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過去にも似たような質問をしたことがありますが、これは少し違う問題です。Java サーブレットを使用して Web アプリケーションを実装しています。ログインおよび登録機能に問題があります。以前の質問で、データベース接続に問題がありました。それ以来、私はその問題を解決しましたが、ログインまたは新しいユーザーの登録が成功したときに、アプリケーションを正しいページにリダイレクトするのに問題が発生しています。Login サーブレットのコードは次のとおりです。

package hw5package;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Tyler
 */
public class Login extends HttpServlet {

/**
 * 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 {
        String driver = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@cci-ora02.uncc.edu:1521:class";
        String username = "teverha4";
        String password = "qwe123";

        out.println("<html>");
        out.println("<head>");
        out.println("<title>ITIS 4166 Project</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<div align='center'>");
        out.println("<h1>ITIS 4166 Project - Login Page</h1>");
        out.println("<h2>by: Tyler Everhart</h2>");

        out.println("<br />");
        out.println("<br />");
        out.println("<br />");
        out.println("<br />");

        out.println("<table width='20%' border='1' cellspacing='1' cellpadding='1'>");
        out.println("<form id='loginForm' name='loginForm' method='POST'>");
        out.println("<tr>");
        out.println("<td bgcolor='006F13' align='left' colspan='2'><b>Login</b></td>");
        out.println("</tr>");

        out.println("<tr>");
        out.println("<td bgcolor='35D551' align='left'>Username:</td>");
        out.println("<td bgcolor='35D551'>");
        out.println("<input type='text' name='username' id='username' />");
        out.println("</td>");
        out.println("</tr>");
        String passUsername = request.getParameter("username");

        out.println("<tr>");
        out.println("<td bgcolor='35D551' align='left'>Password:</td>");
        out.println("<td bgcolor='35D551'>");
        out.println("<input type='password' name='pwd' id='pwd' />");
        out.println("</td>");
        out.println("</tr>");
        String passPwd = request.getParameter("pwd");

        out.println("<tr>");
        out.println("<td bgcolor='006F13' align='center' colspan='2'>");
        out.println("<input type='submit' value='Submit' onclick='loginValidation()' /> ");
        out.println("<input type='reset' value='Reset' />");
        out.println("</td>");
        out.println("</tr>");
        out.println("</form>");
        out.println("</table>");
        out.println("<a href='Registration'>New User, Click Here to Register</a>");
        out.println("</div>");
        out.println("</body>");
        out.println("</html>");

        Class.forName(driver);

        Connection connection = DriverManager.getConnection(url, username, password);

        Statement statement = connection.createStatement();
        String query = "SELECT UserName, PassWord FROM UserLogin";

        ResultSet resultSet = statement.executeQuery(query);

        HttpSession session = request.getSession(true);

        while (resultSet.next()) {
            if ((passUsername.equals(resultSet.getString("UserName")) && passPwd.equals(resultSet.getString("PassWord")))) {
                String sessionID = UUID.randomUUID().toString();
                session.setAttribute("username", passUsername);
                session.setAttribute("sessionID", sessionID);
                response.sendRedirect("Categories");
            }
            else if (passUsername.equals("") || passPwd.equals("")) {
                out.println("Enter a username and password.");
            }
            else {
                out.println("Either your username or password is incorrect or could not be found.");
                out.println("Please try again, or click the link below to register.");
            }
        }
    }
    catch (ClassNotFoundException cnfe) {
        System.err.println("Error loading driver: " + cnfe);
        out.println("<tr>Error loading driver: " + cnfe + "</tr>");
    }
    catch (SQLException sqle) {
        System.err.println("Error with connection: " + sqle);
        out.println("<tr>Error with connection: " + sqle + "</tr>");
    }
    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 "Short description";
}// </editor-fold>
}

登録サーブレットのコードは次のとおりです。

package hw5package;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.Random;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Tyler
 */
public class Registration extends HttpServlet {

/**
 * 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 {
        String driver = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@cci-ora02.uncc.edu:1521:class";
        String username = "teverha4";
        String password = "qwe123";

        out.println("<html>");
        out.println("<head>");
        out.println("<title>ITIS 4166 Project</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<div align='center'>");
        out.println("<h1>ITIS 4166 Project - Registration Page</h1>");
        out.println("<h2>by: Tyler Everhart</h2>");

        out.println("<br />");
        out.println("<br />");
        out.println("<br />");
        out.println("<br />");

        out.println("<table width='25%' border='1' cellspacing='1' cellpadding='1'>");
        out.println("<tr>");
        out.println("<th bgcolor='006F13' align='left' colspan='2'>Register Account Information</th>");
        out.println("</tr>");

        out.println("<tr>");
        out.println("<td bgcolor='35D551' align='left'>Requested Username:</td>");
        out.println("<td bgcolor='35D551'>");
        out.println("<form id='enterForm' name='enterForm'>");
        out.println("<input type='text' name='requested_username' />");
        out.println("</td>");
        out.println("</tr>");
        String passUsername = request.getParameter("requested_username");

        out.println("<tr>");
        out.println("<td bgcolor='35D551' align='left'>Password:</td>");
        out.println("<td bgcolor='35D551'>");
        out.println("<input type='password' name='pwd' />");
        out.println("</td>");
        out.println("</tr>");
        String passPwd = request.getParameter("pwd");

        out.println("<tr>");
        out.println("<td bgcolor='35D551' align='left'>Confirm Password:</td>");
        out.println("<td bgcolor='35D551'>");
        out.println("<input type='password' name='pwd1' />");
        out.println("</td>");
        out.println("</tr>");
        String passPwd1 = request.getParameter("pwd1");

        out.println("<tr>");
        out.println("<td bgcolor='006F13' align='center' colspan='2'>");
        out.println("<input name='Submit' type='submit' value='Submit' /> ");
        out.println("<input type='reset' value='Reset' />");
        out.println("</td>");
        out.println("</tr>");
        out.println("</form>");
        out.println("</table>");
        out.println("</div>");
        out.println("</body>");
        out.println("</html>");

