1、在 pom.xml 文件中引入邮件配置：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>2、配置文件（这是发送者账号密码）
spring.mail.host=smtp.exmail.qq.com
spring.mail.username=jyx@qq.com
spring.mail.password=111111
spring.mail.from=jyx@qq.com3、发送
（1）简单文本邮件
@RunWith(SpringRunner.class)
@SpringBootTest
@ActiveProfiles("163")
public class EmailTest {
@Autowired
private JavaMailSender mailSender; //自动注入的Bean
@Value("${spring.mail.username}")
private String Sender; //读取配置文件中的参数
@Test
public void sendSimpleMail() throws Exception {
SimpleMailMessage message = new SimpleMailMessage();
message.setFrom(Sender);
message.setTo("[email protected]"); //接收者邮箱
message.setSubject("主题：简单邮件");
message.setText("测试邮件内容");
mailSender.send(message);
}
}（2）发送Html邮件
@Test
public void sendHtmlMail() {
MimeMessage message = null;
try {
message = mailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(message, true);
helper.setFrom(Sender);
helper.setTo(Sender);
helper.setSubject("标题：发送Html内容");
StringBuffer sb = new StringBuffer();
sb.append("<h1>大标题-h1</h1>")
.append("<p style='color:#F00'>红色字</p>")
.append("<p style='text-align:right'>右对齐</p>");
helper.setText(sb.toString(), true);
} catch (Exception e) {
e.printStackTrace();
}
mailSender.send(message);
}（3）发送带附件的邮件
@Test
public void sendAttachmentsMail() {
MimeMessage message = null;
try {
message = mailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(message, true);
helper.setFrom(Sender);
helper.setTo(Sender);
helper.setSubject("主题：带附件的邮件");
helper.setText("带附件的邮件内容");
//注意项目路径问题，自动补用项目路径
FileSystemResource file = new FileSystemResource(new File("src/main/resources/static/image/picture.jpg"));
//加入邮件
helper.addAttachment("图片.jpg", file);
} catch (Exception e){
e.printStackTrace();
}
mailSender.send(message);
}（4）发送带静态资源的邮件
@Test
public void sendInlineMail() {
MimeMessage message = null;
try {
message = mailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(message, true);
helper.setFrom(Sender);
helper.setTo(Sender);
helper.setSubject("主题：带静态资源的邮件");
//第二个参数指定发送的是HTML格式,同时cid:是固定的写法
helper.setText("<html><body>带静态资源的邮件内容 图片:<img src='cid:picture' /></body></html>", true);
FileSystemResource file = new FileSystemResource(new File("src/main/resources/static/image/picture.jpg"));
helper.addInline("picture",file);
} catch (Exception e){
e.printStackTrace();
}
mailSender.send(message);
}（5）发送模板邮件
在Spring Boot中也能使用模板引擎来实现模板化的邮件发送。关于模板邮件，SpringBoot 原本是支持 velocity，在 1.4 版本后又抛弃了 velocity，暂时只支持 freemaker。
引入 freemaker 依赖:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency> @Autowired
private FreeMarkerConfigurer freeMarkerConfigurer; //自动注入
@Test
public void sendTemplateMail(){
MimeMessage message = null;
try {
message = mailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(message, true);
helper.setFrom(Sender);
helper.setTo(Sender);
helper.setSubject("主题：模板邮件");
Map<String, Object> model = new HashedMap();
model.put("username", "zggdczfr");
//修改 application.properties 文件中的读取路径
// FreeMarkerConfigurer configurer = new FreeMarkerConfigurer();
// configurer.setTemplateLoaderPath("classpath:templates");
//读取 html 模板
Template template = freeMarkerConfigurer.getConfiguration().getTemplate("mail.html");
String html = FreeMarkerTemplateUtils.processTemplateIntoString(template, model);
helper.setText(html, true);
} catch (Exception e) {
e.printStackTrace();
}
mailSender.send(message);
}