一.进入QQ邮箱获取授权码

1.进入QQ邮箱点击，点击左上角的设置

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2.点击账户

然后拉下来，开启SMTP 服务，可以获取授权码，复制下来。

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二.maven依赖

        <dependency>
            <groupId >com.sun.mail</groupId >
            <artifactId >javax.mail</artifactId >
            <version >1.5.5</version >
        </dependency>
        <dependency >
            <groupId >javax.mail </groupId >
            <artifactId >mail</artifactId >
            <version >1.4.5</version >
        </dependency >

三.程序部分

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

public class EmailUtil{
    public static void sendEmail(String toEmail,String fromEmail,
                                 final String authEmail,final String authPaw,
                                 String title,String text){
        // 收件人电子邮箱
        String to = toEmail;

        // 发件人电子邮箱
        String from = fromEmail;

        // 指定发送邮件的主机为 localhost
        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");

        properties.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        properties.setProperty("mail.smtp.port", "465");
        properties.setProperty("mail.smtp.socketFactory.port", "465");

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

        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("I love u");
            message.setSubject(title);

            // 设置消息体
            message.setContent(text, "text/html;charset=UTF-8");
            // 发送 HTML 消息, 可以插入html标签
            // 发送消息
            Transport.send(message);
            System.out.println("Sent email successfully...");
        }catch (MessagingException mex) {
            mex.printStackTrace();
        }
    }

    public static void main(String[] args) {
        EmailUtil.sendEmail("XXXXXX(收件人邮箱)@qq.com","XXXXXX(发件人邮箱)@qq.com","(授权邮箱，一般就是填发件人邮箱)XXXXX@qq.com","发件人的QQ邮箱里的授权码","邮件名","邮件内容");
    }
}

四.测试

image.png

发送成功！！！