Java对接杉德支付银联sdK

首先需要下载杉德支付官方提供的SDK，然后按照官方文档进行集成。以下是一个简单的Java集成杉德银联SDK的示例代码：

1. 添加依赖

<dependency>
    <groupId>com.sand</groupId>
    <artifactId>sandpay-allinpay-sdk</artifactId>
    <version>1.0.0</version>
</dependency>

2. 创建支付请求

// 配置杉德支付接口地址和商户信息
SandPay sandPay = new SandPay.Builder()
        .setSandPayConfig(new SandPayConfig(APP_ID, APP_KEY, "http://localhost:8080"))
        .build();

// 构建支付请求参数
SandPayRequest<PayRequest> request = new SandPayRequest<>();
request.setMethod(Method.PAY);
request.setBizContent(new PayRequest.Builder()
        .setOrderId("1234567890")
        .setTotalAmount(100)
        .setSubject("测试订单")
        .setPayMode(PayMode.SCAN_CODE)
        .setPayExtra("{\"notify_url\":\"http://localhost:8080/notify\"}")
        .build());

// 发送支付请求
SandPayResponse<PayResponse> response = sandPay.execute(request);
if (response.isSuccess()) {
    // 获取支付二维码URL
    String payUrl = response.getBody().getPayUrl();
    System.out.println(payUrl);
} else {
    // 处理错误
    System.out.println(response.getMsg());
}

3. 处理支付回调

// 处理支付回调
@PostMapping("/notify")
public String notify(@RequestBody String requestBody) {
    SandPay sandPay = new SandPay.Builder()
            .setSandPayConfig(new SandPayConfig(APP_ID, APP_KEY, "http://localhost:8080"))
            .build();

    SandPayResponse<PayNotifyResponse> response = sandPay.verifyNotify(requestBody, PayNotifyResponse.class);
    if (response.isSuccess()) {
        // 处理支付成功逻辑
        return "success";
    } else {
        // 处理支付失败逻辑
        return "fail";
    }
}

以上代码仅为示例，具体的集成步骤和细节还需参考杉德支付官方文档。