Easy to Learn Java: Programming Articles, Examples and Tips

Start with Java in a few days with Java Lessons or Lectures


Code Examples

Java Tools

More Java Tools!

Java Forum

All Java Tips


Submit News
Search the site here...
Search the JavaFAQ.nu
1000 Java Tips ebook

1000 Java Tips - Click here for the high resolution copy!1000 Java Tips - Click here for the high resolution copy!

Java Screensaver, take it here

Free "1000 Java Tips" eBook is here! It is huge collection of big and small Java programming articles and tips. Please take your copy here.

Take your copy of free "Java Technology Screensaver"!.

Find out in one minute why you can not wirite unicode characters to my file!

JavaFAQ Home » Text processing Go to all tips in Text processing

Bookmark and Share

Question: I am trying to redirect output of System.out.println command to a file.

Generally it works well, excluding cases when I use unicode characters. When I do printout on a console I see them but in a file I see single '?' characters Sad

Answer: Probably you use PrintStream.

It uses the platform's default character encoding and converts characters to bytes. This works if you do:


System.out.println("Trying to test println");

But if you do:

System.out.println("Trying to test println\u4321");

you will get that '?' instead of unicode

'\u4321' character. The solution is to use PrintWriter on top of StringWriter. PrintWriter operates with characters, not bytes. StringWriter accumulates those characters:


StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);

// write our output (to the StringWriter)
pw.println("Trying to test println\u4321");

// retrieve a string containing our output
String outpStr = sw.toString();

// display it

// output the string to a file, using
// the UTF-8 encoding

FileOutputStream fos =
   new FileOutputStream("out.txt");
OutputStreamWriter outpStrWr =
   new OutputStreamWriter(fos, "UTF-8");
BufferedWriter buffWriter =
   new BufferedWriter(outpStrWr);

In our example characters are written into the file using UTF-8 encoding and will not be "narrowed" to ASCII characters!




 Printer Friendly Page  Printer Friendly Page
 Send to a Friend  Send to a Friend

.. Bookmark and Share

Search here again if you need more info!
Custom Search

Home Code Examples Java Forum All Java Tips Books Submit News, Code... Search... Offshore Software Tech Doodling

RSS feed Java FAQ RSS feed Java FAQ News     

    RSS feed Java Forums RSS feed Java Forums

All logos and trademarks in this site are property of their respective owner. The comments are property of their posters, all the rest 1999-2006 by Java FAQs Daily Tips.

Interactive software released under GNU GPL, Code Credits, Privacy Policy