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Java IO OutputStreamWriter

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In this section we will learn about the Java OutputStreamWriter.

Java IO OutputStreamWriter

In this section we will learn about the Java OutputStreamWriter.

java.io.OutputStreamWriter is a character written output stream which encodes the characters into bytes, for encoding this class uses a specific charset. OutputStreamWriter is acted as a bridge into encoding of character streams to byte streams. write() method in OutputStreamWriter facilitate to write characters to the stream. Wrapping within BufferedWriter of this class makes it more efficient.

Constructor Detail

Constructor
Description
OutputStreamWriter(OutputStream out) This constructor is used to create a new OutputStreamWriter contains the characters stream. This constructor uses the default encoding system from characters to bytes.
Syntax : public OutputStreamWriter(OutputStream out)
OutputStreamWriter(OutputStream out, Charset cs) This constructor is used to create new OutputStreamWriter contains the character stream. This constructor uses the specified charset.
Syntax : public OutputStreamWriter(OutputStream out, Charset cs)
OutputStreamWriter(OutputStream out, CharsetEncoder enc) This constructor is used to create a new OutpuStreamWriter contains the characters stream. This constructor uses a specified charset encoder.
Syntax : public OutputStreamWriter(OutputStream out, CharsetEncoder enc)
OutputStreamWriter(OutputStream out, String charsetName) This constructor is used to create new OutputStreamWriter contains the characters stream. This constructor uses a specified string charset.
Syntax : public OutputStreamWriter(OutputStream out, String charsetName) throws UnsupportedEncodingException

Method Detail

  • close() : This method is used to close the stream but it flushes the stream first.

    Syntax : public void close() throws IOException
     
  • flush() : This method is used to flush the stream.

    Syntax : public void flush() throws IOException
     
  • getEncoding() : This method is used to find out the character encoding that the stream is using.

    Syntax : public String getEncoding()
     
  • write(char[] cbuf, int off, int len) : This method is used to write the specified length of characters started form the specified offset of an array of characters to the output stream.

    Syntax : public void write(char[] cbuf, int off, int len) throws IOException
     
  • write(int c) : This method is used to write a character to the output stream.

    Syntax : public void write(int c) throws IOException
     
  • write(String str, int off, int len) : This method is used to write a specified length of string started from the specified offset of a string to the output stream.

    Syntax : public void write(String str, int off, int len) throws IOException

Example

Here an example is being given which will demonstrate about how to use the OutputStreamWriter. A Java class that I have created for demonstrating how to use the OutputStreamWriter. In this class I have used various classes of java.io package for completing this example. As it is discussed that OutputStreamWriter class should be wrapped within BufferedWriter so I have used this class in my example except this the FileOutputStream class is used. Using this example I have tried to write the data to a file. So, when you will executed this example successfully you will see that a file is created with the name (if not existed) and in the directory specified by you.

Source Code

JavaOutputStreamWriterExample.java

import java.io.BufferedWriter;
import java.io.OutputStreamWriter;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class JavaOutputStreamWriterExample
{
   public static void main(String args[])
     {
          OutputStream os = null;
          OutputStreamWriter osw = null;
          BufferedWriter bw = null;
          try
            {
               /*os = new FileOutputStream("test.txt");
               osw = new OutputStreamWriter(os);
               osw.write("Java IO OutputStreamWriter Example");
               */

              os = new FileOutputStream("test.txt");
              osw = new OutputStreamWriter(os); 
              bw = new BufferedWriter(osw);
              bw.write("Hello");
              bw.newLine();
              bw.write("Java IO OutputStreamWriter Example");
	System.out.println("Contents written to the file successfully.");
            }
           catch(IOException ioe)
            {
               System.out.println(ioe);
            }
           finally
            {
                if(os != null)
                  {
                     try
                       {                         
                          bw.flush();
                          bw.close();
                          os.flush();
                          os.close();
	            osw.close();
                       }
                      catch(Exception e)
                       {
                          System.out.println(e);
                       }
                   }                              
          }// finally close
     }// main close
}// class close

Output

When you will compile and execute this example you will get the output as follows :

And to see where the contents has been written go to your directory what you have specified at the programming time and open your file.

Download Source Code

 

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Posted on: December 20, 2012

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