LifeTime动作类Struts1.3.10

Question

扩展Action的类的生存期是多少(Struts 1.3.10)？

public class AddProcessAction extends Action {

    ProcBox procBox = new ProcBox();

    @Override
    public ActionForward execute(ActionMapping mapping,
                                 ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) throws Exception {
        procBox.addToProcBox((ProcessForm)form);
        return mapping.findForward("success");
    }
}

Answer 1

Struts 1.x操作是单个的，并且是应用程序生命周期的最后一步。

因此，它们必须是重新进入和线程安全。

除非您只有一个用户，否则上面的示例将无法正常工作。

需要创建ProcBox实例变量并将其存储在HttpSession中，这对于每个客户端都是唯一的。你可以使用这样的东西：

public class AddProcessAction extends Action {

    private static final String PROC_BOX_SESSION_ATTR = "addProcessAction.procBox";

    @Override
    public ActionForward execute(ActionMapping mapping, 
                                 ActionForm form, 
                                 HttpServletRequest request,
                                 HttpServletResponse response) throws Exception {
        final procBox = acquireProcBoxFrom(request);
        procBox.addToProcBox((ProcessForm)form);
        return mapping.findForward("success");
    }

    private ProcBox acquireProcBoxFrom(HttpServletRequest request) {
        final HttpSession httpSession = request.getSession();
        ProcBox procBox = (ProcBox)httpSession.getAttribute(PROC_BOX_SESSION_ATTR);
        if (procBox == null) {
            procBox = new ProcBox();
            httpSession.setAttribute(PROC_BOX_SESSION_ATTR, procBox);
        }
        return procBox;
    }

}