在Java世界，邮件相关功能主要经历了JavaMail > JavaMailSender > spring-boot-starter-mail这几个阶段，目前我们在Spring Boot项目中使用邮件服务已经变得非常简单了。
添加依赖
compile('org.springframework.boot:spring-boot-starter-mail')
application.yml中邮件服务相关配置
spring:
mail:
host: 邮件服务域
username: 账号
password: 密码
编写一个专门发送邮件的类MailHelper.kt
@Component
class MailHelper {
private val logger = LoggerFactory.getLogger(this.javaClass)
@Autowired
private lateinit var javaMailSender: JavaMailSender
@Value("\${spring.mail.username}")
private lateinit var from: String
/**
* 发送简单文本邮件
*/
fun sendSimpleMail(to: String, subject: String, content: String) {
val message = SimpleMailMessage()
message.setFrom(from)
message.setTo(to)
message.setSubject(subject)
message.setText(content)
javaMailSender.send(message)
}
/**
* 发送HTML格式邮件
*/
fun sendHtml(to: String, subject: String, content: String) {
val message = javaMailSender.createMimeMessage()
val helper = MimeMessageHelper(message, true)
helper.setFrom(from)
helper.setTo(to)
helper.setSubject(subject)
helper.setText(content, true)
javaMailSender.send(message)
}
/**
* 发送带附件的邮件（使用InputStream从内存中获取文件内容；如果是本地文件，可以考虑使用FileSystemResource）
*/
fun sendAttachments(to: String, subject: String, content: String, fileName: String, inputStream: InputStream) {
val message = javaMailSender.createMimeMessage()
val helper = MimeMessageHelper(message, true)
helper.setFrom(from)
helper.setTo(to)
helper.setSubject(subject)
helper.setText(content, true)
helper.addAttachment(fileName, ByteArrayResource(inputStream.readBytes()))
javaMailSender.send(message)
}
/**
* 发送带静态资源（一般为图片）的邮件
*/
fun sendInline(to: String, subject: String, content: String,contentId: String, inputStream: InputStream, contentType: String) {
val message = javaMailSender.createMimeMessage()
val helper = MimeMessageHelper(message, true)
helper.setFrom(from)
helper.setTo(to)
helper.setSubject(subject)
helper.setText(content, true)
helper.addInline(contentId, ByteArrayResource(inputStream.readBytes()), contentType)
javaMailSender.send(message)
}
}
在Spring项目中需要使用发送邮件功能的时候，注入上面的MailHelper，就可以使用了。
发送附件及图片的测试代码如下，使用了kotlin中的use函数自动关闭实现了Closeable接口的类对象，类似java中的try-with-resource，不过更为简洁方便。
@RunWith(SpringRunner::class)
@SpringBootTest
class ApplicationTests {
@Autowired
private lateinit var mailHelper: MailHelper
@Test
fun test1() {
val inputStream = File("/home/xxx/Desktop/93237012.pdf").inputStream()
inputStream.use {
mailHelper.sendAttachments("your.email@xx.xx", "附件邮件", "测试附件邮件", "测试文件.pdf", it)
}
}
@Test
fun test2() {
val cid = "123"
val content = "<html><body>测试图片邮件：<img src=\'cid:$cid\' ></body></html>"
val inputStream = File("/home/xxx/Desktop/123.png").inputStream()
inputStream.use {
mailHelper.sendInline("your.email@xxx@xx.xx", "图片邮件", content, cid, it, "image/png")
}
}
}
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