@ RequestMapping (value={https://bbs.csdn.net/topics/"/detail/{material_id}/{name}/{type}"}) 
Public String gotodetailpage (@ PathVariable (" material_id ") Integer material_id, @ PathVariable (" name ") String name, @ PathVariable (" type ") String type, the HttpSession session, Model Model) {
Material material=materialservice. SelectById (material_id); 
The String url=material. GetUrl (); 
Session. SetAttribute (" material_id material_id); 
Session. SetAttribute (" url ", url); 
Session. SetAttribute (" name ", name); 
The session. The setAttribute (" type ", type); 
Collection Comments=commentservice. SelectById (material_id); 
Model. The addAttribute (" comments ", comments); 
Return "/detailpage"; 
} 

Later I return "/detailpage" into a station. The HTML page and then use the refresh to jump to detailpage, but such comments are showed out,
Ask everybody to help,