0

Hi All,

I have to compile a servlet WebStocks.java.
It does not compile in TextPad as it cannot locate the javax.servlet packages. I have done my homework, so I know, that the servlet package I am looking for is loaded in Tomcat in my directory: C:\Program Files\Apache Group\Tomcat 4.1\common\lib\servlet.jar I have added this path as CLASSPATH in my Environment Variables under System Variables. I am using a XP Operating System. Now, I know I need to compile the source code using my Command Prompt screen, but as I am used to TextPad, I am REALLY struggling to get the code to compile.

The commands I have tried are:
javac WebStocks.java
javac CLASSPATH WebStocks.java
javac -CLASSPATH WebStocks.java
javac -classpath "C:\Program Files\Apache Group\Tomcat 4.1\common\lib\servlet.jar" WebStocks.java

The file where I am saving my code is: C:\My Documents\Studies\Chapter12

My questions (apologies if they are stupid):
1) Do I have to be in the directory where I save my .java file (C:\My Documents\Studies\Chapter12)
2) Can I code this path somewhere in my file WebStocks.java, so that i can compile it with Textpad?
3) Clearly my command in the command prompt window is not correct. Where am i going wrong?

I am attaching my Servlet code as well ... in case anyone needs to see it, but i think it is correct ... can tell for sure as the compilation errors all currently seem to be related to the missing javax.servlet package ...

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import java.net.*;

public class WebStocks extends HttpServlet
{
	StockTrackerDB db;

	public void init() throws ServletException
	{
		try
		{
			db = new StockTrackerDB();
		}
		catch (SQLException e)
		{
			System.out.println("WebStocks: SQLException creating new database object.");
			e.printStackTrace();
			System.exit(1);
		}
		catch (ClassNotFoundException e)
		{
			System.out.println("WebStocks: ClassNotFoundException "
							  +"creating new database object.");
			e.printStackTrace();
			System.exit(1);
		}
	}

	public void destroy()
	{
		try
		{
			db.close();
		}
		catch (IOException e)
		{
			System.out.println("WebStocks:IOException closing database.");
			e.printStackTrace();
			System.exit(1);
		}
		catch (SQLException e)
		{
			System.out.println("WebStocks: SQLException closing database.");
			e.printStackTrace();
			System.exit(1);
		}
		catch (ClassNotFoundException e)
		{
			System.out.println("WebStocks: ClassNotFoundException "
							  +"closing database.");
			e.printStackTrace();
			System.exit(1);
		}
	}

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

	public void doPost(HttpServletRequest req, HttpServletResponse res)
						throws ServletException, IOException
	{
		User user = null;
		String userID;
		String password;
		boolean validAction = true;

		res.setContentType("text/html");
		PrintWriter out = res.getWriter();

		res.setHeader("Expires", "Tues, 01 Jan 1980 00:00:00 GMT"); // no cache allowed

		HttpSession session = req.getSession(true); // get current session

		if(logonValidated(req, res, session))
		{
			if(session.getAttribute("uses") != null) // remove temporary data
				session.removeAttribute("uses");

			if(session.getAttribute("userlist") != null)
				session.removeAttribute("userlist");

			if(session.getAttribute("pswdExpired") != null)
				session.removeAttribute("pswdExpired");

			userID = (String)session.getAttribute("userID");

