细聊分布式ID生成方法的实现（一个可以使用10年的序列生成器）

package com.gym.core.common;

import java.util.concurrent.atomic.AtomicInteger;

import org.apache.commons.lang.StringUtils;

import com.gym.core.date.DateContants.DateFormatType;

import com.gym.core.date.DateParseUtils;

/**

*

* @author wangxinchun1988@163.com

* @date 2016-3-5 下午3:04:41

*/

public class SequenceIdGenerateUtils {

private static final long BEGIN_DATE = DateParseUtils.convertDate("2016-01-01", DateFormatType.YYYY_MM_DD).getTime();

private static final int localMachineAppend = Integer.parseInt(DnsUtil.getHostAddress().split("\\.")[3]);

private static AtomicInteger atomicInteger = new AtomicInteger(0);

public static long generate(int businessType){

StringBuilder binaryStr = new StringBuilder("0");

binaryStr.append(wrapTimeBinaryStr());

binaryStr.append(wrapBusinessBinaryStr(businessType));

binaryStr.append(wrapRoomBinaryStr(1));

binaryStr.append(wrapMachineBinaryStr(localMachineAppend));

binaryStr.append(wrapSequencePeyMachine());

return Long.parseLong(binaryStr.toString(), 2);

}

/**

* 39 bit */

private static String wrapTimeBinaryStr(){

long currentTime = System.currentTimeMillis();

long timeElipse = currentTime - BEGIN_DATE;

return StringUtils.leftPad(Long.toBinaryString(timeElipse),39,'0');

}

/**

* 10 bit

*/

private static String wrapMachineBinaryStr(int machineIp){

return StringUtils.leftPad(Integer.toBinaryString(machineIp), 10, '0');

}

/**

* 5 bit

*/

private static String wrapBusinessBinaryStr(int businessType){

return StringUtils.leftPad(Integer.toBinaryString(businessType), 5, '0');

}

/**

* 4 bit

*/

private static String wrapRoomBinaryStr(int room){

return StringUtils.leftPad(Integer.toBinaryString(room), 4, '0');

}

/**

* 5 bit

*/

private static String wrapSequencePeyMachine(){

if(atomicInteger.get() == Integer.MAX_VALUE){

atomicInteger = new AtomicInteger();

}

return StringUtils.leftPad(Integer.toBinaryString(atomicInteger.incrementAndGet() % 32), 5,'0');

}

}