Question

我尝试从Java2s.com获取附件文件名的教程。我正在做的是从Outlook Web Access Light中读取电子邮件。如果我把Outlook Web Access Light的URL地址，我有错误：

Exception in thread "main" javax.mail.NoSuchProviderException: No provider for http
        at javax.mail.Session.getProvider(Session.java:455)
        at javax.mail.Session.getStore(Session.java:530)
        at javax.mail.Session.getFolder(Session.java:602)
        at MainClass.main(MainClass.java:19)
Java Result: 1

我不明白这句话：

("protocol://username@host/foldername");

这是代码：

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Part;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.URLName;
import javax.mail.internet.InternetAddress;

public class MainClass {

  public static void main(String[] args) throws Exception {
    URLName server = new URLName("protocol://username@host/foldername");

    Session session = Session.getDefaultInstance(new Properties(), new MailAuthenticator());

    Folder folder = session.getFolder(server);
    if (folder == null) {
      System.out.println("Folder " + server.getFile() + " not found.");
      System.exit(1);
    }
    folder.open(Folder.READ_ONLY);

    Message[] messages = folder.getMessages();
    for (int i = 0; i < messages.length; i++) {
      System.out.println(messages[i].getSize() + " bytes long.");
      System.out.println(messages[i].getLineCount() + " lines.");
      String disposition = messages[i].getDisposition();
      if (disposition == null){
        ; // do nothing
      }else if (disposition.equals(Part.INLINE)) {
        System.out.println("This part should be displayed inline");
      } else if (disposition.equals(Part.ATTACHMENT)) {
        System.out.println("This part is an attachment");
        String fileName = messages[i].getFileName();
        System.out.println("The file name of this attachment is " + fileName);
      }
      String description = messages[i].getDescription();
      if (description != null) {
        System.out.println("The description of this message is " + description);
      }
    }
    folder.close(false);
  }
}

class MailAuthenticator extends Authenticator {

  public MailAuthenticator() {
  }

  public PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication("username", "password");
  }
}

感谢您的支持祝你有愉快的一天

Answer 1

我不确定，但"protocol://username@host/foldername"似乎描述的是格式而不是真实的网址，即它告诉您添加协议，用户名，主机和文件夹，如"http://Thomas@stackoverflow.com/need-help-about-get-attachment-file-name-tutorial-from-java2s-com"（只是一个如何看起来的例子，这个特殊的网址不太可能工作/存在/无论如何:)）。

Answer 2

鉴于错误消息，我认为javaMail期望“smtp：”或“imap：”或“pop3：”的协议之一，因为它是构建其会话的方式。我不认为它会用于Web访问，您必须获取Web界面连接到的pop3 / imp / smtp服务器的地址。

需要有关Java2s.com的“获取附件文件名”教程的帮助

2 个答案: