通过邮件java

问题描述

在这里,它工作得很好,但是我没有使用收到的文件,而是使用了文件路径 我怎样才能做到这一点 我虽然将其转换为输入流会很好,但是输入流没有构造函数 请告诉我 预先感谢

@RequestMapping("/SendMail")
    public String mail(@RequestParam("prescription") multipartfile prescription,@RequestParam("email") String email,HttpSession session) {
        try {
            customer ct=custServ.customerExists(email);
            InputStream in = prescription.getInputStream();
            String filename=prescription.getName();
            if(ct!=null){
                final String SEmail="[email protected]";
                final String SPass="passowrd";
                final String REmail=email;
                final String Sub="Your prescription is here!";
                //mail send Code
            Properties props=new Properties();
            props.put("mail.smtp.host","smtp.gmail.com");
            props.put("mail.smtp.socketFactory.port","465");
            props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
            props.put("mail.smtp.auth","true");
            props.put("mail.smtp.port","465");
            Session ses=Session.getInstance(props,new javax.mail.Authenticator() {
                protected PasswordAuthentication getpasswordAuthentication(){
                    return new PasswordAuthentication(SEmail,SPass);
                }
            }
            );
            Message message=new MimeMessage(ses);
            message.setFrom(new InternetAddress(SEmail));
            message.setRecipients(Message.RecipientType.TO,InternetAddress.parse(REmail));
            message.setSubject(Sub);
            
            BodyPart messageBodyPart = new MimeBodyPart();
             messageBodyPart.setText("This is your prescription here");
             Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(messageBodyPart);
            messageBodyPart = new MimeBodyPart(); 
            
           // File filep=new File(prescription);
            DataSource source = new FileDataSource("C:\\Users\\Narci\\Desktop\\frontend\\Myqr3.jpg");
            messageBodyPart.setDataHandler(new DataHandler(source));
            messageBodyPart.setFileName(filename);
            multipart.addBodyPart(messageBodyPart);
             message.setContent(multipart);
            
            Transport.send(message);
            session.setAttribute("msg","Mail Sent successfully.");
            }
            else{
                session.setAttribute("msg","Wrong Emial ID");
            }
            return "Doctor";
        }
        catch(Exception e) {
        e.printstacktrace();
        return "Error";
        }
    } ```

解决方法

这有点像在黑暗中拍摄,因为我不相信我真正理解这个问题。如果问题是如何使用文件代替MultipartFile并获得InputStream ,答案是使用现有的库,例如Files.newInputStream,并以Path作为参数。 >

Path path = Paths.get("path","to","my","file");

try (InputStream input = Files.newInputStream(path)) {

}
,

解决方案

this other Stack Overflow answer (此答案作为社区Wiki发布),您可以在前端获取文件对象并将其转换为base64对象,如下所示:

const toBase64 = file => new Promise((resolve,reject) => {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => resolve(reader.result);
    reader.onerror = error => reject(error);
});

async function Main() {
   const file = document.querySelector('#myfile').files[0];
   console.log(await toBase64(file));
}

Main();

然后,使用此Base64对象,您可以通过PUT请求将其发送到后端,然后按照Gmail API分段上传说明将其附加到电子邮件。

我希望这对您有所帮助。让我知道您是否需要其他任何东西,或者您是否不了解。 :)