loginmanager.java

ORACLE AQ sample 演示的如何出列

package oracle.otnsamples.AQ.Manager;

/**
 * @author  Rajat Gupta
 * @version 1.0
 *
 * Name of the Application        :  LoginManager.java
 * Development Environment        :  Oracle 9i JDeveloper
 * Creation/Modification History  :
 *
 *    Rajat Gupta       15-Jan-2001      Created
 *
 */

// Servlet Imports
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

// Util Imports
import java.util.Hashtable;

// Other Files
import oracle.otnsamples.AQ.Helper.LoginHelper;

/**
 * This class is invoked when a user enters the Retail Shop as a
 * Customer or as an Admin. It implements the Manager Interface.
 * This class gets the LoginID and Password from the request object
 * and passes it to the LoginHelper.java which creates the query
 * to validate the user.
 * This class is also invoked if the User "Signs Out" of the application.
 * In this case, the session object of the user is invalidated.
 *
 * @see Manager.java
 */
public class LoginManager implements Manager{
  /**
   * Empty Constructor
   */
  public LoginManager(){
  }

  /**
   * This is the main method which validates the User. It gets the entered
   * LoginID and Password from the request object and passes it to the Helper
   * class. If the user is valid, then the required attributes are entered in
   * the Session Object. In case the user is not valid, then the Exception
   * thrown is propagated.
   *
   * @param p_request HttpServlet Request Object
   * @exception Exception In case an unreported Exception is thrown
   * @see LoginHelper.java
   */
  public void validateUser(HttpServletRequest p_request) throws Exception{
    // Get Login, password and type of user from the request object
    String login = p_request.getParameter("Login");
    String password = p_request.getParameter("Passwrd");
    String user = p_request.getParameter("UserType");

    Hashtable userinfo = LoginHelper.validateUser(login, password, user);

    HttpSession session = p_request.getSession(true);

    session.setAttribute("User", user);
    session.setAttribute("Name",userinfo.get("Name"));
    session.setAttribute("ID",login);

    return;
  }

  /**
   * This method is called when the user "Signs Out" of the application.
   * This method gets the Session Object from the HttpRequest and
   * invalidates it.
   *
   * @param p_request HttpServlet Request Object
   * @exception Exception In case an unreported Exception is thrown
   */
  public void inValidateUser(HttpServletRequest p_request) throws Exception{
    p_request.getSession(false).invalidate();
    return;
  }
}