通过GMailSender发送带有附件的电子邮件？ [英] Sending email with attachment through GMailSender?
本文介绍了通过GMailSender发送带有附件的电子邮件？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我一直在阅读博客，并已试过无数的实现但仍然未能获得附加到我通过Gmail使用Java发送电子邮件的图像。我下载了所有的罐子，并添加GMailSender.java，GMailAuthenticator.java和JSSEProvider.java，我能够定期发送电子邮件就好了。我试着做这件事的方法如下所示，与多数民众赞成注释掉的是我曾希望加入的图像部分的中间部分。下面是当我尝试执行此在的logcat输出。当然，我失去了一些东西pretty的简单。可能有人指出来我好吗？先谢谢了。
市民同步无效的sendmail（字符串学科，身体的字符串，字符串发件人，收件人字符串）抛出异常{
尝试 {
Thread.currentThread（）setContextClassLoader（的getClass（）getClassLoader（）。）。
的MimeMessage消息=新的MimeMessage（会议）;
DataHandler的处理程序=新的DataHandler（新ByteArrayDataSource（body.getBytes（），text / plain的））;
message.setSender（新网际（发件人））;
message.setSubject（学科）;
message.setDataHandler（处理）;
/ *
//创建新的邮件部分
BodyPart的imgPart =新MimeBodyPart（）;
//创建一个相关的多部分的零件组合
MimeMultipart的多部分=新MimeMultipart的（相关）;
multipart.addBodyPart（imgPart）;
字符串文件名=HTTP：//.../sampleBar$c$c.png;
类加载器的类加载器= Thread.currentThread（）getContextClassLoader（）。
如果（类加载器== NULL）{
类加载器= this.getClass（）getClassLoader（）。
如果（类加载器== NULL）{
的System.out.println（IT IS NULL AGAIN !!!!）;
}
}
数据源DS =新一个URLDataSource（ClassLoader.getResource方法，（文件名））;
imgPart.setDataHandler（新的DataHandler（DS））;
imgPart.setHeader（内容ID，＆其中; logoimg_cid＆gt;中）;
multipart.addBodyPart（imgPart）;
message.setContent（多部分）;
* /
如果（recipients.indexOf（，）大于0）{
message.setRecipients（Message.RecipientType.TO，InternetAddress.parse（收件人））;
}
其他message.setRecipient（Message.RecipientType.TO，新的网际（收件人））;
Transport.send（消息）;
}
赶上（例外五）{Log.e（EMAIL_ERROR，e.getMessage（），E）;}
}
空值
显示java.lang.NullPointerException
在javax.activation.URLDataSource.getContentType（URLDataSource.java:91）
在javax.activation.DataHandler.getContentType（DataHandler.java:218）
...
...
（加上一些更多）
解决方案
我修改了函数接受文件的参数，并将其附加到电子邮件，这里是
市民同步无效的sendmail（字符串学科，身体的字符串，字符串发件人，收件人的字符串，文件附件）抛出异常{
尝试{
的MimeMessage消息=新的MimeMessage（会议）;
message.setSender（新网际（发件人））;
message.setSubject（学科）;
MimeBodyPart MBP1 =新MimeBodyPart（）;
mbp1.setText（体）;
MimeBodyPart mbp2 =新MimeBodyPart（）;
FileDataSource FDS =新FileDataSource（挂职）;
mbp2.setDataHandler（新的DataHandler（FDS））;
mbp2.setFileName（fds.getName（））;
多部分MP =新MimeMultipart的（）;
mp.addBodyPart（MBP1）;
mp.addBodyPart（mbp2）;
message.setContent（MP）;
如果（recipients.indexOf（，）大于0）
message.setRecipients（Message.RecipientType.TO，InternetAddress.parse（收件人））;
其他
message.setRecipient（Message.RecipientType.TO，新的网际（收件人））;
Transport.send（消息）;
}赶上（例外五）{
}
}
I have been reading the blogs and have tried numerous implementations but have still failed to get an image attached to an email that I'm sending through GMail using java. I downloaded all the jars and added GMailSender.java, GMailAuthenticator.java, and JSSEProvider.java and I'm able to send regular e-mails just fine. The way I've tried doing it is shown below, with the middle part that's commented out being the part I had hoped would add the image. Below that is the output on the logcat when I try to execute this. Surely I am missing something pretty simple. Could someone point it out to me please? Thanks in advance.
public synchronized void sendMail(String subject, String body, String sender, String recipients) throws Exception {
try {
Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
MimeMessage message = new MimeMessage(session);
DataHandler handler = new DataHandler(new ByteArrayDataSource(body.getBytes(), "text/plain"));
message.setSender(new InternetAddress(sender));
message.setSubject(subject);
message.setDataHandler(handler);
/*
// Create your new message part
BodyPart imgPart = new MimeBodyPart();
// Create a related multi-part to combine the parts
MimeMultipart multipart = new MimeMultipart("related");
multipart.addBodyPart(imgPart);
String fileName = "http://.../sampleBarcode.png";
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
classLoader = this.getClass().getClassLoader();
if (classLoader == null) {
System.out.println("IT IS NULL AGAIN!!!!");
}
}
DataSource ds = new URLDataSource(classLoader.getResource(fileName));
imgPart.setDataHandler(new DataHandler(ds));
imgPart.setHeader("Content-ID", "<logoimg_cid>");
multipart.addBodyPart(imgPart);
message.setContent(multipart);
*/
if(recipients.indexOf(',') > 0) {
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
}
else message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
Transport.send(message);
}
catch(Exception e){Log.e("EMAIL_ERROR",e.getMessage(), e);}
}
null
java.lang.NullPointerException
at javax.activation.URLDataSource.getContentType(URLDataSource.java:91)
at javax.activation.DataHandler.getContentType(DataHandler.java:218)
...
...
(plus some more)
解决方案
I modified the function to accept a File parameter and attach it to the email, here it is
public synchronized void sendMail(String subject, String body, String sender, String recipients, File attachment) throws Exception {
try{
MimeMessage message = new MimeMessage(session);
message.setSender(new InternetAddress(sender));
message.setSubject(subject);
MimeBodyPart mbp1 = new MimeBodyPart();
mbp1.setText(body);
MimeBodyPart mbp2 = new MimeBodyPart();
FileDataSource fds = new FileDataSource(attachment);
mbp2.setDataHandler(new DataHandler(fds));
mbp2.setFileName(fds.getName());
Multipart mp = new MimeMultipart();
mp.addBodyPart(mbp1);
mp.addBodyPart(mbp2);
message.setContent(mp);
if (recipients.indexOf(',') > 0)
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipients));
else
message.setRecipient(Message.RecipientType.TO, new InternetAddress(recipients));
Transport.send(message);
}catch(Exception e){
}
}
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