代码如下
package XXXXX;
import java.security.SecureRandom;
import java.util.Random;
/**
* 作用：用于发送短信验证码 <br>
* 使用场景：找回密码
*
* @date Created by SPACE on 2018-8-15
*/
public class DxyzmService {
private static final String SYMBOLS = "0123456789"; // 数字
// 字符串
// private static final String SYMBOLS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static final Random RANDOM = new SecureRandom();
public static void main(String[] args) {
System.out.println(getNonce_str());
}
/**
* 获取长度为 6 的随机数字
* @return 随机数字
* @date 修改日志：由 space 创建于 2018-8-2 下午2:43:51
*/
public static String getNonce_str() {
// 如果需要4位，那 new char[4] 即可，其他位数同理可得
char[] nonceChars = new char[6];
for (int index = 0; index < nonceChars.length; ++index) {
nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));
}
return new String(nonceChars);
}
} // end class.
