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 aliPropertiesMap = new HashMap();

/*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 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("*********************\n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("*********************\n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 requestMap = req.getParameterMap();

Map 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;

}

}

5.创建Controller，dao和service

6.创建测试html，运行项目访问测试。

over......