How to Write text file Java

Question

The following code does not produce a file  I can t see the file anywhere   What is missing   try         create a temporary file     String timeLog   new SimpleDateFormat  yyyyMMdd HHmmss   format          Calendar getInstance   getTime         File logFile new File timeLog        BufferedWriter writer   new BufferedWriter new FileWriter logFile        writer write  string          Close writer     writer close      catch Exception e        e printStackTrace

User · Answer

You can try a Java Library  FileUtils  It has many functions that write to Files

User · Answer

It s not creating a file because you never actually created the file  You made an object for it  Creating an instance doesn t create the file   File newFile   new File  directory    fileName txt      You can do this to make a file   newFile createNewFile      You can do this to make a folder   newFile mkdir

User · Answer

I would like to add a bit more to MadProgrammer s Answer   In case of multiple line writing  when executing the command   writer write string     one may notice that the newline characters are omitted or skipped in the written file even though they appear during debugging or if the same text is printed onto the terminal with   System out println   n      Thus  the whole text comes as one big chunk of text which is undesirable in most cases  The newline character can be dependent on the platform  so it is better to get this character from the java system properties using  String newline   System getProperty  line separator      and then using the newline variable instead of   n   This will get the output in the way you want it

User · Answer

The easiest way for me is just like               try                   FileWriter writer   new FileWriter  C  Your Absolute Path YourFile txt                    writer write  Wow  this is so easy                     writer close                  catch  IOException e                    e printStackTrace                    Useful tips  amp  tricks    Give it a certain path   new FileWriter  C  Your Absolute Path YourFile txt    New line  writer write   r n    Append lines into existing txt  new FileWriter  log txt      Hope it works

User · Answer

It does work with me  Make sure that you append   txt  next to timeLog  I used it in a simple program opened with Netbeans and it writes the program in the main folder  where builder and src folders are

User · Answer

In java 7 can now do  try BufferedWriter w             w write         catch IOException        and w close will be done automatically

User · Answer

Using java 8 LocalDateTime and java 7 try-with statement   public class WriteFile        public static void main String   args             String timeLog   DateTimeFormatter ofPattern  yyyyMMdd HHmmss   format LocalDateTime now             File logFile   new File timeLog            try  BufferedWriter bw   new BufferedWriter new FileWriter logFile                           System out println  File was written to       logFile getCanonicalPath                 bw write  Hello world                        catch  IOException e                         e printStackTrace

User · Answer

I think your expectations and reality don t match  but when do they ever      Basically  where you think the file is written and where the file is actually written are not equal  hmmm  perhaps I should write an if statement      public class TestWriteFile        public static void main String   args            BufferedWriter writer   null          try                 create a temporary file             String timeLog   new SimpleDateFormat  yyyyMMdd HHmmss   format Calendar getInstance   getTime                 File logFile   new File timeLog                   This will output the full path where the file will be written to                System out println logFile getCanonicalPath                  writer   new BufferedWriter new FileWriter logFile                writer write  Hello world               catch  Exception e                e printStackTrace              finally               try                      Close the writer regardless of what happens                    writer close                  catch  Exception e                                      Also note that your example will overwrite any existing files   If you want to append the text to the file you should do the following instead   writer   new BufferedWriter new FileWriter logFile  true

[java] How to Write text file Java

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