以下代码应该从邮件中下载任何附件(如果有(。Gmali ， pop3 ， javax.mail ...任何想法如何做到这一点，也许是针对邮件的特定发件人，或者检查该邮件标题中是否有特定的单词或类似的东西？
package emailattachmentsdownloader;
import java.io.File;
import java.io.IOException;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.NoSuchProviderException;
import javax.mail.Part;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.MimeBodyPart;
/**
* This program demonstrates how to download e-mail messages and save
* attachments into files on disk.
*
*
*
*/
public class EmailAttachmentsDownloader {
private String saveDirectory;
/**
* Sets the directory where attached files will be stored.
* @param dir absolute path of the directory
*/
public void setSaveDirectory(String dir) {
this.saveDirectory = dir;
}
/**
* Downloads new messages and saves attachments to disk if any.
* @param host
* @param port
* @param userName
* @param password
*/
public void downloadEmailAttachments(String host, String port,
String userName, String password) {
Properties properties = new Properties();
// server setting
properties.put("mail.pop3.host", host);
properties.put("mail.pop3.port", port);
// SSL setting
properties.setProperty("mail.pop3.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
properties.setProperty("mail.pop3.socketFactory.fallback", "false");
properties.setProperty("mail.pop3.socketFactory.port",
String.valueOf(port));
Session session = Session.getDefaultInstance(properties);
try {
// connects to the message store
Store store = session.getStore("pop3");
store.connect(userName, password);
// opens the inbox folder
Folder folderInbox = store.getFolder("INBOX");
folderInbox.open(Folder.READ_ONLY);
// fetches new messages from server
Message[] arrayMessages = folderInbox.getMessages();
for (int i = 0; i < arrayMessages.length; i++) {
Message message = arrayMessages[i];
Address[] fromAddress = message.getFrom();
String from = fromAddress[0].toString();
String subject = message.getSubject();
String sentDate = message.getSentDate().toString();
String contentType = message.getContentType();
String messageContent = "";
// store attachment file name, separated by comma
String attachFiles = "";
if (contentType.contains("multipart")) {
// content may contain attachments
Multipart multiPart = (Multipart) message.getContent();
int numberOfParts = multiPart.getCount();
for (int partCount = 0; partCount < numberOfParts; partCount++) {
MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(partCount);
if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) {
// this part is attachment
String fileName = part.getFileName();
attachFiles += fileName + ", ";
part.saveFile(saveDirectory + File.separator + fileName);
} else {
// this part may be the message content
messageContent = part.getContent().toString();
}
}
if (attachFiles.length() > 1) {
attachFiles = attachFiles.substring(0, attachFiles.length() - 2);
}
} else if (contentType.contains("text/plain")
|| contentType.contains("text/html")) {
Object content = message.getContent();
if (content != null) {
messageContent = content.toString();
}
}
// print out details of each message
System.out.println("Message #" + (i + 1) + ":");
System.out.println("t From: " + from);
System.out.println("t Subject: " + subject);
System.out.println("t Sent Date: " + sentDate);
System.out.println("t Message: " + messageContent);
System.out.println("t Attachments: " + attachFiles);
}
// disconnect
folderInbox.close(false);
store.close();
} catch (NoSuchProviderException ex) {
System.out.println("No provider for pop3.");
ex.printStackTrace();
} catch (MessagingException ex) {
System.out.println("Could not connect to the message store");
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
}
/**
* Runs this program with Gmail POP3 server
*/
public static void main(String[] args) {
String host = "pop.gmail.com";
String port = "995";
String userName = "MYMAIL";
String password = "MYPASS";
String saveDirectory = "D:/Attachments";
EmailAttachmentsDownloader receiver = new
EmailAttachmentsDownloader();
receiver.setSaveDirectory(saveDirectory);
receiver.downloadEmailAttachments(host, port, userName, password);
}
}
但是当我运行它时，我收到以下错误。有什么问题，我该怎么办？
Exception in thread "main" java.lang.NoClassDefFoundError:
com/sun/mail/util/MailLogger
at javax.mail.Session.initLogger(Session.java:227)
at javax.mail.Session.<init>(Session.java:212)
at javax.mail.Session.getDefaultInstance(Session.java:315)
at javax.mail.Session.getDefaultInstance(Session.java:355)
at emailattachmentsdownloader.EmailAttachmentsDownloader.downloadEmailAttachments(EmailAttachmentsDownloader.java:53)
at emailattachmentsdownloader.EmailAttachmentsDownloader.main(EmailAttachmentsDownloader.java:144)
Caused by: java.lang.ClassNotFoundException: com.sun.mail.util.MailLogger
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 6 more
C:UsersAcaAppDataLocalNetBeansCache8.2executor-snippetsrun.xml:53:
Java returned: 1
BUILD FAILED (total time: 0 seconds)
在你的pom中添加下面的依赖项.xml然后再次尝试重建：
<dependencies>
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.6.1</version>
</dependency>
</dependencies>