Java 调用支付宝接口

1.注册开发者中心应用登录点击沙箱服务

https://open.alipay.com/platform/developerIndex.htm

2.创建沙箱应用获取APPID和支付宝网关地址(创建设置密钥这里就不说明了)，将公共密钥和私密保存到本地。

3.创建项目结构，设置配置文件

1.下载支付宝SDK文件jar包，讲jar包导入到项目内

2.编写配置信息和Java文件

/********************************************************************************************************************************************************************************************/

* 应用启动加载文件*/

@Component
public class AlipayConfig implements ApplicationListener {
    //保存加载配置参数
    private static Map<String, String> aliPropertiesMap = new HashMap<String, String>();

    /*获取配置参数值*/
    public static String getKey(String key) {
        return aliPropertiesMap.get(key);
    }

    /*监听启动完成，执行配置加载到aliPropertiesMap*/
    public void onApplicationEvent(ApplicationEvent event) {
        if (event instanceof ApplicationReadyEvent) {
            this.init(aliPropertiesMap);//应用启动加载
        }
    }

    /*初始化加载aliPropertiesMap*/
    public void init(Map<String, String> map) {
        // 获得PathMatchingResourcePatternResolver对象
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        try {
            //加载resource文件(也可以加载resources)
            Resource resources = resolver.getResource("classpath:/alipay.properties");
            PropertiesFactoryBean config = new PropertiesFactoryBean();
            config.setLocation(resources);
            config.afterPropertiesSet();
            Properties prop = config.getObject();
            //循环遍历所有得键值对并且存入集合
            for (String key : prop.stringPropertyNames()) {
                map.put(key, (String) prop.get(key));
            }
        } catch (Exception e) {
            new Exception("配置文件加载失败");
        }
    }
}

/********************************************************************************************************************************************************************************************/

4.创建支付工具类

public class PayUtil {


    /**
     * @param outTradeNo  商户订单号，商户网站订单系统中唯一订单号，必填   对应缴费记录的orderNo
     * @param totalAmount 付款金额，必填
     * @param subject     主题
     * @param body        商品描述，可空
     * @return
     */
    public static String alipay(AlipayBean alipayBean) {

        //1、获得初始化的AlipayClient
        AlipayClient alipayClient = new DefaultAlipayClient(
                AlipayConfig.getKey("gatewayUrl"),//支付宝网关
                AlipayConfig.getKey("app_id"),//appid
                AlipayConfig.getKey("merchant_private_key"),//商户私钥
                "json",
                AlipayConfig.getKey("charset"),//字符编码格式
                AlipayConfig.getKey("alipay_public_key"),//支付宝公钥
                AlipayConfig.getKey("sign_type")//签名方式
        );


        //设置请求参数
        AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
        alipayRequest.setReturnUrl(AlipayConfig.getKey("return_url"));
        alipayRequest.setNotifyUrl(AlipayConfig.getKey("notify_url"));
        try {
            alipayRequest.setBizContent(JSON.toJSONString(alipayBean));

            //请求
            String result = alipayClient.pageExecute(alipayRequest).getBody();
            System.out.println("*********************
返回结果为：" + result);
            return result;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 支付宝退款接口
     *
     * @param outTradeNo
     * @param tradeNo
     * @param refundAmount
     * @param refundReason
     * @param out_request_no 标识一次退款请求，同一笔交易多次退款需要保证唯一，如需部分退款，则此参数必传
     * @return
     */
    public static String aliRefund(AlipayBean alipayBean) {

        //1、获得初始化的AlipayClient
        AlipayClient alipayClient = new DefaultAlipayClient(
                AlipayConfig.getKey("gatewayUrl"),//支付宝网关
                AlipayConfig.getKey("app_id"),//appid
                AlipayConfig.getKey("merchant_private_key"),//商户私钥
                "json",
                AlipayConfig.getKey("charset"),//字符编码格式
                AlipayConfig.getKey("alipay_public_key"),//支付宝公钥
                AlipayConfig.getKey("sign_type")//签名方式
        );

        //设置请求参数
        AlipayTradeRefundRequest alipayRequest = new AlipayTradeRefundRequest();
        alipayRequest.setReturnUrl(AlipayConfig.getKey("return_url"));
        alipayRequest.setNotifyUrl(AlipayConfig.getKey("notify_url"));
        try {
            alipayRequest.setBizContent(JSON.toJSONString(alipayBean));

            //请求
            String result= alipayClient.execute(alipayRequest).getBody();
            System.out.println("*********************
返回结果为：" + result);
            return result;
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 支付宝的验签方法
     *
     * @param req
     * @return
     */
    public static boolean checkSign(HttpServletRequest req) {
        Map<String, String[]> requestMap = req.getParameterMap();
        Map<String, String> paramsMap = new HashMap<>();
        requestMap.forEach((key, values) -> {
            String strs = "";
            for (String value : values) {
                strs = strs + value;
            }
            System.out.println(("key值为" + key + "value为：" + strs));
            paramsMap.put(key, strs);
        });

        //调用SDK验证签名
        try {
            return AlipaySignature.rsaCheckV1(paramsMap, AlipayConfig.getKey("alipay_public_key"), AlipayConfig.getKey("charset"), AlipayConfig.getKey("sign_type"));
        } catch (AlipayApiException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("*********************验签失败********************");
            return false;
        }
    }