viewtopicaction.java

JAVA Servlet2.3外文书籍源码

package forum;

import javax.servlet.http.*;

/**
 * Represents the logic behind viewing the details of a topic. This action
 * is responsible for looking up the appropriate Topic instance and placing
 * it in the request in order that the view can display it.
 *
 * @author    Simon Brown
 */
public class ViewTopicAction extends Action {

  /**
   * Peforms the processing associated with this action.
   *
   * @param req   the HttpServletRequest instance
   * @param res   the HttpServletResponse instance
   * @return  the name of the next view
   */
  public String process(HttpServletRequest request, HttpServletResponse response) {

    System.out.println("ViewTopicAction : Processing request");

    // get the id parameter and use it to look up
    // the appropriate Topic instance
    String id = request.getParameter("id");
    Topic topic = Topics.getTopic(Integer.parseInt(id));

    // now that we have the Topic, place it in the request
    // ready for use on the view
    request.setAttribute("topic", topic);

    return "/view-topic.jsp";
  }

}