<dependency>

            <groupId>com.sun.mail</groupId>

            <artifactId>javax.mail</artifactId>

            <version>1.5.5</version>

        </dependency>

package com.test;

import java.io.File;

import java.util.ArrayList;

import java.util.List;

import java.util.Properties;

import javax.activation.DataHandler;

import javax.activation.DataSource;

import javax.activation.FileDataSource;

import javax.mail.BodyPart;

import javax.mail.MessagingException;

import javax.mail.Multipart;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeBodyPart;

import javax.mail.internet.MimeMessage;

import javax.mail.internet.MimeMultipart;

import org.apache.log4j.Logger;

import com.test.MailAuthenticator;

public class SendMail {

    // 日志记录

    private static Logger logger = Logger.getLogger(SendMail.class);

    public static MailAuthenticator authenticator;

    private MimeMessage message;

    private Session session;

    private Transport transport;

    private Properties properties = new Properties();

    private String mailHost = null;

    private String sender_username = null;

    private String sender_password = null;

    /**

     * 构造方法

     */

    public SendMail() {

        super();

    }

    /**

     * 供外界调用的发送邮件接口

     */

    public boolean sendEmail(String title, String content, List<String> receivers, List<File> fileList) {

        try {

            // 初始化smtp发送邮件所需参数

            initSmtpParams();

            // 发送邮件

            doSendHtmlEmail(title, content, receivers, fileList);

        } catch (Exception e) {

            logger.error(e);

        }

        return true;

    }

    /**

     * 初始化smtp发送邮件所需参数

     */

    private boolean initSmtpParams() {

        mailHost = "邮箱smtp服务器"; // 邮箱类型不同值也会不同

        sender_username = "发件人邮箱";

        sender_password = "发件人邮箱密码";

        properties.put("mail.smtp.host", mailHost);// mail.envisioncitrix.com

        properties.put("mail.smtp.auth", "true");

        properties.put("mail.transport.protocol", "smtp");

        properties.put("mail.smtp.starttls.enable", "true");

        properties.put("mail.smtp.ssl.checkserveridentity", "false");

        properties.put("mail.smtp.ssl.trust", mailHost);

        authenticator = new MailAuthenticator(sender_username, sender_password);

        session = Session.getInstance(properties, authenticator);

        session.setDebug(false);// 开启后有调试信息

        message = new MimeMessage(session);

        return true;

    }

    /**

     * 发送邮件

     */

    private boolean doSendHtmlEmail(String title, String htmlContent, List<String> receivers, List<File> fileList) {

        try {

            // 发件人

            InternetAddress from = new InternetAddress(sender_username);

            message.setFrom(from);

            // 收件人(多个)

            InternetAddress[] sendTo = new InternetAddress[receivers.size()];

            for (int i = 0; i < receivers.size(); i++) {

                sendTo[i] = new InternetAddress(receivers.get(i));

            }

            message.setRecipients(MimeMessage.RecipientType.TO, sendTo);

            // 邮件主题

            message.setSubject(title);

            // 添加邮件的各个部分内容，包括文本内容和附件

            Multipart multipart = new MimeMultipart();

            // 添加邮件正文

            BodyPart contentPart = new MimeBodyPart();

            contentPart.setContent(htmlContent, "text/html;charset=UTF-8");

            multipart.addBodyPart(contentPart);

            // 遍历添加附件

            if (fileList != null && fileList.size() > 0) {

                for (File file : fileList) {

                    BodyPart attachmentBodyPart = new MimeBodyPart();

                    DataSource source = new FileDataSource(file);

                    attachmentBodyPart.setDataHandler(new DataHandler(source));

                    attachmentBodyPart.setFileName(file.getName());

                    multipart.addBodyPart(attachmentBodyPart);

                }

            }

            // 将多媒体对象放到message中

            message.setContent(multipart);

            // 保存邮件

            message.saveChanges();

            // SMTP验证，就是你用来发邮件的邮箱用户名密码

            transport = session.getTransport("smtp");

            transport.connect(mailHost, sender_username, sender_password);

            // 发送邮件

            transport.sendMessage(message, message.getAllRecipients());

            System.out.println(title + " Email send success!");

        } catch (Exception e) {

            logger.error(e);

        } finally {

            if (transport != null) {

                try {

                    transport.close();

                } catch (MessagingException e) {

                    logger.error(e);

                }

            }

        }

        return true;

    }

    /**

     * 测试main

     */

    public static void main(String[] args) {

        // 邮件主题

        String title = "邮件主题";

        // 邮件正文

        String htmlContent = "邮件内容";

        // 收件人

        List<String> receivers = new ArrayList<String>();

        receivers.add("收件人邮箱1");

        receivers.add("收件人邮箱2");

        // 附件

        String fileName1 = "附件路径1";

        File file1 = new File(fileName1);

        String fileName2 = "附件路径2";

        File file2 = new File(fileName2);

        List<File> fileList = new ArrayList<File>();

        fileList.add(file1);

        fileList.add(file2);

        // 执行发送

        new SendMail().sendEmail(title, htmlContent, receivers, fileList);

    }

}

package com.test;

import javax.mail.Authenticator;

import javax.mail.PasswordAuthentication;

/**

 * 通过账号密码进行身份验证

 */

public class MailAuthenticator extends Authenticator {

    private String userName;

    private String password;

    public String getUserName() {

        return userName;

    }

    public void setUserName(String userName) {

        this.userName = userName;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

    @Override

    protected PasswordAuthentication getPasswordAuthentication() {

        return new PasswordAuthentication(userName, password);

    }

    public MailAuthenticator(String username, String password) {

        this.userName = username;

        this.password = password;

    }

}