java - 在 groovy 中发送邮件

Question

我已经在我的程序中编写了这段代码，当我在附件中传递文件路径时它成功发送了邮件(例如:attachment = "/home/Aman/file.txt")* 但它在发送邮件时抛出 IOException 当我不需要附加任何文件时。* 我已经尝试在 messageBodyPart.attachFile(attachment) 之前应用条件但是它也抛出相同的异常。

def sendMail(String message, String attachment, String subject) {
    Properties properties = System.getProperties()
    properties.setProperty("mail.smtp.host", eMailSMTPHost)
    properties.setProperty("mail.smtp.port", eMailSMTPIPPort)
    Session session = Session.getDefaultInstance(properties)
    try{
        // Create a default MimeMessage object.
        MimeMessage msg = new MimeMessage(session)
        msg.setFrom(new InternetAddress(eMailSendFrom))
        eMailSendTo.split(',').each(){ item ->      msg.addRecipient(Message.RecipientType.TO,
            new InternetAddress(item)    )
        }
        eMailSendCc.split(',').each(){ item -> msg.addRecipient(Message.RecipientType.CC,
            new InternetAddress(item)    )
        }
        msg.setSubject(subject)
        BodyPart messageBodyPart = new MimeBodyPart()
        messageBodyPart.setContent(message,"text/html")
        Multipart multipart = new MimeMultipart()
        multipart.addBodyPart(messageBodyPart)

        messageBodyPart = new MimeBodyPart()
        messageBodyPart.attachFile(attachment)  
        multipart.addBodyPart(messageBodyPart)

        // Send the complete message parts
        msg.setContent(multipart)
        Transport.send(msg)     
        System.exit(0)
    } catch(RuntimeException e) {
        println e.getMessage()
    }
}

Answer 1

if(!attachment.equals("") && !attachment.isEmpty()) {
        BodyPart messageBodyPart = new MimeBodyPart()
        messageBodyPart.setContent(message,"text/html")
        Multipart multipart = new MimeMultipart()
        multipart.addBodyPart(messageBodyPart)

        messageBodyPart = new MimeBodyPart()
        messageBodyPart.attachFile(attachment)
        multipart.addBodyPart(messageBodyPart)              
        // Send the complete message parts
        msg.setContent(multipart)
    } 
    else {
        msg.setContent(message, "text/html")
    }

在代码片段中进行上述更改。它会起作用的。。
由于 messageBodyPart.attachFile(attachment) 总是尝试访问该文件，因此，如果您不提供任何附件或任何无效文件作为附件，那么它将尝试访问不可用的文件并抛出IO异常。