package com.javaweb.common.utils;
|
|
import java.security.SecureRandom;
|
import java.util.UUID;
|
|
public class IdGenerate {
|
|
private static SecureRandom random = new SecureRandom();
|
private static IdWorker idWorker = new IdWorker(-1, -1);
|
|
/**
|
* 生成UUID, 中间无-分割.
|
*/
|
public static String uuid() {
|
return UUID.randomUUID().toString().replaceAll("-", "");
|
}
|
|
/**
|
* 使用SecureRandom随机生成Long.
|
*/
|
public static long randomLong() {
|
return Math.abs(random.nextLong());
|
}
|
|
/**
|
* 基于Base62编码的SecureRandom随机生成bytes.
|
*/
|
// public static String randomBase62(int length) {
|
// byte[] randomBytes = new byte[length];
|
// random.nextBytes(randomBytes);
|
// return EncodeUtils.encodeBase62(randomBytes);
|
// }
|
|
/**
|
* 使用SecureRandom随机生成指定范围的Integer.
|
*/
|
public static int randomInt(int min, int max) {
|
return random.nextInt(max) % (max - min + 1) + min;
|
}
|
|
/**
|
* 获取新唯一编号（18为数值）
|
* 来自于twitter项目snowflake的id产生方案，全局唯一，时间有序。
|
* 64位ID (42(毫秒)+5(机器ID)+5(业务编码)+12(重复累加))
|
*/
|
public static String nextId() {
|
return String.valueOf(idWorker.nextId());
|
}
|
|
/**
|
* 获取新代码编号
|
*/
|
public static String nextCode(String code){
|
if (code != null){
|
String str = code.trim();
|
int len = str.length() - 1;
|
int lastNotNumIndex = 0;
|
for (int i = len; i >= 0; i--) {
|
if (!(str.charAt(i) >= '0' && str.charAt(i) <= '9')) {
|
lastNotNumIndex = i;
|
break;
|
}
|
}
|
// 如果最后一位是数字，并且last索引位置还在最后，则代表是纯数字，则最后一个不是数字的索引为-1
|
if ((str.charAt(len) >= '0' && str.charAt(len) <= '9') && (lastNotNumIndex == len)) {
|
lastNotNumIndex = -1;
|
}
|
String prefix = str.substring(0, lastNotNumIndex + 1);
|
String numStr = str.substring(lastNotNumIndex + 1, str.length());
|
long num = NumberUtils.isCreatable(numStr) ? Long.valueOf(numStr) : 0;
|
// System.out.println("处理前："+str);
|
str = prefix + StringUtils.leftPad(String.valueOf(num + 1), numStr.length(), "0");
|
// System.out.println("处理后："+str);
|
return str;
|
}
|
return null;
|
}
|
|
// public static void main(String[] args) {
|
// System.out.println(uuid());
|
// System.out.println(nextId());
|
// System.out.println(nextCode("8"));
|
// System.out.println(nextCode("09"));
|
// System.out.println(nextCode("009"));
|
// System.out.println(nextCode("E09"));
|
// System.out.println(nextCode("EC09"));
|
// System.out.println(nextCode("EC0101"));
|
// System.out.println(nextCode("EC0109"));
|
// System.out.println(nextCode("EC02T03"));
|
// System.out.println(nextCode("EC02T099"));
|
// System.out.println(nextCode("EC02T100"));
|
// System.out.println(nextCode("EC02T10A"));
|
// System.out.println(nextCode("1123117153417957377"));
|
//// // 数值型ID重复验证测试
|
//// Set<String> set = SetUtils.newHashSet();
|
//// try{
|
//// for (int i=0; i<100; i++){
|
//// String id = String.valueOf(nextId());
|
//// if (set.contains(id)){
|
//// throw new Exception(id + " exists");
|
//// }
|
//// set.add(id);
|
//// System.out.println(id);
|
//// Thread.sleep(100);
|
//// }
|
//// }catch (Exception e) {
|
//// e.printStackTrace();
|
//// }
|
// }
|
|
}
|
