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我已创建登录网页登录网站。 每当我尝试登录它时，它都不会回应任何内容，但是如果我点击了signin按钮，那么它首先会给我一个电子邮件或密码不正确的消息（我已将此代码插入到我的servlet中）为字段是空的，但在这个过程后，如果我再次输入凭据，它允许我登录。无法以登录形式登录
我的意思是首先，我必须点击signin按钮比servlet会给电子邮件或密码不正确，比输入凭据后，它将允许我登录。登录
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>iCliniX</title>
<%@ include file="controls/css.jsp" %>
<%@ include file="controls/js.jsp" %>
</head>
<body>
<div class="account-container login">
\t
\t <div class="content clearfix">
\t \t
\t \t <form action="../AdminLoginServlet" method="post">
\t \t
\t \t \t <h1>Sign In</h1> \t \t
\t \t \t
\t \t \t <div class="login-fields">
\t \t \t \t
\t \t \t \t <p>Sign in using your registered account:</p>
\t \t \t \t
\t \t \t \t <div class="field">
\t \t \t \t \t <label for="username">Username:</label>
\t \t \t \t \t <input type="text" id="username" name="username" value="" placeholder="Username" class="login username-field" />
\t \t \t \t </div> <!-- /field -->
\t \t \t \t
\t \t \t \t <div class="field">
\t \t \t \t \t <label for="password">Password:</label>
\t \t \t \t \t <input type="password" id="password" name="password" value="" placeholder="Password" class="login password-field"/>
\t \t \t \t </div> <!-- /password -->
\t \t \t \t
\t \t \t </div> <!-- /login-fields -->
\t \t \t
\t \t \t <div class="login-actions">
\t \t \t \t
\t \t \t \t <span class="login-checkbox">
\t \t \t \t \t <%
\t \t \t \t \t \t String value = (String)request.getSession().getAttribute("registration");
\t \t \t \t \t \t if(value!=null){
\t \t \t \t \t \t \t out.print(value);
\t \t \t \t \t \t }
\t \t \t \t \t %>
\t \t \t \t </span>
\t \t \t \t \t \t \t \t \t
\t \t \t \t <input type="submit" class="button btn btn-secondary btn-large" value="Sign In" />
\t \t \t \t
\t \t \t </div> <!-- .actions -->
\t \t \t
\t \t \t
\t \t </form>
\t \t
\t </div> <!-- /content -->
\t
</div> <!-- /account-container -->
<!-- Text Under Box -->
<div class="login-extra">
\t <a href="forgotpassword.jsp">Forgot Password</a>
</div> <!-- /login-extra -->
</body>
</html>的servelt脚本JSP文件的
JSP代码。 AdminLoginServelt.java
package com.iclinix.controller;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
@WebServlet("/AdminLoginServlet")
public class AdminLoginServlet extends HttpServlet {
\t private static final long serialVersionUID = 1L;
\t protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
\t \t
\t }
\t
\t protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
\t \t String email = request.getParameter("username");
\t \t String pass = request.getParameter("password");
\t \t HttpSession s = request.getSession();
\t \t try {
\t \t \t Class.forName("com.mysql.jdbc.Driver");
\t \t \t Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/iclinix","root","root");
\t \t \t Statement st = con.createStatement();
\t \t \t String mail = null, password = null;
\t \t \t ResultSet rs = st.executeQuery("select * from tbl_admin_details where email='"+email+"'");
\t \t \t while(rs.next()){
\t \t \t \t mail = rs.getString("email");
\t \t \t \t password = rs.getString("password");
\t \t \t }
\t \t \t if(mail!=null && password!=null &&email.equals(mail)&&pass.equals(password)){
\t \t \t \t response.sendRedirect("cpaneliclinix/index.jsp");
\t \t \t }
\t \t \t else{
\t \t \t \t s.setAttribute("registration", "Email Or Password are Wrong!!!");
\t \t \t \t response.sendRedirect("cpaneliclinix/login.jsp");
\t \t \t }
\t \t } catch (Exception e) {
\t \t }
\t }
}我希望你有我的问题。