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("http://video.zhihuishu.com/zhs/ablecommons/demo/201806/dddee1c446314b84a26c74a8def3c3c7.mp4","E:\\test/22.mp4"); }
2.添加common-io依赖
import org.apache.commons.io.FileUtils; import java.io.File; import java.net.URL; public class TestDownloadFile { public static void main(String[] args) throws Exception{ String urlStr = "https://img2018.cnblogs.com/i-beta/1278703/201911/1278703-20191128121650595-812419505.png"; URL url = new URL(urlStr); String tempFileName = "E://a.png"; File temp = new File(tempFileName); FileUtils.copyURLToFile(url, temp); } }
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