1.准备工作
使用spring boot发送邮件，需要做一个准备工作，必须打开发送邮件的服务。这里以qq为例，到邮箱设置–> 账户设置–> 找到pop3/smpt服务，点击开启，根据提示，发送短信到官方申请开启，最后会获得一个授权码，这是我们下面需要的。
2.配置文件：application.yml
spring
mail:
host: smtp.qq.com
password: ****** # 刚才申请的授权码
username: ****** # 你的qq邮箱
protocol: smtp
test-connection: true
default-encoding: utf-8
properties:
mail:
smtp:
auth: true # 认证
ssl:
enable: true # SSL
starttls: # TLS需要时
enable: true
required: true 3.邮件工具类
@Component
public class MailUtil {
private static final Logger LOGGER = LoggerFactory.getLogger(MailUtil.class);
@Value("${spring.mail.username}")
public String fromUser;
@Autowired
private JavaMailSender javaMailSender;
/**
* 普通邮件发送
* @param email
* @throws Exception
*/ public void sendEmail(Email email) throws Exception {
LOGGER.info("发送普通邮件给：{}",email.getToEmail());
SimpleMailMessage message = new SimpleMailMessage();
message.setFrom(fromUser);
message.setTo(email.getToEmail());
message.setSubject(email.getSubject());
message.setText(email.getContent());
javaMailSender.send(message);
}
/**
* 带图片发送
* @param email
*/ public void sendPicture(Email email) throws Exception {
LOGGER.info("发送带图片邮件给：{}",email.getToEmail());
MimeMessage message = javaMailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(message, true);
//这里可以自定义发信名称比如：setFrom(fromUser,'gq')
helper.setFrom(fromUser);
helper.setTo(email.getToEmail());
helper.setSubject(email.getSubject());
helper.setText("<html><body><img src="cid:pic" ></body></html>",true);
FileSystemResource file = new FileSystemResource(new File(email.getFilePath()));
//pic 名称需与 cid 那里的名称对应
helper.addInline("pic", file);
javaMailSender.send(message);
}
/**
* 发送html，如 链接
* @param email
*/ public void sendHtml(Email email) throws Exception {
LOGGER.info("发送带图片邮件给：{}",email.getToEmail());
MimeMessage message = javaMailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(message, true);
helper.setFrom(fromUser);
helper.setTo(email.getToEmail());
helper.setSubject(email.getSubject());
helper.setText(email.getContent(),true);
javaMailSender.send(message);
}
/**
* 发送附件
* @param email
* @throws Exception
*/ public void sendWithAttachments(Email email) throws Exception {
LOGGER.info("发送带附件邮件给：{}",email.getToEmail());
MimeMessage message = javaMailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(message, true,"UTF-8");
helper.setFrom(fromUser);
helper.setTo(email.getToEmail());
helper.setSubject(email.getSubject());
helper.setText(email.getContent());
//FileSystemResource file = new FileSystemResource(new File(email.getFilePath()));
File file = new File(email.getFilePath());
String fileName = email.getFilePath().substring(email.getFilePath().lastIndexOf(File.separator));
fileName = MimeUtility.encodeWord(fileName,"UTF-8","B");
//发送多个
helper.addAttachment(fileName,file);
javaMailSender.send(message);
}
} 这个工具类的方法只是发送单一内容，复杂的内容，如 图片，附件，文字等，大家可以根据单一的自己去补充下，做个练手。
4.测试用例
@Test
void contextLoads() throws Exception {
/* 发送纯文本
Email email = new Email()
.setToEmail(new String[]{"133******@qq.com"})
.setSubject("测试邮件发送")
.setContent("hello，成功的发送了邮件");
mailUtil.sendEmail(email);*/
/*发送模板邮件
Email email = new Email()
.setToEmail(new String[]{"133******@qq.com"})
.setSubject("测试模板邮件发送");
Context context = new Context();
context.setVariable("title","模板发送");
context.setVariable("content","lalala");
String process = templateEngine.process("emailTpl/emailTpl", context);
email.setContent(process);
mailUtil.sendEmail(email);*/
/*
Email email = new Email()
.setToEmail(new String[]{"133******@qq.com"})
.setSubject("测试邮件发送图片")
.setFilePath("C:UsersGQPicturesCamera Roll壁纸2.jpg");
mailUtil.sendPicture(email);*/
Email email = new Email()
.setToEmail(new String[]{"133******@qq.com"})
.setSubject("测试邮件发送附件")
.setContent("你好，欢迎查阅附件")
.setFilePath("C:UsersGQDownloads9月竣工时间表.xls");
mailUtil.sendWithAttachments(email);
} 结果如下图：
纯文本邮件
发送图片
附件
5.小结
ok，今天的一个小demo就到这里了，大家不妨动手试下。不过要注意里面的细节，比如发送图片的cid等等，一不小心就弄错了。刚刚小编就在发送附件这里出错了，截取文件名的时候写成了(0,length)这种。好了，喜欢小编的朋友可以点个关注哦[呲牙][呲牙][呲牙]
