封装各种生成唯一性ID算法的工具类

/**
* Copyright (c) 2005-2012 springside.org.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
*/
package com.minxinloan.common.utils;

import java.security.SecureRandom;
import java.util.UUID;

/**
* 封装各种生成唯一性ID算法的工具类.
* @author calvin
* @version 2013-01-15
*/
public class Identities {

private static SecureRandom random = new SecureRandom();

/**
* 封装JDK自带的UUID, 通过Random数字生成, 中间有-分割.
*/
public static String uuid() {
return UUID.randomUUID().toString();
}

/**
* 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
*/
public static String uuid2() {
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 Encodes.encodeBase62(randomBytes);
}
}