Java 爬虫实战：API 商品数据接口调用

import java.net.HttpURLConnection;import java.net.URL;import java.io.BufferedReader;import java.io.InputStreamReader;import org.json.JSONObject;
public class APICrawler {    public static void main(String[] args) throws Exception {        // 定义API接口URL和参数        String apiUrl = "http://api.example.com/products?id=123";        // 发送GET请求        URL url = new URL(apiUrl);        HttpURLConnection con = (HttpURLConnection) url.openConnection();        con.setRequestMethod("GET");        // 获取响应码和内容        int responseCode = con.getResponseCode();        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));        String inputLine;        StringBuilder content = new StringBuilder();        while ((inputLine = in.readLine()) != null) {            content.append(inputLine);        }        in.close();        // 解析JSON数据        JSONObject jsonObj = new JSONObject(content.toString());        String productName = jsonObj.getString("name");        double price = jsonObj.getDouble("price");        int stock = jsonObj.getInt("stock");        // 打印商品信息        System.out.println("Product Name: " + productName);        System.out.println("Price: " + price);        System.out.println("Stock: " + stock);    }}