数据猎手：使用Java和Apache HttpComponents库下载Facebook图像

import org.apache.http.HttpHost;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class FacebookImageDownloader {
    // 爬虫代理加强版***配置信息
    private static final String PROXY_HOST = "www.PROXY.cn";
    private static final int PROXY_PORT = 3128;
    private static final String PROXY_USER = "username";
    private static final String PROXY_PASS = "password";

    public static void main(String[] args) {
        // 配置代理
        HttpHost proxy = new HttpHost(PROXY_HOST, PROXY_PORT);
        RequestConfig config = RequestConfig.custom()
                .setProxy(proxy)
                .build();

        // 创建HttpClient实例
        try (CloseableHttpClient httpClient = HttpClients.custom()
                .setDefaultRequestConfig(config)
                .build()) {

            // 创建线程池
            ExecutorService executorService = Executors.newFixedThreadPool(5);

            // 待下载图像的URL数组
            String[] imageUrls = {
                    "http://www.example.com/image1.jpg",
                    "http://www.example.com/image2.jpg",
                    "http://www.example.com/image3.jpg"
            };

            // 发送请求、处理响应、解析HTML、下载图像
            for (String imageUrl : imageUrls) {
                executorService.execute(() -> {
                    try {
                        // 发送请求
                        HttpGet request = new HttpGet(imageUrl);
                        CloseableHttpResponse response = httpClient.execute(request);

                        // 处理响应
                        if (response.getStatusLine().getStatusCode() == 200) {
                            // 解析HTML（如果需要的话）

                            // 下载图像
                            byte[] imageData = EntityUtils.toByteArray(response.getEntity());
                            File destinationFile = new File("C:\\Downloads\\" + getImageName(imageUrl));
                            FileOutputStream fos = new FileOutputStream(destinationFile);
                            fos.write(imageData);
                            fos.close();
                            System.out.println("图像下载完成，保存到：" + destinationFile.getAbsolutePath());
                        } else {
                            System.err.println("图像下载失败：" + response.getStatusLine());
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                });
            }

            // 关闭线程池
            executorService.shutdown();

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

    // 从URL中获取图像文件名
    private static String getImageName(String imageUrl) {
        int lastIndexOfSlash = imageUrl.lastIndexOf('/');
        return imageUrl.substring(lastIndexOfSlash + 1);
    }
}