javamail实现注册激活邮件

#创建数据库表
create database javamail;
use javamail;
create table user(
 id int primary key auto_increment,
 username varchar(30) not null,
 password varchar(30) not null,
 nickname varchar(30) not null,
 email varchar(30) not null,
 state int default 0, #标识是否已经激活 0未激活1已激活
 code varchar(64) not null
);
//创建数据库对应的javabean
public class UserBean{
 private Integer id;
 private String username;
 private String password;
 private String nickname;
 private String email;
 private Integer state;
 private String code;
 //省略setter and getter
}
//数据库操作类UserDao
public class UserDao{
 private Connection conn ;
 //获取数据库连接
 public void getConn(){
  Class.forName("com.mysql.jdbc.Driver");
  String url = "mysql:jdbc://localhost:3306/javamail";
  String rootname = "root";
  String rootpass = "chengxi";
  conn = DriverManager.getConnection(url,rootname,rootpass);
 }
 //注册
 public void regist(UserBean user){
  String sql = "insert into user(username,password,nickname,email,code) values(?,?,?,?,?)";
  PreparedStatement pstmt = conn.preparedCall(sql);
  pstmt.setString(1,user.getUsername());
  pstmt.setString(2,user.getPassword());
  pstmt.setString(3,user.getNickname());
  pstmt.setStirng(4,user.getEmail());
  pstmt.setString(5,user.getCode());
  pstmt.executeUpdate(); 
 }
 //激活
 public void activeByCode(String code){
  String sql = "update user set state=1,code=null where code=?";
  PreparedStatement pstmt = conn.preparedCall(sql);
  pstmt.setString(1,code);
  pstmt.executeUpdate(); 
 }
 //关闭数据库连接
 public void closeConn(){
  if(conn != null){
   conn.close();
  }
 }
}
//一个工具类，用于获取随机code注册激活码
public class UUIDUtils{
 public static String getUUID(){
  return UUID.randomUUID().toString().replace("-","")+UUID.randomUUID().toString().replace("-","");
 }
}
//index.jsp前端页面实现
<form action="<%=request.getContextPath()%>/regist.do" method="post">
 <tr>
  <td><label for="username">账号</label></td>
  <td><input type="text" name="username" /></td>
 </tr>
 <tr>
  <td><label for="password">密码</label></td>
  <td><input type="text" name="password" /></td>
 </tr>
 <tr>
  <td><label for="nickname">昵称</label></td>
  <td><input type="text" name="nickname" /></td>
 </tr>
 <tr>
  <td><label for="email">邮箱</label></td>
  <td><input type="text" name="email" /></td>
 </tr>
 <tr>
  <td><input type="submit" value="注册" /></td>
  <td><input type="reset" name="重写" /></td>
 </tr>
</form>
//发送邮件的Utils工具类
public class SendMailUitls{
 public static void sendMail(String to,String code){
  //session是mail包下的，因为是本地测试，所以第一个参数直接创建默认的即可
  Session session = Session.getInstance(new Properties(),new Authenticator() {
    @Override
    protected PasswordAuthentication getPasswordAuthentication(){
     return new PasswordAuthentication("server@store.com", "111");
    }
   });
  //创建邮件对象
  Message message = new MimeMessage(session);
  //设置发件人，这里我创建了一个server@store.com用于发送邮件
  message.setFrom(new InternetAddress("server@store.com"));
  message.setRecipient(RecipientType.TO, new InternetAddress(to));
  message.setSubject("来自个博网的注册激活邮件");
  message.setContent("<a href='http://localhost:8080/RegistMailWeb/active.do'>点我激活</a>","text/html;charset=utf-8");
  //发送邮件
  Transport.send(message);
 } 
}
//regist.doServlet实现
public class RegistServlet extends HttpServlet{
 public void init(){
  super.init();
 }
 public void service(HttpServletRequest request,HttpServletResponse response){
  //获取数据
  String username = request.getParameter("username");
  String password = request.getParameter("password");
  String nickname = request.getParameter("nickname");
  String email = request.getParameter("email");
  //封装数据
  UserBean user = new UserBean();
  user.setUsername(username);
  user.setPassword(password);
  user.setNickname(nickname);
  user.setEmail(email);
  user.setCode(UUIDUtils.getUUID());
  //注册
  UserDao dao = new UserDao();
  dao.getConn();
  dao.regist(user);
  dao.closeConn();
  //发送邮件
  SendMailUtils.sendMail(email,user.getCode());
 }
 public void destroy(){
  super.desroy();
 }
} 
//创建active.do Servlet用于激活邮箱
public class ActiveServlet HttpServlet{
 public void init(){
  super.init();
 }
 public void service(HttpServletRequest request,HttpServletResponse response){
  //获取数据
  String code = request.getParameter("code");
  //数据库判断对应code是否存在，（这里就不进行判断了，直接进行比对）state=1&code=null代表激活
  UserDao dao = new UserDao();
  dao.activeByCode(code);
  //重定向success.jsp
  request.getRequestDispatcher("/WEB-INF/success.jsp").forward(request,response);
 }
 public void destroy(){
  super.destroy();
 }
}

<html>
 <head>
  <title>成功激活</title>
 </head>
 <body>
  <script>
   window.onload = function(){
    alert("已成功激活");
   };
  </script>
 </body>
</html>

<servlet>
 <servlet-name>RegistServlet</servlet-name>
 <servlet-class>com.servlet.RegistServlet</servlet-class>
</servlet>
<servlet-mapping>
 <servlet-name>RegistServlet</servlet-name>
 <url-pattern>/regist.do</url-pattern>
</servlet-mapping>
<servlet>
 <servlet-name>ActiveServlet</servlet-name>
 <servlet-class>com.servlet.ActiveServlet</servlet-class>
</servlet>
<servlet-mapping>
 <servlet-name>ActiveServlet</servlet-name>
<url-pattern>/active.do</url-pattern>