AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do","app_id","your private_key","json","GBK","alipay_public_key","RSA2");
KoubeiRetailItemQueryRequest request = new KoubeiRetailItemQueryRequest();
request.setBizContent("{" +
"\"item_id\":\"2015111700076000000003467287\"," +
"\"city_id\":\"900100\"" +
"}");
KoubeiRetailItemQueryResponse response = alipayClient.execute(request);
if(response.isSuccess()){
System.out.println("调用成功");
} else {
System.out.println("调用失败");
}

IAopClient client = new DefaultAopClient("https://openapi.alipay.com/gateway.do", "app_id", "merchant_private_key", "json", "1.0", "RSA2", "alipay_public_key", "GBK", false);
KoubeiRetailItemQueryRequest  request= new KoubeiRetailItemQueryRequest() ;
request.BizContent="{" +
"\"item_id\":\"2015111700076000000003467287\"," +
"\"city_id\":\"900100\"" +
"}";
KoubeiRetailItemQueryResponse response=client.execute(request);
Console.WriteLine(response.Body);

$aop = new AopClient ();
$aop->gatewayUrl = 'https://openapi.alipay.com/gateway.do';
$aop->appId = 'your app_id';
$aop->rsaPrivateKey = '请填写开发者私钥去头去尾去回车，一行字符串';
$aop->alipayrsaPublicKey='请填写支付宝公钥，一行字符串';
$aop->apiVersion = '1.0';
$aop->signType = 'RSA2';
$aop->postCharset='GBK';
$aop->format='json';
$request = new KoubeiRetailItemQueryRequest ();
$request->setBizContent("{" .
"\"item_id\":\"2015111700076000000003467287\"," .
"\"city_id\":\"900100\"" .
"}");
$result = $aop->execute ( $request); 

$responseNode = str_replace(".", "_", $request->getApiMethodName()) . "_response";
$resultCode = $result->$responseNode->code;
if(!empty($resultCode)&&$resultCode == 10000){
echo "成功";
} else {
echo "失败";
}

https://openapi.alipay.com/gateway.do?timestamp=2013-01-01 08:08:08&method=koubei.retail.item.query&app_id=5027&sign_type=RSA2&sign=ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE&version=1.0&biz_content=
  {
"item_id":"2015111700076000000003467287",
"city_id":"900100"
  }

//为确保安全通信，需自行验证响应示例中的sign值是否为蚂蚁金服所提供。

{
	"koubei_retail_item_query_response":{
		"msg":"Success",
		"code":"10000",
		"reduce_to_amount":15,
		"item_id":"2017111010076000000019183770",
		"value_amount":12,
		"title":"单品代金券",
		"item_status":"EFFECTIVE",
		"type":"ALL_CASH",
		"discount_rate":"0.5",
		"descriptions":[
			{
				"details":[
					"领券后10内有效"
				],
				"title":"有效期"
			}
		],
		"cover":"http://dl.django.t.taobao.com/rest/1.0/image?fileIds=8lFHhi8LTFicEOGLq_y5MgAAACMAAQQD",
		"shop_list":[
			"2015112000077000000005528437",
			"2015112000077000000005528438"
		],
		"gmt_start":"2017-01-01 00:00:00",
		"sku_list":[
			"6928804016260",
			"6928804016262"
		],
		"original_amount":100,
		"picture_list":[
			"http://dl.django.t.taobao.com/rest/1.0/image?fileIds=8lFHhi8LTFicEOGLq_y5MgAAACMAAQQD",
			"http://dl.django.t.taobao.com/rest/1.0/ima"
		],
		"gmt_end":"2017-01-01 00:00:00"
	},
	"sign":"ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE"
}

{
	"koubei_retail_item_query_response":{
		"msg":"Service Currently Unavailable",
		"code":"20000",
		"sub_msg":"系统繁忙",
		"sub_code":"isp.unknow-error"
	},
	"sign":"ERITJKEIJKJHKKKKKKKHJEREEEEEEEEEEE"
}