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atomTool核心工具包，包括集合、字符串、Bean等工具类
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package cn.atomtool.captcha.word;
import java.util.Random;
public class AdaptiveRandomWordFactory extends RandomWordFactory {
protected String wideCharacters;
public void setWideCharacters(String wideCharacters) {
this.wideCharacters = wideCharacters;
}
public AdaptiveRandomWordFactory() {
characters = "absdegkmnopwx23456789";
wideCharacters = "mw";
}
@Override
public String getNextWord() {
Random rnd = new Random();
StringBuffer sb = new StringBuffer();
StringBuffer chars = new StringBuffer(characters);
int l = minLength + (maxLength > minLength ? rnd.nextInt(maxLength - minLength) : 0);
for (int i = 0; i < l; i++) {
int j = rnd.nextInt(chars.length());
char c = chars.charAt(j);
if (wideCharacters.indexOf(c) != -1) {
for (int k = 0; k < wideCharacters.length(); k++) {
int idx = chars.indexOf(String.valueOf(wideCharacters.charAt(k)));
if (idx != -1) {
chars.deleteCharAt(idx);
}
}
}
sb.append(c);
}
return sb.toString();
}
}