Write a file in UTF-8 using FileWriter Java

Question

I have the following code however  I want it to write as a UTF-8 file to handle foreign characters   Is there a way of doing this  is there some need to have a parameter                   I would really appreciate your help with this   Thanks   try     BufferedReader reader   new BufferedReader new FileReader  C  Users Jess My Documents actresses list       writer   new BufferedWriter new FileWriter  C  Users Jess My Documents actressesFormatted csv       while   line   reader readLine       null          If the line starts with a tab then we just want to add a movie       using the current actor s name      if line length      0        continue      else if line charAt 0       t           readMovieLine2 0  line  surname toString    forename toString             Else we ve reached a new actor     else         readActorName line               catch  IOException e      e printStackTrace

User · Answer

Ditch FileWriter and FileReader  which are useless exactly because they do not allow you to specify the encoding  Instead  use   new OutputStreamWriter new FileOutputStream file   StandardCharsets UTF 8    and   new InputStreamReader new FileInputStream file   StandardCharsets UTF 8

User · Answer

With Chinese text  I tried to use the Charset UTF-16 and lucklily it work   Hope this could help   PrintWriter out   new PrintWriter  file   UTF-16

User · Answer

Since Java 7 there is an easy way to handle character encoding of BufferedWriter and BufferedReaders  You can create a BufferedWriter directly by using the Files class instead of creating various instances of Writer  You can simply create a BufferedWriter  which considers character encoding  by calling   Files newBufferedWriter file toPath    StandardCharsets UTF 8     You can find more about it in JavaDoc    Files class Files newBufferedWriter

User · Answer

You need to use the OutputStreamWriter class as the writer parameter for your BufferedWriter  It does accept an encoding  Review javadocs for it   Somewhat like this   BufferedWriter out   new BufferedWriter new OutputStreamWriter      new FileOutputStream  jedis txt     UTF-8        Or you can set the current system encoding with the system property file encoding to UTF-8   java -Dfile encoding UTF-8 com jediacademy Runner arg1 arg2       You may also set it as a system property at runtime with System setProperty      if you only need it for this specific file  but in a case like this I think I would prefer the OutputStreamWriter   By setting the system property you can use FileWriter and expect that it will use UTF-8 as the default encoding for your files  In this case for all the files that you read and write   EDIT   Starting from API 19  you can replace the String  UTF-8  with StandardCharsets UTF 8 As suggested in the comments below by tchrist  if you intend to detect encoding errors in your file you would be forced to use the OutputStreamWriter approach and use the constructor that receives a charset encoder   Somewhat like  CharsetEncoder encoder   Charset forName  UTF-8   newEncoder    encoder onMalformedInput CodingErrorAction REPORT   encoder onUnmappableCharacter CodingErrorAction REPORT   BufferedWriter out   new BufferedWriter new OutputStreamWriter new FileOutputStream  jedis txt   encoder      You may choose between actions IGNORE   REPLACE   REPORT   Also  this question was already answered here

User · Answer

Since Java 11 you can do   FileWriter fw   new FileWriter  filename txt   Charset forName  utf-8

User · Answer

use OutputStream instead of FileWriter to set encoding type      file is your File object where you want to write you data  OutputStream outputStream   new FileOutputStream file   OutputStreamWriter outputStreamWriter   new OutputStreamWriter outputStream   UTF-8    outputStreamWriter write json      json is your data  outputStreamWriter flush    outputStreamWriter close

User · Answer

Safe Encoding Constructors  Getting Java to properly notify you of encoding errors is tricky  You must use the most verbose and  alas  the least used of the four alternate contructors for each of InputStreamReader and OutputStreamWriter to receive a proper exception on an encoding glitch   For file I O  always make sure to always use as the second argument to both OutputStreamWriter and InputStreamReader the fancy encoder argument     Charset forName  UTF-8   newEncoder     There are other even fancier possibilities  but none of the three simpler possibilities work for exception handing  These do    OutputStreamWriter char output   new OutputStreamWriter       new FileOutputStream  some output utf8         Charset forName  UTF-8   newEncoder          InputStreamReader char input   new InputStreamReader       new FileInputStream  some input utf8         Charset forName  UTF-8   newDecoder          As for running with     java -Dfile encoding utf8 SomeTrulyRemarkablyLongcLassNameGoeShere   The problem is that that will not use the full encoder argument form for the character streams  and so you will again miss encoding problems   Longer Example  Here   s a longer example  this one managing a process instead of a file  where we  promote two different input bytes streams and one output byte stream all to UTF-8 character streams with full exception handling       this runs a perl script with UTF-8 STD IN OUT ERR  streams  Process  slave process   Runtime getRuntime   exec  perl -CS script args         fetch his stdin byte stream     OutputStream    bytes into his stdin    slave process getOutputStream         and make a character stream with exceptions on encoding errors  OutputStreamWriter    chars into his stdin    new OutputStreamWriter                                 bytes into his stdin              DO NOT OMIT      Charset forName  UTF-8   newEncoder                                    fetch his stdout byte stream     InputStream    bytes from his stdout   slave process getInputStream         and make a character stream with exceptions on encoding errors  InputStreamReader    chars from his stdout   new InputStreamReader                                 bytes from his stdout              DO NOT OMIT      Charset forName  UTF-8   newDecoder                                   fetch his stderr byte stream     InputStream    bytes from his stderr   slave process getErrorStream         and make a character stream with exceptions on encoding errors  InputStreamReader    chars from his stderr   new InputStreamReader                                 bytes from his stderr              DO NOT OMIT      Charset forName  UTF-8   newDecoder                                 Now you have three character streams that all raise exception on encoding errors  respectively called chars into his stdin  chars from his stdout  and chars from his stderr    This is only slightly more complicated that what you need for your problem  whose solution I gave in the first half of this answer   The key point is this is the only way to detect encoding errors    Just don   t get me started about PrintStreams eating exceptions

User · Answer

OK it s 2019 now  and from Java 11 you have a constructor with Charset   FileWriter  String fileName  Charset charset       Unfortunately  we still cannot modify the byte buffer size  and it s   set to 8192   https   www baeldung com java-filewriter

User · Answer

In my opinion  If you wanna write follow kind UTF-8 You should create a byte array Then you can do such as the following  byte   by    lt  xml version   1 0   encoding   utf-8    gt    Your string  getBytes     Then  you can write each byte into file you created  Example   OutputStream f new FileOutputStream xmlfile       byte   by    lt  xml version   1 0   encoding   utf-8    gt    Your string  getBytes        for  int i 0 i lt by length i         byte b by i       f write b              f close

[java] Write a file in UTF-8 using FileWriter (Java)?

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