前言：

1、邮件发送协议 - SMTP，默认端口号 25。

用于把用户邮件从一个服务器转到下一个服务器

2、邮件接收协议 - POP3，默认端口号 110。

用于支持使用客户端远程管理在服务器上的电子邮件

3、搭建邮件服务器（易邮邮件服务器 + Foxmail）：Email - 搭建自定义邮件服务器

核心Jar包

核心代码

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;/*** 邮箱工具*/
public class MailUtil {public static void sendMail(String to,String code) throws Exception{// 1.创建连接对象Session session = Session.getDefaultInstance(new Properties(), new Authenticator() {@Overrideprotected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication("service@dt.com", "123456");}});// 2.创建邮件对象Message message = new MimeMessage(session);message.setFrom(new InternetAddress("service@dt.com"));message.setRecipient(RecipientType.TO, new InternetAddress(to));//主题message.setSubject("来自dt的激活邮件");//正文message.setContent("
来自dt的激活邮件，点击链接激活账号：
http://localhost:8081/javamail01/active?code="+code+"
", "text/html;charset=utf-8");// 3.发送激活邮件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;@Overrideprotected 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);  // 状态码，0未激活，1激活user.setEmail(email);user.setPassword(password);UserService userService = new UserServiceImpl();userService.save(user);req.setAttribute("msg", "注册成功，请邮箱激活");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;/*** 激活注册邮箱*/
@WebServlet(urlPatterns="/active")
public class ActiveServlet extends HttpServlet{private static final long serialVersionUID = 1L;@Overrideprotected 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){// 已经激活user.setStatus(1);user.setCode(null);userService.update(user);req.setAttribute("msg", "激活成功，请登录");}else{// 激活失败req.setAttribute("msg", "激活失败，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"%>






用户注册的页面
用户名：
密码：
昵称：
邮箱：

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>






${msg}

源码下载：JavaMail-注册邮箱激活源码-Web开发代码类资源-CSDN下载

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