java发送邮件email实战

1.首先在项目中增加依赖，在pom文件中添加如下坐标

    <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-mail</artifactId></dependency>

2.发邮件工具类如下

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);}}
}

3.发送邮件的服务端


import com.example.demo.utils.MailSender;
import lombok.extern.slf4j.Slf4j;
import org.springframework.mail.MailSendException;
import org.springframework.stereotype.Service;@Service
@Slf4j
public class MailService {private String mailText = "xxx发来邮件";private String mailer = "接收邮箱";public boolean sendMail() {boolean accept = false;try {MailSender.sendHTML("发送邮箱", new String[]{mailer}, mailText, "巴拉拉小魔仙");accept = true;} catch (MailSendException mailSendException) {log.info("邮件发送失败", mailSendException);// 是否需要重试} catch (Exception e) {log.error("邮件发送失败，收件人：{}", mailer, e);}return accept;}
}