			if(req.getParameter("logout") != null &&
			   req.getParameter("logout").equals("Log out"))
			{
				session.invalidate();
				res.sendRedirect("/index.html");
			}
			else
			{
				try
				{
					String action = req.getParameter("WSaction");
					if(action != null)
					{
						if(action.equals("addStock"))
						{
							addStock(req, session);
						}
						else if(action.equals("addStockDesc"))
						{
							addStockDesc(req, session);
						}
						else if(action.equals("delStock"))
						{
							delStock(req, session);
						}
						else if(action.equals("chgPswd"))
						{
							chgPswd(req, session);
						}
						else if(action.equals("getQuote"))
						{
							String stock = req.getParameter("stockSymbol");
							String quoteRequest = getQuote(stock);
							session.setAttribute("quote",quoteRequest);
							session.setAttribute("forwardTo", "mainForm.jsp");
						}
						else if(action.equals("clearQuote"))
						{
							if(session.getAttribute("quote") != null)
								session.removeAttribute("quote");
							session.setAttribute("forwardTo", "mainForm.jsp");
						}
						else if(action.equals("addUser"))
						{
							addUser(req);
							session.setAttribute("forwardTo", "mainForm.jsp");
						}
						else if(action.equals("reqDelUser"))
						{
							ArrayList userData =
								getUserData(req.getParameter("delUserID"));
							if(userData.size() > 0) // the user exists
							{
								session.setAttribute("userData",userData);
								session.setAttribute("forwardTo", "delUser.jsp");
							}
							else
								session.setAttribute("forwardTo", "badUserID.html");
						}
						else if(action.equals("delUser"))
						{
							delUser(req.getParameter("delUserID"));
							session.setAttribute("forwardTo", "mainForm.jsp");
						}
						else if(action.equals("reqUpdUser"))
						{
							ArrayList userData =
								getUserData(req.getParameter("updUserID"));
							if(userData.size() > 0) // the user exists
							{
								session.setAttribute("userData", userData);
								session.setAttribute("forwardTo", "updUser.jsp");
							}
							else
								session.setAttribute("forwardTo", "badUserID.html");
						}
						else if(action.equals("updUser"))
						{
							updUser(req);
							session.setAttribute("forwardTo", "mainForm.jsp");
						}
						else if(action.equals("listUsers"))
						{
							listUsers(session);
							session.setAttribute("forwardTo", "listUsers.jsp");
						}
						else
							validAction = false;

						if(validAction) // forward to resource
						{
							RequestDispatcher dispatcher =
								getServletContext().getRequestDispatcher("/"+
									(String)session.getAttribute("forwardTo"));
							dispatcher.forward(req, res);
						}
						else
						{
							out.println("<html>");
							out.println("<head>");
							out.println("<title>WebStocks Internal Error</title>");
							out.println("</head>");
							out.println("<body text=\"#824423\" bgcolor=\"white\">");
							out.println("<h1>Internal error</h1>");
							out.println("An invalid action was requested: "+action);
							out.println("</body>");
							out.println("</html>");
						}
					} // end of if action != null
					else
					{
						out.println("<html>");
						out.println("<head>");
						out.println("<title>WebStocks Internal Error</title>");
						out.println("</head>");
						out.println("<body text=\"#824423\"bgcolor=\"white\">");
						out.println("<h1>Internal Error</h1>");
						out.println("A null action was requested.");
						out.println("</body>");
						out.println("</html>");
					}
				} // end  of try
				catch(PasswordException ex)
				{
					out.println("<html>");
					out.println("<head>");
					out.println("<title>WebStocks Password Error</title>");
					out.println("</head>");
					out.println("<body text=\"#824423\"bgcolor=\"white\">");
					out.println("<h1>Invalied Password</h1>");
					out.println(ex.getMessage());
					out.println("</body>");
					out.println("</html>");
				}
				catch(SQLException ex)
				{
					out.println("<html>");
					out.println("<head>");
					out.println("<title>WebStocks Error</title>");
					out.println("</head");
					out.println("<body text=\"#824423\"bgcolor=\"white\">");
					out.println("<h1>SQL Exception</h1>");
					out.println(ex.getMessage());
					out.println("</body>");
					out.println("</html>");
				}
				catch(IOException ex)
				{
					out.println("<html>");
					out.println("<head>");
					out.println("<title>WebStocks Error</title>");
					out.println("</head>");
					out.println("<body text=\"#824423\"bgcolor=\"white\">");
					out.println("<h1>IO Exception</h1>");
					out.println(ex.getMessage());
					out.println("</body>");
					out.println("</html>");
				}
				catch(ClassNotFoundException ex)
				{
					out.println("<html>");
					out.println("<head>");
					out.println("<title>WebStocks Error</title>");
					out.println("</head>");
					out.println("<body text=\"#824423\"bgcolor=\"white\">");
					out.println("<h1>Class not found</h1>");
					out.println(ex.getMessage());
					out.println("</body>");
					out.println("</html>");
				}
			} // end of if log out else
		} // end of if logon validated
	} // end of doGet()

	private boolean logonValidated(HttpServletRequest req, HttpServletResponse res,
								   HttpSession session)
								   throws ServletException, IOException
	{
		User user = null;
		String userID;
		String password;
		boolean valid = false;
		int tries = 0;

		PrintWriter out = res.getWriter();

