ダウンロードしたファイルをサーバーからJavaに保存する方法

Question

サーバーからファイルをダウンロードするJavaクラスがあります。このファイルのダウンロードとダウンロードは完了しましたが、ローカルシステムに保存されているパスファイルを保存しないと思います。ウィンドウのダウンロードフォルダや他のフォルダに保存する方法を教えてください。

import java.io.*; 
    import java.net.*; 
    import java.util.*; 



    class Download extends Observable implements Runnable { 


    private static final int MAX_BUFFER_SIZE = 1024; 

    public static final String STATUSES[] = {"Downloading", 
     "Paused", "Complete", "Cancelled", "Error"}; 

    public static final int DOWNLOADING = 0; 
    public static final int PAUSED = 1; 
    public static final int COMPLETE = 2; 
    public static final int CANCELLED = 3; 
    public static final int ERROR = 4; 

    private final URL url; // download URL 
    private int size; // size of download in bytes 
    private int downloaded; // number of bytes downloaded 
    private int status; // current status of download 

    public Download(URL url) { 
     this.url = url; 
     size = -1; 
     downloaded = 0; 
     status = DOWNLOADING; 

     // Begin the download. 
     download(); 
    } 

    public String getUrl() { 
     return url.toString(); 
    } 

    public int getSize() { 
     return size; 
    } 

    public float getProgress() { 
     return ((float) downloaded/size) * 100; 
    } 

    public int getStatus() { 
     return status; 
    } 

    public void pause() { 
     status = PAUSED; 
     stateChanged(); 
    } 

    public void resume() { 
     status = DOWNLOADING; 
     stateChanged(); 
     download(); 
    } 

    public void cancel() { 
     status = CANCELLED; 
     stateChanged(); 
    } 

    private void error() { 
     status = ERROR; 
     stateChanged(); 
    } 

    private void download() { 
     Thread thread = new Thread(this); 
     thread.start(); 
    } 

    private String getFileName(URL url) { 
     String fileName = url.getFile(); 
     return fileName.substring(fileName.lastIndexOf('/') + 1); 
    } 

    public void run() { 
     RandomAccessFile file = null; 
     InputStream stream = null; 

     try { 
      // Open connection to URL. 
      HttpURLConnection connection 
        = (HttpURLConnection) url.openConnection(); 

      // Specify what portion of file to download. 
      connection.setRequestProperty("Range", 
        "bytes=" + downloaded + "-"); 

      // Connect to server. 
      connection.connect(); 

      // Make sure response code is in the 200 range. 
      if (connection.getResponseCode()/100 != 2) { 
       error(); 
      } 

      // Check for valid content length. 
      int contentLength = connection.getContentLength(); 
      if (contentLength < 1) { 
       error(); 
      } 

      /* Set the size for this download if it 
    hasn't been already set. */ 
      if (size == -1) { 
       size = contentLength; 
       stateChanged(); 
      } 

      // Open file and seek to the end of it. 
      file = new RandomAccessFile(getFileName(url), "rw"); 
      file.seek(downloaded); 

      stream = connection.getInputStream(); 
      while (status == DOWNLOADING) { 
       /* Size buffer according to how much of the 
     file is left to download. */ 
       byte buffer[]; 
       if (size - downloaded > MAX_BUFFER_SIZE) { 
        buffer = new byte[MAX_BUFFER_SIZE]; 
       } else { 
        buffer = new byte[size - downloaded]; 
       } 

       // Read from server into buffer. 
       int read = stream.read(buffer); 
       if (read == -1) { 
        break; 
       } 

       // Write buffer to file. 
       file.write(buffer, 0, read); 
       downloaded += read; 
       stateChanged(); 
      } 


      /* Change status to complete if this point was 
    reached because downloading has finished. */ 
      if (status == DOWNLOADING) { 
       status = COMPLETE; 
       stateChanged(); 
       System.err.println("cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc"); 
      } 
     } catch (Exception e) { 
      error(); 
     } finally { 
      // Close file. 
      if (file != null) { 
       try { 
        file.close(); 
       } catch (Exception e) { 
       } 
      } 

      // Close connection to server. 
      if (stream != null) { 
       try { 
        stream.close(); 
       } catch (Exception e) { 
       } 
      } 
     } 
    } 

// Notify observers that this download's status has changed. 
    private void stateChanged() { 
     setChanged(); 
     notifyObservers(); 
    } 
} 

Answer 1

あなたはのRandomAccessFile（）を作成すると、最初のパラメータは、ファイルの名前と場所です。 absolutePath（）を印刷して、このファイルがどこに常駐しているかを確認してください。