It seems that they're trying:
"Calls for beefing up security at schools are nothing new. They were initially ordered by the central government in 2004 following an attack that year that left nine students dead at a Beijing school. Since 2006, schools have been required to register or inspect all visitors.
According to news reports, the latest attacks have prompted schools in various parts of the country to take action. In a district of southern Nanjing City, guards will be armed from Saturday with police batons and pepper spray. In Beijing's Xicheng district, guards at kindergarten, elementary and middle schools have been given long-handled metal restraint poles with a hook on the end. In eastern Jinan city, police posts are being built on elementary and middle schools' campuses."
Yes, it's a very sad commentary on our times that schools are no longer safe places.