InputStreamReader & OutputStreamWriter – UTF file (example)

• Given the UTF contents, read & write utf contents using InputStreamReader & OutputStreamWriter.
• We have already discussed similar posts:
  • Read & write UTF file – BufferReader & BufferWriter (using NIO)
  • Read & write contents (without UTF) using InputStreamReader/OutputStreamWriter

In this post, we will demonstrate read and write operation with UTF-8 contents.

Read write utf file – InputStreamReader & OutputStreamWriter

package org.learn.utf.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class SteamReaderWriter {
	public static void main(String[] args) throws IOException {
		writeUTFUsingStreamWriter();
		readUTFUsingStreamReader();
	}

	private static void writeUTFUsingStreamWriter() throws IOException {
		System.out.println("1. Start writting contents to file - OutputStreamWriter");
		String newLine = System.getProperty("line.separator");
		try (FileOutputStream fileStream = new FileOutputStream(new File("sampleUTFFile.txt"));
				OutputStreamWriter writer = new OutputStreamWriter(fileStream, "UTF-8")) {
			writer.write("Names of Jackie Chan:");
			writer.write(newLine);
			writer.write("房仕龍 (Fong Si-lung)");
			writer.write(newLine);
			writer.write("元樓 (Yuen Lou)");
			writer.write(newLine);
			writer.write("大哥 (Big Brother)");
			writer.write(newLine);
		}
		System.out.println("2. Successfully written contents to file - OutputStreamWriter");
	}

	private static void readUTFUsingStreamReader() throws IOException {
		try (FileInputStream fileStream = new FileInputStream(new File("sampleUTFFile.txt"));
				InputStreamReader reader = new InputStreamReader(fileStream, "UTF-8")) {
			
			System.out.println("\n3. Start Reading file using InputStreamReader:");
			int character;			 
            while ((character = reader.read()) != -1) {
                System.out.print((char) character);
            }
            System.out.println("4. End Reading file using InputStreamReader");
		}
	}
}

The content of sampleUTFFile.txt is as follows:

O/P: Read write file – InputStreamReader & OutputStreamWriter

1. Start writting contents to file - OutputStreamWriter
2. Successfully written contents to file - OutputStreamWriter

3. Start Reading file using InputStreamReader:
Names of Jackie Chan:
房仕龍 (Fong Si-lung)
元樓 (Yuen Lou)
大哥 (Big Brother)
4. End Reading file using InputStreamReader