public class DBUserDataConnector extends HttpServlet {
/* Die Methode Connection stellt eine Verbindung zur MySQL Datenbank her */
public static Connection connect(){
Connection conn = null;
try{
//MySQL Treiber laden
Class.forName("com.mysql.jdbc.Driver");
//Verbindung herstellen
conn = DriverManager.getConnection("jdbc:mysql:///userdata", "root", "");
}catch(Exception e){
System.out.println("Fehler bei Datenbankverbindung: " + e.toString());
}
return conn;
}
/* Die Methode doPass überprüft das eingegebene Passwort */
public void doPass(){
//Verbindung herstellen
Connection conn = connect();
//Variablen aus dem Formular auslesen
String username = request.getParameter("name");
String password = request.getParameter("passwort");
if (username == null) {
//Statement Objekt erzeugen
try{
//Statement Objekt erzeugen
Statement stmt = conn.createStatement();
//Abfrage ausführen
ResultSet rs = stmt.executeQuery("select name, passwort from userdata");
}catch(SQLException e){
//Fehlermeldung ausgeben
PrintWriter out = response.getWriter();
//Fehlerseite ausgeben
out.println("<html>");
out.println("<head>");
out.println("<title>Database Request Error</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>SQL Connection Error</h1>");
out.println("<p>Error by accessing database </p>" + e.toString());
out.println("</body>");
out.println("</html>");
}
//Abfrage auf Datenbank ausführen
}
}
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
/* TODO output your page here
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet DBUserDataConnector</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet DBUserDataConnector at " + request.getContextPath () + "</h1>");
out.println("<p>This Servlet processes the User input of the Administration form</p>");
out.println("</body>");
out.println("</html>");
*/
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "UserData Table Connector Servlet";
}// </editor-fold>
}