这是一道大学Web开发技术课程中的课程作业：
实现一个简单的企业会员注册和登录功能。具体要求如下： （1）注册页面register.html包括用户名、密码、姓名、性别、邮箱、手机号等信息，要求对所有字段进行非空判断，密码为数字、字母和特殊字符的组合（不少于8位），对邮箱和手机号进行有效性判断，否则弹出对话框进行提示。注册信息处理由映射地址为register.do的RegisterServlet.java进行处理，将所有用户注册的登录名、密码、姓名、性别、邮箱、手机号等信息按行保存到userinfo.txt中，每个字段用“|”分隔，要求将密码以SHA256加密（可用JDK自带的java.security.MessageDigest实现）后写入文件，userinfo.txt文件格式如下： 如果当前注册的用户名不与已注册的用户名冲突，则提示“注册成功”，5秒后自动跳转或有超链接至登录页面，否则提示“你的用户名已被注册，请返回重新注册”。
（2）登录页面login.html。用户登录页面需判断用户名或密码是否为空，登录成功与否由映射地址为login.do的LoginServlet.java处理，该Servlet从userinfo.txt查询判断用户名与密码是否一致，如果一致则跳转至欢迎页面welcome.html提示“登录成功！”，否则跳转至失败页面failed.html提示“用户名或密码错误，请重新登录”，其中“重新登录”为超链接，可以跳转至登录页面login.html。
userinfo.txt的格式:
登录界面：
注册界面：
以下是基于本题的代码，html主题模块不提供注释，Java Script和Servlet提供注释：
//登录界面
<html>
<head>
<meta charset="UTF-8">
<title>51job的会员登陆界面</title>
<script language="JavaScript" type="text/javascript">
function custCheck() {
var userName = document.getElementById("userName");
var password = document.getElementById("password");
//用户名判空
if (userName.value == "" || userName.value == "请输入用户名") {
alert("用户名不能为空!");
return false;
//密码判空
} else if (password.value == "" || password.value == "请输入密码") {
alert("密码不能为空!");
return false;
}
return true;
}
</script>
</head>
<style>
.div1{
position: fixed;
width: 200px;
height: 150px;
top:30%;
left: 43%;
/*margin-top: -75px;*/
/*margin-left:-100px ;*/
}
</style>
<body>
<div class="div1">
<form action="login.do" method="post" onsubmit="return custCheck()">
<table style="border: 1px solid #0000FF;" rules=none cellspacing=0 width=340 align=center >
<tr height=40>
<td colspan=2>
<h2 align=center>
<font color=blue>企业会员登录</font>
</h2>
</td>
</tr>
<tr height=40>
<td height=40 align=right width=80>用 户 名</td>
<td width=240><input style="width: 95%; height: 25px;"
type="text" value="请输入用户名"
onFocus="if(value==defaultValue){value='';this.style.color='#000'}"
onBlur="if(!value){value=defaultValue; this.style.color='#999'}"
style="color: #999" name="userName" id="userName"></td>
</tr>
<tr height=40>
<td height=40 align=right width=80>密 码</td>
<td width=240><input style="width: 95%; height: 25px;"
type="text" value="请输入密码"
onFocus="if(value==defaultValue){value='';this.style.color='#000'}"
onBlur="if(!value){value=defaultValue; this.style.color='#999'}"
style="color: #999" name="password" id="password"></td>
</tr>
<tr height=40>
<td height=40 colspan=2 align=center>
<input type="image" src="login.png" name="img" />
</td>
</tr>
<tr height=40>
<td height=40 colspan=2 align=right>没有帐号？
<a href="register.html" style='text-decoration: none;'>
<font color=red>免费注册 </font></a>
</td>
</tr>
</table>
</form>
</div>
</body>
</html> //注册界面
<html>
<head>
<meta charset="UTF-8">
<title>51job的会员登陆界面</title>
</head>
<script language="JavaScript" type="text/javascript">
function custCheck() {
var userName = document.getElementById("userName");
var password = document.getElementById("password");
var name=document.getElementById("name");
var mail=document.getElementById("mail");
var tel=document.getElementById("tel");
var sex=document.getElementsByName("sex");
var pattern=/(^[0-9]{3,4}\-[0-9]{3,8}$)|(^[0-9]{3,8}$)|(^[0−9]3,4[0-9]{3,8}$)|(^0{0,1}13[0-9]{9}$)/; //验证电话号码的正则表达式
var reg = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*?[#?!@$%^&*.-]).{8,}$/;//对于密码格式的正则表达式，需求为数字，大小写字母和特殊字符
