How to color System out println output

Question

How can I color Java output    For example in C and other languages I can use ANSI-escape like  033 0m to do this  But in Java it doesn t work   public static void main String   x        System out println   033 0m BLABLA  033 0m n

User · Answer

This works in eclipse just to turn it red  don t know about other places   System err println   BLABLA

User · Answer

You can use the JANSI library to render ANSI escape sequences in Windows

User · Answer

The simplest method is to run your program  unmodified  in Cygwin console   The second simplest method is to run you program  also unmodified  in the ordinary Windows console  pipelining its output through tee exe  from Cygwin or Git distribution   Tee exe will recognize the escape codes and call appropriate WinAPI functions   Something like   java MyClass   tee exe log txt java MyClass   tee exe  dev null

User · Answer

Yes it is 100  possible   set classpath   classpath  d  jansi-1 4 jar   Try this below code   import org fusesource jansi AnsiConsole  import static org fusesource jansi Ansi    import static org fusesource jansi Ansi Color     public class Sample       public static void main String   args          AnsiConsole systemInstall         System out println ansi   fg RED  a  Hello World   reset         System out println  My Name is Raman         AnsiConsole systemUninstall

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No  but there are third party API s that can handle it  http   www javaworld com javaworld javaqa 2002-12 02-qa-1220-console html  Edit  of course there are newer articles than that one I posted  the information is still viable though

