javaMail发送qq邮件(二)：可发送抄送密送多人，支持附件

关于javaMail发送邮件的详细教程可以看Java 发送邮件（菜鸟教程）本文的基础代码也来自这里。

关于实现的效果图如下

Snipaste_2020-03-25_18-05-06.png Snipaste_2020-03-25_18-06-44.png Snipaste_2020-03-25_18-09-25.png Snipaste_2020-03-25_18-12-12.png

在网上看到有说发送QQ邮箱需要添加SSL加密的代码

// 关于QQ邮箱，还要设置SSL加密，加上以下代码即可
MailSSLSocketFactory sf = new MailSSLSocketFactory();
sf.setTrustAllHosts(true);
props.put("mail.smtp.ssl.enable", "true");
props.put("mail.smtp.ssl.socketFactory", sf);

但在测试的时候发现不用开启SSL加密也能发送成功。

如何添加多个收件人

            InternetAddress[] addArr = null;
            // 设置收件人
            addArr = new InternetAddress[toList.size()];
            for (int i = 0; i < toList.size(); i++) {
                String mailtoString = (String) toList.get(i);
                addArr[i] = new InternetAddress(mailtoString);
            }
            message.setRecipients(Message.RecipientType.TO, addArr); // 设置收件人地址

抄送人和密送人类似，更改Message.RecipientType.TO为Message.RecipientType.CC（抄送）和Message.RecipientType.BCC（密送即可）

如何发送附件

需要在创建MimeMessage对象后

            // 创建默认的 MimeMessage 对象
            MimeMessage message = new MimeMessage(session);

设置消息体的文件数据
代码如下

                // 带有附件的邮件发送
                MimeMultipart multi = new MimeMultipart();
                BodyPart bodyPartText = new MimeBodyPart();
                bodyPartText.setText(messageContent); // 设置邮件内容
                multi.addBodyPart(bodyPartText);
                String fileName = null;
                for (int i = 0; i < fileList.size(); i++) {
                    fileName = (String) fileList.get(i);
                    FileDataSource fds = new FileDataSource(fileName);
                    
                    BodyPart fileBodyPart = new MimeBodyPart();
                    fileBodyPart.setDataHandler(new DataHandler(fds));  // 设置附件文件数据
                    
                    fileBodyPart.setFileName(fds.getName()); // 设置附件文件名称
                    multi.addBodyPart(fileBodyPart);
                }
                message.setContent(multi);

发送邮件的整体代码

import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.Properties;
import java.util.Vector;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
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;

/**
 * 发送邮件服务
 * 
 * @author lxh96
 *
 */
public class SendEmailService {
    private String mailServerPort = "25"; // 默认端口号

    /**
     * 发送邮件，验证用户权限
     * 
     * @param smtpHost       邮箱服务器
     * @param mailServerPort 邮箱服务器端口
     * @param mailFrom       发送方邮箱地址
     * @param toList         收件方邮箱集合
     * @param ccList         抄送邮箱地址集合
     * @param bbList         密送邮箱地址集合
     * @param subJect        邮件主题
     * @param messageStr     邮件内容
     * @param fileList       附件路径集合
     * @return
     * @throws UnsupportedEncodingException
     */
    public int authSend(String userName, String password, String smtpHost, String serverPort, String mailFrom,
            Vector<String> toList, Vector<String> ccList, Vector<String> bccList, String subJect, String messageContent, Vector fileList)
            throws UnsupportedEncodingException {
        // 获取系统属性
        Properties properties = System.getProperties();

        // 设置邮件服务器
        properties.setProperty("mail.smtp.host", smtpHost);
        // 设置端口
        properties.setProperty("mail.smtp.port", mailServerPort);
        // 设置邮箱是否需要验证
        properties.setProperty("mail.smtp.auth", "true");

        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties, new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(userName, password); // qq邮箱用户名 密码（qq为授权码） --用于登录邮箱服务器的用户名密码
            }
        });

        session.setDebug(false); // 是否开启debug模式，用于调试
        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(mailFrom, "nickName")); // 发件人名称可以不设置

            InternetAddress[] addArr = null;
            // 设置收件人
            addArr = new InternetAddress[toList.size()];
            for (int i = 0; i < toList.size(); i++) {
                String mailtoString = (String) toList.get(i);
                addArr[i] = new InternetAddress(mailtoString);
            }
            message.setRecipients(Message.RecipientType.TO, addArr); // 设置收件人地址

