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POHow to manage streams of bytes and when to close the streams
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  1. POHow to manage streams of bytes and when to close the streams
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    copied!<p>I'm experiencing java.lang.OutOfMemoryError: Java heap space whenever I try to execute my code. However, if I close my streams in certain instances the error goes away, but because my streams are closing prematurely I'm missing data.</p> <p>I'm very new to Java and I'm clearly not understanding how to manage the streams. How and when should I close streams?</p> <pre><code>private void handleFile(File source) { FileInputStream fis = null; try { if(source.isFile()) { fis = new FileInputStream(source); handleFile(source.getAbsolutePath(), fis); } else if(source.isDirectory()) { for(File file:source.listFiles()) { if(file.isFile()) { fis = new FileInputStream(file); handleFile(file, fis); } else { handleFile(file); } } } } catch(IOException ioe) { ioe.printStackTrace(); } finally { try { if(fis != null) { fis.close(); } } catch(IOException ioe) { ioe.printStackTrace(); } } } private handleFile(String fileName, InputStream inputStream) { try { byte[] initialBytes = isToByteArray(inputStream); byte[] finalBytes = initialBytes; if(initialBytes.length == 0) return; if(isBytesTypeB(initialBytes)) { finalBytes = getBytesTypeB(startingBytes); } // Other similar method checks // ..... map.put(fileName, finalBytes); } catch(IOException ioe) { ioe.printStackTrace(); } } private byte[] isToByteArray(InputStream inputStream) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int nRead; while((nRead = inputStream.read(buffer)) != -1) { baos.write(buffer, 0, nRead); } return baos.toByteArray(); } private boolean isBytesTypeB(byte[] fileBytes) { // Checks if these bytes match a particular type if(BytesMatcher.matches(fileBytes, fileBytes.length)) { return true; } return false; } private byte[] getBytesTypeB(byte[] fileBytes) { //decompress bytes return decompressedBytes; } </code></pre>
 

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