通过使用java代码传递URL来下载文件

我正在尝试在java中编写一个代码，用户提供一个url链接，程序采用url链接并按原样下载一个网页并保存在特定位置…同样可以在网页上保存为…选项。

请任何人帮助我

提前致谢

Answer 1

//示例url： http ： //www.novell.com/coolsolutions/tools/downloads/ntradping.zip

import java.io.*; import java.net.*; public class UrlDownload { final static int size = 1024; public static void fileUrl(String fAddress, String localFileName, String destinationDir) { OutputStream outStream = null; URLConnection uCon = null; InputStream is = null; try { URL url; byte[] buf; int byteRead, byteWritten = 0; url = new URL(fAddress); outStream = new BufferedOutputStream(new FileOutputStream(destinationDir + "\\" + localFileName)); uCon = url.openConnection(); is = uCon.getInputStream(); buf = new byte[size]; while ((byteRead = is.read(buf)) != -1) { outStream.write(buf, 0, byteRead); byteWritten += byteRead; } System.out.println("Downloaded Successfully."); System.out.println("File name:\"" + localFileName + "\"\nNo ofbytes :" + byteWritten); } catch (Exception e) { e.printStackTrace(); } finally { try { is.close(); outStream.close(); } catch (IOException e) { e.printStackTrace(); } } } public static void fileDownload(String fAddress, String destinationDir) { int slashIndex = fAddress.lastIndexOf('/'); int periodIndex = fAddress.lastIndexOf('.'); String fileName = fAddress.substring(slashIndex + 1); if (periodIndex >= 1 && slashIndex >= 0 && slashIndex < fAddress.length() - 1) { fileUrl(fAddress, fileName, destinationDir); } else { System.err.println("path or file name."); } } public static void main(String[] args) { if (args.length == 2) { for (int i = 1; i < args.length; i++) { fileDownload(args[i], args[0]); } } else { } } } 

它正在全力以赴。

Answer 2

您可以使用Java URL API在URL上获取输入流，然后从中读取输入流并在文件上写入输出流。

请参阅从URL读取数据 ， 写入文件

Answer 3

看看HtmlParser 。 它有一些function可以帮助您从网页中提取资源。