Java后台传前台json数组

function checkStore(){
    var flag=1;
    $.ajax({
            url:"widget?type=shop_cart&ajax=yes&action=checkStore",
            dataType:"json",
            async: false,
            success:function(json){
                userLoad = false;
                json = eval(json.products);
              for(var i=0; i<json.length; i++)
              {  if(!isNaN(json[i])){
                   }else{
                       flag=0;
                   }
                   $("#p"+json[i]).removeClass();
                 $("#"+json[i]).addClass("selected");

              }
            }
        });
        if(flag==0){
            return false;
        }
        else{
            return true;
        }
}

/**
     * 检查产品库存情况，别返回到页面
     */
    private void checkStore(){
        String sessionid =  request.getSession().getId();
        List itemList  = this.cartManager.listGoods(sessionid);
        JSONObject object=new JSONObject();
        List products=new ArrayList();
        for (int i = 0; i < itemList.size(); i++) {
            CartItem c = (CartItem) itemList.get(i);
            Product product = productManager.get(c.getProduct_id());

            if(product.getSpec_num() * c.getNum() > product.getProductStore()){
                products.add("p"+product.getProduct_id());

            }else{
                products.add(product.getProduct_id());
            }

        }
        object.put("products", products);
        this.showJson(object.toString());
    }