springBoot集成邮件服务发送邮件包含附件图片富文本或Thymeleaf模板发送邮件
在实际开发中，需要有很多地方用到关联邮件发送消息，比如注册成功信息，找回密码信息，或者通过邮件发送即将过期信息等等，所使用的应用场景很多很多，下面调用JavaMailSender发送邮件，
一、邮箱配置
首先需要我们注册邮箱，并开启二级密码设置，最主要的是开启邮箱的POP3/SMTP服务，这里以网易云邮箱举例，点击设置——POP3/SMTP/IMAP
并开启授权码，类似下图，这个授权码要牢记，后面会用到
1.配置完成，新建项目，在spirngBoot工程的pom.xml中导入邮件所需依赖及其他项目所需依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
2.配置application.properties
spring.mail.host=smtp.163.com spring.mail.username=xxxxxxxxxxx@163.com spring.mail.password=IPRWWISBDJIYVSYV spring.mail.properties.mail.smtp.auth=true spring.mail.properties.mail.smtp.starttls.enable=true spring.mail.properties.mail.smtp.starttls.required=true spring.mail.default-encoding=UTF-8
host qq邮箱为smtp.qq.com 网易邮箱为smtp.163.com
username为邮箱账号
password 特别注意这里password不代表邮箱的登录密码， 而是在刚开始生成的授权码
auth 开启权限验证
starttls.enable 是否开启加密通讯
starttls.required 是否必须开启加密通讯
3.新建邮件格式实体类，以自己内容为主 发送人，主题，内容
public class EmailBean implements Serializable {
private String[] receiver;
private String subject;
private String content;
public String[] getReceiver() {
return receiver;
}
public void setReceiver(String receiver) {
this.receiver = new String[] {receiver};
}
public void setReceiver(String... receiver) {
this.receiver = receiver;
}
..getter and setter
}
4.新建邮件发送工具类
（1）、纯文本格式邮件
@Component
public class EmailUtil {
@Value("${spring.mail.username}")
private String sender;
@Autowired
JavaMailSender javaMailSender;
public void sendPlainTextMail(EmailBean emailBean){
SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
simpleMailMessage.setFrom(sender);
simpleMailMessage.setTo(emailBean.getReceiver());
simpleMailMessage.setSubject(emailBean.getSubject());
simpleMailMessage.setText(emailBean.getContent());
javaMailSender.send(simpleMailMessage);
}
}
测试类调用
@Autowired
EmailUtil emailUtil;
@Test
public void sendMail(){
EmailBean emailBean = new EmailBean();
emailBean.setReceiver("xxxx@qq.com");
emailBean.setSubject("springBoot发送纯文本邮件测试");
emailBean.setContent("这是一段纯文本格式的邮件");
emailUtil.sendPlainTextMail(emailBean);
}
测试执行，最终执行结果
发送邮件给多人，当然这个可以用的地方不是很多，在实体类我们将接收者receiver设成数组格式，方便群发邮件
替换上一步emailBean.setReceiver()
@Test
public void sendMail(){
EmailBean emailBean = new EmailBean();
String[] arrReceivers = new String[] {"xxxxx1@qq.com", "xxxxx2@qq.com"};
emailBean.setReceiver(arrReceivers);
emailBean.setSubject("springBoot发送纯文本邮件测试");
emailBean.setContent("这是一段春纯文本格式的邮件，当前时间" + new Date());
emailUtil.sendPlainTextMail(emailBean);
logger.warn(String.format("发送邮件给%s成功", Arrays.toString(arrReceivers)));
}
结果
（2）发送带有HTML代码的邮件发送
可以看到我们使用的JavaMailSender继承了MailSender,发送纯文本格式的使用SimpleMailMessage
而发送带有附件信息或者富文本格式的邮件我们需要使用MimeMessage
在上一步EmailUtils.java里添加方法
public void sendMimeMail(EmailBean emailBean) throws MessagingException {
MimeMessage mimeMessage = javaMailSender.createMimeMessage();
MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);
mimeMessageHelper.setFrom(sender);
mimeMessageHelper.setTo(emailBean.getReceiver());
mimeMessageHelper.setSubject(emailBean.getSubject());
mimeMessageHelper.setText(emailBean.getContent(), true);
javaMailSender.send(mimeMessage);
}
进行测试
@Test
public void sendMimeEmail() throws MessagingException {
EmailBean emailBean = new EmailBean();
emailBean.setReceiver("xxxxxx@qq.com");
emailBean.setSubject("springBoot发送HTML格式邮件测试");
emailBean.setContent("<h1 style='color:red'>springBoot集成邮件发送html格式邮件测试</h1>");
emailUtil.sendMimeMail(emailBean);
logger.warn("发送邮件给成功");
}
（3）html中含有图片或者将图片以正文发送邮件
html代码中的图片需要在MimeMessageHelper中添加
public void sendMimeMail(EmailBean emailBean) throws MessagingException {
