前后端交互json字符串

//将需要的参数转成json字符串，然后用utf-8编码
var obj = encodeURIComponent(JSON.stringify(this.categories),"utf-8")

//后台将前台的json字符串按照utf-8的格式解码，然后进行转换
@RequestMapping(value = "/updateMaterialDemoInfo.do", method = RequestMethod.POST)
    @ResponseBody
    public Map<String, Object> updateMaterialDemoInfo(String obj){

        List<MaterialDemoInfoDTO> list = new ArrayList<MaterialDemoInfoDTO>();
        try {
            String param = URLDecoder.decode(obj,"utf-8");
            list = (List<MaterialDemoInfoDTO>)JSonUtil.json2Obj(param, MaterialDemoInfoDTO.class);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return materialDemoService.updateMaterialDemoInfo(list);
    }

public class MaterialDemoInfoDTO {

    // 主键ID
    private String id;

    //路径
    private String [] path;

    //物资器材模板id
    private String demoId;

    //数量
    private String num;

    //序号
    private String sort;

    //类型备注
    private String remark;