我过去曾问过类似的问题，但这是一个稍微不同的问题。我正在使用Java Servlets实现Web应用程序。我遇到登录和注册功能问题。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时让应用程序重定向到正确的页面时遇到了问题。以下是Login 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>
}
以下是注册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此错误消息：
连接错误：java.sql.SQLException：ORA-00917：缺少逗号
新用户仍然已注册并添加到数据库中，但您不会像您应该那样重定向到下一页。我已经找了一段时间试图找到解决这个错误的方法但到目前为止没有成功。如果这被认为是转贴，我很抱歉，但我发誓这与以前完全不同。
答案 0 :(得分：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";
请注意，没有右括号。鉴于您提供的文字墙，很难看到这一点。请注意，此错误出现两次，并且正好在您期望的位置：在构造sql语句以插入新用户之后，但在方法结束之前 - 特别是在后续的sql语句中。考虑一下您收到的错误（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。