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POBest way to write String to file using java nio
 

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    <p>I need to write(append) huge string to flat file using java nio. The encoding is ISO-8859-1. </p> <p>Currently we are writing as shown below. Is there any <strong>better</strong> way to do the same ?</p> <pre><code>public void writeToFile(Long limit) throws IOException{ String fileName = "/xyz/test.txt"; File file = new File(fileName); FileOutputStream fileOutputStream = new FileOutputStream(file, true); FileChannel fileChannel = fileOutputStream.getChannel(); ByteBuffer byteBuffer = null; String messageToWrite = null; for(int i=1; i&lt;limit; i++){ //messageToWrite = get String Data From database byteBuffer = ByteBuffer.wrap(messageToWrite.getBytes(Charset.forName("ISO-8859-1"))); fileChannel.write(byteBuffer); } fileChannel.close(); } </code></pre> <p>EDIT: Tried both options. Following are the results.</p> <pre><code>@Test public void testWritingStringToFile() { DiagnosticLogControlManagerImpl diagnosticLogControlManagerImpl = new DiagnosticLogControlManagerImpl(); try { File file = diagnosticLogControlManagerImpl.createFile(); long startTime = System.currentTimeMillis(); writeToFileNIOWay(file); //writeToFileIOWay(file); long endTime = System.currentTimeMillis(); System.out.println("Total Time is " + (endTime - startTime)); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * * @param limit * Long * @throws IOException * IOException */ public void writeToFileNIOWay(File file) throws IOException { FileOutputStream fileOutputStream = new FileOutputStream(file, true); FileChannel fileChannel = fileOutputStream.getChannel(); ByteBuffer byteBuffer = null; String messageToWrite = null; for (int i = 1; i &lt; 1000000; i++) { messageToWrite = "This is a test üüüüüüööööö"; byteBuffer = ByteBuffer.wrap(messageToWrite.getBytes(Charset .forName("ISO-8859-1"))); fileChannel.write(byteBuffer); } } /** * * @param limit * Long * @throws IOException * IOException */ public void writeToFileIOWay(File file) throws IOException { FileOutputStream fileOutputStream = new FileOutputStream(file, true); BufferedOutputStream bufferedOutputStream = new BufferedOutputStream( fileOutputStream, 128 * 100); String messageToWrite = null; for (int i = 1; i &lt; 1000000; i++) { messageToWrite = "This is a test üüüüüüööööö"; bufferedOutputStream.write(messageToWrite.getBytes(Charset .forName("ISO-8859-1"))); } bufferedOutputStream.flush(); fileOutputStream.close(); } private File createFile() throws IOException { File file = new File(FILE_PATH + "test_sixth_one.txt"); file.createNewFile(); return file; } </code></pre> <p><strong>Using ByteBuffer and Channel: took 4402 ms</strong></p> <p><strong>Using buffered Writer : Took 563 ms</strong></p>
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    1. COI think there's at least three ways more to write string to text file in Java. Try to search here in SO, there's plenty of answers for your needs :)
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    2. CO@evilone. I understand there are many ways. I didn't want to test all those possible ways and do the profiling and reinvent the wheel, if people have that knowledge and don't mind sharing.
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    3. CO@nobody. What do you mean by "better"? Faster? Cleaner? Personally, I would follow the readability path and go with plain IO [PrintWritter](http://download.oracle.com/javase/6/docs/api/java/io/PrintWriter.html). Why do you want to go with NIO anyway?
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