java利用网易邮箱批量发送邮件（带附件）

阳光穿透心脏的1/2处 2021-12-21 08:01 819阅读 0赞

# 前言 #

来个需求，需要给注册用户发送特定的邮件内容，所以就有了这篇博文咯。

# 准备条件（本文以网易邮箱为例） #

**邮箱账号必须要开启 SMTP 服务**

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**设置授权码**

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# 编码实现 #

**maven**

<dependency>
        <groupId>com.sun.mail</groupId>
        <artifactId>javax.mail</artifactId>
    	<version>1.4.7</version>
    </dependency>

EmailUtil

import javax.mail.*;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeMessage;
    import java.util.Arrays;
    import java.util.Date;
    import java.util.List;
    import java.util.Properties;
    
    /**
     * @Author 954
     * @create 2019/6/27 13:46
     */
    public class EmailUtil {
    
        // 发送者别名
        private static final String SENDER_NAME = "XXX" ;
    
        // 发送邮箱地址
        private static final String SENDER_ADDRESS = "XXX@163.com" ;
    
        // 发送邮箱的授权码
        private static final String SENDER_PWD = "XXX" ;
    
        // 密送的邮箱地址
        private static final String PRIVATE_ADDRESS = "XXX@163.com" ;
    
        /**
         * 发送邮件的环境对象
         */
        private static final Session EMAIL_SESSION = getEmailSession();
    
        /**
         * 批量发送电子邮件
         * @param emailAddressList  邮箱地址
         * @param content           邮件内容
         * @param title             邮件标题
         * @param fileList          附件
         * @throws Exception
         */
        public synchronized void sendEmail(List<String> emailAddressList, String title, String content, List<File> fileList) throws Exception {
            MimeMessage mimeMessage = getMimeMessage(emailAddressList, title, content);
            if (!CollectionUtils.isEmpty(fileList)){
                // 处理附件
                Multipart multipart = getMultipart(fileList);
                mimeMessage.setContent(multipart);
                //  添加邮件内容
                BodyPart contentPart = new MimeBodyPart();
                contentPart.setContent(content, "text/html;charset=UTF-8");
                // 将multipart对象放入message中
                multipart.addBodyPart(contentPart);
            }
            Transport.send(mimeMessage);
        }
    
        private MimeMessage getMimeMessage(List<String> emailAddressList, String title, String content) throws Exception {
            // 创建邮件消息
            MimeMessage message = new MimeMessage(EMAIL_SESSION);
            // 设置发件人
            message.setFrom(new InternetAddress(SENDER_ADDRESS, SENDER_NAME));
            // 设置收件人
            InternetAddress[] address = new InternetAddress[emailAddressList.size()] ;
            for (int i = 0; i < emailAddressList.size(); i++){
                address[i] = new InternetAddress(emailAddressList.get(i)) ;
            }
            message.setRecipients(Message.RecipientType.TO, address);
            // 设置密送
            message.setRecipient(Message.RecipientType.BCC, new InternetAddress(PRIVATE_ADDRESS));
            // 设置邮件标题
            message.setSubject(title, "UTF-8");
            // 设置邮件的内容体
            message.setContent(content, "text/html;charset=UTF-8");
            // 设置发送时间
            message.setSentDate(new Date());
            return message;
        }
    
        private Multipart getMultipart(List<File> fileList) {
            if (CollectionUtils.isEmpty(fileList)) return null;
            Multipart multipart = new MimeMultipart();
            // 添加附件的内容
            fileList.stream().parallel().forEach(file -> {
                try {
                    BodyPart attachmentBodyPart = new MimeBodyPart();
                    DataSource source = new FileDataSource(file);
                    attachmentBodyPart.setDataHandler(new DataHandler(source));
                    // MimeUtility.encodeWord可以避免文件名乱码
                    attachmentBodyPart.setFileName(MimeUtility.encodeWord(file.getName()));
                    multipart.addBodyPart(attachmentBodyPart);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
            return multipart ;
        }
    
        private static Session getEmailSession(){
            // 配置发送邮件的环境属性
            Properties props = new Properties();
            //设置用户的认证方式
            props.setProperty("mail.smtp.auth", "true");
            //设置传输协议
            props.setProperty("mail.transport.protocol", "smtp");
            //设置发件人的SMTP服务器地址
            props.setProperty("mail.smtp.host", "smtp.163.com");
            // 构建授权信息，用于进行SMTP进行身份验证
            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                // 用户名、密码
                return new PasswordAuthentication(SENDER_ADDRESS, SENDER_PWD);
                }
            };
            return Session.getInstance(props, authenticator);
        }
    
        public static void main(String[] args) throws Exception {
            sendEmail(Arrays.asList("XXX@qq.com", "XXX@163.com"), "我是标题", "我是内容", null);
        }
    
    }

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