How to write console output to a txt file

Question

I have tried to write the console output to a txt file using this code suggestion  http   www daniweb com forums thread23883 html   however I was not successful  What s wrong   try           create a buffered reader that connects to the console  we use it so we can read lines       BufferedReader in   new BufferedReader new InputStreamReader System in             read a line from the console       String lineFromInput   in readLine             create an print writer for writing to a file       PrintWriter out   new PrintWriter new FileWriter  output txt              output to the file a line       out println lineFromInput            close the file  VERY IMPORTANT         out close               catch IOException e1            System out println  Error during reading writing

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There is no need to write any code  just in cmd on the console you can write   javac myFile java java ClassName  gt  a txt   The output data is stored in the a txt file

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You need to do something like this   PrintStream out   new PrintStream new FileOutputStream  output txt     System setOut out     The second statement is the key   It changes the value of the supposedly  final  System out attribute to be the supplied PrintStream value   There are analogous methods  setIn and setErr  for changing the standard input and error streams  refer to the java lang System javadocs for details   A more general version of the above is this   PrintStream out   new PrintStream          new FileOutputStream  output txt   append   autoFlush   System setOut out     If append is true  the stream will append to an existing file instead of truncating it   If autoflush is true  the output buffer will be flushed whenever a byte array is written  one of the println methods is called  or a  n is written     I d just like to add that it is usually a better idea to use a logging subsystem like Log4j  Logback or the standard Java java util logging subsystem   These offer fine-grained logging control via runtime configuration files  support for rolling log files  feeds to system logging  and so on   Alternatively  if you are not  logging  then consider the following    With typical shells  you can redirecting standard output  or standard error  to a file on the command line  e g     java MyApp  gt  output txt      For more information  refer to a shell tutorial or manual entry  You could change your application to use an out stream passed as a method parameter or via a singleton or dependency injection rather than writing to System out    Changing System out may cause nasty surprises for other code in your JVM that is not expecting this to happen    A properly designed Java library will avoid depending on System out and System err  but you could be unlucky

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PrintWriter out   null  try       out   new PrintWriter new FileWriter  C   testing txt           catch  IOException e                e printStackTrace          out println  output    out close      I am using absolute path for the FileWriter  It is working for me like a charm  Also Make sure the file is present in the location  Else It will throw a FileNotFoundException  This method does not create a new file in the target location if the file is not found

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You can use System setOut   at the start of your program to redirect all output via System out to your own PrintStream

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to preserve the console output  that is  write to a file and also have it displayed on the console  you could use a class like         public class TeePrintStream extends PrintStream           private final PrintStream second           public TeePrintStream OutputStream main  PrintStream second                super main               this second   second                                    Closes the main stream              The second stream is just flushed but  lt b gt not lt  b gt  closed              see java io PrintStream close                        Override         public void close                    just for documentation             super close                        Override         public void flush                 super flush                second flush                        Override         public void write byte   buf  int off  int len                super write buf  off  len               second write buf  off  len                       Override         public void write int b                super write b               second write b                       Override         public void write byte   b  throws IOException               super write b               second write b                     and used as in         FileOutputStream file   new FileOutputStream  test txt        TeePrintStream tee   new TeePrintStream file  System out       System setOut tee      just an idea  not complete

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In addition to the several programatic approaches discussed  another option is to redirect standard output from the shell  Here are several Unix and DOS examples

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To write console output to a txt file  public static void main String   args        int i      List lt String gt  ls   new ArrayList lt String gt         for  i   1  i  lt   100  i              String str   null          str    i     -  HOW TO WRITE A CONSOLE OUTPUT IN A TEXT FILE           ls add str             String listString           for  String s   ls            listString    s     n             FileWriter writer   null      try           writer   new FileWriter  final txt            writer write listString           writer close          catch  IOException e            e printStackTrace              If you want to generate the PDF rather then the text file  you use the dependency given below    lt dependency gt           lt groupId gt com itextpdf lt  groupId gt           lt artifactId gt itextpdf lt  artifactId gt           lt version gt 5 0 6 lt  version gt   lt  dependency gt    To generate a PDF  use this code   public static void main String   args        int i      List lt String gt  ls   new ArrayList lt String gt         for  i   1  i  lt   100  i              String str   null          str    i     - HOW TO WRITE A CONSOLE OUTPUT IN A PDF           ls add str             String listString            for  String s   ls            listString    s     n             Document document   new Document        try           PdfWriter writer1   PdfWriter                  getInstance                          document                          new FileOutputStream                                   final pdf pdf             document open            document add new Paragraph listString            document close            writer1 close          catch  FileNotFoundException e            e printStackTrace          catch  DocumentException e            e printStackTrace

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Create the following method   public class Logger       public static void log String message           PrintWriter out   new PrintWriter new FileWriter  output txt   true   true         out write message         out close               I haven t included the proper IO handling in the above class  and it won t compile - do it yourself  Also consider configuring the file name  Note the  true  argument  This means the file will not be re-created each time you call the method   Then instead of System out println str  call Logger log str   This manual approach is not preferable  Use a logging framework - slf4j  log4j  commons-logging  and many more

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This is my idea of what you are trying to do and it works fine   public static void main String   args  throws IOException       BufferedReader in   new BufferedReader new InputStreamReader System in         BufferedWriter out   new BufferedWriter new FileWriter  c   output txt         try           String inputLine   null          do               inputLine in readLine                out write inputLine               out newLine              while   inputLine equalsIgnoreCase  eof             System out print  Write Successful          catch IOException e1            System out println  Error during reading writing          finally           out close            in close

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In netbeans  you can right click the mouse and then save as a  txt file  Then  based on the created  txt file  you can convert to the file in any format you want to get

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The easiest way to write console output to text file is        create a file first         PrintWriter outputfile   new PrintWriter filename     replace your System out print  your output        outputfile print  your output        outputfile close

[java] How to write console output to a txt file

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