How do I save a String to a text file using Java

Question

In Java  I have text from a text field in a String variable called  text    How can I save the contents of the  text  variable to a file

User · Answer

Take a look at the Java File API  a quick example   try  PrintStream out   new PrintStream new FileOutputStream  filename txt           out print text

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In Java 7 you can do this   String content    Hello File    String path    C  a txt   Files write  Paths get path   content getBytes       There is more info here  http   www drdobbs com jvm java-se-7-new-file-io 231600403

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If you re simply outputting text  rather than any binary data  the following will work   PrintWriter out   new PrintWriter  filename txt      Then  write your String to it  just like you would to any output stream   out println text     You ll need exception handling  as ever  Be sure to call out close   when you ve finished writing   If you are using Java 7 or later  you can use the  try-with-resources statement  which will automatically close your PrintStream when you are done with it  ie exit the block  like so   try  PrintWriter out   new PrintWriter  filename txt          out println text       You will still need to explicitly throw the java io FileNotFoundException as before

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You can use the modify the code below to write your file from whatever class or function is handling the text   One wonders though why the world needs a new text editor     import java io     public class Main        public static void main String   args             try               String str    SomeMoreTextIsHere               File newTextFile   new File  C  thetextfile txt                 FileWriter fw   new FileWriter newTextFile               fw write str               fw close               catch  IOException iox                  do stuff with exception             iox printStackTrace

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If you wish to keep the carriage return characters from the string into a file here is an code example       jLabel1   new JLabel  Enter SQL Statements or SQL Commands         orderButton   new JButton  Execute        textArea   new JTextArea                     String captured from JTextArea       orderButton addActionListener new ActionListener             public void actionPerformed ActionEvent ae                   When Execute button is pressed             String tempQuery   textArea getText                tempQuery   tempQuery replaceAll   n     r n                try  PrintStream out   new PrintStream new FileOutputStream  C  Temp tempQuery sql                       out print tempQuery                 catch  FileNotFoundException e                       TODO Auto-generated catch block                 e printStackTrace                              System out println tempQuery

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Using Java 7   public static void writeToFile String text  String targetFilePath  throws IOException       Path targetPath   Paths get targetFilePath       byte   bytes   text getBytes StandardCharsets UTF 8       Files write targetPath  bytes  StandardOpenOption CREATE

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private static void generateFile String stringToWrite  String outputFile        try                  FileWriter writer   new FileWriter outputFile           writer append stringToWrite           writer flush            writer close            log debug  quot New File is generated    gt  quot  outputFile         catch  Exception exp            log error  quot Exception in generateFile  quot   exp

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Basically the same answer as here  but easy to copy paste  and it just works  -    import java io FileWriter     public void saveToFile String data  String filename        try         FileWriter fw   new FileWriter filename           fw write data         catch  Exception e          throw new RuntimeException e

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If you only care about pushing one block of text to file  this will overwrite it each time   JFileChooser chooser   new JFileChooser    int returnVal   chooser showSaveDialog this   if  returnVal    JFileChooser APPROVE OPTION        FileOutputStream stream   null      PrintStream out   null      try           File file   chooser getSelectedFile            stream   new FileOutputStream file            String text    Your String goes here           out   new PrintStream stream           out print text                      This will overwrite existing contents        catch  Exception ex              do something       finally           try               if stream  null  stream close                if out  null  out close              catch  Exception ex                  do something                     This example allows the user to select a file using a file chooser

User · Answer

I prefer to rely on libraries whenever possible for this sort of operation  This makes me less likely to accidentally omit an important step  like mistake wolfsnipes made above   Some libraries are suggested above  but my favorite for this kind of thing is Google Guava  Guava has a class called Files which works nicely for this task      This is where the file goes  File destination   new File  file txt       This line isn t needed  but is really useful     if you re a beginner and don t know where your file is going to end up  System out println destination getAbsolutePath     try       Files write text  destination  Charset forName  UTF-8       catch  IOException e           Useful error handling here

User · Answer

Use FileUtils writeStringToFile   from Apache Commons IO  No need to reinvent this particular wheel

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import java io     private void stringToFile  String text  String fileName       try        File file   new File  fileName            if file doesnt exists  then create it      if     file exists                    file createNewFile                FileWriter fw   new FileWriter  file getAbsoluteFile           BufferedWriter bw   new BufferedWriter  fw        bw write  text        bw close           System out println  Done writing to     fileName     For testing      catch  IOException e       System out println  Error      e    e printStackTrace            End method stringToFile   You can insert this method into your classes  If you are using this method in a class with a main method  change this class to static by adding the static key word  Either way you will need to import java io   to make it work otherwise File  FileWriter and BufferedWriter will not be recognized

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It s better to close the writer outputstream in a finally block  just in case something happen  finally     if writer    null        try          writer flush            writer close                catch IOException ioe            ioe printStackTrace

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Just did something similar in my project  Use FileWriter will simplify part of your job  And here you can find nice tutorial   BufferedWriter writer   null  try       writer   new BufferedWriter  new FileWriter  yourfilename        writer write  yourstring      catch   IOException e      finally       try               if   writer    null          writer close               catch   IOException e

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Use this  it is very readable   import java nio file Files  import java nio file Paths   Files write Paths get path   lines getBytes    StandardOpenOption WRITE

