java实现图片批量下载

Java可以使用HttpURLConnection或者HttpClient来下载图片，以下是一个基本的实现示例：

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class ImageDownloader {

    public static void main(String[] args) {
        List<String> urls = new ArrayList<>();
        // 添加需要下载的图片链接
        urls.add("https://example.com/image1.jpg");
        urls.add("https://example.com/image2.jpg");
        // ...

        for (String url : urls) {
            downloadImage(url);
        }
    }

    private static void downloadImage(String imageUrl) {
        try {
            URL url = new URL(imageUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5 * 1000);

            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                InputStream is = conn.getInputStream();
                BufferedInputStream bis = new BufferedInputStream(is);

                // 从链接中解析出文件名
                String fileName = imageUrl.substring(imageUrl.lastIndexOf("/") + 1);
                File file = new File(fileName);
                FileOutputStream fos = new FileOutputStream(file);

                byte[] buffer = new byte[1024];
                int len;

                while ((len = bis.read(buffer)) != -1) {
                    fos.write(buffer, 0, len);
                }

                fos.close();
                bis.close();
                is.close();

                System.out.println("Downloaded " + fileName);
            } else {
                System.out.println("Failed to download " + imageUrl);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

这个示例将会从`urls`列表中读取需要下载的图片链接，然后逐个下载保存到本地文件。你可以根据自己的需求修改代码。