//原理：可以将邮件看成有多个部分组成的，如正文是一个部分，附件也是一个部分，所以用BodyPart来设置邮件的格式
message.addRecipient(Message.RecipientType.TO,new InternetAddress(mail_to));
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText("Pardon Ideas");
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart);

messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource("./20020423/test.zip");//此处设置邮件的附件
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName("test.zip");
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
Transport.send(message);
System.out.println("send ok!");
}
catch(Exception ex)
{
System.out.println("faild"+ex);
}

}
//此段代码用来发送带有附件的邮件
void jButton6_actionPerformed(ActionEvent e) {
try
{
Properties props = System.getProperties();
Authenticator auth = new Email_Autherticator();
props.put("mail.smtp.host",host);
props.put("mail.smtp.auth","true");
Session session = Session.getDefaultInstance(props,auth); //建立session
Store store = session.getStore("pop3");
store.connect(host,username,password);

//After connecting to the Store,you can get a Folder,which must be opened before you can read messages from it:
Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_WRITE);
Message message[] = folder.getMessages();

for (int i=0,n=message.length;i {
//获得邮件的部分信息，如头部信息，送信人的署名，送信人的邮件地址
String out_from_person = ((InternetAddress)message[i].getFrom()[0]).getPersonal();
String out_from_address = ((InternetAddress)message[i].getFrom()[0]).getAddress();
System.out.println("From:"+out_from_person+" ");
System.out.println("Address:"+out_from_address+" ");
String out_subject = message[i].getSubject();
System.out.println("Subject:"+out_subject+" ");

//以下代码用来获取邮件的主体信息
Part messagePart = message[i];
Object out_content = messagePart.getContent();
if (out_content instanceof Multipart)
{
messagePart = ((Multipart)out_content).getBodyPart(0);
System.out.println("[ Multipart Message ]");
}
String out_content_type = messagePart.getContentType();
System.out.println("CONTENT:"+out_content_type);

if (out_content_type.startsWith("text/plain") | | out_content_type.startsWith("text/html"))
{
InputStream ipstm = messagePart.getInputStream();
BufferedReader bufreader = new BufferedReader(new InputStreamReader(ipstm));
String thisLine = bufreader.readLine();
while (thisLine != null)
{
System.out.println("thisLine: "+thisLine);
thisLine = bufreader.readLine();
}
}
//获取附件
Multipart mp = (Multipart)message[i].getContent();
for (int j=0,m=mp.getCount();j {
System.out.println("***"+m+"***");
Part part = mp.getBodyPart(j);
String disposition = part.getDisposition();
if ((disposition != null) && ((disposition.equals(part.ATTACHMENT)) | | (disposition.equals(part.INLINE))))
{

//以下代码将获得的附件保存到当前目录下，以part.getFileName()为文件名，也既是附件的名称。
File filename = new File(part.getFileName());
for (int k=0;filename.exists();k++)
{
filename = new File(part.getFileName()+k);
}
FileOutputStream myFileoutputstream = new FileOutputStream(filename);
int chunk = part.getSize();//获得附件的大小，不一定很准确。

byte [] buffer = new byte[chunk];
InputStream instream = part.getInputStream();
instream.read(buffer,0,chunk);
myFileoutputstream.write(buffer,0,chunk);
instream.close();
myFileoutputstream.close();
}
}
System.out.println("-------------------------------");
message[i].setFlag(Flags.Flag.DELETED,true)；
}
folder.close(true);
store.close();//关闭
}
catch(Exception ej2)
{
System.out.println(ej2);
}
}