java 发送 mailemail 实践

package com.example.demo.utils; import lombok.extern.slf4j.Slf4j; import org.springframework.core.io.InputStreamSource; import org.springframework.mail.javamail.JavaMailSenderImpl; import org.springframework.mail.javamail.MimeMessageHelper; import javax.mail.MessagingException; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import java.io.File; import java.util.Properties; import java.util.concurrent.locks.ReentrantLock; @Slf4j public class MailSender { private static volatile JavaMailSenderImpl sender; private static ReentrantLock lock = new ReentrantLock(); private static void initServer() { JavaMailSenderImpl senderImpl = new JavaMailSenderImpl(); // 我用的 163 邮箱 senderImpl.setHost("smtp.163.com"); senderImpl.setPort(25); senderImpl.setUsername("你的邮箱"); senderImpl.setPassword("你的授权码"); Properties prop = new Properties(); prop.put("mail.smtp.auth", "true"); prop.put("mail.smtp.timeout", "25000"); prop.put("mail.smtp.ssl.enable", "false"); senderImpl.setJavaMailProperties(prop); senderImpl.setDefaultEncoding("UTF-8"); sender = senderImpl; } public static void sendHTML(String from, String[] recipients, String subject, String content) { try { sendAttachment(new InternetAddress(from), recipients, null, subject, null, null, content); } catch (MessagingException e) { log.error("发送邮件异常，e:{}", e); } } /** * 发邮件 * * @param from 发件人 * @param recipients 收件人 * @param cc 未知 * @param subject 邮件主题 * @param fileName 文件名称 * @param file 文件 * @param text 邮件正文 */ public static void sendAttachment(InternetAddress from, String[] recipients, String[] cc, String subject, String fileName, File file, String text) { initServer(); MimeMessage mimeMessage = sender.createMimeMessage(); MimeMessageHelper helper; try { helper = new MimeMessageHelper(mimeMessage, true, "UTF-8"); helper.setFrom(from); helper.setTo(recipients); if (cc != null && cc.length > 0) { helper.setCc(cc); } helper.setSubject(subject); if (fileName != null && file != null) { helper.addAttachment(fileName, file); } helper.setSubject(subject); helper.setText("", text); sender.send(mimeMessage); } catch (MessagingException e) { log.error("发送邮件异常，e:{}", e); } } /** * 带附件发送邮件 * * @param from 发件人 * @param recipients 收件人 * @param cc 未知 * @param subject 邮件主题 * @param fileName 附件文件名 * @param inputStreamSource 附件文件 * @param text 邮件正文 */ public static void sendAttachment2(InternetAddress from, String[] recipients, String[] cc, String subject, String fileName, InputStreamSource inputStreamSource, String text) { initServer(); MimeMessage mimeMessage = sender.createMimeMessage(); MimeMessageHelper helper; try { System.getProperties().setProperty("mail.mime.splitlongparameters", "false"); helper = new MimeMessageHelper(mimeMessage, true, "UTF-8"); helper.setFrom(from); helper.setTo(recipients); if (cc != null && cc.length > 0) { helper.setCc(cc); } helper.setSubject(subject); if (fileName != null) { helper.addAttachment(fileName, inputStreamSource); } helper.setText(text, true); sender.send(mimeMessage); } catch (Exception e) { log.error("发送邮件异常，e:{}", e); } } }