@RequestMapping("alipaytopay")

public void Alipay(HttpServletRequest request) throws Exception {

//获得初始化的AlipayClient

AlipayClient alipayClient = new DefaultAlipayClient(PaymentUtils.gatewayUrl, PaymentUtils.app_id, PaymentUtils.merchant_private_key, "json", PaymentUtils.charset, PaymentUtils.alipay_public_key, PaymentUtils.sign_type);

//设置请求参数

AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();

alipayRequest.setReturnUrl(PaymentUtils.return_url);

alipayRequest.setNotifyUrl(PaymentUtils.notify_url);

//商户订单号，商户网站订单系统中唯一订单号，必填

String out_trade_no = "2017624155010267";//new String(request.getParameter("WIDout_trade_no").getBytes("ISO-8859-1"),"UTF-8");

//付款金额，必填

String total_amount = "0.01";//new String(request.getParameter("WIDtotal_amount").getBytes("ISO-8859-1"),"UTF-8");

//订单名称，必填

String subject = "测试";//new String(request.getParameter("WIDsubject").getBytes("ISO-8859-1"),"UTF-8");

//商品描述，可空

String body = "";//new String(request.getParameter("WIDbody").getBytes("ISO-8859-1"),"UTF-8");

alipayRequest.setBizContent("{\"out_trade_no\":\""+ out_trade_no +"\","

+ "\"total_amount\":\""+ total_amount +"\","

+ "\"subject\":\""+ subject +"\","

+ "\"body\":\""+ body +"\","

+ "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");

//若想给BizContent增加其他可选请求参数，以增加自定义超时时间参数timeout_express来举例说明

//alipayRequest.setBizContent("{\"out_trade_no\":\""+ out_trade_no +"\","

// + "\"total_amount\":\""+ total_amount +"\","

// + "\"subject\":\""+ subject +"\","

// + "\"body\":\""+ body +"\","

// + "\"timeout_express\":\"10m\","

// + "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");

//请求参数可查阅【电脑网站支付的API文档-alipay.trade.page.pay-请求参数】章节

//请求

alipayClient.pageExecute(alipayRequest).getBody();