API接口使用全指南：从基础调用到实战技巧

import requests
import hashlib
import time
# 配置信息
APP_KEY = "你的app_key"
APP_SECRET = "你的app_secret"
API_URL = "https://api.example.com/product/get"
PRODUCT_ID = "123456"
# 1. 组装参数
params = {
    "app_key": APP_KEY,
    "timestamp": time.strftime("%Y-%m-%d %H:%M:%S"),
    "product_id": PRODUCT_ID,
    "format": "json"
}
# 2. 生成签名
sorted_params = sorted(params.items(), key=lambda x: x[0])
sign_str = APP_SECRET + "".join([f"{k}{v}" for k, v in sorted_params]) + APP_SECRET
sign = hashlib.md5(sign_str.encode()).hexdigest().upper()
params["sign"] = sign
# 3. 发送GET请求
response = requests.get(API_URL, params=params)
print("响应状态码：", response.status_code)
print("响应数据：", response.json())

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import java.io.IOException;
import java.security.MessageDigest;
import java.util.*;
public class ApiDemo {
    private static final String APP_KEY = "你的app_key";
    private static final String APP_SECRET = "你的app_secret";
    private static final String API_URL = "https://api.example.com/product/get";
    public static void main(String[] args) throws Exception {
        // 1. 组装参数
        Map<String, String> params = new HashMap<>();
        params.put("app_key", APP_KEY);
        params.put("timestamp", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
        params.put("product_id", "123456");
        params.put("format", "json");
        // 2. 生成签名
        List<String> keys = new ArrayList<>(params.keySet());
        Collections.sort(keys);
        StringBuilder signStr = new StringBuilder(APP_SECRET);
        for (String key : keys) {
            signStr.append(key).append(params.get(key));
        }
        signStr.append(APP_SECRET);
        String sign = md5(signStr.toString()).toUpperCase();
        params.put("sign", sign);
        // 3. 构建请求URL
        StringBuilder urlBuilder = new StringBuilder(API_URL).append("?");
        for (Map.Entry<String, String> entry : params.entrySet()) {
            urlBuilder.append(entry.getKey()).append("=")
                     .append(java.net.URLEncoder.encode(entry.getValue(), "UTF-8")).append("&");
        }
        String url = urlBuilder.substring(0, urlBuilder.length() - 1);
        // 4. 发送请求
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder().url(url).build();
        try (Response response = client.newCall(request).execute()) {
            System.out.println("响应数据：" + response.body().string());
        }
    }
    // MD5加密工具
    private static String md5(String str) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5");
        byte[] bytes = md.digest(str.getBytes("UTF-8"));
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("%02x", b));
        }
        return sb.toString();
    }
}

// 注意：前端直接调用API可能暴露密钥，建议通过后端中转
async function callApi() {
    const APP_KEY = "你的app_key";
    const APP_SECRET = "你的app_secret"; // 生产环境禁止在前端暴露！
    const API_URL = "https://api.example.com/product/get";
    const productId = "123456";
    const timestamp = new Date().toISOString().slice(0, 19).replace("T", " ");
    // 1. 组装并排序参数
    const params = { app_key: APP_KEY, timestamp, product_id: productId, format: "json" };
    const sortedKeys = Object.keys(params).sort();
    let signStr = APP_SECRET;
    sortedKeys.forEach(key => signStr += key + params[key]);
    signStr += APP_SECRET;
    // 2. 生成签名（简化版MD5，实际需使用标准库）
    const sign = btoa(signStr).toUpperCase(); // 示例，实际需用MD5算法
    params.sign = sign;
    // 3. 发送请求（需后端允许跨域）
    const queryString = new URLSearchParams(params).toString();
    const response = await fetch(`${API_URL}?${queryString}`);
    const data = await response.json();
    console.log("响应数据：", data);
}
callApi();

# 接前面Python代码
result = response.json()
if response.status_code == 200:
    if result.get("success"):
        # 处理业务数据
        product_data = result["data"]
        print(f"商品名称：{product_data['name']}")
    else:
        # 处理业务错误
        print(f"业务错误：{result['error_msg']}（错误码：{result['error_code']}）")
else:
    # 处理HTTP错误
    print(f"请求失败：状态码{response.status_code}")