MimeMessage mimeMessage = javaMailSender.createMimeMessage();
MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);
mimeMessageHelper.setFrom(sender);
mimeMessageHelper.setTo(emailBean.getReceiver());
mimeMessageHelper.setSubject(emailBean.getSubject());
mimeMessageHelper.setText(emailBean.getContent(), true);
FileSystemResource fileSystemResource = new FileSystemResource(new File("C:\\Users\\ThinkPad\\Desktop\\image.png"));
mimeMessageHelper.addInline("image", fileSystemResource);
javaMailSender.send(mimeMessage);
}
这里mimeMessageHelper.addInline()中的参数表示获取资源的id和Resource
@Test
public void sendMimeEmail() throws MessagingException {
EmailBean emailBean = new EmailBean();
emailBean.setReceiver("xxxxxx@qq.com");
emailBean.setSubject("springBoot发送HTML包含图片邮件测试");
emailBean.setContent("<h5 style='color:red'>springBoot集成邮件发送html格式邮件测试</h5>" +
"<img src='cid:image");
emailUtil.sendMimeMail(emailBean);
logger.warn("发送邮件给成功");
}
点击测试
可以看到图片正常显示
（4）带有附件的邮件发送
在EmailUtil.java中添加方法
public void sendAppendMimeMail(EmailBean emailBean) throws MessagingException {
MimeMessage mimeMessage = javaMailSender.createMimeMessage();
MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);
mimeMessageHelper.setFrom(sender);
mimeMessageHelper.setTo(emailBean.getReceiver());
mimeMessageHelper.setSubject(emailBean.getSubject());
mimeMessageHelper.setText(emailBean.getContent(), true);
String filePath = "C:\\Users\\ThinkPad\\Desktop\\账号密码.xls";
FileSystemResource fileSystemResource = new FileSystemResource(new File(filePath));
mimeMessageHelper.addAttachment("11.xls", fileSystemResource);
javaMailSender.send(mimeMessage);
}
@Test
public void sendAppendMimeEmail() throws MessagingException {
EmailBean emailBean = new EmailBean();
emailBean.setReceiver("xxxxxx@qq.com");
emailBean.setSubject("springBoot集成邮件发送附件测试");
emailBean.setContent("<h1 style='color:red'>springBoot集成邮件发送html格式邮件及附件文件测试</h1>");
emailUtil.sendAppendMimeMail(emailBean);
logger.warn("含有附件邮件发送成功");
}
（5）使用Thymeleaf模板发送邮件
上一步我们用html代码发送邮件，就写了两行已经感觉比较麻烦了字符串的拼接和图片的上传，较复杂的内容邮件用这种方式会显得很麻烦，所有我们使用模板，需要改变的值用参数代替来达到个性化的邮件。
继续在pom.xml文件中导入Thymeleaf依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
z在templates文件夹下新建mailTemp.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body >
<div style="background-color:#222222;">
<img src="http://message-center-cbc-cn.obs.cn-north-1.myhuaweicloud.com/BSS/templateImg/2019411_zh_logo.png" />
</div>
<h4 th:text="|尊敬的华为云客户${username}|"></h4>
您好！
<p style="text-indent:2em">您的账户余额不足50.00元，为了保证您的业务正常运行，请及时进行<a href="https://cnblogs.com/LiuFqiang">充值</a></p>
<p style="text-indent:2em">感谢您对华为云的支持！</p>
<hr style="margin-left: initial;width: 100%; border:1px dashed #987cb9 ">
<p style="color: #999;font-size: 14px;margin-top:10px;margin-bottom:40px">
本邮件由系统自动发送，请勿直接回复！
</p>
<br >
<p>官方网站：<a href="https://cnblogs.com/LiuFqiang">https://cnblogs.com/LiuFqiang</a></p>
<p>Wechat：15641483049</p>
</body>
</html>
在测试类测试：
@Autowired
private TemplateEngine templateEngine;
@Test
public void sendHtmlEmail() throws MessagingException {
Context context = new Context();
context.setVariable("username", "刘**");
String emailContent = templateEngine.process("mailTemp", context);
EmailBean emailBean = new EmailBean();
emailBean.setReceiver("xxxxx@qq.com");
emailBean.setSubject("springBoot集成邮件服务");
emailBean.setContent(emailContent);
emailUtil.sendMimeMail(emailBean);
logger.warn("模板邮件发送成功！");
}
这里需要注意templateEmgine.process的模板路径名字一个要与template静态文件的相对应，并且模板的参数名与context.setVariable的一一对应
完结！！！
