从Docker容器中的Springboot Resources读取文件

Question

我正在尝试在电子邮件正文中发送带有内联图像的电子邮件。当我从Eclipse本地运行它时，该代码正常工作。但是，当它被停靠并部署到kubernetes群集时，它无法读取PNG文件。

我会遇到错误“ java.io.filenotfoundexception：类路径资源[external_files/email_template.png]无法解决到绝对文件路径，因为它不属于文件系统：jar：jar：file：/app.jar！/boot！/boot！ -inf/class！/external_files/email_template.png“ 项目结构屏幕截图

MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(fromEmail));
message.setSubject(AppConstants.EMAIL_SUBJECT);
MimeMultipart multipart = new MimeMultipart(AppConstants.RELATED);
MimeBodyPart messageBodyPart = new MimeBodyPart();
String html = AppConstants.EMAIL_HTML_PART_1 + recepientName + 
AppConstants.EMAIL_HTML_PART_2
    + fromName + AppConstants.EMAIL_HTML_PART_3 + appProperties.getEmailOnboardPage()
    + AppConstants.EMAIL_HTML_PART_4 + appProperties.getEmailHelpPage()
    + AppConstants.EMAIL_HTML_PART_5;
messageBodyPart.setContent(html, AppConstants.TEXT_HTML);
multipart.addBodyPart(messageBodyPart);

MimeBodyPart messageBodyPart2 = new MimeBodyPart();
DataSource fds = new FileDataSource(ResourceUtils.getFile(src/main/resources/External_Files/email_template.png));
 messageBodyPart2.setDataHandler(new DataHandler(fds));
 messageBodyPart2.setHeader(AppConstants.CONTENT_ID, AppConstants.IMAGE_HEADER);
 multipart.addBodyPart(messageBodyPart2);

 message.setContent(multipart);
message.setHeader(AppConstants.X_PRIORITY, AppConstants.ONE);
message.addRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
log.info("executing Transport.send");
Transport.send(message);

png

Answer 1

@Indranil Halder我知道回答已经晚了，但是对于有这个问题的其他人来说，发现此问题很有用，

您可以使用Resoursceloader在Spring Jar文件中找到classpath

@Autowired
ResourceLoader resourceLoader;
Resource resource = resourceLoader.getResource("classpath:External_Files/email_template.png");