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@RequestMapping(params = "method=del3")
public @ResponseBody Map<String,String> del3(@RequestParam("id") String id, HttpServletResponse response){
Student st = new Student();
st.setId(Integer.valueOf(id));
studentService.delete(st);
Map<String,String> map = new HashMap<String,String>();
map.put("del", "true");
return map;
}