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我过去曾问过一个与此类似的问题，但这是一个略有不同的问题。我正在使用 Java Servlet 实现一个 Web 应用程序。我的登录和注册功能有问题。在我之前的问题中，我遇到了数据库连接问题。我已经解决了这个问题，现在在成功登录或注册新用户后让应用程序重定向到正确的页面时遇到问题。下面是登录 servlet 的代码：

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>
}

这是注册 Servlet 的代码：

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>
}

当我尝试登录系统时没有显示错误消息，但是当我尝试注册新用户时收到以下错误消息：

连接错误：java.sql.SQLException：ORA-00917：缺少逗号

新用户仍会注册并添加到数据库中，但您不会像预期的那样被重定向到下一页。我已经寻找了一段时间试图找到解决此错误的方法，但到目前为止成功率为零。如果这被认为是转发，我深表歉意，但我发誓这是一个与以前完全不同的问题。

4

1 回答 1

0

这是你的问题：

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

注意没有右括号。鉴于您提供的文字墙，这很难看到。请注意，此错误出现两次，并且正是您所期望的：在您构造 sql 语句以插入新用户之后，但在方法结束之前 - 特别是在随后的 sql 语句中。考虑您收到的错误（SQL 错误），您应该能够在不显示所有无关代码的情况下缩小范围。

于 2012-04-11T00:52:53.310 回答