SpringMVC接收前台传递过来的值的实例

@RequestMapping(value="/index1")
public String helloaction1(HttpServletRequest request){
  System.out.println(request.getParameter("nnn")); //获得前台name为nnn的元素的值
  return "index";
}

@RequestMapping(value="/index1")
public String helloaction1(String nnn){  //这里名字要与前端元素名字一致才能获得
  System.out.println(nnn); 
  return "index";
}

@RequestMapping(value="/index")
public String helloaction(@RequestParam(value="nnn",required=false)String nnn1, Model model){ //nnn要与前端一致，在此处可以理解为参数nnn1的别名
  System.out.println(nnn1);
  model.addAttribute("hello", "这是用action传过来的值："+nnn1);
  return "index";
}

@RequestMapping(value="/index2")
public String helloaction2(User user){  
  System.out.println(user.getAccount());
  System.out.println(user.getPassword());
  return "index";
}