Java Mail 면접 질문과 답변

Question: Sample code for deleting messages using JavaMail.

Answer: If you want to delete any message then set the message flag delete. There are different types of flags, some system-defined and some user-defined.

* Flags.Flag.ANSWERED* Flags.Flag.DELETED* Flags.Flag.DRAFT* Flags.Flag.FLAGGED* Flags.Flag.RECENT* Flags.Flag.SEEN* Flags.Flag.USERTo delete messages, you set the message's DELETED flag:message.setFlag(Flags.Flag.DELETED, true);Open up the folder in READ_WRITE mode first though:folder.open(Folder.READ_WRITE);Then, when you are done processing all messages, close the folder, passing in a true value to expunge the deleted messages.

folder.close(true);


package com.withoutbook.common;

import com.sun.mail.imap.protocol.FLAGS;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Date;
import java.util.Properties;

import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.InternetAddress;

public class DeleteMail {

public static void main(String args[]) throws Exception {

Properties properties = System.getProperties();

Session session = Session.getDefaultInstance(properties);
Store store = session.getStore("pop3");

store.connect("192.168.10.110", "arindam", "arindam");

Folder folder = store.getFolder("inbox");

if (!folder.exists()) {
System.out.println("inbox not found");
System.exit(0);
}

folder.open(Folder.READ_WRITE);

Message[] msg = folder.getMessages();
//System.out.println((messages.length+1)+" message found");
for (int i = 0; i < msg.length; i++) {
System.out.println("--------- " + (i + 1) + "------------");
String from = InternetAddress.toString(msg[i].getFrom());
if (from != null) {
System.out.println("From: " + from);
}

String replyTo = InternetAddress.toString(
msg[i].getReplyTo());
if (replyTo != null) {
System.out.println("Reply-to: " + replyTo);
}
String to = InternetAddress.toString(
msg[i].getRecipients(Message.RecipientType.TO));
if (to != null) {
System.out.println("To: " + to);
}

String subject = msg[i].getSubject();
if (subject != null) {
System.out.println("Subject: " + subject);
}
Date sent = msg[i].getSentDate();
if (sent != null) {
System.out.println("Sent: " + sent);
}
System.out.println("Message : ");
System.out.println(msg[i].getContent());

}
System.out.println("Enter message no to delete :");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String no = br.readLine();
msg[Integer.parseInt(no) - 1].setFlag(FLAGS.Flag.DELETED, true);
System.out.println("Msg Delete .....");

folder.close(true);
store.close();
}
}