

	String fid = dir[id] + cn + java.io.File.separator + fn;

	System.err.println(fid);

	try {
		ff.initialize( pageContext );
		ff.downloadFile( fid,"application/pdf" );
	}
	catch ( java.io.IOException e ) {
		if ( e instanceof java.io.FileNotFoundException ) {
			response.sendRedirect("\tip\file_not_found.html");
		}
		else {
			throw e;
		}
	}
	catch ( Exception e ) {
		e.printStackTrace(System.err);
		throw e;
	}
%>

This gives an error:

2001-09-24 17:18:06 - Ctx( /tip ): IllegalStateException in: R( /tip + /client/docs/view.jsp + null) 
OutputStream is already being used for this request

As a servlet:

package tip;

import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

import com.jspsmart.upload.*;

public class viewClientSiteDocs extends TipServlet{

	private String[] TARGET_DIR = { "C:\\TEMP\\tip.portal\\","/dp6.2/tip.portal/" };

	private ServletConfig config;

	public void init(ServletConfig config) throws ServletException {
		super.init(config);
		this.config = config;
	}

	public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException {
		doGet(req,res);
	}

	public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException {
		String clientno = req.getParameter("clientno");
		String filename = req.getParameter("filename");
		int i = ( req.getServerName().equalsIgnoreCase("localhost") ) ? 0 : 1;
		SmartUpload ff = new SmartUpload();
		try {
			String fid = TARGET_DIR[i] + clientno + java.io.File.separator + filename;
			ff.initialize( config,req,res );
			ff.setForcePhysicalPath(true);
			ff.downloadFile(fid,"application/pdf");
		}
		catch ( SmartUploadException e ) {
			e.printStackTrace(System.err);
		}
		catch ( IOException e ) {
			if ( e instanceof java.io.FileNotFoundException ) {
				try {
					res.sendRedirect("/tip/file_not_found.html");
				}
				catch ( IOException ex ) {
					ex.printStackTrace(System.err);
				}
			}
			else {
				e.printStackTrace(System.err);
			}
		}
		catch ( Exception e ) {
			e.printStackTrace(System.err);
		}
	}
}

It works.

But the servlet mechanism works great. I'm sticking with this approach.