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My way is based on stream due to running on all Android versions and needs of fecthing resources such as URL URI  any suggestion is welcome   As far as concerned  streams  InputStream and OutputStream  transfer binary data  when developer goes to write a string to a stream  must first convert it to bytes  or in other words encode it   public boolean writeStringToFile File file  String string  Charset charset        if  file    null  return false      if  string    null  return false      return writeBytesToFile file  string getBytes  charset    null    DEFAULT CHARSET charset       public boolean writeBytesToFile File file  byte   data        if  file    null  return false      if  data    null  return false      FileOutputStream fos      BufferedOutputStream bos      try           fos   new FileOutputStream file           bos   new BufferedOutputStream fos           bos write data  0  data length           bos flush            bos close            fos close          catch  IOException e            e printStackTrace            Logger e      IOException            return false            return true

User · Answer

Apache Commons IO contains some great methods for doing this  in particular FileUtils contains the following method   static void writeStringToFile File file  String data     which allows you to write text to a file in one method call   FileUtils writeStringToFile new File  test txt     Hello File      You might also want to consider specifying the encoding for the file as well

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In case if you need create text file based on one single string   import java io IOException  import java nio file Files  import java nio file Paths   public class StringWriteSample       public static void main String   args            String text    This is text to be saved in file            try               Files write Paths get  my-file txt    text getBytes               catch  IOException e                e printStackTrace

User · Answer

Use Apache Commons IO api  Its simple   Use API as   FileUtils writeStringToFile new File  FileNameToWrite txt     stringToWrite      Maven Dependency   lt dependency gt       lt groupId gt commons-io lt  groupId gt       lt artifactId gt commons-io lt  artifactId gt       lt version gt 2 4 lt  version gt   lt  dependency gt

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Using org apache commons io FileUtils   FileUtils writeStringToFile new File  log txt     my string   Charset defaultCharset

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In Java 11 the java nio file Files class was extended by two new utility methods to write a string into a file  The first method  see JavaDoc here  uses the charset UTF-8 as default   Files writeString Path of  my    path     My String      And the second method  see JavaDoc here  allows to specify an individual charset   Files writeString Path of  my    path     My String   StandardCharset ISO 8859 1     Both methods have an optional Varargs parameter for setting file handling options  see JavaDoc here   The following example would create a non-existing file or append the string to an existing one   Files writeString Path of  my    path     String to append   StandardOpenOption CREATE  StandardOpenOption APPEND

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I think the best way is using Files write Path path  Iterable lt   extends CharSequence gt  lines  OpenOption    options    String text    content   Path path   Paths get  path    to    file    Files write path  Arrays asList text      See javadoc      Write lines of text to a file  Each line is a char sequence and is   written to the file in sequence with each line terminated by the   platform s line separator  as defined by the system property   line separator  Characters are encoded into bytes using the specified   charset       The options parameter specifies how the the file is created or opened    If no options are present then this method works as if the CREATE    TRUNCATE EXISTING  and WRITE options are present  In other words  it   opens the file for writing  creating the file if it doesn t exist  or   initially truncating an existing regular-file to a size of 0  The   method ensures that the file is closed when all lines have been   written  or an I O error or other runtime exception is thrown   If an   I O error occurs then it may do so after the file has created or   truncated  or after some bytes have been written to the file    Please note  I see people have already answered with Java s built-in Files write  but what s special in my answer which nobody seems to mention is the overloaded version of the method which takes an Iterable of  CharSequence  i e  String   instead of a byte   array  thus text getBytes   is not required  which is a bit cleaner I think

User · Answer

You can use the ArrayList to put all the contents of the TextArea for exemple  and send as parameter by calling the save  as the writer just wrote string lines  then we use the  for  line by line to write our ArrayList in the end we will be content TextArea in txt file  if something does not make sense  I m sorry is google translator and I who do not speak English   Watch the Windows Notepad  it does not always jump lines  and shows all in one line  use Wordpad ok     private void SaveActionPerformed java awt event ActionEvent evt         String NameFile   Name getText        ArrayList lt  String  gt  Text   new ArrayList lt  String  gt          Text add TextArea getText          SaveFile NameFile  Text         public void SaveFile String name  ArrayList lt  String gt  message         path    C   Users  Paulo Brito  Desktop      name     txt        File file1   new File path        try            if   file1 exists                   file1 createNewFile                        File   files   file1 listFiles              FileWriter fw   new FileWriter file1  true            BufferedWriter bw   new BufferedWriter fw            for  int i   0  i  lt  message size    i                   bw write message get i                bw newLine                       bw close            fw close             FileReader fr   new FileReader file1            BufferedReader br   new BufferedReader fr            fw   new FileWriter file1  true            bw   new BufferedWriter fw            while  br ready                   String line   br readLine                 System out println line                bw write line               bw newLine                       br close            fr close           catch  IOException ex            ex printStackTrace            JOptionPane showMessageDialog null   Error in    ex

User · Answer

You could do this   import java io    import java util     class WriteText       public static void main String   args                   try               String text    Your sample content to save in a text file                BufferedWriter out   new BufferedWriter new FileWriter  sample txt                 out write text               out close                      catch  IOException e                        System out println  Exception                               return

[java] How do I save a String to a text file using Java?

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