java 对接银盛支付代码

以下是Java代码示例，用于对接银盛支付：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class YinshengPay {

    // 银盛支付API地址
    private static final String API_URL = "https://api.ysepay.com/gateway/api/directPay";

    // 商户号和API密钥
    private static final String MERCHANT_ID = "your_merchant_id";
    private static final String API_KEY = "your_api_key";

    public static void main(String[] args) throws Exception {
        // 构造请求参数
        Map<String, String> params = new HashMap<String, String>();
        params.put("version", "1.0");
        params.put("merchantId", MERCHANT_ID);
        params.put("orderNo", "your_order_no");
        params.put("orderAmount", "100.00");
        params.put("orderCurrency", "CNY");
        params.put("orderDatetime", "20210813120000");
        params.put("productName", "your_product_name");
        params.put("productDesc", "your_product_desc");
        params.put("payType", "1");
        params.put("bankCode", "ICBC");
        params.put("cardType", "1");
        params.put("cardNo", "your_card_no");
        params.put("cardExpire", "202212");
        params.put("cardCvv", "123");
        params.put("notifyUrl", "your_notify_url");
        params.put("signType", "MD5");

        // 生成签名
        String sign = generateSign(params, API_KEY);
        params.put("signMsg", sign);

        // 发送请求
        String response = sendRequest(API_URL, params);

        // 解析响应结果
        System.out.println(response);
    }

    /**
     * 生成签名
     */
    private static String generateSign(Map<String, String> params, String apiKey) throws Exception {
        StringBuilder sb = new StringBuilder();
        sb.append(apiKey);
        Iterator<String> it = params.keySet().iterator();
        while (it.hasNext()) {
            String key = it.next();
            String value = params.get(key);
            sb.append(key).append("=").append(value).append("&");
        }
        sb.deleteCharAt(sb.length() - 1);
        String sign = MD5(sb.toString()).toUpperCase();
        return sign;
    }

    /**
     * 发送请求
     */
    private static String sendRequest(String url, Map<String, String> params) throws Exception {
        HttpURLConnection conn = null;
        OutputStreamWriter osw = null;
        BufferedReader br = null;
        try {
            URL u = new URL(url);
            conn = (HttpURLConnection) u.openConnection();
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setRequestMethod("POST");
            conn.setUseCaches(false);
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(5000);
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            osw = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            osw.write(getRequestData(params));
            osw.flush();

            br = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line).append("\n");
            }
            return sb.toString();
        } finally {
            if (osw != null) {
                osw.close();
            }
            if (br != null) {
                br.close();
            }
            if (conn != null) {
                conn.disconnect();
            }
        }
    }

    /**
     * 构造请求数据
     */
    private static String getRequestData(Map<String, String> params) throws Exception {
        StringBuilder sb = new StringBuilder();
        Iterator<String> it = params.keySet().iterator();
        while (it.hasNext()) {
            String key = it.next();
            String value = params.get(key);
            sb.append(key).append("=").append(URLEncoder.encode(value, "UTF-8")).append("&");
        }
        sb.deleteCharAt(sb.length() - 1);
        return sb.toString();
    }

    /**
     * 计算MD5摘要
     */
    private static String MD5(String s) throws Exception {
        java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
        byte[] array = md.digest(s.getBytes("UTF-8"));
        StringBuilder sb = new StringBuilder();
        for (byte b : array) {
            sb.append(Integer.toHexString((b & 0xFF) | 0x100).substring(1, 3));
        }
        return sb.toString();
    }

}

上面的代码中，需要替换掉示例中的商户号、API密钥、订单号、金额、商品名称、商品描述、银行卡信息等参数。发送请求和解析响应的代码也需要根据具体的业务进行修改。