[JavaMail] Parcourir le contenu d’une grosse boite mail et java.lang.OutOfMemoryError: Java heap space
Bonjour,
j’ai une boite de réception exchange 2010 en local qui contient 2500 messages, et chaque message contient une ligne texte et une pièce jointe de 500Ko env.
Quand je veux parcourir cette boite je reçois l’exception suivante :
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| Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2786)
at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:71)
at com.sun.mail.pop3.Protocol.multilineCommand(Protocol.java:530)
at com.sun.mail.pop3.Protocol.retr(Protocol.java:338)
at com.sun.mail.pop3.POP3Message.getContentStream(POP3Message.java:141)
at com.sun.mail.pop3.POP3Message.loadHeaders(POP3Message.java:464)
at com.sun.mail.pop3.POP3Message.getHeader(POP3Message.java:264)
at com.sun.mail.pop3.POP3Folder.fetch(POP3Folder.java:405)
at lambda.util.mail.ExchangeUtilities.printAllMessages(ExchangeUtilities.java:141)
at lambda.util.mail.MailTools.testPOP3(MailTools.java:1589)
at lambda.util.mail.MailTools.main(MailTools.java:1690) |
J’ai essayé d’optimiser le code et diviser la boite en des lots de 100 messages, mais l’exception persiste toujours.
voici la classe "ExchangeUtilities" :
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| import com.sun.mail.pop3.POP3Store;
import java.util.Date;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.FetchProfile;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Part;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.URLName;
import javax.mail.internet.ContentType;
import javax.mail.internet.ParseException;
public class ExchangeUtilities {
private Session session = null;
private Store store = null;
private String username, password;
private Folder folder;
public ExchangeUtilities() {
}
public void setUserPass(String username, String password) {
this.username = username;
this.password = password;
}
public void connect() {
try {
int port = 110; // 995
Properties pop3Props = new Properties();
URLName url = new URLName("pop3", "exchange2010.exch.com", port,
"", username, password);
session = Session.getInstance(pop3Props, null);
this.store = new POP3Store(session, url);
System.out.println("Sore : " + store.getURLName().toString());
this.store.connect();
} catch (MessagingException e) {
e.printStackTrace();
}
}
public void openFolder(String folderName) throws Exception {
// Open the Folder
folder = store.getDefaultFolder();
// folder = folder.getFolder(folderName);
folder = folder.getFolder(folderName);
if (folder == null) {
throw new Exception("Invalid folder");
}
// try to open read/write and if that fails try read-only
try {
folder.open(Folder.READ_WRITE);
} catch (MessagingException ex) {
folder.open(Folder.READ_ONLY);
}
}
public void closeFolder() throws Exception {
folder.close(false);
}
public int getMessageCount() {
int messageCount = -1;
try {
messageCount = folder.getMessageCount();
} catch (MessagingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return messageCount;
}
public int getNewMessageCount() throws Exception {
return folder.getNewMessageCount();
}
public void disconnect() throws Exception {
store.close();
}
public void printMessage(int messageNo) throws Exception {
System.out.println("Getting message number: " + messageNo);
Message m = null;
try {
m = folder.getMessage(messageNo);
dumpPart(m);
} catch (IndexOutOfBoundsException iex) {
System.out.println("Message number out of range");
}
}
public void printAllMessageEnvelopes() throws Exception {
// Attributes & Flags for all messages ..
Message[] msgs = folder.getMessages();
// Use a suitable FetchProfile
FetchProfile fp = new FetchProfile();
fp.add(FetchProfile.Item.ENVELOPE);
folder.fetch(msgs, fp);
for (int i = 0; i < msgs.length; i++) {
System.out.println("--------------------------");
System.out.println("MESSAGE #" + (i + 1) + ":");
dumpEnvelope(msgs[i]);
}
}
public void printAllMessages() throws Exception {
// Attributes & Flags for all messages ..
