net.ymate.platform.commons.util.UUIDUtils Maven / Gradle / Ivy
/*
* Copyright 2007-2107 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.ymate.platform.commons.util;
import java.util.Random;
import java.util.UUID;
/**
*
* UUIDUtils
*
*
* UUID生成器；
*
*
* @author 刘镇([email protected])
* @version 0.0.0
*
*
* 版本号 动作 修改人 修改时间
*
*
*
* 0.0.0
* 创建类
* 刘镇
* 2010-10-20下午02:02:40
*
*
*/
public class UUIDUtils {
private static final String __randChars = "0123456789abcdefghigklmnopqrstuvtxyzABCDEFGHIGKLMNOPQRSTUVWXYZ";
private final static String chars64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789^~abcdefghijklmnopqrstuvwxyz";
private final static Random __random = new Random(System.currentTimeMillis());
/**
* 返回一个唯一的16位字符串。 基于： 32位当前时间，32位对象的identityHashCode和32位随机数
*
* @param o Object对象
* @return 一个16位长度的字符串
*/
public final static String generateCharUUID(Object o) {
long id1 = System.currentTimeMillis() & 0xFFFFFFFFL;
long id2 = System.identityHashCode(o);
long id3 = randomLong(-0x80000000L, 0x80000000L) & 0xFFFFFFFFL;
id1 <<= 16;
id1 += (id2 & 0xFFFF0000L) >> 16;
id3 += (id2 & 0x0000FFFFL) << 32;
String out = __convert(id1, 6, chars64) + __convert(id3, 6, chars64);
out = out.replaceAll(" ", "o");
return out;
}
public final static String generateNumberUUID(Object o) {
long id1 = System.currentTimeMillis() & 0xFFFFFFFFL;
long id2 = System.identityHashCode(o);
long id3 = randomLong(-0x80000000L, 0x80000000L) & 0xFFFFFFFFL;
id1 <<= 16;
id1 += (id2 & 0xFFFF0000L) >> 16;
id3 += (id2 & 0x0000FFFFL) << 32;
return "" + id1 + id3;
}
public final static String generatePrefixHostUUID(Object o) {
long id1 = System.currentTimeMillis() & 0xFFFFFFFFL;
long id2 = System.identityHashCode(o);
long id3 = randomLong(-0x80000000L, 0x80000000L) & 0xFFFFFFFFL;
id1 <<= 16;
id1 += (id2 & 0xFFFF0000L) >> 16;
id3 += (id2 & 0x0000FFFFL) << 32;
return IPAddressUtils.getLocalHostName() + "@" + id1 + id3;
}
/**
* 返回10个随机字符（基于目前时间和一个随机字符串）
*
* @return String
*/
public final static String generate() {
long id1 = System.currentTimeMillis() & 0x3FFFFFFFL;
long id3 = randomLong(-0x80000000L, 0x80000000L) & 0x3FFFFFFFL;
String out = __convert(id1, 6, chars64) + __convert(id3, 6, chars64);
out = out.replaceAll(" ", "o");
return out;
}
/**
* @return 返回采用JDK自身UUID生成器生成主键并替换 '-' 字符
*/
public final static String uuid() {
return UUID.randomUUID().toString().replace("-", "");
}
/**
* Converts number to string
*
* @param x value to convert
* @param n conversion base
* @param d string with characters for conversion.
* @return converted number as string
*/
private static String __convert(long x, int n, String d) {
if (x == 0) {
return "0";
}
String r = "";
int m = 1 << n;
m--;
while (x != 0) {
r = d.charAt((int) (x & m)) + r;
x = x >>> n;
}
return r;
}
///-------------------------------------------------
/**
* 生成随机字符串
*
* @param length 长度
* @param isOnlyNum 是否仅使用数字
* @return
*/
public static String randomString(int length, boolean isOnlyNum) {
int size = isOnlyNum ? 10 : 62;
StringBuffer hash = new StringBuffer(length);
for (int i = 0; i < length; i++) {
hash.append(__randChars.charAt(__random.nextInt(size)));
}
return hash.toString();
}
/**
* Generates pseudo-random long from specific range. Generated number is
* great or equals to min parameter value and less then max parameter value.
*
* @param min lower (inclusive) boundary
* @param max higher (exclusive) boundary
*
* @return pseudo-random value
*/
public static long randomLong(long min, long max) {
return min + (long) (Math.random() * (max - min));
}
/**
* Generates pseudo-random integer from specific range. Generated number is
* great or equals to min parameter value and less then max parameter value.
*
* @param min lower (inclusive) boundary
* @param max higher (exclusive) boundary
*
* @return pseudo-random value
*/
public static int randomInt(int min, int max) {
return min + (int) (Math.random() * (max - min));
}
}