#創建數據庫表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, #標識是否已經激活 0未激活1已激活 code varchar(64) not null);//創建數據庫對應的javabeanpublic 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}//數據庫操作類UserDaopublic class UserDao{ private Connection conn ; //獲取數據庫連接 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); } //注冊 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();  } //關閉數據庫連接 public void closeConn(){  if(conn != null){   conn.close();  } }}//一個工具類，用于獲取隨機code注冊激活碼public class UUIDUtils{ public static String getUUID(){  return UUID.randomUUID().toString().replace("-","")+UUID.randomUUID().toString().replace("-",""); }}//index.jsp前端頁面實現<form action="<%=request.getContextPath()%>/regist.do" method="post"> <tr>  <td><label for="username">賬號</label></td>  <td><input type="text" name="username" /></td> </tr> <tr>  <td><label for="password">密碼</label></td>  <td><input type="text" name="password" /></td> </tr> <tr>  <td><label for="nickname">昵稱</label></td>  <td><input type="text" name="nickname" /></td> </tr> <tr>  <td><label for="email">郵箱</label></td>  <td><input type="text" name="email" /></td> </tr> <tr>  <td><input type="submit" value="注冊" /></td>  <td><input type="reset" name="重寫" /></td> </tr></form>//發送郵件的Utils工具類public class SendMailUitls{ public static void sendMail(String to,String code){  //session是mail包下的，因為是本地測試，所以第一個參數直接創建默認的即可  Session session = Session.getInstance(new Properties(),new Authenticator() {    @Override    protected PasswordAuthentication getPasswordAuthentication(){     return new PasswordAuthentication("server@store.com", "111");    }   });  //創建郵件對象  Message message = new MimeMessage(session);  //設置發件人，這里我創建了一個server@store.com用于發送郵件  message.setFrom(new InternetAddress("server@store.com"));  message.setRecipient(RecipientType.TO, new InternetAddress(to));  message.setSubject("來自個博網的注冊激活郵件");  message.setContent("<a href='http://localhost:8080/RegistMailWeb/active.do'>點我激活</a>","text/html;charset=utf-8");  //發送郵件  Transport.send(message); } }//regist.doServlet實現public class RegistServlet extends HttpServlet{ public void init(){  super.init(); } public void service(HttpServletRequest request,HttpServletResponse response){  //獲取數據  String username = request.getParameter("username");  String password = request.getParameter("password");  String nickname = request.getParameter("nickname");  String email = request.getParameter("email");  //封裝數據  UserBean user = new UserBean();  user.setUsername(username);  user.setPassword(password);  user.setNickname(nickname);  user.setEmail(email);  user.setCode(UUIDUtils.getUUID());  //注冊  UserDao dao = new UserDao();  dao.getConn();  dao.regist(user);  dao.closeConn();  //發送郵件  SendMailUtils.sendMail(email,user.getCode()); } public void destroy(){  super.desroy(); }} //創建active.do Servlet用于激活郵箱public class ActiveServlet HttpServlet{ public void init(){  super.init(); } public void service(HttpServletRequest request,HttpServletResponse response){  //獲取數據  String code = request.getParameter("code");  //數據庫判斷對應code是否存在，（這里就不進行判斷了，直接進行比對）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>