Read UTF-8 Encoded Data in java

In this post, we will see how to read UTF-8 Encoded Data.

Sometimes, we have to deal with UTF-8 Encoded Data in our application. It may be due localization or may be processing data from user input.

There are multiple ways to read UTF-8 Encoded Data in Java.
[toc]

Using Files’s newBufferedReader()

We can use java.nio.file.Files's newBufferedReader() to read UTF8 data to String.

package org.arpit.java2blog;

import java.io.BufferedReader;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;

public class ReadUTF8NewBufferReaderMain {

    public static void main(String[] args) {
        readUTF8UsingnewBufferReader();
    }

    // using newBufferedReader method of java.nio.file.Files
    public static void readUTF8UsingnewBufferReader() {
        Path path = FileSystems.getDefault().getPath("/users/apple/WriteUTF8newBufferWriter.txt");
        Charset charset = Charset.forName("UTF-8");
        try {
            BufferedReader read = Files.newBufferedReader(path, charset);
            String line = null;
            while ((line = read.readLine()) != null) {
                System.out.println(line);
            }
            read.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Output:

Please note that WriteUTF8newBufferWriter.txt was written from this example.

Using BufferedReader

We need to pass encoding as UTF8 while creating new InputStreamReader.

package org.arpit.java2blog;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

public class ReadUTF8DataMain {
    public static void main(String[] args) {
        try {
            File utf8FilePath = new File("/users/apple/UTFDemo.txt");

            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(new FileInputStream(utf8FilePath), "UTF8"));

            String line = null;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            reader.close();

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }
}

Output:

Please note that UTFDemo.txt was written from this example.

Using DataInputStream’s readUTF() method

We can use DataInputStream readUTF() to read UTF8 data to file.

package org.arpit.java2blog;

import java.io.DataInputStream;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.IOException;

public class ReadUTFDataMain {

    public static void main(String[] args) {
        try {
            FileInputStream fis = new FileInputStream("/users/apple/WriteUTFDemo.txt");
            DataInputStream dis = new DataInputStream(fis);
            String utf8FileData = dis.readUTF();
            System.out.println(utf8FileData);
            dis.close();
        } catch (EOFException ex) {
            System.out.println(ex.toString());
        } catch (IOException ex) {
            System.out.println(ex.toString());
        }
    }
}

Please note that WriteUTFDemo.txt was written from this example.

That’s all about how to write UTF-8 Encoded Data in java