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1. 登录Gmail

Gmail网址
点击右上角“小齿轮”，然后点击"查看所有设置"

点击“转发和 POP/IMAP”，按图中设置，然后点击保存：

2. 启用两步验证(https://myaccount.google.com/security)

登录上述网址，找到“安全”（Security）
点击“两步验证”

开启“两步验证”，小编这里已经开启了，所以显示的关闭.

3. 创建应用程序密码

搜索"App passwords"，点击第一个
输入程序名称，点击“创建”后会显示一个密码，该密码可以用来发送邮件.

4. Java程序实现（方式1）

4.1 导入依赖

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

4.2 yml配置

springmail:host: smtp.gmail.comport: 587username: [e-mail]: xxx # 第三步的应用程序密码properties:mail:smtp:auth: truestarttls:enable: truerequired: true

4.3 代码

import jakarta.mail.MessagingException;
import jakarta.mail.internet.MimeMessage;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;/*** 邮件发送服务实现类*/
@Slf4j
@RequiredArgsConstructor
@Service
public class MailSendService {@Value("${spring.mail.username}")private String mailFrom;private final JavaMailSender javaMailSender;@Overridepublic void sendMailSimple(String to, String subject, String text)  {SimpleMailMessage simpleMailMessage = new SimpleMailMessage();// 发件人simpleMailMessage.setFrom(mailFrom);// 收件人simpleMailMessage.setTo(to);// 邮件主题simpleMailMessage.setSubject(subject);// 邮件内容simpleMailMessage.setText(text);javaMailSender.send(simpleMailMessage);}@Overridepublic void sendWithAttach(String to, String subject, String text, MailAttachInfoDTO ...attachInfos) {MimeMessage message = javaMailSender.createMimeMessage();try{MimeMessageHelper helper = new MimeMessageHelper(message, true);helper.setFrom(mailFrom);helper.setTo(to);helper.setSubject(subject);helper.setText(text);for(MailAttachInfoDTO attachInfo : attachInfos) {if(attachInfo == null) continue;helper.addAttachment(attachInfo.getAttachName(), attachInfo.getAttachSource());}}catch (MessagingException e) {log.warn("MailSendServiceImpl.sendWithAttach failed.", e);}javaMailSender.send(message);}
}

4.4 设置代理

在调试的时候需要梯子，否则可能访问不了Gmail的服务器：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
import org.springframework.scheduling.annotation.EnableScheduling;@EnableScheduling
@EnableJpaAuditing
@SpringBootApplication
public class TestApplication {public static void main(String[] args) {// 设置代理地址、端口		你们调试的时候替换成自己的代理地址端口System.setProperty("http.proxyHost", "192.168.0.12");System.setProperty("http.proxyPort", "10183");SpringApplication.run(TestApplication.class, args);}}

5. Java程序实现（方式2-动态发送者）

由于我们项目中，原本已经存在发送邮件的功能，yml已经配置了其他的邮箱，而此时又来一个新需求，需要使用不同的邮箱来发送。所以这里我使用了动态设置发送人的方式。

DynamicMailSender.java

import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.JavaMailSenderImpl;import java.util.Properties;public class DynamicMailSender {public static JavaMailSender createGmailSender(String username, String password) {JavaMailSenderImpl mailSender = new JavaMailSenderImpl();mailSender.setHost("smtp.gmail.com");mailSender.setPort(587);mailSender.setUsername(username);mailSender.setPassword(password);Properties props = mailSender.getJavaMailProperties();props.put("mail.transport.protocol", "smtp");props.put("mail.smtp.auth", "true");props.put("mail.smtp.starttls.enable", "true");
//        props.put("mail.smtp.connectiontimeout", "5000");
//        props.put("mail.smtp.timeout", "5000");
//        props.put("mail.smtp.writetimeout", "5000");props.put("mail.debug", "true");return mailSender;}
}

EmailService.java

import jakarta.mail.internet.MimeMessage;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;@Slf4j
@Service
public class EmailService {/*** 发送Gmail邮件* @param from 发送者邮箱* @param password 应用程序密码* @param to 接收者邮箱* @param subject 邮件主题* @param text 邮件内容* @return 发送是否成功*/public boolean sendGmailSimple(String from, String password, String to, String subject, String text) {try {JavaMailSender mailSender = DynamicMailSender.createGmailSender(from, password);SimpleMailMessage message = new SimpleMailMessage();message.setFrom(from);message.setTo(to);message.setSubject(subject);message.setText(text);mailSender.send(message);return true;} catch (Exception e) {log.info("EmailService 发送gmail失败.", e);}return false;}/*** 发送Gmail邮件* @param fromEmail 发送者邮箱* @param fromName 发送者昵称* @param password 应用程序密码* @param to 接收者邮箱* @param subject 邮件主题* @param text 邮件内容* @return 发送是否成功*/public boolean sendGmailSimple(String fromEmail, String fromName, String password, String to, String subject, String text) {if (StringUtils.isBlank(fromName)) {return sendGmailSimple(fromEmail, password, to, subject, text);}return sendGmailSimple(fromEmail, fromName, password, to, subject, text, false);}/*** 发送Gmail邮件* @param fromEmail 发送者邮箱* @param fromName 发送者昵称* @param password 应用程序密码* @param to 接收者邮箱* @param subject 邮件主题* @param text 邮件内容* @param html 内容是否使用html格式* @return 发送是否成功*/public boolean sendGmailSimple(String fromEmail, String fromName, String password, String to, String subject, String text, boolean html) {try {JavaMailSender mailSender = DynamicMailSender.createGmailSender(fromEmail, password);MimeMessage message = mailSender.createMimeMessage();MimeMessageHelper helper = new MimeMessageHelper(message, true);helper.setFrom(fromEmail, fromName);helper.setTo(to);helper.setSubject(subject);helper.setText(text, html);mailSender.send(message);return true;} catch (Exception e) {log.info("EmailService 发送gmail失败.", e);}return false;}
}