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Here is a solution for Win32 Console   1  Get JavaNativeAccess libraries here  https   github com twall jna   2  These two Java classes will do the trick   Enjoy   package com stackoverflow util   import com sun jna Library  import com sun jna Native  import com sun jna Platform  import com sun jna Structure   public class Win32       public static final int STD INPUT HANDLE   -10      public static final int STD OUTPUT HANDLE   -11      public static final int STD ERROR HANDLE   -12       public static final short CONSOLE FOREGROUND COLOR BLACK          0x00      public static final short CONSOLE FOREGROUND COLOR BLUE           0x01      public static final short CONSOLE FOREGROUND COLOR GREEN          0x02      public static final short CONSOLE FOREGROUND COLOR AQUA           0x03      public static final short CONSOLE FOREGROUND COLOR RED            0x04      public static final short CONSOLE FOREGROUND COLOR PURPLE         0x05      public static final short CONSOLE FOREGROUND COLOR YELLOW         0x06      public static final short CONSOLE FOREGROUND COLOR WHITE          0x07      public static final short CONSOLE FOREGROUND COLOR GRAY           0x08      public static final short CONSOLE FOREGROUND COLOR LIGHT BLUE     0x09      public static final short CONSOLE FOREGROUND COLOR LIGHT GREEN    0x0A      public static final short CONSOLE FOREGROUND COLOR LIGHT AQUA     0x0B      public static final short CONSOLE FOREGROUND COLOR LIGHT RED      0x0C      public static final short CONSOLE FOREGROUND COLOR LIGHT PURPLE   0x0D      public static final short CONSOLE FOREGROUND COLOR LIGHT YELLOW   0x0E      public static final short CONSOLE FOREGROUND COLOR BRIGHT WHITE   0x0F       public static final short CONSOLE BACKGROUND COLOR BLACK          0x00      public static final short CONSOLE BACKGROUND COLOR BLUE           0x10      public static final short CONSOLE BACKGROUND COLOR GREEN          0x20      public static final short CONSOLE BACKGROUND COLOR AQUA           0x30      public static final short CONSOLE BACKGROUND COLOR RED            0x40      public static final short CONSOLE BACKGROUND COLOR PURPLE         0x50      public static final short CONSOLE BACKGROUND COLOR YELLOW         0x60      public static final short CONSOLE BACKGROUND COLOR WHITE          0x70      public static final short CONSOLE BACKGROUND COLOR GRAY           0x80      public static final short CONSOLE BACKGROUND COLOR LIGHT BLUE     0x90      public static final short CONSOLE BACKGROUND COLOR LIGHT GREEN    0xA0      public static final short CONSOLE BACKGROUND COLOR LIGHT AQUA     0xB0      public static final short CONSOLE BACKGROUND COLOR LIGHT RED      0xC0      public static final short CONSOLE BACKGROUND COLOR LIGHT PURPLE   0xD0      public static final short CONSOLE BACKGROUND COLOR LIGHT YELLOW   0xE0      public static final short CONSOLE BACKGROUND COLOR BRIGHT WHITE   0xF0          typedef struct  COORD             SHORT X            SHORT Y            COORD   PCOORD      public static class COORD extends Structure           public short X          public short Y                typedef struct  SMALL RECT             SHORT Left            SHORT Top            SHORT Right            SHORT Bottom            SMALL RECT      public static class SMALL RECT extends Structure           public short Left          public short Top          public short Right          public short Bottom                typedef struct  CONSOLE SCREEN BUFFER INFO             COORD      dwSize            COORD      dwCursorPosition            WORD       wAttributes            SMALL RECT srWindow            COORD      dwMaximumWindowSize            CONSOLE SCREEN BUFFER INFO      public static class CONSOLE SCREEN BUFFER INFO extends Structure           public COORD dwSize          public COORD dwCursorPosition          public short wAttributes          public SMALL RECT srWindow          public COORD dwMaximumWindowSize                Source  https   github com twall jna nonav javadoc index html     public interface Kernel32 extends Library           Kernel32 DLL    Kernel32  Native loadLibrary  kernel32   Kernel32 class               HANDLE WINAPI GetStdHandle                      in  DWORD nStdHandle                            public int GetStdHandle                  int nStdHandle               BOOL WINAPI SetConsoleTextAttribute                      in  HANDLE hConsoleOutput                      in  WORD wAttributes                            public boolean SetConsoleTextAttribute                  int in hConsoleOutput                   short in wAttributes               BOOL WINAPI GetConsoleScreenBufferInfo                      in   HANDLE hConsoleOutput                      out  PCONSOLE SCREEN BUFFER INFO lpConsoleScreenBufferInfo                            public boolean GetConsoleScreenBufferInfo                  int in hConsoleOutput                  CONSOLE SCREEN BUFFER INFO out lpConsoleScreenBufferInfo               DWORD WINAPI GetLastError void           public int GetLastError                package com stackoverflow util   import java io PrintStream   import com stackoverflow util Win32 Kernel32   public class ConsoleUtil       public static void main String   args      throws Exception           System out print  abc            static color print                  System out                    def                    Win32 CONSOLE BACKGROUND COLOR RED                   Win32 CONSOLE FOREGROUND COLOR BRIGHT WHITE           System out print  def            System out println               private static Win32 CONSOLE SCREEN BUFFER INFO  static console screen buffer info   null        public static void static save settings             if  null     static console screen buffer info                 static console screen buffer info   new Win32 CONSOLE SCREEN BUFFER INFO                      int stdout handle   Kernel32 DLL GetStdHandle Win32 STD OUTPUT HANDLE           Kernel32 DLL GetConsoleScreenBufferInfo stdout handle   static console screen buffer info              public static void static restore color       throws Exception           if  null     static console screen buffer info                throw new Exception  Internal error  Must save settings before restore                      int stdout handle   Kernel32 DLL GetStdHandle Win32 STD OUTPUT HANDLE           Kernel32 DLL SetConsoleTextAttribute                  stdout handle                    static console screen buffer info wAttributes              public static void static set color Short background color  Short foreground color            int stdout handle   Kernel32 DLL GetStdHandle Win32 STD OUTPUT HANDLE           if  null    background color    null    foreground color                Win32 CONSOLE SCREEN BUFFER INFO console screen buffer info                    new Win32 CONSOLE SCREEN BUFFER INFO                Kernel32 DLL GetConsoleScreenBufferInfo stdout handle  console screen buffer info               short current bg and fg color   console screen buffer info wAttributes              if  null    background color                    short current bg color    short   current bg and fg color   0x10                   background color   new Short current bg color                             if  null    foreground color                    short current fg color    short   current bg and fg color   0x10                   foreground color   new Short current fg color                                   short bg and fg color                 short   background color shortValue     foreground color shortValue             Kernel32 DLL SetConsoleTextAttribute stdout handle  bg and fg color              public static lt T gt  void static color print              PrintStream ostream               T value               Short background color               Short foreground color      throws Exception           static save settings            try               static set color background color  foreground color               ostream print value                     finally               static restore color                         public static lt T gt  void static color println              PrintStream ostream               T value               Short background color               Short foreground color      throws Exception           static save settings            try               static set color background color  foreground color               ostream println value                     finally               static restore color

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I ve written a library called AnsiScape that allows you to write coloured output in a more structured way   Example   AnsiScape ansiScape   new AnsiScape    String colors   ansiScape format   red  blueBg Red text with blue background    b Bold text     System out println colors     The library it also allows you to define your own  escape classes  akin to css classes   Example   AnsiScapeContext context   new AnsiScapeContext        Defines a  class  for text AnsiClass text   AnsiClass withName  text   add RED      Defines a  class  for the title used AnsiClass title   AnsiClass withName  title   add BOLD  BLUE BG  YELLOW      Defines a  class  to render urls AnsiClass url   AnsiClass withName  url   add BLUE  UNDERLINE       Registering the classes to the context context add text  add title  add url       Creating an AnsiScape instance with the custom context AnsiScape ansiScape   new AnsiScape context    String fmt     title Chapter 1  n                    text So it begins   n                   -  text Option 1  n                   -  text Url   url www someurl xyz      System out println ansiScape format fmt

