<dependency>
        <groupId>com.alipay.sdk</groupId>
        <artifactId>alipay-sdk-java</artifactId>
        <version>3.4.49.ALL</version>
      </dependency>

 /*********************************************测试 生成支付二维码的URL API*********************************/
    /**
     * 支付订单生成
     * 生成的url转换成二维码,支付宝APP扫一扫支付
     *
     * @param outTradeNo            自有交易单号
     * @param totalAmount           订单金额
     * @return
     */
    public static String testTradeCreate(String outTradeNo,String totalAmount,StringBuilder logger){
        String authCode = "";
        logger.append("-【订单创建-开始】" + lineSeparator);
        AlipayClient alipayClient = getAlipayClient();
        AlipayTradePrecreateRequest alipayTradePrecreateRequest = new AlipayTradePrecreateRequest();

        AlipayTradePrecreateModel alipayTradePrecreateModel = new AlipayTradePrecreateModel();
        alipayTradePrecreateModel.setOutTradeNo(outTradeNo);
        alipayTradePrecreateModel.setTotalAmount(totalAmount);
        alipayTradePrecreateModel.setSubject("test sandbox");
        logger.append("-订单金额: " + totalAmount + lineSeparator);
        try {
            alipayTradePrecreateRequest.setBizModel(alipayTradePrecreateModel);
            AlipayTradePrecreateResponse alipayTradePrecreateResponse = alipayClient.execute(alipayTradePrecreateRequest);
            if (alipayTradePrecreateResponse.isSuccess()){
                authCode = alipayTradePrecreateResponse.getQrCode();
                logger.append("-创建订单成功!支付宝交易号: " + authCode + lineSeparator);
            }else {
                logger.append("-创建订单失败,失败信息: " + alipayTradePrecreateResponse.getMsg() + lineSeparator);
            }
        }catch (Exception e){
            logger.append("-创建支付宝订单异常,异常信息: " + e.getMessage() + lineSeparator);
            //e.printStackTrace();
            return null;
        }finally {
            logger.append("-【订单创建-结束】" + lineSeparator);
        }
        return authCode;
    }

    public static void main(String[] args) {
        String outTradeNo = RandomStringUtils.randomAlphanumeric(32);
        //订单金额
        String totalAmount = "1000";
        //生成订单
        StringBuilder logger = new StringBuilder();
        testTradeCreate(outTradeNo, totalAmount, logger);
        System.out.println(logger.toString());
    }

    public static  AlipayClient getAlipayClient(){
         //参数依次为: String serverUrl, String appId, String privateKey, String format,
         //String charset, String alipayPublicKey, String signType
        AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipaydev.com/gateway.do",
                "2016110200787613",
                "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",
                "json",
                "utf-8",
                "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDIgHnOn7LLILlKETd6BFRJ0GqgS2Y3mn1wMQmyh9zEyWlz5p1zrahRahbXAfCfSqshSNfqOmAQzSHRVjCqjsAw1jyqrXaPdKBmr90DIpIxmIyKXv4GGAkPyJ/6FTFY99uhpiq0qadD/uSzQsefWo0aTvP/65zi3eof7TcZ32oWpwIDAQAB",
                "RSA");
        return alipayClient;
    }

成功响应信息

-【订单创建-开始】
-订单金额: 1000
-创建订单成功!支付宝交易号: https://qr.alipay.com/bax0579001iejvbxmsnz0055
-【订单创建-结束】