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| /**
| *
| */
| package com.landtool.lanbase.common.utils;
|
| import java.text.SimpleDateFormat;
| import java.util.Date;
| import java.util.Random;
| import java.util.UUID;
|
| import org.apache.commons.lang.StringUtils;
|
| /**
| * @Description: TODO(随机数工具类)
| * @author lanbase
| * @date 2016年10月10日 上午8:50:13
| */
| public class RandomUtils {
|
| private static final Random RANDOM=new Random();
|
| public static Random getRandom() {
| return RANDOM;
| }
|
| private static char[] chars = {
| 'a', 'b', 'c', 'd', 'e', 'f', 'g',
| 'h', 'i', 'j', 'k', 'l', 'm', 'n',
| 'o', 'p', 'q', 'r', 's', 't', 'u',
| 'v', 'w', 'x', 'y', 'z',
| '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
| 'A', 'B', 'C', 'D', 'E', 'F', 'G',
| 'H', 'I', 'J', 'K', 'L', 'M', 'N',
| 'O', 'P', 'Q', 'R', 'S', 'T', 'U',
| 'V', 'W', 'X', 'Y', 'Z'
| };
|
| /**
| * 随机生成由0-9a-zA-Z组合而成的字符串
| *
| * @param len 字符串长度
| * @return 生成结果
| */
| public static String randomChar(int len) {
| StringBuilder shortBuffer = new StringBuilder();
| String uuid = UUID.randomUUID().toString().replace("-", "");
| for (int i = 0; i < len; i++) {
| String str = uuid.substring(i * 4, i * 4 + 4);
| int x = Integer.parseInt(str, 16);
| shortBuffer.append(chars[x % 0x3E]);
| }
| return shortBuffer.toString();
| }
|
| /**
| * 随机数+日期
| * @param startaKey
| * @param endKey
| * @return
| */
| public static String randomKey(String startaKey, String endKey) {
| String simpleDate = new SimpleDateFormat("yyMMddHHmmss").format(new Date());
| String result = simpleDate + randomSixNum();
| if (StringUtils.isNotBlank(startaKey)) {
| result = startaKey + result;
| }
| if (StringUtils.isNotBlank(endKey)) {
| result = result + endKey;
| }
| return result;
| }
|
| public static Integer randomKey(int count) {
| Integer result = getRandom().nextInt(count);
| return result + 1;
| }
|
| /**
| * 随机生成六位随机数
| * @return
| */
| public static int randomSixNum() {
| int randomNum = (int) ((Math.random() * 9 + 1) * 100000);
| return randomNum;
| }
|
| }
|
|