User · Answer

Check This Out  i used ANSI values with escape code and it probably not work in windows command prompt but in IDEs and Unix shell  you can also check  Jansi  library here  for windows support   System out println   u001B 35m     This text is PURPLE       u001B 0m

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System err println  Errorrrrrr   it will print text in Red color on console

User · Answer

This has worked for me   System out println  char 27     31mThis text would show up red     char 27     0m      You need the ending   37m  to return the color to white  or whatever you were using    If you don t it may make everything that follows  red

User · Answer

Escape sequences must be interpreted by SOMETHING to be converted to color   The standard CMD EXE used by java when started from the command line  doesn t support this so therefore Java does not

User · Answer

I created a jar library called JCDP  Java Colored Debug Printer    For Linux it uses the ANSI escape codes that WhiteFang mentioned  but abstracts them using words instead of codes which is much more intuitive   For Windows it actually includes the JAnsi library but creates an abstraction layer over it  maintaining the intuitive and simple interface created for Linux   This library is licensed under the MIT License so feel free to use it   Have a look at JCDP s github repository

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Note  You may not be able to color Window s cmd prompt  but it should work in many unix  or unix-like  terminals   Also  note that some terminals simply won t support some  if any  ANSI escape sequences and  especially  24-bit colors   Usage  Please refer to the section Curses at the bottom for the best solution  For a personal or easy solution  although not as cross-platform solution   refer to the ANSI Escape Sequences section     TL DR   java  System out println  char 27     31m     ERROR MESSAGE IN RED    python  print chr 27      31m     ERROR MESSAGE IN RED   bash or zsh  printf   x1b 31mERROR MESSAGE IN RED    this may also work for Os X  printf   e 31mERROR MESSAGE IN RED   sh  printf  CTRL V CTRL   31mERROR MESSAGE IN RED    ie  press CTRL V and then CTRL   in order to get a  raw  ESC character when escape interpretation is not available If done correctly  you should see a     Although it looks like two characters  it is really just one  the ESC character  You can also press CTRL V CTRL   in vim in any of the programming or sripting langauges because that uses a literal ESC character Also  you can replace Ctrl   with ESC     eg  you can use CTRL V ESC  but I find the former easier  since I am already pressing CTRL and since   is less out of the way       ANSI Escape Sequences  Background on Escape Sequences  While it is not the best way to do it  the easiest way to do this in a programming or scripting language is to use escape sequences  From that link      An escape sequence is a series of characters used to change the state of computers and their attached peripheral devices  These are also known as control sequences  reflecting their use in device control    Backgound on ANSI Escape Sequences  However  it gets even easier than that in video text terminals  as these terminals use ANSI escape sequences  From that link      ANSI escape sequences are a standard for in-band signaling to control the cursor location  color  and other options on video text terminals  Certain sequences of bytes  most starting with Esc and      are embedded into the text  which the terminal looks for and interprets as commands  not as character codes    How to Use ANSI Escape Sequences  Generally   Escape sequences begin with an escape character  for ANSI escape sequences  the sequence always begins with ESC  ASCII  27   hex  0x1B   For a list of what you can do  refer to the ANSI Escape Sequence List on Wikipedia   In Programming Languages  Some programming langauges  like Java  will not interpret  e or  x1b as the ESC character  However  we know that the ASCII character 27 is the ESC character  so we can simply typecast 27 to a char and use that to begin the escape sequence   Here are some ways to do it in common programming languages    Java   System out println  char 27     33mYELLOW     Python 3   print chr 27      34mBLUE    print   x1b 35mMAGENTA      Note that  x1b is interpretted correctly in python   Node JS   The following will NOT color output in JavaScript in the Web Console console log String fromCharCode 27      36mCYAN    console log   x1b 30 47mBLACK ON WHITE      Note that  x1b also works in node     In Shell Prompt OR Scripts  If you are working with bash or zsh  it is quite easy to color the output  in most terminals   In Linux  Os X  and in some Window s terminals  you can check to see if your terminal supports color by doing both of the following    printf   e 31mRED  printf   x1b 31mRED    If you see color for both  then that s great  If you see color for only one  then use that sequence  If you do not see color for either of them  then double check to make sure you typed everything correctly and that you are in bash or zsh  if you still do not see any color  then your terminal probably does not support ANSI escape sequences   If I recall correctly  linux terminals tend to support both  e and  x1b escape sequences  while os x terminals only tend to support  e  but I may be wrong  