byte to file in Java

Question

With Java   I have a byte   that represents a file   How do I write this to a file  ie  C  myfile pdf   I know it s done with InputStream  but I can t seem to work it out

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1  File to Byte                         Path path   Paths get p                       byte   data   null                                               try                           data   Files readAllBytes path                         catch  IOException ex                            Logger getLogger Agent1 class getName    log Level SEVERE  null  ex                                                     2  Byte    to File                               File f   new File fileName    byte   fileContent   msg getByteSequenceContent    Path path   Paths get f getAbsolutePath                                 try                                   Files write path  fileContent                                 catch  IOException ex                                    Logger getLogger Agent2 class getName    log Level SEVERE  null  ex

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Also since Java 7  one line with java nio file Files   Files write new File filePath  toPath    data     Where data is your byte   and filePath is a String   You can also add multiple file open options with the StandardOpenOptions class   Add throws or surround with try catch

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This is a program where we are reading and printing array of bytes offset and length using String Builder and Writing the array of bytes offset length to the new file    Enter code here  import java io File     import java io FileInputStream  import java io FileOutputStream  import java io IOException              This is a program where we are reading and printing array of bytes offset and length using StringBuilder and Writing the array of bytes offset length to the new file          public class ReadandWriteAByte       public void readandWriteBytesToFile            File file   new File  count char       abcdefghijk          File bfile   new File  bytefile txt      New File          byte   b          FileInputStream fis   null                        FileOutputStream fos   null                     try                             fis   new FileInputStream  file                          fos   new FileOutputStream  bfile                            b   new byte  1024                             int i                            StringBuilder sb   new StringBuilder                 while   i   fis read b    -1                                     sb append new String b 5 5                                   fos write b  2  5                                                            System out println sb toString                             catch  IOException e                                    e printStackTrace                             finally                              try                                 if fis    null                                  fis close         This helps to close the stream                        catch  IOException e                              e printStackTrace                                                                                               public static void main  String args                           ReadandWriteAByte rb   new ReadandWriteAByte                          rb readandWriteBytesToFile                                                             O P in console   fghij                    O P in new file  cdefg

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From Java 7 onward you can use the try-with-resources statement to avoid leaking resources and make your code easier to read  More on that here   To write your byteArray to a file you would do   try  FileOutputStream fos   new FileOutputStream  fullPathToFile          fos write byteArray     catch  IOException ioe        ioe printStackTrace

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Use Apache Commons IO  FileUtils writeByteArrayToFile new File  pathname    myByteArray    Or  if you insist on making work for yourself     try  FileOutputStream fos   new FileOutputStream  pathname         fos write myByteArray        fos close    There is no more need for this line since you had created the instance of  fos  inside the try  And this will automatically close the OutputStream

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I know it s done with InputStream   Actually  you d be writing to a file output

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Without any libraries   try  FileOutputStream stream   new FileOutputStream path         stream write bytes       With Google Guava   Files write bytes  new File path      With Apache Commons   FileUtils writeByteArrayToFile new File path   bytes     All of these strategies require that you catch an IOException at some point too

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Another solution using java nio file   byte   bytes        Path path   Paths get  C   myfile pdf    Files write path  bytes

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Basic example   String fileName    file test    BufferedOutputStream bs   null   try        FileOutputStream fs   new FileOutputStream new File fileName        bs   new BufferedOutputStream fs       bs write byte array       bs close        bs   null     catch  Exception e        e printStackTrace      if  bs    null  try   bs close      catch  Exception e

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Try an OutputStream or more specifically FileOutputStream

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You can try Cactoos   new LengthOf new TeeInput array  new File  a txt     value      More details  http   www yegor256 com 2017 06 22 object-oriented-input-output-in-cactoos html

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File f   new File fileName       byte   fileContent   msg getByteSequenceContent         Path path   Paths get f getAbsolutePath     try       Files write path  fileContent     catch  IOException ex        Logger getLogger Agent2 class getName    log Level SEVERE  null  ex

[java] byte[] to file in Java

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