如何在kotlin中发送带有文件附件的自定义电子邮件？

import java.util.*
import javax.mail.*
import javax.mail.internet.*

fun sendEmailWithAttachment(to: String, subject: String, body: String, attachmentPath: String) {
    val properties = Properties()
    properties["mail.smtp.host"] = "smtp.example.com" // 设置SMTP服务器地址
    properties["mail.smtp.port"] = "587" // 设置SMTP服务器端口号
    properties["mail.smtp.auth"] = "true" // 启用SMTP身份验证
    properties["mail.smtp.starttls.enable"] = "true" // 启用TLS加密

    val session = Session.getInstance(properties, object : Authenticator() {
        override fun getPasswordAuthentication(): PasswordAuthentication {
            return PasswordAuthentication("your-email@example.com", "your-password") // 设置发件人邮箱和密码
        }
    })

    try {
        val message = MimeMessage(session)
        message.setFrom(InternetAddress("your-email@example.com")) // 设置发件人邮箱
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to)) // 设置收件人邮箱
        message.subject = subject // 设置邮件主题

        val multipart = MimeMultipart()

        // 添加邮件正文
        val bodyPart = MimeBodyPart()
        bodyPart.setText(body)
        multipart.addBodyPart(bodyPart)

        // 添加文件附件
        val attachmentPart = MimeBodyPart()
        val dataSource = FileDataSource(attachmentPath)
        attachmentPart.dataHandler = DataHandler(dataSource)
        attachmentPart.fileName = dataSource.name
        multipart.addBodyPart(attachmentPart)

        message.setContent(multipart)

        Transport.send(message)
        println("邮件发送成功")
    } catch (e: MessagingException) {
        println("邮件发送失败: ${e.message}")
    }
}

fun main() {
    val to = "recipient@example.com" // 收件人邮箱
    val subject = "测试邮件" // 邮件主题
    val body = "这是一封测试邮件" // 邮件正文
    val attachmentPath = "path/to/attachment.pdf" // 附件文件路径

    sendEmailWithAttachment(to, subject, body, attachmentPath)
}

dependencies {
    implementation 'com.sun.mail:javax.mail:1.6.2'
    implementation 'com.sun.mail:javax.mail-api:1.6.2'
}