/**
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* Copyright © 2015-2020 <a href="http://www.jeeplus.org/">JeePlus</a> All rights reserved.
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*/
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package com.jeeplus.common.utils;
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import java.io.Serializable;
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import java.security.SecureRandom;
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import java.util.UUID;
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import org.apache.shiro.session.Session;
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import org.apache.shiro.session.mgt.eis.SessionIdGenerator;
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import org.springframework.context.annotation.Lazy;
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import org.springframework.stereotype.Service;
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/**
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* 封装各种生成唯一性ID算法的工具类.
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* @author jeeplus
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* @version 2013-01-15
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*/
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@Service
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@Lazy(false)
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public class IdGen implements SessionIdGenerator {
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private static SecureRandom random = new SecureRandom();
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/**
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* 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
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*/
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public static String uuid() {
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return UUID.randomUUID().toString().replaceAll("-", "");
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}
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/**
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* 使用SecureRandom随机生成Long.
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*/
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public static long randomLong() {
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return Math.abs(random.nextLong());
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}
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/**
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* 基于Base62编码的SecureRandom随机生成bytes.
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*/
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public static String randomBase62(int length) {
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byte[] randomBytes = new byte[length];
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random.nextBytes(randomBytes);
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return Encodes.encodeBase62(randomBytes);
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}
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@Override
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public Serializable generateId(Session session) {
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return IdGen.uuid();
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}
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public static void main(String[] args) {
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System.out.println(IdGen.uuid());
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System.out.println(IdGen.uuid().length());
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for (int i=0; i<1000; i++){
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System.out.println(IdGen.randomLong() + " " + IdGen.randomBase62(5));
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}
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}
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}
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