Get an OutputStream into a String

Question

What s the best way to pipe the output from an java io OutputStream to a String in Java   Say I have the method     writeToStream Object o  OutputStream out    Which writes certain data from the object to the given stream  However  I want to get this output into a String as easily as possible   I m considering writing a class like this  untested    class StringOutputStream extends OutputStream      StringBuilder mBuf     public void write int byte  throws IOException       mBuf append  char  byte          public String getString         return mBuf toString            But is there a better way  I only want to run a test

User · Accepted Answer

I would use a ByteArrayOutputStream  And on finish you can call   new String  baos toByteArray    codepage      or better   baos toString  codepage      For the String constructor  the codepage can be a String or an instance of java nio charset Charset  A possible value is java nio charset StandardCharsets UTF 8   The method toString   accepts only a String as a codepage parameter  stand Java 8

User · Answer

This worked nicely  OutputStream output   new OutputStream         private StringBuilder string   new StringBuilder          Override     public void write int b  throws IOException           this string append  char  b                 Netbeans IDE automatically overrides this toString       public String toString             return this string toString               method call     marshaller marshal   Object  toWrite    OutputStream  output    then to print the string or get it just reference the  output  stream itself As an example  to print the string out to console     System out println output    FYI  my method call marshaller marshal Object Outputstream  is for working with XML  It is irrelevant to this topic   This is highly wasteful for productional use  there is a way too many conversion and it is a bit loose  This was just coded to prove to you that it is totally possible to create a custom OuputStream and output a string  But just go Horcrux7 way and all is good with merely two method calls    And the world lives on another day

User · Answer

Here s what I ended up doing   Obj writeToStream toWrite  os   try       String out   new String os toByteArray     UTF-8        assertTrue out contains  testString       catch  UnsupportedEncondingException e        fail  Caught exception      e getMessage         Where os is a ByteArrayOutputStream

User · Answer

Here s what I ended up doing   Obj writeToStream toWrite  os   try       String out   new String os toByteArray     UTF-8        assertTrue out contains  testString       catch  UnsupportedEncondingException e        fail  Caught exception      e getMessage         Where os is a ByteArrayOutputStream

User · Answer

Here s what I ended up doing   Obj writeToStream toWrite  os   try       String out   new String os toByteArray     UTF-8        assertTrue out contains  testString       catch  UnsupportedEncondingException e        fail  Caught exception      e getMessage         Where os is a ByteArrayOutputStream

User · Answer

baos toString StandardCharsets UTF 8        Converts the buffer s contents into a string by decoding the bytes using the named charset     Java 14 - https   docs oracle com

User · Answer

baos toString StandardCharsets UTF 8        Converts the buffer s contents into a string by decoding the bytes using the named charset     Java 14 - https   docs oracle com

User · Answer

Here s what I ended up doing   Obj writeToStream toWrite  os   try       String out   new String os toByteArray     UTF-8        assertTrue out contains  testString       catch  UnsupportedEncondingException e        fail  Caught exception      e getMessage         Where os is a ByteArrayOutputStream

User · Answer

This worked nicely  OutputStream output   new OutputStream         private StringBuilder string   new StringBuilder          Override     public void write int b  throws IOException           this string append  char  b                 Netbeans IDE automatically overrides this toString       public String toString             return this string toString               method call     marshaller marshal   Object  toWrite    OutputStream  output    then to print the string or get it just reference the  output  stream itself As an example  to print the string out to console     System out println output    FYI  my method call marshaller marshal Object Outputstream  is for working with XML  It is irrelevant to this topic   This is highly wasteful for productional use  there is a way too many conversion and it is a bit loose  This was just coded to prove to you that it is totally possible to create a custom OuputStream and output a string  But just go Horcrux7 way and all is good with merely two method calls    And the world lives on another day

User · Answer

I like the Apache Commons IO library  Take a look at its version of ByteArrayOutputStream  which has a toString String enc  method as well as toByteArray    Using existing and trusted components like the Commons project lets your code be smaller and easier to extend and repurpose

User · Answer

I like the Apache Commons IO library  Take a look at its version of ByteArrayOutputStream  which has a toString String enc  method as well as toByteArray    Using existing and trusted components like the Commons project lets your code be smaller and easier to extend and repurpose

User · Answer

I like the Apache Commons IO library  Take a look at its version of ByteArrayOutputStream  which has a toString String enc  method as well as toByteArray    Using existing and trusted components like the Commons project lets your code be smaller and easier to extend and repurpose

User · Answer

I like the Apache Commons IO library  Take a look at its version of ByteArrayOutputStream  which has a toString String enc  method as well as toByteArray    Using existing and trusted components like the Commons project lets your code be smaller and easier to extend and repurpose

[java] Get an OutputStream into a String

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