viewmessagelistaction.java

21天学通java的示例程序源代码

package ezmail;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

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

public class ViewMessageListAction implements Action {

	public ViewMessageListAction() {
	}

	/**
	 *  Performs the following steps...
	 *  <ol>
	 *		<li>....</li>
	 *  </ol>
	 *
	 *  The data is then placed in the user's session.  The attribute is named
	 *  <code>Constants.DATA</code>
	 */
	public void perform(ServletContext servletContext,
						HttpServletRequest request,
						HttpServletResponse response) throws ActionException {

		try {
			HttpSession theHttpSession = request.getSession();

			// retrieve the mail session
			Session mailSession = (Session) theHttpSession.getAttribute(Constants.MAIL_SESSION);
			UserInfo theUserInfo = (UserInfo) theHttpSession.getAttribute(Constants.USER_INFO);

			// retrieve the messages from the user's inbox
			Message[] msgs = MailHelper.getMessages(mailSession, theUserInfo);

			// place the messages in the http session
			theHttpSession.setAttribute(Constants.MESSAGE_LIST, msgs);
		}
		catch (Exception exc) {
			exc.printStackTrace();
			throw new ActionException(exc.getMessage());
		}
	}

}