Message[] msgs = folder.getMessages();
// Use a suitable FetchProfile
FetchProfile fp = new FetchProfile();
fp.add(FetchProfile.Item.ENVELOPE);
folder.fetch(msgs, fp);
for (int i = 0; i < msgs.length; i++) {
// i++
System.out.println("--------------------------");
System.out.println("MESSAGE #" + (i + 1) + ":");
dumpPart(msgs[i]);
}
}
public void printAllMessages3() throws Exception {
try {
Message[] msgs;
int messageCount = folder.getMessageCount();
int nbr = messageCount;
int lot = 100;
int i = 0;
int start, end;
// Use a suitable FetchProfile
FetchProfile fp = new FetchProfile();
fp.add(FetchProfile.Item.ENVELOPE);
while (nbr > 0) {
int x = Math.min(lot, nbr);
start = i * lot;
end = ((i * lot) + x) - 1;
i++;
System.out.println("Start : " + start + " | End : " + end); // FT
msgs = folder.getMessages(start + 1, end + 1);
folder.fetch(msgs, fp);
for (int j = start, k = 0; j < start + msgs.length; j++) {
System.out.println("--------------------------");
System.out.println("MESSAGE #" + (j + 1) + ":");
dumpPart(msgs[k]);
dumpEnvelope((Message) msgs[k]);
String ct = msgs[k].getContentType();
try {
pr("CONTENT-TYPE: " + (new ContentType(ct)).toString());
} catch (ParseException pex) {
pr("BAD CONTENT-TYPE: " + ct);
}
/*
* Using isMimeType to determine the content type avoids
* fetching the actual content data until we need it.
*/
if (msgs[k].isMimeType("text/plain")) {
pr("This is plain text");
pr("---------------------------");
System.out.println((String) msgs[k].getContent());
} else {
// just a separator
pr("---------------------------");
}
k++;
}
nbr -= lot;
msgs = null;
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void dumpPart(Part p) throws Exception {
if (p instanceof Message)
dumpEnvelope((Message) p);
String ct = p.getContentType();
try {
pr("CONTENT-TYPE: " + (new ContentType(ct)).toString());
} catch (ParseException pex) {
pr("BAD CONTENT-TYPE: " + ct);
}
/*
* Using isMimeType to determine the content type avoids fetching the
* actual content data until we need it.
*/
if (p.isMimeType("text/plain")) {
pr("This is plain text");
pr("---------------------------");
System.out.println((String) p.getContent());
} else {
// just a separator
pr("---------------------------");
}
}
public static void dumpEnvelope(Message m) throws Exception {
pr(" ");
Address[] a;
// FROM
if ((a = m.getFrom()) != null) {
for (int j = 0; j < a.length; j++)
pr("FROM: " + a[j].toString());
}
// TO
if ((a = m.getRecipients(Message.RecipientType.TO)) != null) {
for (int j = 0; j < a.length; j++) {
pr("TO: " + a[j].toString());
}
}
// SUBJECT
pr("SUBJECT: " + m.getSubject());
// DATE
Date d = m.getSentDate();
pr("SendDate: " + (d != null ? d.toString() : "UNKNOWN"));
}
static String indentStr = " ";
static int level = 0;
/**
* Print a, possibly indented, string.
*/
public static void pr(String s) {
System.out.print(indentStr.substring(0, level * 2));
System.out.println(s);
}
} |
et voici la méthode d'appel :
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| // Méthode d'appel
public static void testPOP3() {
try {
String user = "exch.com\\nom.prenom";
String password = "password";
ExchangeUtilities exchange = new ExchangeUtilities();
exchange.setUserPass(user, password);
exchange.connect();
exchange.openFolder("INBOX");
int totalMessages = exchange.getMessageCount();
int newMessages = exchange.getNewMessageCount();
System.out.println("Total messages = " + totalMessages);
System.out.println("New messages = " + newMessages);
System.out.println("-------------------------------");
exchange.printAllMessages();
// exchange.printAllMessages3();
} catch (Exception e) {
e.printStackTrace();
}
} |
Avez-vous une idée pour contourner ce problème ?
Merci
