Below java shows how to detect non-ASCII characters in a String –
/****************************************************************************************
* Created on 03-2012 Copyright(c) https://kodehelp.com All Rights Reserved.
****************************************************************************************/
package com.kodehelp.javaio;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.util.Arrays;
/**
* Created by https://kodehelp.com Date: 3/18/12
*/
public class FindNonAsciiCharacters {
public static void main(String[] args) {
byte[] invalidBytes = "Copyright © 2009-2012 kodehelp.co.in".getBytes();
byte[] validBytes = "Copyright (c) 2009-2012 kodehelp.co.in".getBytes();
CharsetDecoder decoder = Charset.forName("US-ASCII").newDecoder();
try {
CharBuffer buffer = decoder.decode(ByteBuffer.wrap(validBytes));
System.out.println(Arrays.toString(buffer.array()));
buffer = decoder.decode(ByteBuffer.wrap(invalidBytes));
System.out.println(Arrays.toString(buffer.array()));
} catch (CharacterCodingException e) {
System.err.println("The information contains a non ASCII character(s).");
e.printStackTrace();
}
}
}