Question

我在java中创建我的第一个应用程序，所以基本上我想添加一个忘记密码功能。

现在我正在做的是我正在创建一个表单，并且在 POST 方法我从下拉发送三个角色，即Admin，Student，Teacher，

现在基于这些角色，我将在电子邮件中发送密码（我将来会更安全）所以首先我要检查我的角色，其次是在前端输入的电子邮件是否真的存在于数据库中，这是我的代码

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;

import com.suzieloveschildren.emailContactUs.EmailUtility;
import com.suzieloveschildren.entitiesClasses.Intervenants;
import com.suzieloveschildren.entitiesClasses.Mediateurs;
import com.suzieloveschildren.implementationController.EnfantsHibernateDAO;
import com.suzieloveschildren.implementationController.IntervenantsHibernateDAO;
import com.suzieloveschildren.implementationController.MediateursHibernateDAO;
import com.suzieloveschildren.initGeneric.GenericSpringServlet;

/**
 * Servlet implementation class ForgotPassword
 */
@WebServlet("/ForgotPassword")
public class ForgotPassword extends GenericSpringServlet {
    private static final long serialVersionUID = 1L;

    @Autowired
    EnfantsHibernateDAO enfantsdao;

    @Autowired
    MediateursHibernateDAO mediateursdao;

    @Autowired
    IntervenantsHibernateDAO intervenantsdao;

    private String host;
    private String port;
    private String user;
    private String pass;



    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.getRequestDispatcher("/WEB-INF/views/main/forgot.jsp").forward(request, response);

    }


    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        /* Mediateurs mediateurs = new Mediateurs(); */

        String url = "jdbc:mysql://localhost:3307/suzieloveschildren";
        String username = "root";
        String password = "";
        String driverName = "com.mysql.jdbc.Driver";


        String email = request.getParameter("checkmail");
        String role = request.getParameter("checkrole");

    /*  if (role.equals("ROLE_ADMIN")) {

        }*/

        if (role.equals("ROLE_MED")) {

            List<Mediateurs> listofemails = mediateursdao.readAllMediateursEmails();
            String emails = listofemails.toString();
            emails = emails.replace("[", "");
            emails = emails.replace("]", "");

            boolean check = false;
            List<String> emailsforsend = Arrays.asList(emails.split(","));
            for (String em : emailsforsend) {
                // System.out.println(em);
                em = em.trim();
                if (Objects.equals(em, email)) {
                    check = true;
                }
            }

            if (!check) {
                response.sendRedirect("ForgotPassword");
            } else {

                try {
                    System.out.println(email);
                    Class.forName(driverName);
                    Connection connection = DriverManager.getConnection(url, username, password);
                    String sql ="SELECT PASSWORD FROM mediateurs WHERE EMAIL= "+ email;
                    System.out.println(sql);
                    PreparedStatement stmt = connection.prepareStatement(sql);
                    System.out.println(stmt);
                    ResultSet rs = stmt.executeQuery();

                    System.out.println("uneeb");

                    if (rs.next()) {

                        System.out.println(rs.getString(1));
                        System.out.println(rs.getString(2));
                        System.out.println(rs.getString("PASSWORD"));

                    }
                    /*String password2 = "TestPassword";

                    String resultMessage = "";
                    try {
                        String subject = "Email Password Sent";
                        String content = "Your password is:sefssfasasdaas  " ;
                        EmailUtility.sendEmail(host, port, user, pass, email, subject, content);
                        resultMessage = "The e-mail was sent successfully";
                    } catch (Exception ex) {
                        ex.printStackTrace();
                        resultMessage = "There were an error: " + ex.getMessage();
                        request.setAttribute("Message", resultMessage);
                    }*/

                     connection.close();
                } catch (Exception ex) {

                }

            }

        }
    }
}

现在if (role.equals("ROLE_MED"))部分是我被卡住的地方，在的其他条件下如果是我必须从数据库中获取密码的地方电子邮件（我的电子邮件也很独特）现在这是查询

SELECT PASSWORD FROM mediateurs WHERE EMAIL="example@yahoo.com"

现在这个查询在 phpmyadmin 上运行得非常好，但是当我尝试使用预处理语句执行它时，就像没有任何事情一样，在行之后

ResultSet rs = stmt.executeQuery();

在它下面没有任何执行，甚至没有System.out.println("uneeb"); 我不知道我做错了什么，我是java的绝对初学者我已经测试了许多其他问题的解决方案，但没有一个对我有用！有什么帮助吗？

执行后java结果集暂停程序

0 个答案: