cmsdisplayresource.java

找了很久才找到到源代码

                    new StringBuffer("attachment; filename=\"").append(resourceStr).append("\"").toString());
                res.setContentLength(result.length);

                CmsFlexController controller = CmsFlexController.getController(req);
                res = controller.getTopResponse();
                res.setContentType(contentType);

                try {
                    res.getOutputStream().write(result);
                    res.getOutputStream().flush();
                } catch (IOException e) {
                    // can usually be ignored
                    if (LOG.isInfoEnabled()) {
                        LOG.info(e.getLocalizedMessage());
                    }
                    return;
                }
            }
        } else {

            // manual existsResource, need it for timewarp checking and saves three calls for existsResource
            CmsResource resource = null;
            try {
                resource = getCms().readResource(resourceStr, CmsResourceFilter.ALL);
            } catch (CmsVfsResourceNotFoundException e) {
                // ignore, resource will be null
            }

            if (resource != null) {
                if (resource.getState().isDeleted()) {
                    // resource has been deleted in offline project
                    throw new CmsVfsResourceNotFoundException(Messages.get().container(
                        Messages.ERR_RESOURCE_DELETED_2,
                        resourceStr,
                        getCms().getRequestContext().currentProject().getName()));
                }

                // check for release / expiration time window 
                autoTimeWarp(resource);

                // code for display resource after all tests for displayability (exists, not deleted)
                String url = getJsp().link(resourceStr);
                // if in online project
                if ((url.indexOf("://") < 0) && getCms().getRequestContext().currentProject().isOnlineProject()) {
                    String site = getCms().getRequestContext().getSiteRoot();
                    if (CmsStringUtil.isEmptyOrWhitespaceOnly(site)) {
                        site = OpenCms.getSiteManager().getDefaultUri();
                        if (CmsStringUtil.isEmptyOrWhitespaceOnly(site)) {
                            url = OpenCms.getSiteManager().getWorkplaceServer() + url;
                        } else if (OpenCms.getSiteManager().getSiteForSiteRoot(site) == null) {
                            url = OpenCms.getSiteManager().getWorkplaceServer() + url;
                        } else {
                            url = OpenCms.getSiteManager().getSiteForSiteRoot(site).getUrl() + url;
                        }
                    } else {
                        url = OpenCms.getSiteManager().getSiteForSiteRoot(site).getUrl() + url;
                    }
                    try {
                        CmsStaticExportManager manager = OpenCms.getStaticExportManager();
                        HttpURLConnection.setFollowRedirects(false);
                        // try to export it
                        URL exportUrl = new URL(manager.getExportUrl() + manager.getRfsName(getCms(), resourceStr));
                        HttpURLConnection urlcon = (HttpURLConnection)exportUrl.openConnection();
                        // setup the connection and request the resource
                        urlcon.setRequestMethod("GET");
                        urlcon.setRequestProperty(CmsRequestUtil.HEADER_OPENCMS_EXPORT, Boolean.TRUE.toString());
                        if (manager.getAcceptLanguageHeader() != null) {
                            urlcon.setRequestProperty(
                                CmsRequestUtil.HEADER_ACCEPT_LANGUAGE,
                                manager.getAcceptLanguageHeader());
                        } else {
                            urlcon.setRequestProperty(
                                CmsRequestUtil.HEADER_ACCEPT_LANGUAGE,
                                manager.getDefaultAcceptLanguageHeader());
                        }
                        if (manager.getAcceptCharsetHeader() != null) {
                            urlcon.setRequestProperty(
                                CmsRequestUtil.HEADER_ACCEPT_CHARSET,
                                manager.getAcceptCharsetHeader());
                        } else {
                            urlcon.setRequestProperty(
                                CmsRequestUtil.HEADER_ACCEPT_CHARSET,
                                manager.getDefaultAcceptCharsetHeader());
                        }
                        // now perform the request to export
                        urlcon.connect();
                        urlcon.getResponseCode();
                        urlcon.disconnect();

                    } catch (Exception e) {
                        // ignore
                        if (LOG.isDebugEnabled()) {
                            LOG.debug(e.getLocalizedMessage(), e);
                        }
                    }
                }
                getJsp().getResponse().sendRedirect(url);
            } else {
                // resource does not exist, show error message
                throw new CmsVfsResourceNotFoundException(Messages.get().container(
                    Messages.ERR_RESOURCE_DOES_NOT_EXIST_3,
                    resourceStr,
                    getCms().getRequestContext().currentProject().getName(),
                    getCms().getRequestContext().getSiteRoot()));
            }
        }
    }

    /**
     * Returns the version number parameter value.<p>
     *
     * @return the version number parameter value
     */
    public String getParamVersion() {

        return m_paramVersion;
    }

    /**
     * Sets the version number parameter value.<p>
     *
     * @param paramVersion the version number parameter value to set
     */
    public void setParamVersionid(String paramVersion) {

        m_paramVersion = paramVersion;
    }

    /**
     * Performs a timewarp for resources that are expired or not released yet to always allow a
     * preview of a page out of the workplace.<p>
     *
     * If the user has a configured timewarp (preferences dialog) a mandatory timewarp will lead to 
     * an exception. One cannot auto timewarp with configured timewarp time.<p>
     * 
     * @param resource the resource to show
     * 
     * @throws CmsVfsResourceNotFoundException if a warp would be needed to show the resource but the user has a configured
     *      timewarp which disallows auto warping
     */
    protected void autoTimeWarp(CmsResource resource) throws CmsVfsResourceNotFoundException {

        long surfTime = getCms().getRequestContext().getRequestTime();
        if (resource.isReleasedAndNotExpired(surfTime)) {
            // resource is valid, no modification of time required
            return;
        }

        if (getSettings().getUserSettings().getTimeWarp() == CmsContextInfo.CURRENT_TIME) {
            // no time warp has been set, enable auto time warp
            long timeWarp;
            // will also work if ATTRIBUTE_REQUEST_TIME was CmsResource.DATE_RELEASED_EXPIRED_IGNORE
            if (resource.isExpired(surfTime)) {
                // do a time warp into the past
                timeWarp = resource.getDateExpired() - 1;
            } else if (!resource.isReleased(surfTime)) {
                // do a time warp into the future
                timeWarp = resource.getDateReleased() + 1;
            } else {
                // do no time warp
                timeWarp = CmsContextInfo.CURRENT_TIME;
            }
            if (timeWarp != CmsContextInfo.CURRENT_TIME) {
                // let's do the time warp again...
                getSession().setAttribute(CmsContextInfo.ATTRIBUTE_REQUEST_TIME, new Long(timeWarp));
            }
        } else {
            // resource is not vaild in the time window set by the user,
            // report an error message
            throw new CmsVfsResourceNotFoundException(Messages.get().container(
                Messages.ERR_RESOURCE_OUTSIDE_TIMEWINDOW_1,
                getParamResource()));
        }
    }

    /**
     * @see org.opencms.workplace.CmsDialog#initWorkplaceRequestValues(org.opencms.workplace.CmsWorkplaceSettings, javax.servlet.http.HttpServletRequest)
     */
    protected void initWorkplaceRequestValues(CmsWorkplaceSettings settings, HttpServletRequest request) {

        fillParamValues(settings, request);
    }
}