servlet邮箱的连接

首先要在pom.xml中导入依赖，都是零几年都停更的依赖

    
      javax.mail
      mail
      1.4.7
    
    
      javax.activation
      activation
      1.1.1
    

然后是编写uitl类，这里为了优化用户体验，采用多线程的方式进行

package com.fan.util;

import com.fan.pojo.User;
import com.sun.mail.util.MailSSLSocketFactory;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.security.GeneralSecurityException;
import java.util.Properties;

//提高用户体验  异步处理
public class Sendmail extends Thread{

    //用于给用户发送邮件的邮箱
    private String from = "291418260@qq.com";
    //邮箱用户名
    private String username = "291418260@qq.com";
    //邮箱密码
    private String password = "gtbuxuuzklojbjei";
    //发送邮箱的服务器地址
    private String host = "smtp.qq.com";

    private User user;
    public Sendmail(User user){
        this.user = user;
    }

    @Override
    public void run() {
        try {
            Properties prop = new Properties();
            prop.setProperty("mail.host","smtp");//设置邮箱服务器
            prop.setProperty("mail.transport.protocol","smtp");//邮箱发送协议
            prop.setProperty("mail.smtp.auth","ture");//需要验证用户名密码

            //关于qq邮箱，还要设置SSL加密，加上以下代码即可
            MailSSLSocketFactory sf = new MailSSLSocketFactory();
            sf.setTrustAllHosts(true);
            prop.put("mail.smtp.ssl.enable","true");
            prop.put("mail.smtp.ssl.socketFactory",sf);

            
            //1.创建定义整个应用程序所需的环境信息的Session对象

            //qq才有的一部分
            Session session = Session.getDefaultInstance(prop, new Authenticator() {
                @Override
                public PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }
            });
            session.setDebug(true);
            //2.通过session得到transport对象
            Transport ts = session.getTransport();

            //3.使用邮箱的用户名和授权码连上邮件服务器
            ts.connect(host,username,password);

            //4.创建邮件
            MimeMessage message = new MimeMessage(session);
            //指明邮件发件人
            message.setFrom(new InternetAddress(from));

            //指明邮件的收件人
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(user.getEmail()));

            //邮件的标题
            message.setSubject("用户注册验证邮件");

            String info = "欢迎注册，您的验证码为 1124 ，请输入到网页进行验证";

            //邮件的文本内容
            message.setContent(info,"text/html;charset=UTF-8");

            //5.发送邮件
            ts.sendMessage(message,message.getAllRecipients());
            //关闭连接
            ts.close();
        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}

然后在dopost方法中调用，我在用户注册时用到了简易的邮箱验证方法，注意一定要使用start（）方法，不然多线程失去了作用。

package com.fan.servlet.user;

import com.fan.pojo.User;
import com.fan.service.user.UserService;
import com.fan.service.user.UserServiceImpl;
import com.fan.util.Constant;
import com.fan.util.Sendmail;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SecEmailServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        User user = new User();
        user.setEmail(req.getParameter("email"));
        UserService userService = new UserServiceImpl();
        boolean flag = userService.secEmail(user.getEmail());
        if (!flag){
            Sendmail sendmail = new Sendmail(user);
            sendmail.start();
            req.getSession().setAttribute("user",user);
            req.getSession().setAttribute("reg_error","邮件已发送，若为收到，请稍等片刻！");
            req.getRequestDispatcher("/register.jsp").forward(req,resp);
        }else {
            req.getSession().setAttribute("email_error","该邮箱地址已被注册过，请直接登录！");
            req.getRequestDispatcher("/sec_email.jsp").forward(req,resp);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

同样的结尾：敬畏狂神！