关于邮箱功能

@WebServlet("/activeUserServlet")
public class ActiveUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取激活码
        String code = request.getParameter("code");
        if(code != null){
            //2.调用service完成激活
            UserService service = new UserServiceImpl();
            boolean flag = service.active(code);

            //3.判断标记
            String msg = null;
            if(flag){
                //激活成功
                msg = "激活成功，请<a href='login.html'>登录</a>";
            }else{
                //激活失败
                msg = "激活失败，请联系管理员!";
            }
            response.setContentType("text/html;charset=utf-8");
            response.getWriter().write(msg);
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

    /**
     * 注册用户
     * @param user
     * @return
     */
    @Override
    public boolean regist(User user) {
        //1.根据用户名查询用户对象
        User u = userDao.findByUsername(user.getUsername());
        //判断u是否为null
        if(u != null){
            //用户名存在，注册失败
            return false;
        }
        //2.保存用户信息
        //2.1设置激活码，唯一字符串
        user.setCode(UuidUtil.getUuid());
        //2.2设置激活状态
        user.setStatus("N");
        userDao.save(user);

        //3.激活邮件发送，邮件正文？

        String content="<a href='http://localhost/travel/user/active?code="+user.getCode()+"'>点击激活</a>";

        MailUtils.sendMail(user.getEmail(),content,"激活邮件");

        return true;
    }

    /**
     * 修改指定用户激活状态
     * @param user
     */
    @Override
    public void updateStatus(User user) {
        String sql = " update tab_user set status = 'Y' where uid=?";
        template.update(sql,user.getUid());
    }　　

/**
 * 发邮件工具类
 */
public final class MailUtils {
    private static final String USER = ""; // 发件人称号，同邮箱地址
    private static final String PASSWORD = ""; // 如果是qq邮箱可以使户端授权码，或者登录密码

    /**
     *
     * @param to 收件人邮箱
     * @param text 邮件正文
     * @param title 标题
     */
    /* 发送验证信息的邮件 */
    public static boolean sendMail(String to, String text, String title){
        try {
            final Properties props = new Properties();
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.host", "smtp.qq.com");

            // 发件人的账号
            props.put("mail.user", USER);
            //发件人的密码
            props.put("mail.password", PASSWORD);

            // 构建授权信息，用于进行SMTP进行身份验证
            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    // 用户名、密码
                    String userName = props.getProperty("mail.user");
                    String password = props.getProperty("mail.password");
                    return new PasswordAuthentication(userName, password);
                }
            };
            // 使用环境属性和授权信息，创建邮件会话
            Session mailSession = Session.getInstance(props, authenticator);
            // 创建邮件消息
            MimeMessage message = new MimeMessage(mailSession);
            // 设置发件人
            String username = props.getProperty("mail.user");
            InternetAddress form = new InternetAddress(username);
            message.setFrom(form);

            // 设置收件人
            InternetAddress toAddress = new InternetAddress(to);
            message.setRecipient(Message.RecipientType.TO, toAddress);

            // 设置邮件标题
            message.setSubject(title);

            // 设置邮件的内容体
            message.setContent(text, "text/html;charset=UTF-8");
            // 发送邮件
            Transport.send(message);
            return true;
        }catch (Exception e){
            e.printStackTrace();
        }
        return false;
    }

    public static void main(String[] args) throws Exception { // 做测试用
        MailUtils.sendMail("itcast_xian@163.com","你好，这是一封测试邮件，无需回复。","测试邮件");
        System.out.println("发送成功");
    }



}