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缘由：

在学习Java的过程中不断用文章进行整理总结（常用功能的Java实现），争取早日能较为熟练的使用Java进行开发。

正文：

参考解答：

package com.ixyzero.learn.misc;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.UnsupportedEncodingException;
import java.util.Properties;

public class EmailManager {

    public static String senderNick = "nickName";   // 发件人昵称
    public static String username = "[email protected]"; // 发送邮箱帐号
    public static String password = "password"; // 发送邮箱密码
    public static String host = "smtp.qq.com"; // 主机
    public static String port = "465"; // 端口

    private Properties props; // 系统属性
    private Session session; // 邮件会话对象
    private MimeMessage mimeMsg; // MIME邮件对象
    private Multipart mp;   // Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成MimeMessage对象

    private static EmailManager instance = null;

    public EmailManager() {
        props = System.getProperties();
        props.put("mail.smtp.auth", "true");
        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", port);
        props.put("username", username);
        props.put("password", password);
        // 建立会话
        session = Session.getDefaultInstance(props);
        session.setDebug(false);
    }

    public static EmailManager getInstance() {
        if (instance == null) {
            instance = new EmailManager();
        }
        return instance;
    }

    /**
     * 发送邮件
     * @param from 发件人
     * @param to 收件人
     * @param copyto 抄送
     * @param bcopyto 密送
     * @param subject 主题
     * @param content 内容
     * @param fileList 附件列表
     * @return
     */
    public boolean sendMail(String from, String[] to, String[] copyto, String[] bcopyto, String subject, String content, String[] fileList) {
        boolean success = true;
        try {
            mimeMsg = new MimeMessage(session);
            mp = new MimeMultipart();

            // 自定义发件人昵称
            String nick = "";
            try {
                nick = javax.mail.internet.MimeUtility.encodeText(senderNick);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            // 设置发件人
            // mimeMsg.setFrom(new InternetAddress(from));
            mimeMsg.setFrom(new InternetAddress(from, nick));
            // 设置收件人
            if (to != null && to.length > 0) {
                String toListStr = getMailList(to);
                mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toListStr));
            }
            // 设置抄送人
            if (copyto != null && copyto.length > 0) {
                String ccListStr = getMailList(copyto);
                mimeMsg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(ccListStr));
            }
            // 设置密送人
            if (bcopyto != null && bcopyto.length > 0) {
                String bccListStr = getMailList(bcopyto);
                mimeMsg.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(bccListStr));
            }
            // 设置主题
            mimeMsg.setSubject(subject);
            // 设置正文
            BodyPart bp = new MimeBodyPart();
            bp.setContent(content, "text/html;charset=utf-8");
            mp.addBodyPart(bp);
            // 设置附件
            if (fileList != null && fileList.length > 0) {
                for (int i = 0; i < fileList.length; i++) {
                    bp = new MimeBodyPart();
                    FileDataSource fds = new FileDataSource(fileList[i]);
                    bp.setDataHandler(new DataHandler(fds));
                    bp.setFileName(MimeUtility.encodeText(fds.getName(), "UTF-8", "B"));
                    mp.addBodyPart(bp);
                }
            }
            mimeMsg.setContent(mp);
            mimeMsg.saveChanges();
            // 发送邮件
            if (props.get("mail.smtp.auth").equals("true")) {
                Transport transport = session.getTransport("smtp");
                transport.connect((String)props.get("mail.smtp.host"), (String)props.get("username"), (String)props.get("password"));
                transport.sendMessage(mimeMsg, mimeMsg.getAllRecipients());
                transport.close();
            } else {
                Transport.send(mimeMsg);
            }
            System.out.println("邮件发送成功");
        } catch (MessagingException e) {
            e.printStackTrace();
            success = false;
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            success = false;
        }
        return success;
    }

