多值域动态参数MVC

@RequestMapping("m3")
   public String m3(@RequestParam MultiValueMap<String, String> p){
    Set<String> keys = p.keySet();
    for (String key : keys) {
        List<String> values = p.get(key);
        System.out.println(key);
        for (String value : values) {
            System.out.println(value);
        }
    }

     return "result";