Java工具类：批量发送邮件（带附件）

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 2024/1/27 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 = "[e-mail]" ; // 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 = "[e-mail]" ; /** * 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("[e-mail]", "[e-mail]"), "我是标题", "我是内容", null); } }