生成激活码
实现方式
使用 Java 自带的 SecureRandom 类可以生成随机码，用于实现卡券等功能。
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| import java.security.SecureRandom;
import java.util.HashSet;
import java.util.Set;
public class ActivationCodeUtil {
private static final String COMPLEX_CODE = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
private static final String SIMPLE_CODE = "0123456789";
private static final int SWITCH_SIZE = 999;
private static final int CODE_LENGTH = 6;
private static final int MAX_TICKET_NUM = 9999;
public static Set<String> generate(Integer num) {
SecureRandom random = new SecureRandom();
Set<String> result = new HashSet<>();
while (result.size() < num) {
String codeSet = num < SWITCH_SIZE ? SIMPLE_CODE : COMPLEX_CODE;
StringBuilder activationCode = new StringBuilder();
for (int i = 0; i < CODE_LENGTH; i++) {
int index = random.nextInt(codeSet.length());
activationCode.append(codeSet.charAt(index));
}
result.add(activationCode.toString());
}
return result;
}
}
|