Nonetheless  if you see something like the following image  then you re all set   Note that I am using the shell  zsh  and it is coloring my prompt string  also  I am using urxvt as my terminal in linux       How does this work   you might ask  Bascially  printf is interpretting the sequence of characters that follows  everything inside of the single-quotes   When printf encounters  e or  x1b  it will convert these characters to the ESC character  ASCII  27   That s just what we want  Now  printf sends ESC31m  and since there is an ESC followed by a valid ANSI escape sequence  we should get colored output  so long as it is supported by the terminal    You can also use echo -e   e 32mGREEN   for example   to color output  Note that the -e flag for echo   enables  interpretation of backslash escapes  and must be used if you want echo to appropriately interpret the escape sequence     More on ANSI Escape Sequences  ANSI escape sequences can do more than just color output  but let s start with that  and see exactly how color works  then  we will see how to manipulate the cursor  finally  we ll take a look and see how to use 8-bit color and also 24-bit color  although it only has tenuous support    On Wikipedia  they refer to ESC  as CSI  so I will do the same   Color  To color output using ANSI escapes  use the following    CSI n m   CSI  escape character       or ESC  n  a number   one of the following    30-37  39  foreground 40-47  49  background  m  a literal ASCII m   terminates the escape sequence    I will use bash or zsh to demonstrate all of the possible color combinations  Plop the following in bash or zsh to see for yourself   You may need to replace  e with  x1b     for fg in  30  37  39  do for bg in  40  47  49  do printf   e   fg    bg m TEST    done  printf   n   done    Result     Quick Reference  Color                                  fg     bg     color                                     30     40     black         31     41     red           32     42     green         33     43     yellow        34     44     blue          35     45     magenta       36     46     cyan          37     47     white         39     49     default                                  Select Graphic Rendition  SGR   SGR just allows you to change the text  Many of these do not work in certain terminals  so use these sparingly in production-level projects  However  they can be useful for making program output more readable or helping you distinguish between different types of output   Color actually falls under SGR  so the syntax is the same    CSI n m   CSI  escape character       or ESC  n  a number   one of the following    0  reset 1-9  turns on various text effects 21-29  turns off various text effects  less supported than 1-9  30-37  39  foreground color 40-47  49  background color 38  8- or 24-bit foreground color  see 8 24-bit Color below  48  8- or 24-bit background color  see 8 24-bit Color below   m  a literal ASCII m   terminates the escape sequence    Although there is only tenuous support for faint  2   italic  3   underline  4   blinking  5 6   reverse video  7   conceal  8   and crossed out  9   some  but rarely all  tend to work on linux and os x terminals   It s also worthwhile to note that you can separate any of the above attributes with a semi-colon  For example printf   e 34 47 1 3mCRAZY TEXT n  will show CRAZY TEXT with a blue foreground on a white background  and it will be bold and italic   Eg     Plop the following in your bash or zsh shell to see all of the text effects you can do   You may need to replace  e with  x1b     for i in  1  9   do printf   e   i m TEST  e 0m    done   Result      You can see that my terminal supports all of the text effects except for faint  2   conceal  8  and cross out  9    Quick Reference  SGR Attributes 0-9                                 n     effect                                          0     reset                1     bold                 2     faint                3     italic               4     underline            5     slow blink           6     rapid blink          7     inverse              8     conceal              9     strikethrough                                   not widely supported    not widely supported and sometimes treated as inverse   8-bit Color  While most terminals support this  it is less supported than 0-7 9 colors   Syntax    CSI 38 5  n m   CSI  escape character       or ESC  38 5   literal string that denotes use of 8-bit colors for foreground n  a number   one of the following    0-255     If you want to preview all of the colors in your terminal in a nice way  I have a nice script on gist github com   It looks like this     If you want to change the background using 8-bit colors  just replace the 38 with a 48    CSI 48 5  n m   CSI  escape character       or ESC  48 5   literal string that denotes use of 8-bit colors for background n  a number   one of the following    0-255     24-bit Color  Also known as true color  24-bit color provides some really cool functionality  Support for this is definitely growing  as far as I know it works in most modern terminals except urxvt  my terminal  insert angry emoji     24-bit color is actually supported in vim  see the vim wiki to see how to enable 24-bit colors   It s really neat because it pulls from the colorscheme defined for gvim  eg  it uses the fg bg from highlight guibg         