		//Check if user already logged on for session: if not, attempt to do so
		if(session.getAttribute("userName") == null) // not a validated user
		{
			if(session.getAttribute("attempt") == null) // no previous attempts
				session.setAttribute("attempt", new Integer(0)); // track attempts

			tries = ((Integer)(session.getAttribute("attempt"))).intValue();
			if(tries < 3) // 3 tries
			{
				userID = req.getParameter("userID");
				password = req.getParameter("password");
				if(userID != null && password != null)
				{
					session.setAttribute("userID", userID);
					try
					{
						user = getUser(userID);
						if(validUserPswd(user, password))
						{
							session.setAttribute("userName", user.getFirstName()
												+" "+user.getLastName());
							session.removeAttribute("attempt");

							if(user.pswdIsExpiring())
								session.setAttribute("uses",
												new Integer(user.getPswdUses()));
							if(user.isAdmin())
								session.setAttribute("admin", new Boolean(true));

							session.setAttribute("stocks",
												getStockList(userID));
							// call general screen
							RequestDispatcher dispatcher =
								getServletContext().getRequestDispatcher("/mainForm.jsp");
							dispatcher.forward(req,res);
						}
						else
						{
							throw new PasswordInvalidException("Invalid user id");
						}
					}
					catch(PasswordExpiredException ex)
					{
						session.setAttribute("pswdExpired", "yes");
						session.setAttribute("userName", user.getFirstName()
												+" "+user.getLastName());
						session.setAttribute("pswd", password);
						RequestDispatcher dispatcher =
							getServletContext().getRequestDispatcher("/chgPswd.jsp");
						dispatcher.forward(req, res);
					}
					catch(PasswordInvalidException ex)
					{
						session.setAttribute("attempt", new Integer(++tries));
						ex.resetCount();

						if(tries < 3)
						{
							out.println("<html>");
							out.println("<head>");
							out.println("<title>WebStocks Logon Error</title>");
							out.println("</head>");
							out.println("<body text=\"#824423\"bgcolor=\"white\">");
							out.println("<h1>Invalid User ID or Password</h1>");
							out.println(ex.getMessage());
							out.println("</body>");
							out.println("</html>");
						}
						else              // allows only 3 tries
						{
							out.println("<html>");
							out.println("<head>");
							out.println("<title>WebStocks Logon Error</title>");
							out.println("</head>");
							out.println("<body text=\"#824423\"bgcolor=\"white\">");
							out.println("<h1>Too many attempt to log on!</h1>");
							out.println(ex.getMessage());
							out.println("</body>");
							out.println("</html>");
						}
					}
					catch(PasswordException ex)
					{
						out.println("<html>");
						out.println("<head>");
						out.println("<title>WebStocks Logon Error</title>");
						out.println("</head>");
						out.println("<body text=\"#824423\"bgcolor=\"white\">");
						out.println("<h1>PasswordException</h1>");
						out.println(ex.getMessage());
						out.println("</body>");
						out.println("</html>");
					}
					catch(ClassNotFoundException ex)
					{
						out.println("<html>");
						out.println("<head>");
						out.println("<title>WebStocks Logon Error</title>");
						out.println("</head>");
						out.println("<body text=\"#824423\"bgcolor=\"white\">");
						out.println("<h1>ClassNotFoundException</h1>");
						out.println(ex.getMessage());
						out.println("</body>");
						out.println("</html>");
					}
					catch(SQLException ex)
					{
						out.println("<html>");
						out.println("<head>");
						out.println("<title>WebStocks Logon Error</title>");
						out.println("</head>");
						out.println("<body text=\"#824423\"bgcolor=\"white\">");
						out.println("<h1>SQLException</h1>");
						out.println(ex.getMessage());
						out.println("</body>");
						out.println("</html>");
					}
				}
				else
				{
					out.println("<html>");
					out.println("<head>");
					out.println("<title>WebStocks Logon Error</title>");
					out.println("</head>");
					out.println("<body text=\"#824423\"bgcolor=\"white\">");
					out.println("<h1>Missing User ID or Password</h1>");
					out.println("</body>");
					out.println("</html>");
				}
			}
			else
			{
				out.println("<html>");
				out.println("<head>");
				out.println("<title>WebStocks Logon Error</title>");
				out.println("</head>");
				out.println("<body text=\"#824423\"bgcolor=\"white\">");
				out.println("<h1>Session invalidated</h1><br>"
						+"<h1>The maximum for log on attempts was exceeded!</h1>");
				out.println("</body>");
				out.println("</html>");
			}
		}
		else
			valid = true;

		return valid;
	}

	private String getQuote(String stockSymbol) throws IOException
	{
		StringBuffer buf = new StringBuffer();
		String dataLine;

		try
		{
			// Sends stockSymbol
			// Retrieves s=symbol, l1=price d1=date of last trade t1=time of last trade
			// c1=change (+increase or -decrease) o=open h=high g=low v=volume
			URL servicePage = new URL("http://quote.yahoo.com/d/quotes.csv?symbols="
								  + stockSymbol
								  + "&format=sl1d1t1c1ohgv&ext=csv");

