点击登录后，报404错误，请老师看一下
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>图书后台管理登录界面</title>
</head>
<body>
<center>
<h1>登录 | <a href="<%=basePath%>regist.jsp">注册</a></h1>
<form action="<%=basePath%>/LoginServlet" method="post">
<table width="350px" cellspacing="0px" cellpadding="0px" border="1px">
<tr>
<td>用户名</td>
<td><input type="text" name="username" placeholder="用户名为3-12位字母数字或下划线组合" ></td>
</tr>
<tr>
<td>密 码</td>
<td><input type="password" name="password" placeholder="长度为6-12位的纯数字" ></td>
</tr>
<tr>
<td colspan="2" style="text-align:center">
<input type="submit" value="登录">
<input type="reset" value="取消">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>注册界面</title>
</head>
<script type="text/javascript" src="js/jquery-3.4.1.js"></script>
<script>
function checkUserName(){
var usernameRegEx=/^[a-zA-Z0-9_]{3,12}$/;
var username=document.getElementById("username").value;
if(!usernameRegEx.test(username)){
alert("用户名格式不正确!");
}else{
return;
}
}
function checkPassword(){
var passwordRegEx=/^[0-9]{6,12}$/;
var password=document.getElementById("password").value;
if(!passwordRegEx.test(password)){
alert("密码格式不正确!");
document.getElementById("password").value="";
}else{
return;
}
}
function checkckPWD(){
var checkpwdRegEx=/^\d{6,12}$/;
var checkpassword=document.getElementById("checkPWD").value;
if(!checkpwdRegEx.test(checkpassword)){
alert("密码输入不一致!");
document.getElementById("checkPWD").value="";
}else{
return;
}
}
function checkPhone(){
var phoneRegEx=/^(13[0-9]|14[56789]|15[0-9]|16[6]|17[0-9]|18[0-9]|19[89])[0-9]{8}$/;
var phone=document.getElementById("phone").value;
if(!phoneRegEx.test(phone)){
alert("手机号码格式不正确!");
}else{
return;
}
}
function checkEmail(){
var emailRegEx=/^[a-zA-Z_0-9]{3,}@([a-zA-Z]+|\d+)(\.[a-zA-Z]+)+$/; //因为是写在function里面的，所以不需要写\\.只需要写成\.即可
var email=document.getElementById("email").value;
if(!emailRegEx.test(email)){
alert("邮箱格式不正确!");
}else{
return;
}
}
</script>
<body>
<center>
<h1>用户注册</h1>
<form action="<%=basePath%>RegistServlet" method="post">
<table width="400px" cellspacing="0px" cellpadding="0px" border="1px">
<tr>
<td>用户名</td>
<td><input type="text" id="username" name="username" pattern="[a-zA-Z0-9_]{3,12}" required="required" placeholder="用户名为3-12位字母数字或下划线组合" onblur="checkUserName()"></td>
</tr>
<tr>
<td>密 码</td>
<td><input type="password" id="password" name="password" pattern="[0-9]{6,12}" required="required" placeholder="密码长度为6-12位的纯数字" id="password" onblur="checkPassword()"></td>
</tr>
<tr>
<td>确认密码</td>
<td><input type="password" id="checkPWD" name="checkPWD" pattern="[0-9]{6,12}" required="required" placeholder="密码长度为6-12位的纯数字" onblur="checkckPWD()"></td>
</tr>
<tr>
<td>手机号码</td>
<td><input type="text" id="phone" name="phone" pattern="(13[0-9]|14[56789]|15[0-9]|16[6]|17[0-9]|18[0-9]|19[89])[0-9]{8}" required="required" placeholder="请输入正确的手机号码格式" onblur="checkPhone()"></td>
</tr>
<tr>
<td>邮箱</td>
<td><input type="email" id="email" name="email" required="required" placeholder="请输入正确邮箱格式" onblur="checkEmail()"></td>
</tr>
<tr>
<td colspan="2" style="text-align:center">
<input type="submit" value="注册">
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*,com.vincent.system.*" %>
<%
String username=request.getParameter("username");
String password=request.getParameter("password");
//从ServletContext作用域中获得保存用户信息的集合
List<User> list =(List<User>)this.getServletContext().getAttribute("list");
//遍历集合
for(User u :list){
if(username.equals(u.getUsername())){
if(password.equals(u.getPassword())){
request.getSession().setAttribute("loginUser", u);
response.sendRedirect(request.getContextPath()+"/server.jsp");
return;
}
}
}
//登录失败
request.setAttribute("msg", "用户名密码不正确!");
request.getRequestDispatcher("/index.jsp").forward(request, response);
%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>图书后台管理系统</title>
</head>
<frameset rows="20%,*">
<frame src="./top.jsp"></frame>
<frameset cols="10%,*">
<frame src="./left.jsp"></frame>
<frame name="main"></frame>
</frameset>
</frameset>
</html>
正在回答
同学你好。请你检查一下LoginServlet的web.xml配置是否正确，如果还有问题，可以贴一下web.xml和LoginServlet的代码。
注意不要贴在回复里，会失去代码的格式。可以用回答这个问题的方式，将代码贴入。
祝学习愉快~
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