cn.apiclub.captcha.text.producer.DefaultTextProducer Maven / Gradle / Ivy
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package cn.apiclub.captcha.text.producer;
import java.security.SecureRandom;
import java.util.Random;
/**
* Produces text of a given length from a given array of characters.
*
* @author James Childers
*
*/
public class DefaultTextProducer implements TextProducer {
private static final Random RAND = new SecureRandom();
private static final int DEFAULT_LENGTH = 5;
private static final char[] DEFAULT_CHARS = new char[] { 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'k', 'm', 'n', 'p', 'r', 'w', 'x', 'y',
'2', '3', '4', '5', '6', '7', '8', };
private final int _length;
private final char[] _srcChars;
public DefaultTextProducer() {
this(DEFAULT_LENGTH, DEFAULT_CHARS);
}
public DefaultTextProducer(int length, char[] srcChars) {
_length = length;
_srcChars = copyOf(srcChars, srcChars.length);
}
@Override
public String getText() {
String capText = "";
for (int i = 0; i < _length; i++) {
capText += _srcChars[RAND.nextInt(_srcChars.length)];
}
return capText;
}
private static char[] copyOf(char[] original, int newLength) {
char[] copy = new char[newLength];
System.arraycopy(original, 0, copy, 0,
Math.min(original.length, newLength));
return copy;
}
}
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