设置邮件自动发送（以QQ邮箱为例）

首先要说明，此邮件发送成功之后，收件人收件箱可以看到，但是发件人的发件箱是看不到的，

其次，需要发件人邮件所在的邮件服务器代理权限，

package com.ai.rai.group.system.mailSend;

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;

/**
 * @version 1.0
 * @ClassName SendEmail
 * @Description todo
 * @Author 74981
 * @Date 2018/9/3 15:18
 */
public class SendEmail {
    public static void main(String [] args) throws GeneralSecurityException
    {
        // 收件人电子邮箱
        String to = "[email protected]";

        // 发件人电子邮箱
        String from = "[email protected]";

        // 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(){
            public PasswordAuthentication getPasswordAuthentication()
            {
                return new PasswordAuthentication("[email protected]", "获取到的授权码（注意不是QQ邮箱的登陆密码）"); //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();
        }
    }
}

授权码获取：http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=28&&no=1001256

代码参考：http://www.runoob.com/java/java-sending-email.html

jar包下载：https://download.csdn.net/download/select_bin/10642964