java - 设置类路径资源

Question

我在这段代码中遇到了问题:

final Map<String, File> attachments = new HashMap<>();
		final Map<String, String> inlineResources = new HashMap<String, String>();
		inlineResources.put("logo", "/res/img/IN_payoff.png");
		for (File certificateFile : certificates) {
			attachments.put(certificateFile.getName(), certificateFile);
		}
		YadaEmailParam p = new YadaEmailParam();
		
		p.inlineResources = inlineResources;

		yadaEmailService.sendHtmlEmail(p);
	}

这个错误:

org.springframework.mail.MailSendException: Failed messages: javax.mail.MessagingException: IOException while sending message;
  nested exception is:
	java.io.FileNotFoundException: class path resource [res/img/IN_payoff.png] cannot be opened because it does not exist

如何设置类路径？

Answer 1

如果这是一个 Maven 项目，则类路径中必须可用的资源必须位于 src/main/resources 中。