    /**
     * 发送邮件
     * @param from 发件人
     * @param to 收件人, 多个Email以英文逗号分隔
     * @param cc 抄送, 多个Email以英文逗号分隔
     * @param bcc 密送, 多个Email以英文逗号分隔
     * @param subject 主题
     * @param content 内容
     * @param fileList 附件列表
     * @return
     */
    public boolean sendMail(String from, String to, String cc, String bcc, String subject, String content, String[] fileList) {
        boolean success = true;
        try {
            mimeMsg = new MimeMessage(session);
            mp = new MimeMultipart();

            // 自定义发件人昵称
            String nick = "";
            try {
                nick = javax.mail.internet.MimeUtility.encodeText(senderNick);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            // 设置发件人
//          mimeMsg.setFrom(new InternetAddress(from));
            mimeMsg.setFrom(new InternetAddress(from, nick));
            // 设置收件人
            if (to != null && to.length() > 0) {
                mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
            }
            // 设置抄送人
            if (cc != null && cc.length() > 0) {
                mimeMsg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc));
            }
            // 设置密送人
            if (bcc != null && bcc.length() > 0) {
                mimeMsg.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(bcc));
            }
            // 设置主题
            mimeMsg.setSubject(subject);
            // 设置正文
            BodyPart bp = new MimeBodyPart();
            bp.setContent(content, "text/html;charset=utf-8");
            mp.addBodyPart(bp);
            // 设置附件
            if (fileList != null && fileList.length > 0) {
                for (int i = 0; i < fileList.length; i++) {
                    bp = new MimeBodyPart();
                    FileDataSource fds = new FileDataSource(fileList[i]);
                    bp.setDataHandler(new DataHandler(fds));
                    bp.setFileName(MimeUtility.encodeText(fds.getName(), "UTF-8", "B"));
                    mp.addBodyPart(bp);
                }
            }
            mimeMsg.setContent(mp);
            mimeMsg.saveChanges();
            // 发送邮件
            if (props.get("mail.smtp.auth").equals("true")) {
                Transport transport = session.getTransport("smtp");
                transport.connect((String)props.get("mail.smtp.host"), (String)props.get("username"), (String)props.get("password"));
                transport.sendMessage(mimeMsg, mimeMsg.getAllRecipients());
                transport.close();
            } else {
                Transport.send(mimeMsg);
            }
            System.out.println("邮件发送成功");
        } catch (MessagingException e) {
            e.printStackTrace();
            success = false;
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            success = false;
        }
        return success;
    }

    public String getMailList(String[] mailArray) {
        StringBuffer toList = new StringBuffer();
        int length = mailArray.length;
        if (mailArray != null && length < 2) {
            toList.append(mailArray[0]);
        } else {
            for (int i = 0; i < length; i++) {
                toList.append(mailArray[i]);
                if (i != (length - 1)) {
                    toList.append(",");
                }

            }
        }
        return toList.toString();
    }

    public static void main(String[] args) {
        String from = username;
        String[] to = {"收件人地址"};
        String[] copyto = {"抄送人地址1", "抄送人地址2"};
        String[] bcopyto = {"密送人地址"};
        String subject = "测试一下";
        String content = "这是邮件内容，仅仅用作测试，不需要回复。";
        String[] fileList = null;
        // String[] fileList = new String[3];
        // fileList[0] = "/path/to/file";
        // fileList[1] = "/path/to/file2";
        // fileList[2] = "/path/to/file3";
        EmailManager.getInstance().sendMail(from, to, copyto, bcopyto, subject, content, fileList);
    }
}

/*
* 这里的邮件发送原理是 transport.connect() 之后再 transport.sendMessage() 不清楚对于 QQ邮箱那种这样支不支持，待测试。
*   Transport transport = session.getTransport("smtp");
    transport.connect(host, username, password);
*/

参考链接：

• Java 发送邮件
• java实现邮件发送， 抄送及多附件发送 #nice
• Java发送邮件的几种方式
• JavaWeb学习总结(五十二)——使用JavaMail创建邮件和发送邮件
• 基于JavaMail的Java邮件发送：简单邮件发送
  基于JavaMail的Java邮件发送：复杂邮件发送
• Java发送邮件示例

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