			URLConnection conURL = servicePage.openConnection();
			conURL.connect();
			BufferedReader data =
				new BufferedReader(new InputStreamReader(conURL.getInputStream()));

			while((dataLine = data.readLine()) != null)
				buf.append(dataLine + "\n");
		}
		catch(MalformedURLException ex)
		{
			System.out.println("Bad URL: " + ex.getMessage());
		}

		return buf.toString();
	}

	private void addStock(HttpServletRequest req, HttpSession session)
		throws ClassNotFoundException, IOException, SQLException
	{
		String userID = (String)session.getAttribute("userID");
		String stockSymbol = req.getParameter("stockSymbol");
		String stockDesc = null;
		boolean hasStock = false;

		// determine if user already holds the stock
		ArrayList al = (ArrayList)session.getAttribute("stocks");
		for(int i=0; i < al.size(); ++i)
			if(stockSymbol.equals((String)al.get(i)))
				hasStock = true;

		if(hasStock) // user already holds this stock
			session.setAttribute("forwardTo", "mainForm.jsp"); // send to main scrn
		else
		{			// add stock to user holdings
			synchronized (db)
			{
				stockDesc = db.getStockDesc(stockSymbol);
			}

			if(stockDesc == null) // stock not in DB
			{
				session.setAttribute("stockSymbol", stockSymbol.toUpperCase());
				session.setAttribute("forwardTo", "stockDesc.jsp"); // get description
			}
			else
			{
				addToUserStocks(userID,stockSymbol);
				session.setAttribute("stocks", getStockList(userID));
				session.setAttribute("forwardTo", "mainForm.jsp"); // to main scrn
			}
		}
	}

	private void addStockDesc(HttpServletRequest req, HttpSession session)
		throws ClassNotFoundException, IOException, SQLException
	{
		String userID = (String)session.getAttribute("userID");
		String stockSymbol = (String)session.getAttribute("stockSymbol");
		String stockDesc = req.getParameter("stockDesc");


		synchronized (db)
		{
			db.addStock(stockSymbol,stockDesc);
			addToUserStocks(userID,stockSymbol);
		}
		session.setAttribute("stocks", getStockList(userID));
		session.setAttribute("forwardTo", "mainForm.jsp");
	}

	private void addToUserStocks(String userID, String stockSymbol)
					throws SQLException, IOException, ClassNotFoundException
	{
		stockSymbol.trim(); // remove any leading, trailing whitespace
		synchronized (db)
		{
			db.addUserStocks(userID,stockSymbol.toUpperCase());
		}
	}

	private void delStock(HttpServletRequest req, HttpSession session)
				throws ClassNotFoundException, IOException, SQLException
	{
		String userID = (String)session.getAttribute("userID");
		String stockSymbol = req.getParameter("stockSymbol");
		synchronized (db)
		{
			db.delUserStocks(userID, stockSymbol);
		}
		session.setAttribute("stocks", getStockList(userID));
		session.setAttribute("forwardTo", "mainForm.jsp");
	}

	private void chgPswd(HttpServletRequest req, HttpSession session)
		throws ClassNotFoundException, IOException, SQLException,
				PasswordException
	{
		String pswd1 = req.getParameter("pswd1");
		String pswd = (String)session.getAttribute("pswd");
		String userID = (String)session.getAttribute("userID");
		User user = null;

		if(session.getAttribute("pswdExpired") != null)
			session.removeAttribute("pswdExpired");

		synchronized (db)
		{
			user = db.getUser(userID); // get user object from DB for this ID
			user.changePassword(pswd, pswd1);  // change password
			db.updUser(user);  // update database
		}

		session.setAttribute("forwardTo", "mainForm.jsp");

		if(user.pswdIsExpiring())
			session.setAttribute("uses", new Integer(user.getPswdUses()));

		if(user.isAdmin())
			session.setAttribute("admin", new Boolean(true));

