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Reader and Writer classes are character oriented stream classes. These can be used to read and convert Unicode characters.
Conversion
Following example will showcase conversion of a Unicode String to UTF8 byte[] and UTF8 byte[] to Unicode byte[] using Reader and Writer classes.
Example
import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Reader; import java.io.Writer; import java.nio.charset.Charset; import java.text.ParseException; public class I18NTester { public static void main(String[] args) throws ParseException, IOException { String input = "This is a sample text" ; InputStream inputStream = new ByteArrayInputStream(input.getBytes()); //get the UTF-8 data Reader reader = new InputStreamReader(inputStream, Charset.forName("UTF-8")); //convert UTF-8 to Unicode int data = reader.read(); while(data != -1){ char theChar = (char) data; System.out.print(theChar); data = reader.read(); } reader.close(); System.out.println(); //Convert Unicode to UTF-8 Bytes ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); Writer writer = new OutputStreamWriter(outputStream, Charset.forName("UTF-8")); writer.write(input); writer.close(); String out = new String(outputStream.toByteArray()); System.out.println(out); } }
Output
It will print the following result.
This is a sample text This is a sample text
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