Java Mail 면접 질문과 답변

Question: Sample code for replying to messages using JavaMail.

Answer: The Message class have a reply() method to configure a new Message with the proper recipient and subject, adding "Re: " if not already there. This does not add any content to the message, reply() method have a boolean parameter indicating whether to reply to only the sender (false) or reply to all (true).

MimeMessage reply = (MimeMessage)message.reply(false);reply.setFrom(new InternetAddress("president@whitehouse.gov"));reply.setText("Thanks");Transport.send(reply);

To configure the reply-to address when sending a message, use the setReplyTo() method.


package com.withoutbook.common;

import java.io.*;
import java.util.*;

import javax.mail.*;
import javax.mail.internet.*;

public class ReplyMail {

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

Date date = null;
Properties properties = System.getProperties();
properties.setProperty("mail.smtp.host", "192.168.10.110");

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_ONLY);

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

Message[] message = folder.getMessages();
if (message.length != 0) {
System.out.println("no. From ttSubject ttDate");
for (int i = 0, n = message.length; i < n; i++) {
date = message[i].getSentDate();

System.out.println(" " + (i + 1) + ": " + message[i].getFrom()[0] + "t" +
message[i].getSubject() + " t" + date.getDate() + "/" +
date.getMonth() + "/" + (date.getYear() + 1900));
System.out.print("Do you want to reply [y/n] : ");
String ans = reader.readLine();
if ("Y".equals(ans) || "y".equals(ans)) {

// Create a reply message
MimeMessage reply = (MimeMessage) message[i].reply(false);

// Set the from field
reply.setFrom(message[i].getFrom()[0]);

// Create the reply content
// Create the reply content, copying over the original if text
MimeMessage orig = (MimeMessage) message[i];
StringBuffer buffer = new StringBuffer("Thanksnn");
if (orig.isMimeType("text/plain")) {
String content = (String) orig.getContent();
StringReader contentReader = new StringReader(content);
BufferedReader br = new BufferedReader(contentReader);
String contentLine;
while ((contentLine = br.readLine()) != null) {
buffer.append("> ");
buffer.append(contentLine);
buffer.append("rn");
}
}
// Set the content
reply.setText(buffer.toString());

// Send the message
Transport.send(reply);

} else if ("n".equals(ans)) {
break;
}
}

} else {
System.out.println("There is no msg....");
}

}
}