引入两个包

  javax.mail
  mail
  1.4.7




  javax.activation
  activation
  1.1.1

正文：

package Com.Ren.Mail;

import com.sun.mail.util.MailSSLSocketFactory;
import org.junit.Test;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.security.GeneralSecurityException;
import java.util.Properties;

public class SendMail02 {

    @Test
    public void sendMail() throws Exception {
        Properties properties = new Properties();
        properties.setProperty("mail.host","smtp.qq.com"); //设置QQ邮件服务器
        properties.setProperty("mail.transport.protocol","smtp");//邮件发送协议
        properties.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，加上一下代码即可
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        properties.put("mail.smtp.ssl.enable","true");
        properties.put("mail.smtp.ssl.socketFactory",sf);
        //javaMail发送邮件的五个步骤
        //1. 创建定义整个应用程序所需的环境信息的Session对象

        Session session = Session.getDefaultInstance(properties, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                //发件人姓名，授权码
                return new PasswordAuthentication("2399296974@qq.com", "hulxblvgclzjecaa");
            }
        });
        //开启Session的debug模式，这样就可以查看到程序发送email的运行状态

        //2. 通过Session得到transport对象
        Transport transport = session.getTransport();


        //3. 使用邮箱的用户名和授权码连接上邮件服务器

        transport.connect("smtp.qq.com","2399296974@qq.com", "hulxblvgclzjecaa");


        //4. 创建邮件
        MimeMessage mimeMessage = new MimeMessage(session);
        //指明邮件的发件人
        mimeMessage.setFrom(new InternetAddress("2399296974@qq.com"));
        //指明邮件的收件人
        mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress("renqingbo0@gmail.com"));
        //指明邮件标题
        mimeMessage.setSubject("欢迎你");
        //邮件的文本内容
        mimeMessage.setContent("
ni hao1
","text/html;charset=utf-8");

        //准备图片数据
        MimeBodyPart img = new MimeBodyPart();
        //图片数据处理
        DataHandler dataHandler = new DataHandler(new FileDataSource("F:\\javacode\\FileUpload\\src\\main\\resources\\1.jpg"));
        img.setDataHandler(dataHandler);
        img.setContentID("bz.jpg");

        //正文数据
        MimeBodyPart text = new MimeBodyPart();
        text.setContent("这是一个带图片的文件","text/html;charset=utf-8");

        //将各个模块加入到总模块中
        MimeMultipart mimeMultipart = new MimeMultipart();
        mimeMultipart.addBodyPart(img);
        mimeMultipart.addBodyPart(text);
        mimeMultipart.setSubType("related");

        //将总模块加入到消息中
        mimeMessage.setContent(mimeMultipart);
        mimeMessage.saveChanges();


        //5. 发送邮件
            transport.sendMessage(mimeMessage, mimeMessage.getAllRecipients());


            //关闭连接
            transport.close();


    }

}