#創(chuàng)建數(shù)據(jù)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(biāo)識(shí)是否已經(jīng)激活 0未激活1已激活
 code varchar(64) not null
);

//創(chuàng)建數(shù)據(jù)庫對(duì)應(yīng)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
}

//數(shù)據(jù)庫操作類UserDao
public class UserDao{
 private Connection conn ;
 //獲取數(shù)據(jù)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(cè)
 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(guān)閉數(shù)據(jù)庫連接
 public void closeConn(){
  if(conn != null){
   conn.close();
  }
 }
}

//一個(gè)工具類，用于獲取隨機(jī)code注冊(cè)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(shí)現(xiàn)
<form action="<%=request.getContextPath()%>/regist.do" method="post">
 <tr>
  <td><label for="username">賬號(hào)</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(cè)" /></td>
  <td><input type="reset" name="重寫" /></td>
 </tr>
</form>

//發(fā)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?yàn)槭潜镜販y試，所以第一個(gè)參數(shù)直接創(chuàng)建默認(rèn)的即可
  Session session = Session.getInstance(new Properties(),new Authenticator() {
    @Override
    protected PasswordAuthentication getPasswordAuthentication(){
     return new PasswordAuthentication("server@store.com", "111");
    }
   });

  //創(chuàng)建郵件對(duì)象
  Message message = new MimeMessage(session);
  //設(shè)置發(fā)件人，這里我創(chuàng)建了一個(gè)server@store.com用于發(fā)送郵件
  message.setFrom(new InternetAddress("server@store.com"));
  message.setRecipient(RecipientType.TO, new InternetAddress(to));
  message.setSubject("來自個(gè)博網(wǎng)的注冊(cè)激活郵件");
  message.setContent("<a href='http://localhost:8080/RegistMailWeb/active.do'>點(diǎn)我激活</a>","text/html;charset=utf-8");

  //發(fā)送郵件
  Transport.send(message);
 } 
}


//regist.doServlet實(shí)現(xiàn)
public class RegistServlet extends HttpServlet{
 public void init(){
  super.init();
 }

 public void service(HttpServletRequest request,HttpServletResponse response){
  //獲取數(shù)據(jù)
  String username = request.getParameter("username");
  String password = request.getParameter("password");
  String nickname = request.getParameter("nickname");
  String email = request.getParameter("email");

  //封裝數(shù)據(jù)
  UserBean user = new UserBean();
  user.setUsername(username);
  user.setPassword(password);
  user.setNickname(nickname);
  user.setEmail(email);
  user.setCode(UUIDUtils.getUUID());

  //注冊(cè)
  UserDao dao = new UserDao();
  dao.getConn();
  dao.regist(user);
  dao.closeConn();

  //發(fā)送郵件
  SendMailUtils.sendMail(email,user.getCode());
 }

 public void destroy(){
  super.desroy();
 }
} 

//創(chuàng)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(shù)據(jù)
  String code = request.getParameter("code");

  //數(shù)據(jù)庫判斷對(duì)應(yīng)code是否存在，（這里就不進(jìn)行判斷了，直接進(jìn)行比對(duì)）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>