生成一个接口调用的java代码 四个参数AccessKey ,sign,timestamp,nonce的参数位置是QUERY HEADER是hsPartyId body是json

下面是一个简单的示例代码，用于调用一个API，其中AccessKey、sign、timestamp和nonce作为查询参数，hsPartyId作为标头，JSON作为请求正文：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class ApiCaller {

    private static final String API_URL = "https://example.com/api";

    private static final String ACCESS_KEY = "my_access_key";
    private static final String SECRET_KEY = "my_secret_key";
    private static final String HS_PARTY_ID = "my_hs_party_id";

    public static void main(String[] args) throws Exception {
        String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
        String nonce = generateNonce();

        // 构造查询参数
        Map<String, String> queryParams = new HashMap<>();
        queryParams.put("AccessKey", ACCESS_KEY);
        queryParams.put("sign", generateSign(SECRET_KEY, timestamp, nonce));
        queryParams.put("timestamp", timestamp);
        queryParams.put("nonce", nonce);

        // 构造标头
        Map<String, String> headers = new HashMap<>();
        headers.put("hsPartyId", HS_PARTY_ID);

        // 构造请求正文
        String requestBody = "{\"key\":\"value\"}";

        // 发送请求
        String response = sendGetRequest(API_URL, queryParams, headers, requestBody);

        // 处理响应
        System.out.println(response);
    }

    private static String sendGetRequest(String url, Map<String, String> queryParams, Map<String, String> headers, String requestBody) throws Exception {
        StringBuilder sb = new StringBuilder(url);
        if (!queryParams.isEmpty()) {
            sb.append('?');
            for (Map.Entry<String, String> entry : queryParams.entrySet()) {
                sb.append(entry.getKey()).append('=').append(entry.getValue()).append('&');
            }
            sb.deleteCharAt(sb.length() - 1);
        }

        HttpURLConnection conn = (HttpURLConnection) new URL(sb.toString()).openConnection();
        conn.setRequestMethod("GET");
        for (Map.Entry<String, String> entry : headers.entrySet()) {
            conn.setRequestProperty(entry.getKey(), entry.getValue());
        }

        if (requestBody != null && !requestBody.isEmpty()) {
            conn.setDoOutput(true);
            conn.getOutputStream().write(requestBody.getBytes());
        }

        BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        StringBuilder response = new StringBuilder();
        String line;
        while ((line = reader.readLine()) != null) {
            response.append(line);
        }
        reader.close();
        conn.disconnect();

        return response.toString();
    }

    private static String generateSign(String secretKey, String timestamp, String nonce) throws Exception {
        String message = timestamp + nonce;
        SecretKeySpec keySpec = new SecretKeySpec(secretKey.getBytes("UTF-8"), "HmacSHA256");
        Mac mac = Mac.getInstance("HmacSHA256");
        mac.init(keySpec);
        byte[] rawHmac = mac.doFinal(message.getBytes("UTF-8"));
        return Base64.encodeBase64String(rawHmac);
    }

    private static String generateNonce() {
        return String.valueOf(new Random().nextInt(1000000));
    }

}