限定某个业务控制方法，只允许GET或POST请求方式访问

@Controller
@RequestMapping(value="/user")
public class UserAction{
    @RequestMapping(value="/add",method=RequestMethod.POST)
    public String add(Model model,int id,String name,double sal) throws Exception{
        System.out.println("HelloAction::add()::POST");
        System.out.println(id + ":" + name + ":" + sal);
        model.addAttribute("message","增加用户");
        return "/success.jsp";
    }    
}