QT/WebKit::Enable HTML5 Cache

QtWebKit provides support for features specified in HTML5 that improve the performance and capabilities of Web applications. These include client-side (offline) storage and the use of a Web application cache.

Client-side (offline) storage is an improvement over the use of cookies to store persistent data in Web applications.

QT默认是不支持这些的，需要自己添加相应的代码.以demos/browser为例，在browserapplication.cpp中的loadSettings函数中加入如下语句：

defaultSettings->setAttribute(QWebSettings::OfflineStorageDatabaseEnabled,true);
defaultSettings->setAttribute(QWebSettings::OfflineWebApplicationCacheEnabled,true);
defaultSettings->setAttribute(QWebSettings::LocalStorageEnabled,true);
defaultSettings->setOfflineStoragePath("/home/offline1");
defaultSettings->setOfflineWebApplicationCachePath("/home/offline2");
defaultSettings->setLocalStoragePath("/home/offline3");
defaultSettings->setOfflineStorageDefaultQuota(10*1024*1024);
defaultSettings->setOfflineWebApplicationCacheQuota(5*1024*1024);

或者

defaultSettings->setAttribute(QWebSettings::enablePersistentStorage(directory));

This method will simultaneously set and enable the (), (), () and ().

页面设置html5 cache请看http://dev.w3.org/html5/spec/Overview.html#appcache，再将页面放置在tomcat中

再用编译好的browser去访问该页面，接着关闭tomcat服务，在browser中刷新该页面，页面依旧可以显示。不过browser重启后再访问就失效了。在编译QT时应加上database的支持，如-qt-sql-sqlite。