Java:
下载网页

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

public class WebPageDownloader {
    public static void main(String[] args) {
        String webUrl = "http://www.example.com";
        try (BufferedInputStream in = new BufferedInputStream(new URL(webUrl).openStream());
             FileOutputStream fileOutputStream = new FileOutputStream("downloaded_page.html")) {
            byte dataBuffer[] = new byte[1024];
            int bytesRead;
            while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) {
                fileOutputStream.write(dataBuffer, 0, bytesRead);
            }
            System.out.println("下载完成。文件保存在 downloaded_page.html.");
        } catch (IOException e) {
            System.out.println("发生错误：" + e.getMessage());
        }
    }
}