QQ邮件

实现用代码发送邮件的方式，这里选用QQ邮件。
参考：https://www.runoob.com/java/java-sending-email.html
1、pom.xml

<!--邮件-->
<!-- https://mvnrepository.com/artifact/com.sun.mail/javax.mail -->
<dependency>
  <groupId>com.sun.mail</groupId>
  <artifactId>javax.mail</artifactId>
  <version>1.6.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.activation/activation -->
<dependency>
  <groupId>javax.activation</groupId>
  <artifactId>activation</artifactId>
  <version>1.1.1</version>
</dependency>

2、准备邮箱账户
发送账号和接收账号
发送账号：
（1）需要开启IMAP、SMTP服务和Exchange服务

（2）需要生成授权码

3、代码

package com.skytreestudy.test;

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;

public class EamilSend {
    public static void main(String [] args) throws GeneralSecurityException
    {
        // 收件人电子邮箱
        String to = "36xxxxxxx8@qq.com";

        // 发件人电子邮箱
        String from = "1xxxxx178@qq.com";

        // 指定发送邮件的主机为 smtp.qq.com
        String host = "smtp.qq.com";  //QQ 邮件服务器

        // 获取系统属性
        Properties properties = System.getProperties();

        // 设置邮件服务器
        properties.setProperty("mail.smtp.host", host);

        properties.put("mail.smtp.auth", "true");
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.enable", "true");
        properties.put("mail.smtp.ssl.socketFactory", sf);
        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties,new Authenticator(){
            @Override
            public PasswordAuthentication getPasswordAuthentication()
            {
                //密码必须是生成的授权码，而不能是原密码
                return new PasswordAuthentication(from, "kddxxxxxxxxa"); //发件人邮件用户名、密码
            }
        });

        try{
            // 创建默认的 MimeMessage 对象
            MimeMessage message = new MimeMessage(session);

            // Set From: 头部头字段
            message.setFrom(new InternetAddress(from));

            // Set To: 头部头字段
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

            // Set Subject: 头部头字段
            message.setSubject("This is the Subject Line!");

            // 设置消息体
            message.setText("This is actual message");

            // 发送消息
            Transport.send(message);
            System.out.println("Sent message successfully....from runoob.com");
        }catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }
}

一般来说，需要自己配置的就四处：

• 发送方
• 接收方
• 发送方授权码
• 标题和消息

接收消息：