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POJava - Get metadata of files in a directory with million files in it
 

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  1. POJava - Get metadata of files in a directory with million files in it
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    <p>I am writing a Java app to get the file metadata of files in a directory and exporting it to a csv file. The app works fine if the number of files is less. But if I feed in a path that has like a 320000 files in all of directories and sub-direcories it is taking forever. Is there a way I can speed up things here ? </p> <pre><code> private void extractDetailsCSV(File libSourcePath, String extractFile) throws ScraperException { log.info("Inside extract details csv"); try{ FileMetadataUtil fileUtil = new FileMetadataUtil(); File[] listOfFiles = libSourcePath.listFiles(); for(int i = 0; i &lt; listOfFiles.length; i++) { if(listOfFiles[i].isDirectory()) { extractDetailsCSV(listOfFiles[i],extractFile); } if(listOfFiles[i].isFile()){ ScraperOutputVO so = new ScraperOutputVO(); Path path = Paths.get(listOfFiles[i].getAbsolutePath()); so.setFilePath(listOfFiles[i].getParent()); so.setFileName(listOfFiles[i].getName()); so.setFileType(getFileType(listOfFiles[i].getAbsolutePath())); BasicFileAttributes basicAttribs = fileUtil.getBasicFileAttributes(path); if(basicAttribs != null) { so.setDateCreated(basicAttribs.creationTime().toString().substring(0, 10) + " " + basicAttribs.creationTime().toString().substring(11, 16)); so.setDateLastModified(basicAttribs.lastModifiedTime().toString().substring(0, 10) + " " + basicAttribs.lastModifiedTime().toString().substring(11, 16)); so.setDateLastAccessed(basicAttribs.lastAccessTime().toString().substring(0, 10) + " " + basicAttribs.lastAccessTime().toString().substring(11, 16)); } so.setFileSize(String.valueOf(listOfFiles[i].length())); so.setAuthors(fileUtil.getOwner(path)); so.setFolderLink(listOfFiles[i].getAbsolutePath()); writeCsvFileDtl(extractFile, so); so.setFileName(listOfFiles[i].getName()); noOfFiles ++; } } } catch (Exception e) { log.error("IOException while setting up columns" + e.fillInStackTrace()); throw new ScraperException("IOException while setting up columns" , e.fillInStackTrace()); } log.info("Done extracting details to csv file"); } public void writeCsvFileDtl(String extractFile, ScraperOutputVO scraperOutputVO) throws ScraperException { try { FileWriter writer = new FileWriter(extractFile, true); writer.append(scraperOutputVO.getFilePath()); writer.append(','); writer.append(scraperOutputVO.getFileName()); writer.append(','); writer.append(scraperOutputVO.getFileType()); writer.append(','); writer.append(scraperOutputVO.getDateCreated()); writer.append(','); writer.append(scraperOutputVO.getDateLastModified()); writer.append(','); writer.append(scraperOutputVO.getDateLastAccessed()); writer.append(','); writer.append(scraperOutputVO.getFileSize()); writer.append(','); writer.append(scraperOutputVO.getAuthors()); writer.append(','); writer.append(scraperOutputVO.getFolderLink()); writer.append('\n'); writer.flush(); writer.close(); } catch (IOException e) { log.info("IOException while writing to csv file" + e.fillInStackTrace()); throw new ScraperException("IOException while writing to csv file" , e.fillInStackTrace()); } } </code></pre> <p>}</p>
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    1. COThis would probably be better on [codereview](http://codereview.stackexchange.com) with your code included. No one can help improve performance (or tell you whether it could be improved) without actually seeing your code.
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      1. POJava - Get metadata of files in a directory with million files in it
      1. USMichelle
 

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