使用沙箱环境测试支付宝的当面付中的扫码支付 登陆支付宝沙箱环境地址（百度就可以） public static void main(String[] args) throws AlipayApiException { AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipaydev.com/gateway.do", APP_ID, APP_PRIVATE_KEY, "json", CHARSET, ALIPAY_PUBLIC_KEY, "RSA"); //获得初始化的AlipayClient AlipayTradePrecreateRequest request = new AlipayTradePrecreateRequest(); //创建API对应的request类 request.setBizContent("{" + "\"out_trade_no\":\"20150320010101009\"," +