1.加载servlet容器

不能使用main方法直接调用

  public static boolean httpDownload(String httpUrl, String saveFile) {
        // 1.下载网络文件
        int byteRead;
        URL url;
        try {
            url = new URL(httpUrl);
        } catch (MalformedURLException e1) {
            e1.printStackTrace();
            return false;
        }
 
        try {
            //2.获取链接
            URLConnection conn = url.openConnection();
            //3.输入流
            InputStream inStream = conn.getInputStream();
            //3.写入文件
            FileOutputStream fs = new FileOutputStream(saveFile);
 
            byte[] buffer = new byte[1024];
            while ((byteRead = inStream.read(buffer)) != -1) {
                fs.write(buffer, 0, byteRead);
            }
            inStream.close();
            fs.close();
            return true;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return false;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
    }
 
 
    @Test
    public void httpDownload() {
        httpDownload("video.zhihuishu/zhs/ablmons/demo/202206/dddee1c446314b84a26c74a8def3c3c7.mp4","E:\\test/22.mp4");
    }

2.添mon-io依赖

import org.apachemons.io.FileUtils;
 
import java.io.File;
import java.net.URL;
 
public class TestDownloadFile {
 
    public static void main(String[] args) throws Exception{
        String urlStr = "https://img2022blogs/i-beta/1278703/202211/1278703-20221128121650595-812419505.png";
        URL url = new URL(urlStr);
        String tempFileName = "E://a.png";
        File temp = new File(tempFileName);
        FileUtils.copyURLToFile(url, temp);
    }
}