这是struts自带的一个例子的源程序如下:
package org.apache.struts.webapp.example;
import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;public final class LogoffAction extends Action {
private Log log =
LogFactory.getLog("org.apache.struts.webapp.Example");public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
Locale locale = getLocale(request);
MessageResources messages = getResources(request);
HttpSession session = request.getSession();
User user = (User) session.getAttribute(Constants.USER_KEY);if (user != null) {
if (log.isDebugEnabled()) {
log.debug("LogoffAction: User '" + user.getUsername() +
"' logged off in session " + session.getId());
}
} else {
if (log.isDebugEnabled()) {
log.debug("LogoffActon: User logged off in session " +
session.getId());
}
}
session.removeAttribute(Constants.SUBSCRIPTION_KEY);
session.removeAttribute(Constants.USER_KEY);
session.invalidate();return (mapping.findForward("success")); }
}还有后面的这几个是什么意思?
session.removeAttribute(Constants.SUBSCRIPTION_KEY);
session.removeAttribute(Constants.USER_KEY);
session.invalidate();
package org.apache.struts.webapp.example;
import java.util.Locale;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;public final class LogoffAction extends Action {
private Log log =
LogFactory.getLog("org.apache.struts.webapp.Example");public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
Locale locale = getLocale(request);
MessageResources messages = getResources(request);
HttpSession session = request.getSession();
User user = (User) session.getAttribute(Constants.USER_KEY);if (user != null) {
if (log.isDebugEnabled()) {
log.debug("LogoffAction: User '" + user.getUsername() +
"' logged off in session " + session.getId());
}
} else {
if (log.isDebugEnabled()) {
log.debug("LogoffActon: User logged off in session " +
session.getId());
}
}
session.removeAttribute(Constants.SUBSCRIPTION_KEY);
session.removeAttribute(Constants.USER_KEY);
session.invalidate();return (mapping.findForward("success")); }
}还有后面的这几个是什么意思?
session.removeAttribute(Constants.SUBSCRIPTION_KEY);
session.removeAttribute(Constants.USER_KEY);
session.invalidate();
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