简易的组装Json工具类
// 设置业务参数
aliPayRequest.setBizContent("{" +
" \"out_trade_no\":\"" + orderInfoId + "\"," +
" \"total_amount\":\"" + retainage + "\"," +
" \"subject\":\"" + orderInfoNum + "\"," +
" \"store_id\":\"" + ALI_PAY_STORE_ID + "\"," +
<