Introduction
The Java.io OutputStreamWriter is the class used to convert the character (which is in the form of text) into the bytes. Here the text will be in UTF - 8 format, so to read the characters in that format use output stream writer which will wraps the output stream.
Conceptual
figure
Declaration
Java.io OutputStreamWriter class is declared below:
Public abstract class Java.io OutputStreamWriter extends Writer Fields
Java.io OutputStreamWriter class fields are:
- Protected Object Lock : For synchronize operations this object is used in OutputStreamWriter.
Table
| Constructor | Description |
|---|---|
| OutputStreamWriter(OutputStream out) | The function of this constructor is to create the output stream writer instance. |
| OutputStreamWriter(OutputStream out, Charset cs) | The function of this constructor is to create the output stream writer instance with specified charset. |
| OutputStreamWriter(OutputStream out, String CharsetName ) | The function of this constructor is to create the output stream writer instance with specified name of charset. |
Table
| Method | Description |
|---|---|
| void close () | The function of this method is to close the present stream and associated to input stream systems resources are released. |
| void flush () | The function of this method is to flush the specified output stream. |
| void write (int c) | The function of this method is to write the represented character into output stream |
| String getEncoding() | The function of this method is to get the name of encoded character which was used by this input stream. |
| void write (Char[] cbuf, int off, int n) | By using this method it writes the data up to ‘n’ bytes from the output stream to an array of characters. |
Description
From the following classes, methods are inherited to the output stream writer class.
- Java.io.Object
- Java.io.Writer
Example
Following is an example for Java.io OutputStreamWriter.
JavaOutputStreamWriterExample.java
[java]import java.io.OutputStreamWriter;
import java.io.OutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class JavaOutputStreamWriterExample
{
public static void main(String args[])
{
OutputStreamWriter osWriter = null;
OutputStream outStream = null;
File outputFile = null;
String str1 = "Hello Java.";
String str2 = "Java IO is fun.";
try{
outputFile = new File("E:\\splesson.txt");
outStream = new FileOutputStream(outputFile);
osWriter = new OutputStreamWriter(outStream);
System.out.println("Writing data in file..!!");
osWriter.write(str1);
osWriter.append(str2);
System.out.println("Data successfully written in file..!!");
}
catch(IOException e)
{
System.out.println("Exception caught..!!");
e.printStackTrace();
}
finally
{
try
{//closing objects
System.out.println("Flushing object..!!");
outStream.flush();
osWriter.flush();
System.out.println("Closing object..!!");
outStream.close();
osWriter.close();
}
catch(IOException ioe)
{
System.out.println("IOException caught..!!");
ioe.printStackTrace();
}
}
}
}
[/java]
Java OutputStreamWriter is useful in encoding a character streams to byte streams. The bytes are encoded using the specified charset. It can use a user defined charset or system’s default charset. One must wrap OutputStreamWriter within a java BufferedWriter class, it is a good practice and it also improves program efficiency. Those strings will be stored in the given file.
Output
Following is the text will be displayed in the console.
[java]Writing data in file..!!
Data successfully written in file..!!
Flushing object..!!
Closing object..!!
[/java]
Now check the data in the file.
[java]Hello Java.Java IO is fun.[/java]
Key Points
- The output stream writer is the class used to convert the character (which is in the form of text) into the bytes.
- Here the text will be in UTF - 8 format, so to read the characters in that format use output stream writer which will wraps the output stream.