java中的mkdir函数

时间:2014-04-05 02:35:39

标签: java web-crawler mkdir

我正在尝试创建一个程序,将资源从网页下载到文件中。我创建了一个mkir函数,它创建了一个目录,其名称是给定String的哈希值的十六进制版本。然后,我创建了一个saveResource函数,它将资源保存在文件中,也保存在字节数组中。但是,当我尝试将资源保存到文件中时,我收到一条错误消息,指出:java.io.FileNotFoundException:648451a1(是一个目录)

以下是功能:

 public static File mkdir(String s) throws IOException
   {
      String dirname = s;
      s = Integer.toHexString(dirname.hashCode());
      File directory = new File(s);

      if  (!directory.exists() && !directory.mkdir())
         throw new IOException("can't make directory for " + s);

      return directory;
   }

public static byte[] saveResource(File dir, String urlString, 
                      String argURLString)
      throws IOException, URISyntaxException
   {
      URL u = new URL(urlString);
      URLConnection uc = u.openConnection();
      urlString = uc.getContentType();
      int contentLength = uc.getContentLength();

      try (InputStream raw = uc.getInputStream()) {
          InputStream in = new BufferedInputStream(raw);

          byte[] data = new byte[contentLength];
          int offset = 0;
          while (offset < contentLength) {
              int bytesRead = in.read(data, offset, data.length - offset);
              if (bytesRead == -1) break;
              offset += bytesRead;
      }
          if (offset != contentLength) {
              throw new IOException("Only read " + offset
                        + " bytes; Expected " + contentLength + " bytes");
          }
          urlString = u.getFile();
          urlString = urlString.substring(urlString.lastIndexOf('/') + 1);
          try (FileOutputStream fout = new FileOutputStream(dir)) {
              fout.write(data);
              fout.flush();
          }
          return data;

      }
      }

1 个答案:

答案 0 :(得分:1)

错误很简单,因为您无法在目录中写入数据。

尝试打印dir.isDirectory()以确认其目录是否正确。由于它是参数的一部分,请检查调用方法。