JavaMail - 注冊登陸郵箱驗證激活

前言：

1、郵件發送協定 - SMTP，預設端口号 25。

用于把使用者郵件從一個伺服器轉到下一個伺服器

2、郵件接收協定 - POP3，預設端口号 110。

用于支援使用用戶端遠端管理在伺服器上的電子郵件

3、搭建郵件伺服器（易郵郵件伺服器 + Foxmail）：​​Email - 搭建自定義郵件伺服器​​

核心Jar包

核心代碼

package com.jy.utils;

import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.search.RecipientStringTerm;
import sun.nio.cs.MS1250;

/**
 * 郵箱工具
 */
public class MailUtil {
  
  public static void sendMail(String to,String code) throws Exception{

    // 1.建立連接配接對象
    Session session = Session.getDefaultInstance(new Properties(), new Authenticator() {
      @Override
      protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication("[email protected]", "123456");
      }
    });

    // 2.建立郵件對象
    Message message = new MimeMessage(session);
    message.setFrom(new InternetAddress("[email protected]"));
    message.setRecipient(RecipientType.TO, new InternetAddress(to));

    //主題
    message.setSubject("來自dt的激活郵件");

    //正文
    message.setContent("<h1>來自dt的激活郵件，點選連結激活賬号：</h1><h3><a href='http://localhost:8081/javamail01/active?code="+code+"'>http://localhost:8081/javamail01/active?code="+code+"</a></h3>", "text/html;charset=utf-8");

    // 3.發送激活郵件
    Transport.send(message);
  }
}      

package com.jy.web.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 com.jy.domain.User;
import com.jy.service.UserService;
import com.jy.service.impl.UserServiceImpl;
import com.jy.utils.UUIDUtil;

@WebServlet(urlPatterns="/regist")
public class RegistServlet extends HttpServlet{

  private static final long serialVersionUID = 1L;

  @Override
  protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
    try{
      req.setCharacterEncoding("utf-8");
      res.setCharacterEncoding("utf-8");

      String username = req.getParameter("username");
      String password = req.getParameter("password");
      String nickname = req.getParameter("nickname");
      String email = req.getParameter("email");

      User user = new User();
      user.setNickname(nickname);
      user.setUsername(username);
      user.setCode(UUIDUtil.code());
      user.setStatus(0);  // 狀态碼，0未激活，1激活
      user.setEmail(email);
      user.setPassword(password);

      UserService userService = new UserServiceImpl();
      userService.save(user);

      req.setAttribute("msg", "注冊成功，請郵箱激活");
      req.getRequestDispatcher("/msg.jsp").forward(req, res);

    }catch(Exception e){
      
    }
  }
}      

package com.jy.web.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 com.jy.domain.User;
import com.jy.service.UserService;
import com.jy.service.impl.UserServiceImpl;

/**
 * 激活注冊郵箱
 */
@WebServlet(urlPatterns="/active")
public class ActiveServlet extends HttpServlet{
  
  private static final long serialVersionUID = 1L;

  @Override
  protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
    try{
      req.setCharacterEncoding("utf-8");
      res.setCharacterEncoding("utf-8");

      String code = req.getParameter("code");
      UserService userService = new UserServiceImpl();
      User user = userService.findByCode(code);
      if(user!=null){
        // 已經激活
        user.setStatus(1);
        user.setCode(null);
        userService.update(user);
        req.setAttribute("msg", "激活成功，請登入");
      }else{
        // 激活失敗
        req.setAttribute("msg", "激活失敗，重新激活");
      }

      req.getRequestDispatcher("/msg.jsp").forward(req, res);

    }catch(Exception e){
      
    }
  }
}      

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <h1>使用者注冊的頁面</h1>
    <form action="regist" method="post">
        <table width="600" border="1">
            <tr>
                <td>使用者名：</td>
                <td><input type="text" name="username"/></td>
            </tr>
            <tr>
                <td>密碼：</td>
                <td><input type="password" name="password"/></td>
            </tr>
            <tr>
                <td>昵稱：</td>
                <td><input type="text" name="nickname"/></td>
            </tr>
            <tr>
                <td>郵箱：</td>
                <td><input type="text" name="email"/></td>
            </tr>
            <tr>
                <td colspan="2"><input type="submit" value="送出"></td>
            </tr>
        </table>
    </form>
    
</body>
</html>      

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>資訊回報頁面</title>
</head>
<body>
    ${msg}
</body>
</html>