影院管理系统的后台（一）： 注册
人机界面课团队完成影院管理系统界面的设计，在此基础上添加后台。
首先先完善注册和登录的功能。
注册：使用JavaMail的方法，向一个邮箱发送邮件，邮件里包含一个链接，点击链接后激活。
界面登录代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
剧院管理系统
用 户 登 录
注册界面代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
用户注册界面
注册页面
跳转逻辑：
编写两个类：UserDao,UserManager
UserManager类包含的方法：
注册用户（生成激活码，并调用UserDao的AddUser添加用户，调用发送邮件方法）：
public Boolean Register(String username,String password,String email){
Boolean result=false;
//生成用户code
String code=UUID.randomUUID().toString().replace("-", "");
//添加用户
UserDao userDao=new UserDao();
result=userDao.AddUser(username, password, email, code);
//向用户发送激活邮件
sendMail(email,code);
return result;
}
发送激活邮件（使用JavaMail发送，邮件内容为一个链接（跳转到ActiveServlet-激活激活码））：
public static boolean sendMail(String to, String code) {
try {
Properties props = new Properties();
props.put("username", "发送邮箱名");
props.put("password", "邮箱密码");
props.put("mail.transport.protocol", "smtp" );
props.put("mail.smtp.host", "smtp.163.com");
props.put("mail.smtp.port", "25" );
Session mailSession = Session.getDefaultInstance(props);
Message msg = new MimeMessage(mailSession);
msg.setFrom(new InternetAddress("[email protected]"));
msg.addRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
msg.setSubject("激活邮件");
msg.setContent("此邮件为官方激活邮件！请点击下面链接完成激活操作！
http://localhost:8080/ONETTMS/ActiveServlet
","text/html;charset=UTF-8");
msg.saveChanges();
Transport transport = mailSession.getTransport("smtp");
transport.connect(props.getProperty("mail.smtp.host"), props
.getProperty("username"), props.getProperty("password"));
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
} catch (Exception e) {
e.printStackTrace();
System.out.println(e);
return false;
}
return true;
} 激活用户（通过激活码找到对应的用户名，调用UserDao的setState方法将用户设为可用）：
public Boolean Active(String code){
UserDao userDao=new UserDao();
String username=userDao.findUserByCode(code);
if(username!=null && username!=""){
//如果存在用户，将此用户状态设为可用
userDao.setState(username);
return true;
}else{
return false;
}
}UserDao包含的方法：
向数据库中添加用户（用户信息：用户名，密码，邮箱，激活码，状态）：
public Boolean AddUser(String username,String password,String email,String code){
Boolean result=false;
Connection conn=null;
String sql="insert into t_user(username,password,email,code,state) values(?,?,?,?,?)";
try {
//注册驱动
Class.forName("com.mysql.jdbc.Driver");
//建立连接
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/SendMail","root","密码");
PreparedStatement pstmt=conn.prepareStatement(sql);
pstmt.setString(1,username);
pstmt.setString(2,password);
pstmt.setString(3,email);
pstmt.setString(4,code);
pstmt.setInt(5,0);
result=pstmt.execute();
}catch(ClassNotFoundException e){
e.printStackTrace();
}catch (SQLException e) {
e.printStackTrace();
}
return result;
}获得激活码对应的用户名：
public String findUserByCode(String code) {
String username="";
Connection conn=null;
ResultSet rs=null;
String sql="select username from t_user where code=?";
try {
//注册驱动
Class.forName("com.mysql.jdbc.Driver");
//建立连接
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/SendMail","root","密码");
PreparedStatement pstmt=conn.prepareStatement(sql);
pstmt.setString(1,code);
rs=pstmt.executeQuery();
if(rs.next()){
username=rs.getString("username");
}
}catch(ClassNotFoundException e){
e.printStackTrace();
}catch (SQLException e) {
e.printStackTrace();
}
return username;
}将用户状态设为可用（通过 已知的用户名）：
public Boolean setState(String username) {
Boolean result=false;
Connection conn=null;
String sql="update t_user set state=1 where username=?";
try {
//注册驱动
Class.forName("com.mysql.jdbc.Driver");
//建立连接
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/SendMail","root","密码");
PreparedStatement pstmt=conn.prepareStatement(sql);
pstmt.setString(1,username);
int i=pstmt.executeUpdate();
if(i>0){
result=true;
}
}catch(ClassNotFoundException e){
e.printStackTrace();
}catch (SQLException e) {
e.printStackTrace();
}
return result;
}（注册界面的红色文本）跳转到了RegisterServlet
package servlet;
import java.io.IOException;
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 service.UserManager;
@WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = -4330309819191817539L;
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String username=req.getParameter("username");
String password=req.getParameter("password");
String email=req.getParameter("email");
UserManager userManager=new UserManager();
if(userManager.Register(username, password, email)){
//注册成功后，转发到成功界面
req.setAttribute("message", "注册成功！");
req.getRequestDispatcher("/succes.jsp").forward(req,resp);
}
}
}
这样的话，就已经向数据库里添加了用户，但是这个时候用户的状态还是初始状态。去用户填写的邮箱，已经收到了激活邮件，点击邮件中的链接，链接包含了激活码。所以在ActiveServlet中可以通过request获取传递过来的code，然后调用方法激活。
package servlet;
import java.io.IOException;
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 service.UserManager;
@WebServlet("/ActiveServlet")
public class ActiveServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String code=req.getParameter("code");
UserManager userManager=new UserManager();
if(userManager.Active(code)){
//激活成功后，转发到成功界面
req.setAttribute("message", "激活成功！");
req.getRequestDispatcher("/succes.jsp").forward(req,resp);
}
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req,resp);
}
}