		session.setAttribute("stocks",getStockList(userID));
	}

	private void addUser(HttpServletRequest req)
		throws ClassNotFoundException, IOException, SQLException,
				PasswordException
	{
		String userID = req.getParameter("userID");
		String userFirstName = req.getParameter("userFirstName");
		String userLastName = req.getParameter("userLastName");
		String newPassword = req.getParameter("pswd1");
		String autoExpires = req.getParameter("autoExpires");
		String numUses = req.getParameter("uses");
		String adminChecked = req.getParameter("isAdmin");

		boolean isAdmin, autoExp;
		int uses = 0;

		if(adminChecked != null && adminChecked.equals("Yes"))
			isAdmin = true;
		else
			isAdmin = false;

		if(autoExpires.equals("Yes"))
			autoExp = true;
		else
			autoExp = false;

		if(autoExp && numUses != null)
			uses = Integer.parseInt(numUses);

		User user = new User(userID, userFirstName, userLastName,
							 newPassword, autoExp, uses, isAdmin);
		user.expirePassword(); // cause new user to have to change password

		synchronized (db)
		{
			db.addUser(user);
		}
	}

	private void delUser(String userID) throws ClassNotFoundException,
											IOException, SQLException
	{
		if(userID != null)
		{
			synchronized (db)
			{
				User user = db.getUser(userID); // throws exeption if user not found
				db.delUser(user);
			}
		}
	}

	private void updUser(HttpServletRequest req)
		throws ClassNotFoundException, IOException, SQLException,
				PasswordException
	{
		// cannot change userID or uses left for password
		String userID = req.getParameter("userID");
		String userFirstName = req.getParameter("userFirstName");
		String userLastName = req.getParameter("userLastName");
		String newPassword = req.getParameter("pswd1");
		String autoExpires = req.getParameter("autoExpires");
		String isAdmin = req.getParameter("isAdmin");

		synchronized (db)
		{
			User user = db.getUser(userID);
			if(newPassword.length() > 0)
				user.adminChangePassword(newPassword);
			user.setFirstName(userFirstName);
			user.setLastName(userLastName);

			if(isAdmin != null && isAdmin.equals("Yes"))
				user.setAdmin(true);
			else
				user.setAdmin(false);

			if(autoExpires.equals("Yes"))
				user.setAutoExpires(true);
			else
				user.setAutoExpires(false);

			db.updUser(user);
		}
	}

	private boolean validUserPswd(User user, String password)
				throws ClassNotFoundException, IOException,
						SQLException, PasswordException
	{
		boolean valid = false;

		if(user != null)
		{
			user.validate(password); // throws PasswordException
			if(user.pswdAutoExpires()) // if tracking uses
				synchronized (db)
				{
					db.updUser(user); // update use count in database
				}
			valid = true;
		}

		return valid;
	}

	private ArrayList getStockList(String userID)
				throws ClassNotFoundException, IOException, SQLException
	{
		ArrayList al = null;
		synchronized (db)
		{
			al = db.listUserStocks(userID);
		}
		return al;
	}

	private void listUsers(HttpSession session)
		throws ClassNotFoundException, IOException, SQLException
	{
		ArrayList rs;

		synchronized (db)
		{
			rs = db.listUsers();
		}
		session.setAttribute("userList", rs);
	}

	private User getUser(String userID)
		throws ClassNotFoundException, IOException,
				SQLException
	{
		User user = null;
		synchronized (db)
		{
			user = db.getUser(userID); // get user object from DB for this ID
		}
		return user;
	}

	private ArrayList getUserData(String userID)
		throws ClassNotFoundException, IOException, SQLException
	{
		ArrayList userData = new ArrayList();
		User user = null;

		synchronized (db)
		{
			user = db.getUser(userID); // get user object from DB for this ID
		}

		if(user != null)
		{
			userData.add(userID);
			userData.add(user.getFirstName());
			userData.add(user.getLastName());
			if(user.isAdmin())
				userData.add("Administrator");
			else
				userData.add("Nonadministrator");

			if(user.pswdAutoExpires())
				userData.add("Yes");
			else
				userData.add("No");

			userData.add(String.valueOf(user.getPswdUses()));
		}

		return userData;
	}
}
1
Contributor
1
Reply
2
Views
8 Years
Discussion Span
Last Post by suretd
0

HI All,

I have managed to find my problem:
In adding my Environment Variable, i ommitted ".;" before my CLASSPATH of C:\Program Files ....

I am now able to compile Servlets ... :)

Solving this thread.

This question has already been answered. Start a new discussion instead.
Have something to contribute to this discussion? Please be thoughtful, detailed and courteous, and be sure to adhere to our posting rules.