java ssm 框架 json问题

前端代码，data为json格式如下：

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'; -webkit-text-stroke: #000000}span.s1 {font-kerning: none}
[{"d":"adfsadfsdfsda","url":"www","md5":"0000"},
{"d":"aa","url":"www","md5":"111"}]

提交

$.ajax({                    type:"POST",                    url:"script/fileAction.action",                    dataType:"json",                    contentType:"application/json",                    data:Data,                    success:function(data){                        $.messager.show({title:"提示",msg:JSON.stringify(data)});                    }                });

后端，不需要解码直接接受

    @RequestMapping("/file")    @ResponseBody    public SimpleResult fileAction(@RequestBody String Str, HttpServletRequest request){        LOGGER.info("==="+Str);        JSONArray json = JSONArray.fromObject(Str);//userStr是json字符串        List<T> scriptFileActionList= 

(List<T>)JSONArray.toCollection(json, T.class);

}

后端将字符串转换成List对象