guifg         for the 24-bit colors  Neato  huh   Here is how 24-bit color works    CSI 38 2  r   g   b m   CSI  escape character       or ESC  38 2   literal string that denotes use of 24-bit colors for foreground r g b  numbers   each should be 0-255    To test just a few of the many colors you can have   2 8  3 or 2 24 or 16777216 possibilites  I think   you can use this in bash or zsh    for r in 0 127 255  do for g in 0 127 255  do for b in 0 127 255  do printf   e 38 2   r    g    b m  r  g  b  e 0m    done  printf   n   done  done    Result  this is in gnome-terminal since urxvt DOES NOT SUPPORT 24-bit color     get it together  urxvt maintainer     for real      If you want 24-bit colors for the background     you guessed it  You just replace 38 with 48    CSI 48 2  r   g   b m   CSI  escape character       or ESC  48 2   literal string that denotes use of 24-bit colors for background r g b  numbers   each should be 0-255    Inserting Raw Escape Sequences  Sometimes  e and  x1b will not work  For example  in the sh shell  sometimes neither works  although it does on my system now  I don t think it used to    To circumvent this  you can use CTRL V CTRL   or CTRLV ESC  This will insert a  raw  ESC character  ASCII  27   It will look like this     but do not fret  it is only one character   not two   Eg       Curses  Refer to the Curses  Programming Library  page for a full reference on curses  It should be noted that curses only works on unix and unix-like operating systems   Up and Running with Curses  I won t go into too much detail  for search engines can reveal links to websites that can explain this much better than I can  but I ll discuss it briefly here and give an example   Why Use Curses Over ANSI Escapes   If you read the above text  you might recall that  e or  x1b will sometimes work with printf  Well  sometimes  e and  x1b will not work at all  this is not standard and I have never worked with a terminal like this  but it is possible   More importantly  more complex escape sequences  think Home and other multi-character keys  are difficult to support for every terminal  unless you are willing to spend a lot of time and effort parsing terminfo and termcap and and figuring out how to handle every terminal    Curses solves this problem  Basically  it is able to understand what capabilities a terminal has  using these methods  as described by the wikipedia article linked above       Most implementations of curses use a database that can describe the capabilities of thousands of different terminals  There are a few implementations  such as PDCurses  which use specialized device drivers rather than a terminal database  Most implementations use terminfo  some use termcap  Curses has the advantage of back-portability to character-cell terminals and simplicity  For an application that does not require bit-mapped graphics or multiple fonts  an interface implementation using curses will usually be much simpler and faster than one using an X toolkit    Most of the time  curses will poll terminfo and will then be able to understand how to manipulate the cursor and text attributes  Then  you  the programmer  use the API provided by curses to manipulate the cursor or change the text color or other attributes if the functionality you seek is desired   Example with Python  I find python is really easy to use  but if you want to use curses in a different programming language  then simply search it on duckduckgo or any other search engine     Here is a quick example in python 3   import curses  def main stdscr         allow curses to use default foreground background  39 49      curses use default colors          Clear screen     stdscr clear        curses init pair 1  curses COLOR RED  -1      curses init pair 2  curses COLOR GREEN  -1      stdscr addstr  ERROR  I like tacos  but I don t have any  n   curses color pair 1       stdscr addstr  SUCCESS  I found some tacos  n   curses color pair 2        stdscr refresh     make sure screen is refreshed     stdscr getkey      wait for user to press key  if   name         main         curses wrapper main    result     You might think to yourself that this is a much more round-about way of doing things  but it really is much more cross-platform  really cross-terminal     at least in the unix- and unix-like-platform world   For colors  it is not quite as important  but when it comes to supporting other multi-sequence escape sequences  such as Home  End  Page Up  Page Down  etc   then curses becomes all the more important   Example with Tput   tput is a command line utility for manipulating cursor and text tput comes with the curses package  If you want to use cross-terminal  ish  applications in the terminal  you should use tput  as it parses terminfo or whatever it needs to and uses a set of standardized commands  like curses  and returns the correct escape sequence  example    echo    tput setaf 1   tput bold ERROR   tput sgr0   tput setaf 1  My tacos have gone missing  echo    tput setaf 2   tput bold SUCCESS   tput sgr0   tput setaf 2  Oh good   I found my tacos      Result     More Info on Tput   see  http   linuxcommand org lc3 adv tput php to see how tput works see  http   invisible-island net ncurses man terminfo 5 html for a list of commands that you can use

[java] How to color System.out.println output?

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