[Java知识库]qq邮箱，网易邮箱，smtp邮箱发邮件

SMTP是一种提供可靠且有效的电子邮件传输的协议。

SMTP协议：SMTP是建立在FTP文件传输服务上的一种邮件服务，主要用于系统之间的邮件信息传递，并提供有关来信的通知。SMTP独立于特定的传输子系统，且只需要可靠有序的数据流信道支持，SMTP的重要特性之一是其能跨越网络传输邮件，即“SMTP邮件中继”。使用SMTP，可实现相同网络处理进程之间的邮件传输，也可通过中继器或网关实现某处理进程与其他网络之间的邮件传输。

QQ邮箱和网易邮箱均可通过SMTP协议实现发邮件，具体设置如下：
如何开启QQ邮箱SMTP协议
如何获取QQ邮箱授权码
如何开启网易邮箱SMTP协议
如何获取网易邮箱授权码

发送邮件代码如下：

1. pom文件中引包

        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>javax.mail-api</artifactId>
            <version>1.6.2</version>
        </dependency>
        <dependency>
            <groupId>com.sun.mail</groupId>
            <artifactId>javax.mail</artifactId>
            <version>1.6.2</version>
        </dependency>

2. 定义邮件类

import lombok.Data;
import lombok.extern.slf4j.Slf4j;

/**
 * Description:
 *
 * @author: pavelchen
 * @createDate: 2022/3/8
 */
@Data
@Slf4j
public class MailSender {

    /**
     * 邮件服务器ip地址
     */
    private String mailServerHost;

    /**
     * 端口
     */
    private String mailServerPort;

    /**
     * 发送邮箱地址
     */
    private String sendEmailAddress;

    /**
     * 发件人名称
     */
    private String sendEmailName;

    /**
     * 发送邮箱密码
     */
    private String sendEmailPassword;

    /**
     * 接收邮件地址
     */
    private String receiveEmailAddress;

    /**
     * 抄送邮件地址
     */
    private String ccEmailAddress;

    /**
     * 邮件主题
     */
    private String emailSubject;

    /**
     * 邮件内容类型
     */
    private String emailType;

    /**
     * 邮件内容
     */
    private String emailContent;

}

3. 定义SMTP邮件发送工具类

import com.alibaba.fastjson.JSONObject;
import com.sun.mail.util.MailSSLSocketFactory;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

/**
 * Description:
 *
 * @author: pavelchen
 * @createDate: 2022/3/8
 */
@Component
@Slf4j
public class SendEmail {
    /**
     * 发送邮件
     *
     * @param mailSender
     */
    @SneakyThrows
    public void sendEmail(MailSender mailSender) {
        Properties props = new Properties();
        props.put("mail.smtp.auth", "true"); // 是否需要用户认证
        props.setProperty("mail.smtp.ssl.enable", "true");
        props.put("mail.smtp.host", mailSender.getMailServerHost());
        props.put("mail.smtp.port", mailSender.getMailServerPort());
        props.put("mail.user", mailSender.getSendEmailAddress());
        props.put("mail.password", mailSender.getSendEmailPassword());

        // 获取默认session对象
        Session session = Session.getInstance(props, new Authenticator(){
            public PasswordAuthentication getPasswordAuthentication()
            {
                //发件人邮件用户名、授权码
                return new PasswordAuthentication(mailSender.getSendEmailAddress(), mailSender.getSendEmailPassword());
            }
        });

        // 创建默认的 MimeMessage 对象
        MimeMessage message = new MimeMessage(session);
        if (mailSender.getSendEmailName() == null) {
            message.setFrom(new InternetAddress(mailSender.getSendEmailAddress()));
        } else {
            message.setFrom(new InternetAddress(mailSender.getSendEmailAddress(), mailSender.getSendEmailName(), "UTF-8"));
        }
        String[] receive = mailSender.getReceiveEmailAddress().split(",");
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(receive[0]));
        if (receive.length > 1) {
            for (int i = 1; i < receive.length; i++) {
                message.addRecipient(Message.RecipientType.TO, new InternetAddress(receive[i]));
            }
        }
//        message.setRecipient(Message.RecipientType.CC, new InternetAddress(mailSender.getCcEmailAddress()));
        message.setSubject(mailSender.getEmailSubject());
        if ("html".equals(mailSender.getEmailType())) {
            message.setText(mailSender.getEmailContent(), "UTF-8", "html");
        } else {
            message.setText(mailSender.getEmailContent(), "UTF-8");
        }

        // 发送消息
        Transport.send(message);
    }
        
}

4. QQ邮箱发送

    @Autowired
    private SendEmail sendEmail;

    MailSender qqMailSender = new MailSender();
    qqMailSender.setMailServerHost("smtp.qq.com");
    qqMailSender.setMailServerPort("465");
    // 其它属性按需要填充
    // qqMailSender.setSendEmailAddress(...)
    // ....
    sendEmail.sendEmail(qqMailSender);

5. 网易邮箱发送

    @Autowired
    private SendEmail sendEmail;

    MailSender wyMailSender = new MailSender();
    wyMailSender.setMailServerHost("smtp.163.com");
    wyMailSender.setMailServerPort("465");
    // 其它属性按需要填充
    // wyMailSender.setSendEmailAddress(...)
    // ....
    sendEmail.sendEmail(wyMailSender);

6. SMTP邮箱发送

    @Autowired
    private SendEmail sendEmail;

    MailSender smtpMailSender = new MailSender();
    // 所有属性按需要填充
    // smtpMailSender.setMailServerHost(...)
    // ....
    sendEmail.sendEmail(smtpMailSender);