hi, I have 2 java classes in the same directory. One of them
(SlateServlet.java) creates a new object from the other class (UsersDB.java).
When I compile UsersDB, everything is correct and the .class archive is in the
same path as the other .java archives. But when I want to compile the
SlateServlet.java archive it gives me 3 errors telling that it doesn't knows
the class UsersDB when it tries to create an object UserDB.What am I doing
wrong? I've put the codes for this two java classes. Thankyou
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import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.Date;
/**
* @author Jordi Forga
*/
public class SlateServlet extends HttpServlet
{
public void init()
{
ServletContext context = getServletContext();
context.setAttribute("slate_text","");
context.setAttribute("slate_user",null);
context.setAttribute("slate_date",new Date());
context.setAttribute("users_db",new UsersDB());
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
process(request,response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
process(request,response);
}
protected void process(HttpServletRequest request, HttpServletResponse
response)
throws IOException, ServletException
{
HttpSession oldSession = request.getSession(false);
String sessionUser = null;
if (oldSession != null) {
sessionUser = (String) oldSession.getAttribute("user");
}
String serv_path = request.getServletPath();
if (serv_path.equals("/view.do")) {
view(response,sessionUser,null);
} else if (serv_path.equals("/login.do")) {
String name = request.getParameter("name");
String passwd = request.getParameter("passwd");
ServletContext context = getServletContext();
UsersDB udb = (UsersDB)context.getAttribute("users_db");
if (udb.checkUser(name,passwd)) {
request.getSession(true).setAttribute("user",name);
view(response,name,null);
} else {
view(response,sessionUser,"Error de autentificación");
}
} else if (serv_path.equals("/logout.do")) {
request.getSession(true).invalidate();
view(response,null,null);
} else if (serv_path.equals("/modify.do")) {
String message = request.getParameter("message");
if (sessionUser != null) {
ServletContext context = getServletContext();
context.setAttribute("slate_text",message);
context.setAttribute("slate_user",sessionUser);
context.setAttribute("slate_date",new Date());
view(response,sessionUser,null);
} else {
view(response,null,"Error: Debe autentificarse previamente");
}
} else {
response.setContentType("text/plain");
PrintWriter wr = response.getWriter();
wr.println("Invalid path: "+serv_path);
}
}
protected void view(HttpServletResponse response, String sessionUser,
String errMsg)
throws IOException
{
ServletContext context = getServletContext();
String slateUser = (String) context.getAttribute("slate_user");
String text = (String) context.getAttribute("slate_text");
Date date = (Date) context.getAttribute("slate_date");
String dateStr = date.toString();
response.setContentType("text/html");
PrintWriter wr = response.getWriter();
wr.println("<HTML>");
wr.println("<HEAD>");
wr.println(" <META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html;
charset="+response.getCharacterEncoding()+"\">");
wr.println(" <TITLE>Ejemplo de aplicación con servlets</TITLE>");
wr.println("</HEAD>");
wr.println("<BODY BGCOLOR=\"lightblue\">");
wr.println(" <center><H1>Ejemplo de aplicación con
servlets</H1></center>");
wr.println(" <HR>");
if (errMsg != null) {
wr.println(" <P><FONT
COLOR=\"red\"><B><EM>"+errMsg+"</EM></B></FONT></P>");
wr.println(" <HR>");
}
if (sessionUser == null) {
wr.println(" <FORM METHOD=\"POST\" ACTION=\"login.do\"><CENTER>");
wr.println(" <P>Nombre de usuario:");
wr.println(" <INPUT TYPE=\"text\" NAME=\"name\" SIZE=\"10\"></P>");
wr.println(" <P>Clave de acceso:");
wr.println(" <INPUT TYPE=\"password\" NAME=\"passwd\"
SIZE=\"10\"></P>");
wr.println(" <INPUT TYPE=\"submit\" NAME=\"login\"
VALUE=\"Login\">");
wr.println(" </CENTER></FORM>");
wr.println(" <HR>");
if (slateUser == null) {
wr.println(" <H3>Pizarra vacía</H3>");
} else {
wr.println(" <H3>Pizarra modificada el d\u00eda <B>"+dateStr+
"</B> por <B>"+slateUser+"</B>:</H3>");
wr.println(" <DIV><PRE>");
wr.println(text);
wr.println(" </PRE></DIV>");
}
} else {
wr.println(" <FORM METHOD=\"POST\" ACTION=\"logout.do\"><CENTER>");
wr.println(" <P><B>Usuario "+sessionUser+
"</B>: <INPUT TYPE=\"submit\" NAME=\"logout\"
VALUE=\"Logout\"></P>");
wr.println(" </CENTER></FORM>");
wr.println(" <HR>");
if (slateUser == null) {
wr.println(" <H3>Pizarra vacía</H3>");
} else {
wr.println(" <H3>Pizarra modificada el d\u00eda <B>"+dateStr+
"</B> por <B>"+slateUser+"</B>:</H3>");
}
wr.println(" <FORM METHOD=\"POST\" ACTION=\"modify.do\"><CENTER>");
wr.println(" <TEXTAREA NAME=\"message\" ROWS=\"10\"
COLS=\"60\">"+text+
"</TEXTAREA><BR>");
wr.println(" <INPUT TYPE=\"reset\" VALUE=\"Restaura\">");
wr.println(" <INPUT TYPE=\"submit\" NAME=\"send\"
VALUE=\"Canvia\">");
wr.println(" </CENTER></FORM>");
}
wr.println(" <HR>");
wr.println(" <P><A HREF=\"index.html\">Descripci\u00f3n de la
aplicaci\u00f3n</A></P>");
wr.println("</BODY>");
wr.println("</HTML>");
}
}
import java.util.Hashtable;
/**
* @author Jordi Forga
*/
public class UsersDB
{
public boolean checkUser(String name, String password)
{
return name.length() >= 5 && name.equals(password);
}
}---------------------------------------------------------------------
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