JAVA Mail多抄送人有抄送内容亲测可用

      大周一的,上班没带耳机

pom文件依赖

<!--mail-->
<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.5.6</version>
</dependency>
<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>smtp</artifactId>
    <version>1.5.2</version>
    <type>jar</type>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>mailapi</artifactId>
    <version>1.5.2</version>
    <type>jar</type>
    <scope>compile</scope>
</dependency>

package com.ssm.boot.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

/**
 * Created by my on 2018/5/14.
 */
public class MailService {
    private static String defaultSenderName = "########";// 默认的发件人用户名，defaultEntity用得到
    private static String defaultSenderPass = "########";// 默认的发件人密码，defaultEntity用得到
    private static String defaultSmtpHost = "smtp.163.com";// 默认的邮件服务器地址，defaultEntity用得到

    private String smtpHost; // 邮件服务器地址
    private String sendUserName; // 发件人的用户名
    private String sendUserPass; // 发件人密码

    private MimeMessage mimeMsg; // 邮件对象
    private Session session;
    private Properties props;
    private Multipart mp;// 附件添加的组件
    private List<FileDataSource> files = new LinkedList<FileDataSource>();// 存放附件文件
    private void init() {
        if (props == null) {
            props = System.getProperties();
        }
        props.put("mail.smtp.host", smtpHost);
        props.put("mail.smtp.auth", "true"); // 需要身份验证
        session = Session.getDefaultInstance(props, null);
        // 置true可以在控制台（console)上看到发送邮件的过程
        session.setDebug(true);
        // 用session对象来创建并初始化邮件对象
        mimeMsg = new MimeMessage(session);
        // 生成附件组件的实例
        mp = new MimeMultipart();
    }

    private MailService(String smtpHost, String sendUserName, String sendUserPass, String to, String cc, String mailSubject, String mailBody,List<String> attachments) {
        this.smtpHost = smtpHost;
        this.sendUserName = sendUserName;
        this.sendUserPass = sendUserPass;

        init();
        setFrom(sendUserName);
        setTo(to);
        setCC(cc);
        setBody(mailBody);
        setSubject(mailSubject);
        if (attachments != null) {
            for (String attachment : attachments) {
                addFileAffix(attachment);
            }
        }

    }

    /**
     * 邮件实体
     *
     * @param smtpHost     邮件服务器地址
     * @param sendUserName 发件邮件地址
     * @param sendUserPass 发件邮箱密码
     * @param to           收件人，多个邮箱地址以半角逗号分隔
     * @param cc           抄送，多个邮箱地址以半角逗号分隔
     * @param mailSubject  邮件主题
     * @param mailBody     邮件正文
     * @param attachments  附件路径
     * @return
     */
    public static MailService entity(String smtpHost, String sendUserName, String sendUserPass, String to, String cc, String mailSubject, String mailBody,List<String> attachments) {
        return new MailService(smtpHost, sendUserName, sendUserPass, to, cc, mailSubject, mailBody, attachments);
    }

    /**
     * 默认邮件实体，用了默认的发送帐号和邮件服务器
     *
     * @param to      收件人，多个邮箱地址以半角逗号分隔
     * @param cc      抄送，多个邮箱地址以半角逗号分隔
     * @param subject 邮件主题
     * @param body    邮件正文
     *                附件全路径
     * @return
     */
    public static MailService defaultEntity(String to, String cc, String subject, String body, List<String> attachments) {
        return new MailService(defaultSmtpHost, defaultSenderName, defaultSenderPass, to, cc, subject, body, attachments);
    }

    /**
     * 设置邮件主题
     *
     * @param mailSubject
     * @return
     */
    private boolean setSubject(String mailSubject) {
        try {
            mimeMsg.setSubject(mailSubject);
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /**
     * 设置邮件内容,并设置其为文本格式或HTML文件格式，编码方式为UTF-8
     *
     * @param mailBody
     * @return
     */
    private boolean setBody(String mailBody) {
        try {
            BodyPart bp = new MimeBodyPart();
            bp.setContent("<meta http-equiv=Content-Type content=text/html; charset=UTF-8>" + mailBody, "text/html;charset=UTF-8");
            // 在组件上添加邮件文本
            mp.addBodyPart(bp);
        } catch (Exception e) {
            System.err.println("设置邮件正文时发生错误！" + e);
            return false;
        }
        return true;
    }

    /**
     * 添加一个附件
     *
     * @param filename 邮件附件的地址，只能是本机地址而不能是网络地址，否则抛出异常
     * @return
     */
    public boolean addFileAffix(String filename) {
        try {
            if (filename != null && filename.length() > 0) {
                BodyPart bp = new MimeBodyPart();
                FileDataSource fileds = new FileDataSource(filename);
                bp.setDataHandler(new DataHandler(fileds));
                bp.setFileName(MimeUtility.encodeText(fileds.getName(), "utf-8", null)); // 解决附件名称乱码
                mp.addBodyPart(bp);// 添加附件
                files.add(fileds);
            }
        } catch (Exception e) {
            System.err.println("增加邮件附件：" + filename + "发生错误！" + e);
            return false;
        }
        return true;
    }

    /**
     * 删除所有附件
     *
     * @return
     */
    public boolean delFileAffix() {
        try {
            FileDataSource fileds = null;
            for (Iterator<FileDataSource> it = files.iterator(); it.hasNext(); ) {
                fileds = it.next();
                if (fileds != null && fileds.getFile() != null) {
                    fileds.getFile().delete();
                }
            }
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /**
     * 设置发件人地址
     *
     * @param from 发件人地址
     * @return
     */
    private boolean setFrom(String from) {
        try {
            mimeMsg.setFrom(new InternetAddress(from));
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /**
     * 设置收件人地址
     *
     * @return
     */
    private boolean setTo(String to) {
        if (to == null)
            return false;
        try {
            mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /**
     * 设置抄送
     *
     * @param cc
     * @return
     */
    private boolean setCC(String cc) {
        if (cc == null) {
            return false;
        }
        try {
            mimeMsg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc));
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /**
     * 发送邮件
     *
     * @return
     */
    public boolean send() throws Exception {
        mimeMsg.setContent(mp);
        mimeMsg.saveChanges();
        System.out.println("正在发送邮件....");
        Transport transport = session.getTransport("smtp");
        // 连接邮件服务器并进行身份验证
        transport.connect(smtpHost, sendUserName, sendUserPass);
        // 发送邮件
        transport.sendMessage(mimeMsg, mimeMsg.getAllRecipients());
        System.out.println("发送邮件成功！");
        transport.close();
        return true;
    }


    public static void main(String[] args) {
        String userName = "##########"; // 发件人邮箱
        String password = "##########"; // 发件人密码
        String smtpHost = "smtp.163.com"; // 邮件服务器
        String to = "########"; // 收件人，多个收件人以半角逗号分隔
        String cc = "########,########"; // 抄送，多个抄送以半角逗号分隔
        String subject = "这是邮件的主题"; // 主题
        String body = "天上的星星参北斗啊"; // 正文,可以用html格式的哟
        List<String> attachments = Arrays.asList("D:\\A.png", "D:\\A.png"); // 附件的路径，多个附件也不怕
        MailService email = MailService.entity(smtpHost, userName, password, to, cc, subject, body, attachments);
        try {
            email.send(); // 发送！
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}