var emailRegExp=/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;//验证邮箱的正则表达式
//判空和手机号、邮箱、密码的合法性判别
if (userName.value == "" || userName.value == "请输入您的用户名") {
alert("用户名不能为空!");
return false;
} else if (password.value == "" || password.value == "请输入您的密码") {
alert("密码不能为空!");
return false;
}else if (name.value == "" || name.value == "请输入您的姓名"){
alert("姓名不能为空!");
return false;
}else if(mail.value == "" || mail.value == "请输入您的邮箱"){
alert("邮箱不能为空!");
return false;
}else if (tel.value == "" || tel.value == "请输入您的手机号"){
alert("手机号不能为空!");
return false;
}else if(!emailRegExp.test(mail.value)){
alert("邮箱格式不合法");
return false;
}else if(!pattern.test(tel.value.replace(/\s+/g,'').replace(/-/g,'')) ){
alert("手机号不合法");
return false;
}else if(!reg.test(password.value)){
alert("密码为数字、大小写字母和特殊字符的组合（不少于8位）");
return false;
}
//试验代码
// for(var i=0;i<sex.length;i++){
// if(sex[i].checked==true){
// break;
// }
// if(i==sex.length-1){
// alert("性别不能为空!");
// return false;
// }
// }
if(sex[0].checked != true && sex[1].checked != true){
alert("性别不能为空!");
return false;
}
return true;
}
</script>
<style>
.div1{
position: fixed;
width: 200px;
height: 150px;
top:30%;
left: 43%;
}
</style>
<body>
<div class="div1">
<form action="register.do" method="post" onsubmit="return custCheck()">
<table style="border: 1px solid #0000FF;" rules=none cellspacing=0 width=340 align=center >
<tr height=40>
<td colspan=2>
<h2 align=center>
<font color=blue>用户注册</font>
</h2>
</td>
</tr>
<tr height=40>
<td height=40 align=right width=80>用 户 名</td>
<td width=240><input style="width: 95%; height: 25px;"
type="text" value="请输入您的用户名"
onFocus="if(value==defaultValue){value='';this.style.color='#000'}"
onBlur="if(!value){value=defaultValue; this.style.color='#999'}"
style="color: #999" name="userName" id="userName"></td>
</tr>
<tr height=40>
<td height=40 align=right width=80>密 码</td>
<td width=240><input style="width: 95%; height: 25px;"
type="text" value="请输入您的密码"
onFocus="if(value==defaultValue){value='';this.style.color='#000'}"
onBlur="if(!value){value=defaultValue; this.style.color='#999'}"
style="color: #999" name="password" id="password"></td>
</tr>
<tr height=40>
<td height=40 align=right width=80>姓 名</td>
<td width=240><input style="width: 95%; height: 25px;"
type="text" value="请输入您的姓名"
onFocus="if(value==defaultValue){value='';this.style.color='#000'}"
onBlur="if(!value){value=defaultValue; this.style.color='#999'}"
style="color: #999" name="name" id="name"></td>
</tr>
<tr height=40>
<td height=40 align=right width=80>性 别</td>
<td>
<div>
<input type="radio" name="sex" value="男" >男
<input type="radio" name="sex" value="女" >女
</div>
</td>
</tr>
<tr height=40>
<td height=40 align=right width=80>邮 箱</td>
<td width=240><input style="width: 95%; height: 25px;"
type="text" value="请输入您的邮箱"
onFocus="if(value==defaultValue){value='';this.style.color='#000'}"
onBlur="if(!value){value=defaultValue; this.style.color='#999'}"
style="color: #999" name="mail" id="mail"></td>
</tr>
<tr height=40>
<td height=40 align=right width=80>手 机 号</td>
<td width=240><input style="width: 95%; height: 25px;"
type="text" value="请输入您的手机号"
onFocus="if(value==defaultValue){value='';this.style.color='#000'}"
onBlur="if(!value){value=defaultValue; this.style.color='#999'}"
style="color: #999" name="tel" id="tel"></td>
</tr>
<tr height=40>
<td height=40 colspan=2 align=center>