        Class.forName(driver);

        Connection connection = DriverManager.getConnection(url, username, password);

        Statement statement = connection.createStatement();

        HttpSession session = request.getSession();

        if (passPwd.equals("") || passPwd1.equals("")) {
            Integer registerError = Integer.valueOf(1);
            session.setAttribute("registerError", registerError);
            out.println("Please enter a valid password.");
        }
        else if (!passPwd.equals(passPwd1)) {
            Integer registerError = Integer.valueOf(2);
            session.setAttribute("registerError", registerError);
            out.println("Your password and confirm password does not match.");
        }
        else {
            String query2 = "INSERT INTO UserLogin (UserName, PassWord, StockAmt, TechnologyStock, UtilityStock) VALUES (?,?,?,?,?)";
            PreparedStatement stmt = connection.prepareStatement(query2);
            stmt.setString(1, passUsername);
            stmt.setString(2, passPwd);
            stmt.setInt(3, 0);
            stmt.setInt(4, 0);
            stmt.setInt(5, 0);
            stmt.executeQuery();
            session.setAttribute("sessionUsername", passUsername);
            String sessionID = UUID.randomUUID().toString();

            Random StockID1 = new Random();
            StockID1.nextInt(10);
            String insertDataSqlMicrosoft = "INSERT INTO StockInfo(StockID, UserID, Type, StockName, Owned, Price, Total) VALUES('" + StockID1 + "','" + passUsername + ",'Technology','Microsoft (MSFT)',0,32.75,0";
            PreparedStatement stmtMicrosoft = connection.prepareStatement(insertDataSqlMicrosoft);
            stmtMicrosoft.executeQuery();

            Random StockID2 = new Random();
            StockID2.nextInt(4);
            String insertDataSqlIntel = "INSERT INTO StockInfo(StockID, UserID, Type, StockName, Owned, Price, Total) VALUES('" + StockID2 + "','" + passUsername + "','Technology','Intel (INTC)',0,26.75,0)";
            PreparedStatement stmtIntel = connection.prepareStatement(insertDataSqlIntel);
            stmtIntel.executeQuery();

            Random StockID3 = new Random();
            StockID3.nextInt(9);
            String insertDataSqlDuke = "INSERT INTO StockInfo(StockID, UserID, Type, StockName, Owned, Price, Total) VALUES('" + StockID3 + "','" + passUsername + "','Utility','Duke Energy (DUK)',0,89.00,0";
            PreparedStatement stmtDuke = connection.prepareStatement(insertDataSqlDuke);
            stmtDuke.executeQuery();

            Random StockID4 = new Random();
            StockID4.nextInt(7);
            String insertDataSqlCable = "INSERT INTO StockInfo(StockID, UserID, Type, StockName, Owned, Price, Total) VALUES('" + StockID4 + "','" + passUsername + "','Utility','Time Warner Cable (TWC)',0,30.00,0)";
            PreparedStatement stmtCable = connection.prepareStatement(insertDataSqlCable);
            stmtCable.executeQuery();

            session.setAttribute("sessionID", sessionID);
            response.sendRedirect("Categories");
        }
    } 
    catch (ClassNotFoundException cnfe) {
        System.err.println("Error loading driver: " + cnfe);
        out.println("<tr>Error loading driver: " + cnfe + "</tr>");
    }
    catch (SQLException sqle) {
        System.err.println("Error with connection: " + sqle);
        out.println("<tr>Error with connection: " + sqle + "</tr>");
    } 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 "Short description";
}// </editor-fold>
}

システムにログインしようとすると表示されるエラー メッセージはありませんが、新しいユーザーを登録しようとすると、次のエラー メッセージが表示されます。

接続エラー: java.sql.SQLException: ORA-00917: カンマがありません

新しいユーザーは引き続き登録され、データベースに追加されますが、本来のように次のページにリダイレクトされません。このエラーを解決する方法を見つけるためにしばらく探しましたが、これまでのところ成功していません。これが再投稿と見なされる場合は申し訳ありませんが、これは以前とはまったく異なる問題であることを誓います.

4

1 に答える 1

0

これはあなたの問題です：

String insertDataSqlMicrosoft = "INSERT INTO StockInfo (StockID, UserID, Type, StockName, Owned, Price, Total) VALUES('" + StockID1 + "','" + passUsername + ",'Technology','Microsoft (MSFT)',0,32.75,0";

閉じ括弧がないことに注意してください。あなたが提供したテキストの壁を考えると、これは見にくいです。このエラーは 2 回表示されることに注意してください。これは、SQL ステートメントを作成して新しいユーザーを挿入した後、メソッドの終了前、特に後続の SQL ステートメントで発生します。受け取ったエラー (SQL エラー) を考えてみましょう。無関係なコードをすべて提示することなく、これを絞り込むことができるはずです。

于 2012-04-11T00:52:53.310 に答える