savesubscription.gv

struts框架的script版本． 用于学习strust框架

import java.lang.reflect.InvocationTargetException;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.struts.webapp.example.*;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;

form = struts.form;

act = form.getAction();
if (act == null) {
    act = "?";
}

if (log.isDebugEnabled()) {
    log.debug("SaveSubscriptionAction:  Processing " + act +
              " act");
}


// Is there a currently logged on user?
user = session.getAttribute(Constants.USER_KEY);

if (user == null) {
    if (log.isWarnEnabled()) {
        log.warn(" User is not logged on in session "
                  + session.getId());
    }
    struts.setForwardName("logon");
    return;
}

if (struts.action.isCancelled(request)) {
    if (log.isWarnEnabled()) {
        log.warn(" Transact '" + act +
                  "' was cancelled");
    }
    session.removeAttribute(Constants.SUBSCRIPTION_KEY);
    struts.setForwardName("success");
    return;
}


// Is there a related Subscription object?
subscription = session.getAttribute(Constants.SUBSCRIPTION_KEY);
if ("Create".equals(act)) {
    subscription =
        user.createSubscription(request.getParameter("host"));
}
if (subscription == null) {
    if (log.isWarnEnabled()) {
        log.warn(" Missing subscription for user '" +
                  user.getUsername() + "'");
    }
    log.warn("bad request sent");
    response.sendError(HttpServletResponse.SC_BAD_REQUEST,
                       response.getMessage("error.noSubscription"));

}

// Was this transact a Delete?
if (act.equals("Delete")) {
    if (log.isTraceEnabled()) {
        log.trace(" Deleting mail server '" +
                  subscription.getHost() + "' for user '" +
                  user.getUsername() + "'");
    }
    user.removeSubscription(subscription);
    session.removeAttribute(Constants.SUBSCRIPTION_KEY);
    try {
        database = application.getAttribute(Constants.DATABASE_KEY);
        database.save();
    } catch (Exception e) {
        log.error("Database save", e);
    }
    struts.setForwardName("success");
    return;
}

// All required validations were done by the form itself

// Update the persistent subscription information
if (log.isTraceEnabled()) {
    log.trace(" Populating database from form bean");
}
try {
    PropertyUtils.copyProperties(subscription, form);
} catch (InvocationTargetException e) {
    Throwable t = e.getTargetException();
    if (t == null)
        t = e;
    log.error("Subscription.populate", t);
    throw new ServletException("Subscription.populate", t);
} catch (Throwable t) {
    log.error("Subscription.populate", t);
    throw new ServletException("Subscription.populate", t);
}

try {
    database = application.getAttribute(Constants.DATABASE_KEY);
    database.save();
} catch (Exception e) {
    log.error("Database save", e);
}

// Remove the obsolete form bean and current subscription
if (struts.mapping.attribute != null) {
    if ("request".equals(struts.mapping.scope))
        request.removeAttribute(struts.mapping.attribute);
    else
        session.removeAttribute(struts.mapping.attribute);
}
session.removeAttribute(Constants.SUBSCRIPTION_KEY);

// Forward control to the specified success URI
if (log.isTraceEnabled()) {
    log.trace(" Forwarding to success page");
}

struts.setForwardName("success");