javax.mail如何将图像文件夹附加到java项目

我使用javax.mail

项目结构如下：

我想将项目路径中的图像附加到邮件正文

resources/imgecalcp/fondoencabezado_marron.png

我的代码是

MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(from));
msg.addRecipient(Message.RecipientType.TO,
                             new InternetAddress(to));
msg.setSubject(subject,"UTF-8");
MimeMultipart multipart = new MimeMultipart("related");
MimeBodyPart messageBodyPart = new MimeBodyPart();
htmlFinal = ConversionTools.convertTypeHTML(body);
messageBodyPart.setContent(htmlFinal, "text/html");
multipart.addBodyPart(messageBodyPart);
messageBodyPart = new MimeBodyPart();
messageBodyPart.attachFile("resources/imgecalcp/fondoencabezado_marron.png");
messageBodyPart.setHeader("Content-ID", "<image>");
multipart.addBodyPart(messageBodyPart);
msg.setContent(multipart);
Transport.send(msg);    

MimeMessage msg=新MimeMessage（会话）；
msg.setFrom（新因特网地址（from））；
msg.addRecipient（Message.RecipientType.TO，
新互联网地址(至);；
消息集主题（主题“UTF-8”）；
MimMultipart multipart=新的MimMultipart（“相关”）；
MimeBodyPart messageBodyPart=新的MimeBodyPart（）；
htmlFinal=ConversionTools.convertTypeHTML（正文）；
setContent（htmlFinal，“text/html”）；
multipart.addBodyPart（messageBodyPart）；
messageBodyPart=新的MimeBodyPart（）；
messageBodyPart.attachFile（“resources/imgecalcp/fondoencabezado_marron.png”）；
messageBodyPart.setHeader（“内容ID”，即“”）；
multipart.addBodyPart（messageBodyPart）；
msg.setContent（多部分）；
发送（msg）；

我有个例外

java.io.FileNotFoundException: resources\imgecalcp\fondoencabezado_marron.png (El sistema no puede encontrar la ruta especificada)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:120)
    at javax.activation.FileDataSource.getInputStream(FileDataSource.java:82)
    at javax.activation.DataHandler.writeTo(DataHandler.java:290)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1403)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:874)
    at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:444)
    at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:102)
    at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:869)
    at javax.activation.DataHandler.writeTo(DataHandler.java:302)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1403)
    at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1745)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:636)
    at javax.mail.Transport.send0(Transport.java:189)
    at javax.mail.Transport.send(Transport.java:118)
    at eusurvey.tools.MailSender.run(MailSender.java:172)
    at eusurvey.tools.MailSender$$FastClassByCGLIB$$280bfa43.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:701)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:634)
    at eusurvey.tools.MailSender$$EnhancerByCGLIB$$f6b68da0.run(<generated>)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
2017-04-28 07:58:06-77048 [Thread-69] (MailSender.java:176) INFO  eusurvey.tools.MailSender  - MailSender.- run .- MessagingException send failed, exception: IOException while sending message
javax.mail.MessagingException: IOException while sending message;
  nested exception is:
    java.io.FileNotFoundException: resources\imgecalcp\fondoencabezado_marron.png (El sistema no puede encontrar la ruta especificada)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:676)
    at javax.mail.Transport.send0(Transport.java:189)
    at javax.mail.Transport.send(Transport.java:118)
    at eusurvey.tools.MailSender.run(MailSender.java:172)
    at eusurvey.tools.MailSender$$FastClassByCGLIB$$280bfa43.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:701)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:634)
    at eusurvey.tools.MailSender$$EnhancerByCGLIB$$f6b68da0.run(<generated>)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.FileNotFoundException: resources\imgecalcp\fondoencabezado_marron.png (El sistema no puede encontrar la ruta especificada)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:120)
    at javax.activation.FileDataSource.getInputStream(FileDataSource.java:82)
    at javax.activation.DataHandler.writeTo(DataHandler.java:290)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1403)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:874)
    at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:444)
    at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:102)
    at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:869)
    at javax.activation.DataHandler.writeTo(DataHandler.java:302)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1403)
    at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1745)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:636)
    ... 16 more
354 Start mail input; end with <CRLF>.<CRLF>
java.io.FileNotFoundException: resources\imgecalcp\fondoencabezado_marron.png (El sistema no puede encontrar la ruta especificada)
javax.mail.MessagingException: IOException while sending message;
  nested exception is:
    java.io.FileNotFoundException: resources\imgecalcp\fondoencabezado_marron.png (El sistema no puede encontrar la ruta especificada)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:676)
    at javax.mail.Transport.send0(Transport.java:189)
    at javax.mail.Transport.send(Transport.java:118)
    at eusurvey.tools.MailSender.run(MailSender.java:172)
    at eusurvey.tools.MailSender$$FastClassByCGLIB$$280bfa43.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:701)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:634)
    at eusurvey.tools.MailSender$$EnhancerByCGLIB$$f6b68da0.run(<generated>)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

