我必须如何修复它们？ 请注意，代码仍然完整，我已输入一些打印语句进行检查。 我在数据库中的表 数据库：sharefile 平板电脑：会员
id，mem_first_name，mem_last_name，mem_email，mem_password，mem_birthday
singup.jsp
<%@page import="java.text.SimpleDateFormat"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@page import="jsp.*,java.util.*,java.sql.*"%>
<%!
public static String validateEmail(String email){
String error = "";
if(email.isEmpty()){
error ="This field is required.";
}else if(email.length() > 32)
{
error ="This field cannot exceed the length of 32.";
}else if(email.matches("\\w+(\\.\\w+)*@\\w+\\.\\w(2,4)")){
error = "Invalid email.";
}
return error;
}
public static String validatePassword(String password){
String error = "";
if(password.isEmpty()){
error ="This field is required.";
}else if(password.length() > 24){
error ="This field cannot exceed the length of 24.";
}
return error;
}
public static String validateBirthday(String birthday){
String error = "";
if(birthday.isEmpty()){
error ="This field is required.";
}else if(!birthday.matches("\\d{2}\\/\\d{2}/\\d{4}")) {
error = "Invalid date format. MM/dd/yyyy";
}else{
try{
java.util.Date d = new SimpleDateFormat("MM/dd/yyyy").parse(birthday);
if(d.after(new java.util.Date())){
error = "Invalid date.";
}
}
catch(Exception e){
error = "Invalid date.";
}
}
return error;
}
public static long insertUser(Connection c, String fname, String lname, String email, String password, String birthday){
long id = -1;
try{
PreparedStatement ps = c.prepareStatement("INSERT INTO members (mem_first_name,mem_last_name,mem_email,mem_password,mem_birthday) VALUES(?,?,?,?,?)",Statement.RETURN_GENERATED_KEYS);
ps.setString(1,fname);
ps.setString(2,lname);
ps.setString(3,email);
ps.setString(4,password);
java.sql.Date d = new java.sql.Date(new SimpleDateFormat("MM/dd/yyyy").parse(birthday).getTime());
ps.setDate(5,d);
ps.execute();
ResultSet rs = ps.getGeneratedKeys();
if(rs.next()){
id = rs.getLong(1);
}
rs.close();
ps.close();
}catch(Exception e){
}
return id;
}
%>
<%
String email = request.getParameter("email");
String fname = request.getParameter("first_name");
String lname = request.getParameter("last_name");
String password = request.getParameter("password");
String birthday = request.getParameter("birthday");
String email_error = "",password_error = "",birthday_error = "";
if(email==null)
{
email = "";
password = "";
birthday = "";
fname = "";
lname = "";
}else{
email_error = validateEmail(email);
password_error = validatePassword(password);
birthday_error = validateBirthday(birthday);
if(email_error.isEmpty() && password_error.isEmpty() || birthday_error.isEmpty())
{
Connection c = MySQL.connect();
if(c!=null){
long id = insertUser(c,email,password,fname,lname,birthday);
if(id!=1){
session.setAttribute(Template.USER_ID, id);
}else{
email_error = "That email is already in use.";
}
}
}
}
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery-ui.js"></script>
<script type="text/javascript" src="js/bootstrap.min.js"></script>
<link type="text/css" rel="stylesheet" href="css/jquery-ui.css">
<link type="text/css" rel="stylesheet" href="css/bootstrap.min.css">
<link type="text/css" rel="stylesheet" href="css/bootstrap-theme.min.css">
<link type="text/css" rel="stylesheet" href="css/style.css">
<script type="text/javascript">
$(function() {
$("#birthday").datepicker();
});
</script>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<div class="container">
<div class="row centered-form">
<div class="col-xs-12 col-sm-8 col-md-4 col-sm-offset-2 col-md-offset-4">
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title">Please sign up <small>It's free!</small></h3>
</div>
<div class="panel-body">
<form role="form">
<div class="row">
<div class="col-xs-6 col-sm-6 col-md-6">
<div class="form-group">
<input type="text" name="first_name" id="first_name" class="form-control input-sm" placeholder="First Name">
</div>
</div>
<div class="col-xs-6 col-sm-6 col-md-6">
<div class="form-group">
<input type="text" name="last_name" id="last_name" class="form-control input-sm" placeholder="Last Name">
</div>
</div>
</div>
<div class="form-group">
<input type="email" name="email" id="email" class="form-control input-sm" placeholder="Email Address" value="<%=email%>"><%=email_error %>
</div>
<div class="row">
<div class="col-xs-6 col-sm-6 col-md-6">
<div class="form-group">
<input type="password" name="password" id="password" class="form-control input-sm" placeholder="Password"><%=password_error %>
</div>
</div>
</div>
<div class="form-group">
<input type="text" name="birthday" id="birthday" class="form-control input-sm" placeholder="Birthday" value="<%=birthday%>"><%=birthday_error %>
</div>
<input type="submit" value="Register" class="btn btn-info btn-block">
</form>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
MySQL.java
package jsp;
import java.sql.*;
public class MySQL {
public static Connection connect() {
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
return DriverManager.getConnection("jdbc:mysql://localhost/sharefile","root","123456");
}catch(Exception e){
return null;
}
}
public static boolean close(Connection c){
try{
c.close();
return true;
}catch(Exception e){
return false;
}
}
}
Template.java
package jsp;
public class Template {
public static final String USER_ID = "id";
}
答案 0 :(得分：0)
我已经编写了15年的Java代码，这可能是我看到有人试图实现这一目标的最糟糕的方式。这种方法是一个悲惨的想法，今天仍然是一个 - 可能更多。
停止。现在
花点时间了解在Java中使用数据库的选项（mybatis，hibernate，JPA，jsp中的直接jdbc除外）。
了解更多信息并了解Java中的Web开发及其周围的选项（struts，jsf，stripe，除了在jsp文件中转储的一堆蹩脚代码）。
之后，回来再问一遍。
答案 1 :(得分：0)
的Class.forName（＆＃34; com.mysql.jdbc.Driver＆＃34）。的newInstance（）;
在上面的代码中......不需要创建新实例。 我们所做的基本上是将驱动程序类加载到内存中而不是创建新实例。
所以请使用
的Class.forName（＆＃34; com.mysql.jdbc.Driver＆＃34）;