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如何从mail server删除一条消息的例子

摘要: 如何从mail server删除一条消息的例子

Question How do you delete a message from the mail server?
Derived from An unanswered question originally posed by Benjamin Alejandro Rodriguez Rengifo
Topics Java:API:JavaMail:IMAP4, Java:API:JavaMail:POP3
Author John Zukowski
Created 23-Feb-00 Modified 25-Jul-00


Answer

The basic process of deleting a message is to call setFlag() on the message and set the Flags.Flag.DELETED flag to true.

message.setFlag(Flags.Flag.DELETED, true);

Then, when you close the folder, deleted messages will be removed.

Be sure to open the folder for read/write access:

folder.open(Folder.READ_WRITE);

The following program demonstrates listing each message in the folder and prompting for deletion:

import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;

public class DeleteMessageExample {
public static void main (String args[]) throws Exception {
String host = args[0];
String username = args[1];
String password = args[2];

// Get session
Session session = Session.getInstance(
System.getProperties(), null);

// Get the store
Store store = session.getStore("pop3");
store.connect(host, username, password);

// Get folder
Folder folder = store.getFolder("INBOX");
folder.open(Folder.READ_WRITE);

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

// Get directory
Message message[] = folder.getMessages();
for (int i=0, n=message.length; i System.out.println(i + ": " + message[i].getFrom()[0]
+ "" + message[i].getSubject());

System.out.println("Do you want to delete message? [YES to delete]");
String line = reader.readLine();
// Mark as deleted if appropriate
if ("YES".equals(line)) {
message[i].setFlag(Flags.Flag.DELETED, true);
}
}

// Close connection
folder.close(true);
store.close();
}
}

You can also expunge() the Folder. However, the POP3 server from Sun does not support this operation.
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