java 获取url返回结果中的Cookie

import java.io.*;
import java.net.*;

public class CookieExtractor {

    public static void main(String[] args) {
        try {
            // 创建URL对象
            URL url = new URL("http://example.com");

            // 打开连接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();

            // 发送GET请求
            conn.setRequestMethod("GET");

            // 获取返回的Cookie
            String cookie = conn.getHeaderField("Set-Cookie");
            // 打印输出Cookie
            System.out.println("Cookie: " + cookie);
            // 将Cookie写入到文件中
            FileWriter writer = new FileWriter("cookie.txt");
            writer.write(cookie);
            writer.close();

            System.out.println("Cookie保存成功");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}