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これまでと同様の質問をしましたが、これはやや異なる問題です。私はJava Servletsを使ってWebアプリケーションを実装しています。ログインと登録の機能に問題があります。以前の質問では、データベース接続に問題がありました。私はそれ以来この問題を解決しており、ログインや新規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。ここでログインサーブレットのコードは次のとおりです。Javaサーブレットのログインと登録
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>
}
そしてここでは、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>
}
私はにログインしようとすると表示されているエラーメッセージはありません接続に
エラー：java.sql.SQLExceptionの：ORA-00917：欠落しているコンマ
新しいユーザーがSである私は、新しいユーザーを登録しようとすると、システムが、私は、このエラーメッセージが表示されます。登録されてデータベースに追加されますが、あなたはそうであるように次のページにリダイレクトされません。私はこのエラーを解決する方法を見つけることを試み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でした。私はこれが再投稿とみなされている場合はお詫び申し上げますが、これは以前とはまったく異なる問題だと誓っています。
'ServletException'やJava EE/Servletパッケージの例外ではなく、' SQLException'があります。 JavaのEE /サーブレットの問題としてSQLの問題を投稿しないでください。これは完全に無関係です。 'main（）'メソッドを使ってプレーンなバニラJavaアプリケーションで壊れたSQLを実行すると、まったく同じ問題が発生します。問題を特定する方法を学びます。これにより、すぐにあなたの質問が少なくなり、読みやすくなります。 – BalusC