Write string to output stream

Question

I have several output listeners that are implementing OutputStream  It can be either a PrintStream writing to stdout or to a File  or it can be writing to memory or any other output destination  therefore  I specified OutputStream as  an  argument in the method   Now  I have received the String  What is the best way to write to streams here   Should I just use Writer write message getBytes     I can give it bytes  but if the destination stream is a character stream then will it convert automatically   Do I need to use some bridge streams here instead

User · Answer

OutputStream writes bytes  String provides chars  You need to define Charset to encode string to byte     outputStream write string getBytes Charset forName  UTF-8        Change UTF-8 to a charset of your choice

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You can create a PrintStream wrapping around your OutputStream and then just call it s print String    final OutputStream os   new FileOutputStream   tmp out    final PrintStream printStream   new PrintStream os   printStream print  String    printStream close

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You may use Apache Commons IO   try  OutputStream outputStream              IOUtils write  data   outputStream   UTF-8         IOUtils write String data  OutputStream output  String encoding

User · Answer

Wrap your OutputStream with a PrintWriter and use the print methods on that class   They take in a String and do the work for you

User · Answer

Streams  InputStream and OutputStream  transfer binary data  If you want to write a string to a stream  you must first convert it to bytes  or in other words encode it  You can do that manually  as you suggest  using the String getBytes Charset  method  but you should avoid the String getBytes   method  because that uses the default encoding of the JVM  which can t be reliably predicted in a portable way   The usual way to write character data to a stream  though  is to wrap the stream in a Writer   often a PrintWriter   that does the conversion for you when you call its write String   or print String   method  The corresponding wrapper for InputStreams is a Reader   PrintStream is a special OutputStream implementation in the sense that it also contain methods that automatically encode strings  it uses a writer internally   But it is still a stream  You can safely wrap your stream with a writer no matter if it is a PrintStream or some other stream implementation  There is no danger of double encoding   Example of PrintWriter with OutputStream   try  PrintWriter p   new PrintWriter new FileOutputStream  output-text txt   true          p println  Hello      catch  FileNotFoundException e1        e1 printStackTrace

User · Answer

By design it is to be done this way   OutputStream out        try  Writer w   new OutputStreamWriter out   UTF-8          w write  Hello  World          or w close      close will auto-flush

[java] Write string to output stream

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