Java登陆邮箱（需要的jar包-mail.jar）：

package org.javaweb.util;
import java.util.Properties;
import javax.mail.Session;
import javax.mail.Transport;
public class Mail {
	public boolean login(String host, int port, String user, String password) {
		try {
			Properties props = new Properties();
			props.setProperty("mail.smtp.auth", "true");
			props.setProperty("mail.transport.protocol", "smtp");
			Session session = Session.getInstance(props);
			Transport transport = session.getTransport();
			transport.connect(host, port, user,password);
			transport.close();
			return true;
		} catch (Exception e) {
			System.out.println(e.toString());
			return false;
		}
	}
}