spring boot集成rsa2

Spring Boot 集成 RSA2 可以参考以下步骤：

1. 引入 RSA2 的依赖包

<dependency>
    <groupId>com.alipay.sdk</groupId>
    <artifactId>alipay-sdk-java</artifactId>
    <version>4.9.19.ALL</version>
</dependency>

2. 在配置文件中配置 RSA2 的公钥和私钥

# RSA2 公钥
alipay.publicKey=

# RSA2 私钥
alipay.privateKey=

3. 创建 RSA2 工具类

import com.alipay.api.AlipayApiException;
import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.request.AlipayTradeAppPayRequest;
import com.alipay.api.response.AlipayTradeAppPayResponse;

public class AlipayUtil {
    private static final String CHARSET = "UTF-8";
    private static final String SIGN_TYPE = "RSA2";
    private static final String FORMAT = "JSON";

    private static String appId;
    private static String privateKey;
    private static String publicKey;

    public static void setAppId(String appId) {
        AlipayUtil.appId = appId;
    }

    public static void setPrivateKey(String privateKey) {
        AlipayUtil.privateKey = privateKey;
    }

    public static void setPublicKey(String publicKey) {
        AlipayUtil.publicKey = publicKey;
    }

    public static String generateOrder(String subject, String body, String outTradeNo, String totalAmount, String notifyUrl) throws AlipayApiException {
        AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do", appId, privateKey, FORMAT, CHARSET, publicKey, SIGN_TYPE);

        AlipayTradeAppPayRequest request = new AlipayTradeAppPayRequest();
        request.setBizContent("{" +
                "    \"subject\":\"" + subject + "\"," +
                "    \"body\":\"" + body + "\"," +
                "    \"out_trade_no\":\"" + outTradeNo + "\"," +
                "    \"timeout_express\":\"30m\"," +
                "    \"total_amount\":\"" + totalAmount + "\"," +
                "    \"product_code\":\"QUICK_MSECURITY_PAY\"" +
                "  }");
        request.setNotifyUrl(notifyUrl);

        AlipayTradeAppPayResponse response = alipayClient.sdkExecute(request);
        return response.getBody();
    }
}

4. 在需要使用 RSA2 的地方调用工具类进行支付

try {
    String orderString = AlipayUtil.generateOrder("测试商品", "测试商品描述", "123456789", "0.01", "http://xxxxx");
    // 将订单字符串返回给前端，前端使用支付宝SDK进行支付
} catch (AlipayApiException e) {
    e.printStackTrace();
}

注意，RSA2 的公钥和私钥是一对，需要同时配置。另外，生成订单字符串后需要将其返回给前端使用支付宝SDK进行支付。