Struts用户登录实例

package app; import java.io.IOException; import javax.naming.Context; import javax.naming.InitialContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import javax.servlet.http.HttpServletResponse; import javax.sql.DataSource; import org.apache.struts.action.Action; import org.apache.struts.action.ActionErrors; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionMessage; /** * Implementation of <strong>Action</strong> that validates a user logon. * * @author Craig R. McClanahan * @author Ted Husted * @version $Revision: 1.1.1.1 $ $Date: 2002/08/15 15:50:55 $ */ public final class LogonAction extends Action { /** * Validate credentials with business tier. * * @param username * The username credential * @param password * The password credential * @returns true if credentials can be validated * @exception UserDirectoryException * if cannot access directory */ public boolean isUserLogon(String username, String password) throws Exception { return (UserDirectory.getInstance().isValidPassword(username, password)); // return true; } /** * Login the user. The event is logged if the debug level is >= * Constants.DEBUG. * * @param mapping * The ActionMapping used to select this instance * @param actionForm * The ActionForm bean for this request (if any) * @param request * The HTTP request we are processing * @param response * The HTTP response we are creating * * @exception IOException * if an input/output error occurs * @exception ServletException * if a servlet exception occurs */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { // Obtain username and password from web tier String username = ((LogonForm) form).getUsername(); String password = ((LogonForm) form).getPassword(); try { this.getConnection(); } catch (Exception e) { // TODO 自動生成された catch ブロック e.printStackTrace(); } // Validate credentials with business tier boolean validated = false; try { validated = isUserLogon(username, password); } catch (Exception ude) { // couldn't connect to user directory ActionErrors errors = new ActionErrors(); errors.add(ActionErrors.GLOBAL_MESSAGE, new ActionMessage( "error.logon.connect")); saveErrors(request, errors); // return to input page return (new ActionForward(mapping.getInput())); } if (!validated) { // credentials don't match ActionErrors errors = new ActionErrors(); errors.add(ActionErrors.GLOBAL_MESSAGE, new ActionMessage( "error.logon.invalid")); saveErrors(request, errors); // return to input page return (new ActionForward(mapping.getInput())); } // Save our logged-in user in the session, // because we use it again later. HttpSession session = request.getSession(); session.setAttribute(Constants.USER_KEY, form); // Log this event, if appropriate // if (servlet.getDebug() >= Constants.DEBUG) { // StringBuffer message = new StringBuffer("LogonAction: User '"); // message.append(username); // message.append("' logged on in session "); // message.append(session.getId()); // servlet.log(message.toString()); // } // Return success return (mapping.findForward(Constants.SUCCESS)); } public void getConnection() throws Exception{ try { java.sql.Connection con=null; if (con == null) { Context initContext = new InitialContext(); Context envContext = (Context)initContext.lookup("java:/comp/env"); DataSource ds = (DataSource)envContext.lookup("jdbc/orcl"); con = ds.getConnection(); System.out.println("conn is:"+con); } } catch (Exception e) { e.printStackTrace(); } } } // End LogonAction