在Servlet或JSP中调用java类函数时，javax.mail.AuthenticationFailedException:EOF在套接字上出现异常？

当我在Servlet或JSP中调用java类函数时，我得到了一个异常javax.mail.AuthenticationFailedException:EOF on socket。而DowAttAndSetInfoInDB.java类工作正常。我可以；因为我是java邮件api的初学者，所以两天内无法解决它。我做了一些谷歌搜索，但问题仍然没有解决

DowAttAndSetInfoInDB.java

package com.unread.donatt;

public class DowAttAndSetInfoInDB {

    private String saveDirectory;
    Connection con = GetCon.getCon();

    /**
     * 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) throws SQLException {
        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 froms = 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();
                    //System.out.println(multiPart);
                    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();
                    }
                }
                messageContent = getTextFromMessage(message);
                String insertMessage = "INSERT INTO inbox"
                        + "(userName, froms, subject, sentDate, messageContent,attachFiles) VALUES"
                        + "(?,?,?,?,?,?)";
                PreparedStatement ps = con.prepareStatement(insertMessage);
                ps.setString(1, userName);
                ps.setString(2, froms);
                ps.setString(3, subject);
                ps.setString(4, sentDate);
                ps.setString(5, messageContent);
                ps.setString(6, attachFiles);

                int rs = ps.executeUpdate();

                // print out details of each message
                System.out.println("Message #" + (i + 1) + ":");
                System.out.println("\t From: " + froms);
                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.");
        } catch (MessagingException ex) {
            System.out.println("Could not connect to the message store " +ex);
        } catch (IOException ex) {
        }

    }



    private String getTextFromMessage(Message message) throws MessagingException, IOException {
    String result = "";
    if (message.isMimeType("text/plain")) {
        result = message.getContent().toString();
    } else if (message.isMimeType("multipart/*")) {
        MimeMultipart mimeMultipart = (MimeMultipart) message.getContent();
        result = getTextFromMimeMultipart(mimeMultipart);
    }
    return result;
}
private String getTextFromMimeMultipart(
        MimeMultipart mimeMultipart)  throws MessagingException, IOException{
    String result = "";
    int count = mimeMultipart.getCount();
    for (int i = 0; i < count; i++) {
        BodyPart bodyPart = mimeMultipart.getBodyPart(i);
        if (bodyPart.isMimeType("text/plain")) {
            result = result + "\n" + bodyPart.getContent();
            break; // without break same text appears twice in my tests
        } else if (bodyPart.isMimeType("text/html")) {
            String html = (String) bodyPart.getContent();
            result = result + "\n" + org.jsoup.Jsoup.parse(html).text();
        } else if (bodyPart.getContent() instanceof MimeMultipart){
            result = result + getTextFromMimeMultipart((MimeMultipart)bodyPart.getContent());
        }
    }
    return result;
}


    /**
     * Runs this program with Gmail POP3 server
     *
     * @param args
     */
    public static void main(String[] args) throws SQLException {
        String host = "pop.gmail.com";
        String port = "995";
        String userName = "dummy2263@gmail.com";
        String password = "****";

        String saveDirectory = "C:\\Users\\ajay\\Desktop\\attch";

        DowAttAndSetInfoInDB receiver = new DowAttAndSetInfoInDB();
        receiver.setSaveDirectory(saveDirectory);
        receiver.downloadEmailAttachments(host, port, userName, password);

    }
}

package com.unread.donatt；
公共类DowAttAndSetInfoInDB{
私有字符串保存目录；
连接con=GetCon.GetCon（）；
/**
*设置存储附加文件的目录。
*
*@param dir目录的绝对路径
*/
公共void setSaveDirectory（字符串目录）{
this.saveDirectory=dir；
}
/**
*下载新邮件并将附件保存到磁盘（如果有）。
*
*@param主机
*@param端口
*@param用户名
*@param密码
*/
public void downloadEmailAttachments（字符串主机、字符串端口、，
字符串用户名、字符串密码）引发SQLException{
属性=新属性（）；
//服务器设置
properties.put（“mail.pop3.host”，host）；
properties.put（“mail.pop3.port”，port）；
//SSL设置
properties.setProperty（“mail.pop3.socketFactory.class”，
“javax.net.ssl.SSLSocketFactory”）；
properties.setProperty（“mail.pop3.socketFactory.fallback”、“false”）；
properties.setProperty（“mail.pop3.socketFactory.port”，
字符串.valueOf（port））；
Session Session=Session.getDefaultInstance（属性）；
试一试{
//连接到消息存储
Store Store=session.getStore（“pop3”）；
store.connect（用户名、密码）；
//打开收件箱文件夹
Folder folderInbox=store.getFolder（“收件箱”）；
folderInbox.open（文件夹只读）；
//从服务器获取新邮件
Message[]arrayMessages=folderInbox.getMessages（）；
for（int i=0；i1）{
attachFiles=attachFiles.substring（0，attachFiles.length（）-2）；
}
}else if（contentType.contains（“text/plain”）
||contentType.contains（“text/html”））{
对象内容=message.getContent（）；
如果（内容！=null）{
messageContent=content.toString（）；
}
}
messageContent=getTextFromMessage（message）；
String insertMessage=“插入收件箱”
+（用户名、发件人、主题、发送日期、消息内容、附件）值
+ "(?,?,?,?,?,?)";
PreparedStatement ps=con.prepareStatement（插入消息）；
ps.setString（1，用户名）；
ps.setString（2，FROM）；
ps.setString（3，主题）；
ps.setString（4，sentDate）；
ps.setString（5，消息内容）；
ps.setString（6个附件）；
int rs=ps.executeUpdate（）；
//打印出每封邮件的详细信息
System.out.println（“消息#”+（i+1）+“：”；
System.out.println（“\t-From:”+froms）；
System.out.println（“\t主题：“+主题”）；
System.out.println（“\t发送日期：“+sentDate”）；
System.out.println（“\t Message:+messageContent”）；
System.out.println（“\t附件：“+attachFiles”）；
}
//断开
folderInbox.close（假）；
store.close（）；
}捕获（无此提供异常例外）{
System.out.println（“pop3没有提供程序”）；
}捕获（消息例外）{
System.out.println（“无法连接到消息存储”+ex）；
}捕获（IOEX异常）{
}
}
私有字符串getTextFromMessage（消息消息）抛出MessaginException，IOException{
字符串结果=”；
if（message.isMimeType（“text/plain”））{
结果=message.getContent（）.toString（）；
}else if（message.isMimeType（“multipart/*”）{
        <%

            String host = "pop.gmail.com";
            String port = "995";//587
            String userName = "dummy2263@gmail.com";
            String password = "****";

            String saveDirectory = "C:\\Users\\ajay\\Desktop\\attch";

            DowAttAndSetInfoInDB receiver = new DowAttAndSetInfoInDB();
            receiver.setSaveDirectory(saveDirectory);
            receiver.downloadEmailAttachments(host, port, userName, password);
 %>