从Mail Server中删除一条消息

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

import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Store;

public class DeleteMessageExample {
        public static void main(String args[]) throws Exception {
                //String host = "smtp.sina.com.cn";
                String host = " mailserver";
                String from = " [e-mail] ";
                String to = "[e-mail]";
                String username = "username";
                String password = "***";
                // 获取系统属性
                // Properties props = System.getProperties();
                // 很多例子中是这样的，其实下面这句更好，可以用在applet中
                Properties props = new Properties();
                // 设置 mail server
                props.put("mail.smtp.host", host);
                props.put("mail.smtp.auth", "true"); //这样才能通过验证
                // Get session
                Session session = Session.getDefaultInstance(props);
                //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 < n; i++) {
                        System.out.println(i + ": " + message[i].getFrom()[0] + "/t"
                                        + message[i].getSubject()+"/n"+
                                        message[i].getContent());
                        System.out
                                        .println("Do you want to delete message? [YES to delete]");
                        //注意邮件将被直接删除，而不是保留在服务器的垃圾箱中
                        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();
        }
}