<input type="image" src="login.png" name="img" />
</td>
</tr>
</table>
</form>
</div>
</body>
</html>以下是两个主体的Servlet，具体跳转界面不提供：
RegisterServlet：
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;
import org.apache.commons.codec.binary.Hex;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
@WebServlet("/register.do")
public class RegisterServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
String userName=request.getParameter("userName");
String password=request.getParameter("password");
String name=request.getParameter("name");
String mail=request.getParameter("mail");
String tel=request.getParameter("tel");
String[] sex=request.getParameterValues("sex");
PrintWriter out=response.getWriter();
out.println("<html><head>");
out.println("<title>注册</title>");
out.println("</head><body>");
out.println("<h4>注册中……</h4>");
out.println("</body></html>");
File file = new File("C:/Users/16287/IdeaProjects/登录注册/src/userinfo.txt");
InputStreamReader isr = new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8);
BufferedReader br = new BufferedReader(isr);
//利用MessageDigest进行的SHA256加密
String temp;
MessageDigest messageDigest;
String encodeStr = "";
try {
messageDigest = MessageDigest.getInstance("SHA-256");
byte[] hash = messageDigest.digest(password.getBytes("UTF-8"));
encodeStr = Hex.encodeHexString(hash);//利用了Apache工具包里的Hex进制转换函数
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
boolean judge;
judge=true;
while((temp=br.readLine())!=null){
String s[]=temp.split("\\|");
if(userName.equals(s[0])){
judge=false;
response.setHeader("Refresh","3;URL=regfailed.html");//注册失败跳转
}
}
if(judge){
BufferedWriter bw= new BufferedWriter(new FileWriter(file, true));
String content;
content=userName+"|"+encodeStr+"|"+name+"|"+sex[0]+"|"+mail+"|"+tel;//写入userinfo.txt的字符串
bw.write(content);
bw.newLine();
bw.close();
response.setHeader("Refresh","3;URL=refresh.html");//注册成功跳转登录页面的中转网站
}
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
}
LoginServlet：
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
@WebServlet("/login.do")
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out=response.getWriter();
out.println("<html><head>");
out.println("<title>登录</title>");
out.println("</head><body>");
out.println("<h4>登录中……</h4>");
out.println("</body></html>");
String userName=request.getParameter("userName");
String password=request.getParameter("password");
String temp;
MessageDigest messageDigest;
String encodeStr = "";
File file = new File("C:/Users/16287/IdeaProjects/登录注册/src/userinfo.txt");
InputStreamReader isr = new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8);
BufferedReader br = new BufferedReader(isr);
//通过直接对输入密码加密和userinfo.txt内部的已加密代码的比较判断密码输入是否正确
try {
messageDigest = MessageDigest.getInstance("SHA-256");
byte[] hash = messageDigest.digest(password.getBytes("UTF-8"));
encodeStr = Hex.encodeHexString(hash);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
while((temp=br.readLine())!=null){
String s[]=temp.split("\\|");
if(userName.equals(s[0])){
if(encodeStr.equals(s[1])){
response.setHeader("Refresh","3,welcome.html");//登录成功，进入welcome界面
}else{
response.setHeader("Refresh","3,failed.html");//登录失败，提示重新登录
}
}
}
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
}
具体实现界面不具备提供，题目的所有要求已经完成，因为使用了web4.0所以不提供非注释映射，web.xml没有进行解释，如有需要可以自行进行。
