Java 基于mail.jar 和 activation.jar 封装的邮件发送工具类

╰+哭是因爲堅強的太久メ 2021-09-21 15:22 390阅读 0赞

## 准备工作 ##

**发送邮件需要获得协议和支持! 开启服务 POP3/SMTP 服务**

> **如何开启 POP3/SMTP 服务：[https://blog.csdn.net/weixin\_44953227/article/details/112562613][https_blog.csdn.net_weixin_44953227_article_details_112562613]**

## 依赖 ##

mail.jar：[https://repo1.maven.org/maven2/javax/mail/mail/1.4.7/mail-1.4.7.jar][https_repo1.maven.org_maven2_javax_mail_mail_1.4.7_mail-1.4.7.jar]

activation.jar： [https://repo1.maven.org/maven2/javax/activation/activation/1.1.1/activation-1.1.1.jar][https_repo1.maven.org_maven2_javax_activation_activation_1.1.1_activation-1.1.1.jar]

Maven

<dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4.7</version>
    </dependency>
    
    <dependency>
        <groupId>javax.activation</groupId>
        <artifactId>activation</artifactId>
        <version>1.1.1</version>
    </dependency>

## 封装邮件发送工具类 ##

> 使用

// User user = new User("收件人用户名", "收件人密码", "收件人邮箱");
    User user = new User(username, password, email);
    // 用户注册成功, 使用线程来发送邮件, 防止阻塞
    SendMail sendMail = new SendMail(user);
    sendMail.start();

> 工具类

package com.pro.utils;
    
    import com.pro.pojo.User;
    import com.sun.mail.util.MailSSLSocketFactory;
    
    import javax.mail.*;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeMessage;
    import java.util.Properties;
    
    // 网站三秒原则
    public class SendMail extends Thread { 
        // 发送邮件的邮箱
        private String from = "33344466@qq.com";
        // 邮箱用户名
        private String username = "33344466@qq.com";
        // 授权码
        private String password = "absasyncawait";
        // 发送邮件的服务器地址
        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", host); // 设置qq邮件服务器
                prop.setProperty("mail.transport.protocol", "smtp"); // 邮件发送协议
                prop.setProperty("mail.smtp.auth", "true"); // 需要验证用户名密码
    
                // 关于qq邮箱, 还要设置SSL加密
                MailSSLSocketFactory sf = new MailSSLSocketFactory();
                sf.setTrustAllHosts(true);
                prop.put("mail.smtp.ssl.enable", "true");
                prop.put("mail.smtp.ssl.socketFactory", sf);
    
                // 使用 JavaMail 发送邮件的5个步骤
    
                // 1. 定义整个应用程序所需要的环境信息的 Session 对象
                // 这一步是qq邮箱才有, 其他邮箱不用
                Session session = Session.getDefaultInstance(prop, new Authenticator() { 
                    @Override
                    public PasswordAuthentication getPasswordAuthentication() { 
                        // 发件人邮箱 用户名和授权码
                        return new PasswordAuthentication(username, password);
                    }
                });
    
                // 开启 Session debugger 模式, 可以看到邮件发送的运行状态
                session.setDebug(true);
    
                // 2. 通过 Session得到 transport 对象
                Transport transport = session.getTransport();
    
                // 3. 使用邮箱用户名和授权码连上邮件服务器 (登陆)
                transport.connect(host, username, password);
    
                // 4. 创建邮件: 写邮件
                MimeMessage message = new MimeMessage(session);
    
    
                // ======== 写邮件 ========
                // 设置邮件的发件人
                message.setFrom(new InternetAddress(from));
                // 设置邮件的收件人
                message.setRecipient(Message.RecipientType.TO,new InternetAddress(user.getEmail()));
    
                // 邮件标题
                message.setSubject("用户注册通知");
                // 邮件文本内容
                String content = "<div>" +
                        "<span>恭喜你注册成功，你的用户名是：" +
                        user.getEmail() +
                        "，你的密码是：" +
                        user.getPassword() +
                        "，请妥善保管。</span>" +
                        "<a href='https://www.tmall.com/' target='_blank'>" +
                        "<img width='100%' src='https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2672619668,2196295127&fm=26&gp=0.jpg' />" +
                        "</a>" +
                        "<h4 style='color: red'>This email is sent from Java, 本邮件由Java程序发送, from to 33344466</h4>" +
                        "</div>";
                message.setContent(content, "text/html; charset=UTF-8");
                // ======== 写邮件 ========
    
    
                // 5. 发送邮件
                transport.sendMessage(message, message.getAllRecipients());
    
                // 关闭连接
                transport.close();
            } catch (Exception e) { 
                e.printStackTrace();
                throw new RuntimeException();
            }
        }
    }

[https_blog.csdn.net_weixin_44953227_article_details_112562613]: https://blog.csdn.net/weixin_44953227/article/details/112562613
[https_repo1.maven.org_maven2_javax_mail_mail_1.4.7_mail-1.4.7.jar]: https://repo1.maven.org/maven2/javax/mail/mail/1.4.7/mail-1.4.7.jar
[https_repo1.maven.org_maven2_javax_activation_activation_1.1.1_activation-1.1.1.jar]: https://repo1.maven.org/maven2/javax/activation/activation/1.1.1/activation-1.1.1.jar