怎样得到未读邮件的个数!我只要得到未读邮件的个数就行了!怎么弄!

[凉凉二点凉]

我在javamail的demo中找到了这个程序我直接抄了下来可是运行有错!
package testThinking;
import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;

/*
* Demo app that exercises the Message interfaces.
* Access message given its UID.
* Show information about and contents of messages.
*
* @author John Mani
* @author Bill Shannon
*/

public class MailTest {

static String protocol="pop3";
static String host = ".......";
static String user = "test";
static String password = "test";
static String mbox = "INBOX";
static String url = null;
static boolean verbose = false;

public static void main(String argv[]) {
long uid = -1;
int optind;

for (optind = 0; optind < argv.length; optind++) {
if (argv[optind].equals("-T")) {
protocol = argv[++optind];
} else if (argv[optind].equals("-H")) {
host = argv[++optind];
} else if (argv[optind].equals("-U")) {
user = argv[++optind];
} else if (argv[optind].equals("-P")) {
password = argv[++optind];
} else if (argv[optind].equals("-v")) {
verbose = true;
} else if (argv[optind].equals("-f")) {
mbox = argv[++optind];
} else if (argv[optind].equals("-L")) {
url = argv[++optind];
} else if (argv[optind].equals("--")) {
optind++;
break;
} else if (argv[optind].startsWith("-")) {
System.out.println("Usage: uidmsgshow [-L url] [-T protocol] [-H host] [-U user] [-P password] [-f mailbox] [uid] [-v]");
System.exit(1);
} else {
break;
}
}

try {
if (optind < argv.length)
uid = Long.parseLong(argv[optind]);

// Get a Properties object
Properties props = System.getProperties();

// Get a Session object
Session session = Session.getInstance(props, null);
// session.setDebug(true);

// Get a Store object
Store store = null;
if (url != null) {
URLName urln = new URLName(url);
store = session.getStore(urln);
store.connect();
} else {
if (protocol != null)
store = session.getStore(protocol);
else
store = session.getStore();

// Connect
if (host != null || user != null || password != null)
store.connect(host, user, password);
else
store.connect();
}


// Open the Folder

Folder folder = store.getDefaultFolder();
if (folder == null) {
System.out.println("No default folder");
System.exit(1);
}

folder = folder.getFolder(mbox);
if (!folder.exists()) {
System.out.println(mbox + " does not exist");
System.exit(1);
}

if (!(folder instanceof UIDFolder)) {
System.out.println(
"This Provider or this folder does not support UIDs");
System.exit(1);
}

UIDFolder ufolder = (UIDFolder)folder;

folder.open(Folder.READ_WRITE);
int totalMessages = folder.getMessageCount();

if (totalMessages == 0) {
System.out.println("Empty folder");
folder.close(false);
store.close();
System.exit(1);
}

if (verbose) {
int newMessages = folder.getNewMessageCount();
System.out.println("Total messages = " + totalMessages);
System.out.println("New messages = " + newMessages);
System.out.println("-------------------------------");
}

if (uid == -1) {
// Attributes & Flags for ALL messages ..
Message[] msgs =
ufolder.getMessagesByUID(1, UIDFolder.LASTUID);

// Use a suitable FetchProfile
FetchProfile fp = new FetchProfile();
fp.add(FetchProfile.Item.ENVELOPE);
fp.add(FetchProfile.Item.FLAGS);
fp.add("X-Mailer");
folder.fetch(msgs, fp);

for (int i = 0; i < msgs.length; i++) {
System.out.println("--------------------------");
System.out.println("MESSAGE UID #" +
ufolder.getUID(msgs[i]) + ":");
dumpEnvelope(msgs[i]);
// dumpPart(msgs[i]);
}
} else {
System.out.println("Getting message UID: " + uid);
Message m = ufolder.getMessageByUID(uid);
if (m != null)
dumpPart(m);
else
System.out.println(
"This Message does not exist on this folder");
}

folder.close(false);
store.close();
} catch (Exception ex) {
System.out.println("Oops, got exception! " + ex.getMessage());
ex.printStackTrace();
}
System.exit(1);
}

public static void dumpPart(Part p) throws Exception {
if (p instanceof Message)
dumpEnvelope((Message)p);

/* Dump input stream
InputStream is = new BufferedInputStream(p.getInputStream());
int c;
while ((c = is.read()) != -1)
System.out.write(c);
*/

System.out.println("CONTENT-TYPE: " + p.getContentType());

Object o = p.getContent();
if (o instanceof String) {
System.out.println("This is a String");
System.out.println("---------------------------");
System.out.println((String)o);
} else if (o instanceof Multipart) {
System.out.println("This is a Multipart");
System.out.println("---------------------------");
Multipart mp = (Multipart)o;
int count = mp.getCount();
for (int i = 0; i < count; i++)
dumpPart(mp.getBodyPart(i));
} else if (o instanceof Message) {
System.out.println("This is a Nested Message");
System.out.println("---------------------------");
dumpPart((Part)o);
} else if (o instanceof InputStream) {
System.out.println("This is just an input stream");
System.out.println("---------------------------");
InputStream is = (InputStream)o;
int c;
while ((c = is.read()) != -1)
System.out.write(c);
}
}

public static void dumpEnvelope(Message m) throws Exception {
System.out.println("This is the message envelope");
System.out.println("---------------------------");
Address[] a;
// FROM
if ((a = m.getFrom()) != null) {
for (int j = 0; j < a.length; j++)
System.out.println("FROM: " + a[j].toString());
}

// TO
if ((a = m.getRecipients(Message.RecipientType.TO)) != null) {
for (int j = 0; j < a.length; j++)
System.out.println("TO: " + a[j].toString());
}

// SUBJECT
System.out.println("SUBJECT: " + m.getSubject());

// DATE
Date d = m.getSentDate();
System.out.println("SendDate: " +
(d != null ? d.toString() : "UNKNOWN"));

// SIZE
System.out.println("Size: " + m.getSize());

// FLAGS:
Flags flags = m.getFlags();
StringBuffer sb = new StringBuffer();
Flags.Flag[] sf = flags.getSystemFlags(); // get the system flags

boolean first = true;
for (int i = 0; i < sf.length; i++) {
String s;
Flags.Flag f = sf[i];
if (f == Flags.Flag.ANSWERED)
s = "\\Answered";
else if (f == Flags.Flag.DELETED)
s = "\\Deleted";
else if (f == Flags.Flag.DRAFT)
s = "\\Draft";
else if (f == Flags.Flag.FLAGGED)
s = "\\Flagged";
else if (f == Flags.Flag.RECENT)
s = "\\Recent";
else if (f == Flags.Flag.SEEN)
s = "\\Seen";
else
continue; // skip it
if (first)
first = false;
else
sb.append(' ');
sb.append(s);
}

String[] uf = flags.getUserFlags(); // get the user flag strings
for (int i = 0; i < uf.length; i++) {
if (first)
first = false;
else
sb.append(' ');
sb.append(uf[i]);
}
System.out.println("FLAGS = " + sb.toString());

// X-MAILER
String[] hdrs = m.getHeader("X-Mailer");
if (hdrs != null)
System.out.println("X-Mailer: " + hdrs[0]);
else
System.out.println("X-Mailer NOT available");
}
}
报这个错!应该怎么解决This Provider or this folder does not support UIDs

[凉凉二点凉]

来人啊