            // 设置抄送人地址
            if ((ccList != null) && (ccList.size() != 0)) {
                addArr = new InternetAddress[ccList.size()];
                for (int i = 0; i < ccList.size(); i++) {
                    String ccMailStr = (String) ccList.get(i);
                    addArr[i] = new InternetAddress(ccMailStr);
                }
                message.setRecipients(Message.RecipientType.CC, addArr); // 设置抄送人地址
            }

            // 设置密送人地址
            if ((bccList != null) && (bccList.size() != 0)) {
                addArr = new InternetAddress[bccList.size()];
                for (int i = 0; i < bccList.size(); i++) {
                    String bccMailStr = (String) bccList.get(i);
                    addArr[i] = new InternetAddress(bccMailStr);
                }
                message.setRecipients(Message.RecipientType.BCC, addArr); // 设置密送人地址
            }
            // Set Subject: 头部头字段
            message.setSubject(subJect);
            if ((fileList == null) || (fileList.size() == 0)) { // 没有附件
                // 设置消息体
                message.setText(messageContent);
            } else {
                // 带有附件的邮件发送
                MimeMultipart multi = new MimeMultipart();
                BodyPart bodyPartText = new MimeBodyPart();
                bodyPartText.setText(messageContent); // 设置邮件内容
                multi.addBodyPart(bodyPartText);
                String fileName = null;
                for (int i = 0; i < fileList.size(); i++) {
                    fileName = (String) fileList.get(i);
                    FileDataSource fds = new FileDataSource(fileName);
                    
                    BodyPart fileBodyPart = new MimeBodyPart();
                    fileBodyPart.setDataHandler(new DataHandler(fds));  // 设置附件文件数据
                    
                    fileBodyPart.setFileName(fds.getName()); // 设置附件文件名称
                    multi.addBodyPart(fileBodyPart);
                }
                message.setContent(multi);
                
            }

            message.setSentDate(new Date()); // 邮件邮件发送时间
            message.saveChanges();
            
            long btime = System.currentTimeMillis();
            // 发送消息
            Transport.send(message);
            
            long etime = System.currentTimeMillis();
            
            String sendmessage = "发件人："+mailFrom+"发送成功\n收件人:"+toList+"\n";
            if (ccList != null && ccList.size() != 0) {
                sendmessage += "抄送人："+ccList+"\n";
            }
            if (bccList != null && bccList.size() != 0) {
                sendmessage += "密送人："+bccList+"\n";
            }
            sendmessage += "用时："+(etime - btime)+"ms";
            System.out.println("Sent message successfully....\n"+sendmessage);
        } catch (MessagingException mex) {
            mex.printStackTrace();
            return 1;
        }
        return 0;
    }

    public void setMailServerPort(String mailServerPort) {
        this.mailServerPort = mailServerPort;
    }
}

测试类

import java.io.UnsupportedEncodingException;
import java.util.Vector;

import mail.service.SendEmailService;

/**
 * 发送邮件测试
 * 
 * @author lxh96
 *
 */
public class SendEmail {
    public static void main(String[] args) {
        SendEmailService sendEmail = new SendEmailService();
        String userName = "34**9@qq.com";
        String password = "QQ邮箱授权码或者其他登陆邮箱密码";
        String smtpHost = "smtp.qq.com";
        String serverPort = "465";
        String mailFrom = "34**9@qq.com";
        Vector<String> toList = new Vector<String>() ;
        toList.addElement("*****4@163.com");
        toList.addElement("56***7@qq.com");
        Vector<String> ccList = new Vector<String>();
        ccList.addElement("56**7@qq.com");
        Vector<String> bccList = new Vector<String>();
        bccList.addElement("*****@163.com");
        String subJect = "hello 测试";
        String messageContent = "hello ,我是一个javamail的测试邮件";
        Vector<String> fileList = new Vector<String>();
        fileList.addElement("C:\\Users\\lxh96\\Pictures\\B01.jpg");
        fileList.addElement("C:\\Users\\lxh96\\Pictures\\unnamed.jpg");
        try {
            sendEmail.authSend(userName, password, smtpHost, serverPort, mailFrom, toList, ccList, bccList, subJect,
                    messageContent, fileList);
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("邮件发送失败");
        }
    }
}

能够实现简单邮件多人发送、多人抄送、密送和多附件的发送功能。可能需要根据不同的邮件发送服务器修改或添加相应的properties配置，但应该大同小异。