老师，为什么我的userList集合里面没有数据呢
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%
String path=request.getContextPath();
String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path;
%>
<!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>
<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" name="username" placeholder="用户名为3-12位字母数字或下划线组合" pattern="[\w]{3,12}"></td>
</tr>
<tr>
<td>密 码</td>
<td><input type="password" name="password" placeholder="密码长度为6-12位的纯数字" id="password" pattern="[\d]{6,12}"></td>
</tr>
<tr>
<td>确认密码</td>
<td><input type="password" name="checkPWD" placeholder="密码长度为6-12位的纯数字" pattern="[\d]{6,12}"></td>
</tr>
<tr>
<td>手机号码</td>
<td><input type="text" name="phone" placeholder="请输入正确的手机号码格式" pattern="1[3578]\d{9}"></td>
</tr>
<tr>
<td>邮箱</td>
<td><input type="email" name="email" placeholder="请输入正确邮箱格式" required="required"></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>package com.imooc.servlet;
import java.io.IOException;
import java.util.List;
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 com.imooc.model.User;
@WebServlet("/RegistServlet")
public class RegistServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
String checkPWD=request.getParameter("checkPWD");
String phoneNum=request.getParameter("phone");
String email=request.getParameter("email");
String usernameRegex="[\\w]{3,12}";
String passwordRegex="[\\d]{6,12}";
String phoneRegex="1[3578]\\d{9}";
String emailRegex="[\\w] {3,}@([a-aA-Z]+|\\d+)(\\.[a-zA-Z]+)+";
boolean flag1=username.matches(usernameRegex);
boolean flag2=password.matches(passwordRegex);
boolean flag3=checkPWD.matches(passwordRegex);
boolean flag4=phoneNum.matches(phoneNum);
boolean flag5=email.matches(emailRegex);
List<User> userList=(List<User>)this.getServletContext().getAttribute("UserList");
if(flag1&&flag2&&flag3&&flag4&&flag5) {
User user=new User();
user.setUsername(username);
user.setPassword(password);
user.setPhoneNum(phoneNum);
user.setEmail(email);
userList.add(user);
}
System.out.println(userList);
this.getServletContext().setAttribute("UserList", userList);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
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