Spring 传前台 接受不到信息原因

public class AController {

@RequestMapping("/ago")

public ModelAndView ad( Avo b ) throws Exception{

ModelAndView mv = new ModelAndView("b");

//mv.addObject("a", "name");

//mv.setViewName("b");

System.out.println(b.getName());

return mv;

}

此处必须相同 后面那个小写