import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.*;
import java.util.Map;

public class order {
     private static String create_order(String ip, String merchantId, String key, String payWay, String amount)
             throws NoSuchAlgorithmException, InvalidKeyException, IOException {
        // url参数
        Map<String, Object> url_map = new TreeMap<String, Object>();
        url_map.put("merchantId", merchantId);
        url_map.put("signatureMethod", "HmacSHA256");
        url_map.put("signatureVersion", "1");
        url_map.put("timestamp", System.currentTimeMillis());

        // url参数拼接
        StringBuilder url_data = new StringBuilder();
        for (Map.Entry<String, Object> url :url_map.entrySet())  {
            url_data.append(url.getKey()).append("=").append(url.getValue()).append("&");
        }
        url_data = new StringBuilder(url_data.substring(0, url_data.length() - 1));
        // System.out.println(url_data);

        // body参数
        Map<String, Object> body_map = new TreeMap<String, Object>();
        body_map.put("jUserId", "666666");
        body_map.put("jUserIp", "110.110.110.110");
        body_map.put("jOrderId", Long.toString(System.currentTimeMillis()));
        body_map.put("orderType", "1");
        body_map.put("payWay", payWay);
        body_map.put("amount", amount);
        body_map.put("currency", "CNY");
        body_map.put("jUserName", "奥里给");
        body_map.put("notifyUrl", "//test.com");

        // 全部参数
        Map<String, Object> all_map = new TreeMap<String, Object>();
        all_map.putAll(url_map);
        all_map.putAll(body_map);

        // 参数拼接
        StringBuilder all_data = new StringBuilder();
        for (Map.Entry<String, Object> url :all_map.entrySet())  {
            all_data.append(url.getKey()).append("=").append(url.getValue()).append("&");
        }

        all_data = new StringBuilder(all_data.substring(0, all_data.length() - 1));
        //  System.out.println("data：" + all_data);

        // HmacSHA256加密
        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
        SecretKeySpec secret_key = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "HmacSHA256");
        sha256_HMAC.init(secret_key);
        byte[] array = sha256_HMAC.doFinal(all_data.toString().getBytes(StandardCharsets.UTF_8));
        StringBuilder sec = new StringBuilder();
        for (byte item : array) {
            sec.append(Integer.toHexString((item & 0xFF) | 0x100), 1, 3);
        }
        String signature_data = sec.toString().toUpperCase();
        System.out.println("signature：" + signature_data);

        String URL = ip + "?" + url_data + "&signature=" + signature_data;
        System.out.println("url：" + URL);
        HttpPost httppost = new HttpPost(URL);

        // 请求body参数拼接
        StringBuilder list_data = new StringBuilder();
        for (Map.Entry<String, Object> m :body_map.entrySet())  {
            list_data.append(m.getKey()).append("=").append(m.getValue()).append("&");
        }
        list_data = new StringBuilder(list_data.substring(0, list_data.length() - 1));
        System.out.println("data：" + list_data);

        // 创建订单-发送请求
        StringEntity entity = new StringEntity(list_data.toString(), "utf-8");
        entity.setContentEncoding("UTF-8");
        entity.setContentType("application/x-www-form-urlencoded");
        httppost.setEntity(entity);
        HttpClient httpClient = new DefaultHttpClient();
        HttpResponse response = httpClient.execute(httppost);
        String strResult = EntityUtils.toString(response.getEntity());
        System.out.println("result：" + strResult + "\t");
        httppost.releaseConnection();

        return strResult;
     }

    public static void main(String[] args) throws Exception {
        create_order("//test.com", "merchantId",
                    "key", "pay", "666");
    }
}