java - response.setheader("Refresh", "0") not working -


i trying refresh webpage when user session has expired or connection not active. tried lot of codes didn't seem work. last code used 

if(session.getattribute("connection") != null && !session.getattribute("connection").equals("")){             conn = (dbconnection) session.getattribute("connection");             if(conn == null){                     response.setcontenttype("text/html");                     response.setheader("refresh", "3");                     return;                 }             }else{                 response.setcontenttype("text/html");                 response.setheader("refresh", "3");                 return;             }

i tried response.sendredirect() , request.getrequestdispatcher.forward() didnt work well. servlet being called javascript expects json object.

you cannot directly execute command on client directly servlet. notice http protocol relies on requests client , responses server.

so if no request made client, nothing can send server (simply because server doesn't have request response )

i know have seen functionality , yes can done. not in manner. ajax best bet here... (sending requests @ regular intervals , getting response server etc)


Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

qt - Errors in generated MOC files for QT5 from cmake -

i generated moc files qt5 using set (cmake_automoc on) set(cmake_include_current_dir on) then add moc files src using set(src src/main.cpp src/video_widget_surface.cpp src/video_widget.cpp src/video_player.cpp #moc files moc/moc_video_player.cpp moc/moc_video_widget.cpp moc/moc_video_widget_surface.cpp finally add executable using add_executable(somegui ${src}) but errors in moc files saying : /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:54:6: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:62:19: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:68:20: error: 'videowidget' has not been declared /other/workspace/perception/somestuff/moc/moc_video_widget.cpp:68:46: error: non-member function 'const qmetaobject* metaobject()' cannot have cv-qualifier /other/qt5.0.1/5.0.1/gcc_64/include/qtcore/qo...
Read more