通過使用Java代碼傳遞URL下載文件

Question

我想在java中編寫一個代碼，其中用戶提供一個url鏈接和程序採取url鏈接，並下載一個網頁，因爲它和保存在特定的位置..同樣另存爲...選項在網頁上可用。

請任何人可以幫助我

在此先感謝

Answer 1

您可以使用Java URL API來獲得對URL輸入流然後從中讀出，並通過輸出流上寫入文件。

看到read data from url，Write to file

Answer 2

看一看的HtmlParser。它有一些功能可以幫助您從網頁中提取資源。

Answer 3

//樣品網址：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 { 
     } 
    } 
} 

據工作充分。