How to write UTF-8 encoded data into a file

Here’s the Java example to demonstrate how to write UTF-8 encoded data into a text file – “c:\\temp\\test.txt”

P.S Symbol “??” is some “UTF-8″ data in Chinese and Japanese

package com.mkyong;
 
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
 
public class test {
	public static void main(String[] args){
 
	  try {
		File fileDir = new File("c:\\temp\\test.txt");
 
		Writer out = new BufferedWriter(new OutputStreamWriter(
			new FileOutputStream(fileDir), "UTF8"));
 
		out.append("Website UTF-8").append("\r\n");
		out.append("?? UTF-8").append("\r\n");
		out.append("??????? UTF-8").append("\r\n");
 
		out.flush();
		out.close();
 
	    } 
	   catch (UnsupportedEncodingException e) 
	   {
		System.out.println(e.getMessage());
	   } 
	   catch (IOException e) 
	   {
		System.out.println(e.getMessage());
	    }
	   catch (Exception e)
	   {
		System.out.println(e.getMessage());
	   } 
	}	
}

Result

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dongbangws says:

April 23, 2010 at 5:13 pm

String UTF8Str = new String(s.getBytes(), “UTF8?);

ShouldBE? String UTF8Str = new String(s.getBytes(“UTF8?));

ganba says:

July 29, 2009 at 4:51 pm

Hello there,
This code does not really work for me.
Here’s how I tested it. My test.txt file is saved with UTF-8 encoding and contains this line:
—————
w été jedn? stron? ôpèç Ûg ütà
—————

My test program below first reads the file in BufferedReader and then writes in Writer.

—————
package test;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;

public class Test_temp {

public Test_temp() {

String sPath = “E:/workspace/project/src/test/test.txt”;

if (sPath != null && !sPath.trim().equals(“”)) {
try {
Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(sPath + “.new”), “UTF8″));
BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(sPath), “UTF8″));

String s = null;
while ((s = in.readLine()) != null) {
String UTF8Str = new String(s.getBytes(), “UTF8″);
System.out.println(“[" + UTF8Str + "]“);
out.append(UTF8Str).append(“\r\n”);
}
System.out.println(“Reading Process Completly Successfully.”);
in.close();
out.flush();
out.close();
} catch (UnsupportedEncodingException ue) {
System.out.println(“Not supported : ” + ue.getMessage());
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
}

public static void main(String[] args) {
new Test_temp();
}
}
—————

The new generated file (test.txt.new) is also encoded with UTF-8 but characters are corrupted:
———–
?w ?t? jedn? stron? ?p?? ?g ?
———–
Could you please tell me what do I do wrong?
Thanks