java.io.FileNotFoundException:resources\imgecalcp\fondoencabezado_marron.png
在java.io.FileInputStream.open（本机方法）
位于java.io.FileInputStream。（FileInputStream.java:120）
位于javax.activation.FileDataSource.getInputStream（FileDataSource.java:82）
位于javax.activation.DataHandler.writeTo（DataHandler.java:290）
在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:1403）
在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:874）
位于javax.mail.internet.MimeMultipart.writeTo（MimeMultipart.java:444）
位于com.sun.mail.handlers.multipart\u mixed.writeTo（multipart\u mixed.java:102）
位于javax.activation.ObjectDataContentHandler.writeTo（DataHandler.java:869）
位于javax.activation.DataHandler.writeTo（DataHandler.java:302）
在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:1403）
在javax.mail.internet.MimeMessage.writeTo（MimeMessage.java:1745）
在com.sun.mail.smtp.SMTPTransport.sendMessage（SMTPTransport.java:636）上
在javax.mail.Transport.send0（Transport.java:189）
在javax.mail.Transport.send（Transport.java:118）
运行（mailssender.java:172）
在eusurvey.tools.mailssender$$FastClassByCGLIB$$280bfa43.invoke（）上
位于org.springframework.cglib.proxy.MethodProxy.invoke（MethodProxy.java:204）
位于org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint（CglibAopProxy.java:701）
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:150）上
位于org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation（TransactionInterceptor.java:96）
位于org.springframework.transaction.interceptor.TransactionSpectSupport.invokeWithinTransaction（TransactionSpectSupport.java:260）
位于org.springframework.transaction.interceptor.TransactionInterceptor.invoke（TransactionInterceptor.java:94）
位于org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:172）
位于org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept（CglibAopProxy.java:634）
在eusurvey.tools.mailssender$$enhancerbyglib$$f6b68da0.run（）上
位于java.util.concurrent.ThreadPoolExecutor$Worker.runTask（ThreadPoolExecutor.java:886）
位于java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:908）
运行（Thread.java:662）
2017-04-28 07:58:06-77048[Thread-69]（mailssender.java:176）INFO eusurvey.tools.mailssender-mailssender.-run.-MessaginException发送失败，异常：发送消息时发生IOException
javax.mail.MessagineException：发送消息时发生IOException；
嵌套异常是：
java.io.FileNotFoundException:resources\imgecalcp\fondoencabezado_marron.png
在com.sun.mail.smtp.SMTPTransport.sendMessage（SMTPTransport.java:676）上
在javax.mail.Transport.send0（Transport.java:189）
在javax.mail.Transport.send（Transport.java:118）
运行（mailssender.java:172）
在eusurvey.tools.mailssender$$FastClassByCGLIB$$280bfa43.invoke（）上
位于org.springframework.cglib.proxy.MethodProxy.invoke（MethodProxy.java:204）
位于org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint（CglibAopProxy.java:701）
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:150）上
位于org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation（TransactionInterceptor.java:96）
位于org.springframework.transaction.interceptor.TransactionSpectSupport.invokeWithinTransaction（TransactionSpectSupport.java:260）
位于org.springframework.transaction.interceptor.TransactionInterceptor.invoke（TransactionInterceptor.java:94）
位于org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:172）
位于org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept（CglibAopProxy.java:634）
在eusurvey.tools.mailssender$$enhancerbyglib$$f6b68da0.run（）上
位于java.util.concurrent.ThreadPoolExecutor$Worker.runTask（ThreadPoolExecutor.java:886）
位于java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:908）
运行（Thread.java:662）
原因：java.io.FileNotFoundException:resources\imgecalcp\fondoencabezado_marron.png
在java.io.FileInputStream.open（本机方法）
位于java.io.FileInputStream。（FileInputStream.java:120）
位于javax.activation.FileDataSource.getInputStream（FileDataSource.java:82）
位于javax.activation.DataHandler.writeTo（DataHandler.java:290）
在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:1403）
在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:874）
在javax.mail.internet.MimeMultipart.writeTo（MimeMultipart.java:44
messageBodyPart.attachFile(new File(classLoader.getResource("imgecalcp/fondoencabezado_marron.png").getFile()));