com.wudaosoft.commons.utils.IdGenerator Maven / Gradle / Ivy
/*
* Copyright(c)2010-2012 WUDAOSOFT.COM
*
* Email:[email protected]
*
* QQ:275100589
*/
package com.wudaosoft.commons.utils;
import java.net.InetAddress;
/**
* ID生成器
* @author Changsoul.Wu
* @date 2012-8-11 下午3:33:38
*/
public class IdGenerator {
private static final int IP;
static {
int ipadd;
try {
ipadd = toInt(InetAddress.getLocalHost().getAddress());
} catch (Exception e) {
ipadd = 0;
}
IP = ipadd;
}
private static short counter = (short) 0;
private static final int JVM = (int) (System.currentTimeMillis() >>> 8);
private static String sep = "";
public static String getSeparator() {
return sep;
}
public void setSeparator(String separator) {
sep = (separator == null ? "" : separator);
}
public static String generate() {
return new StringBuffer(36).append(format(getIP())).append(sep)
.append(format(getJVM())).append(sep)
.append(format(getHiTime())).append(sep)
.append(format(getLoTime())).append(sep)
.append(format(getCount())).toString().toUpperCase();
}
protected static int getJVM() {
return JVM;
}
protected static short getCount() {
synchronized (IdGenerator.class) {
if (counter < 0)
counter = 0;
return counter++;
}
}
protected static int getIP() {
return IP;
}
protected static short getHiTime() {
return (short) (System.currentTimeMillis() >>> 32);
}
protected static int getLoTime() {
return (int) System.currentTimeMillis();
}
private static int toInt(byte[] bytes) {
int result = 0;
for (int i = 0; i < 4; i++) {
result = (result << 8) - Byte.MIN_VALUE + (int) bytes[i];
}
return result;
}
protected static String format(int intval) {
String formatted = Integer.toHexString(intval);
StringBuffer buf = new StringBuffer("00000000");
buf.replace(8 - formatted.length(), 8, formatted);
return buf.toString();
}
protected static String format(short shortval) {
String formatted = Integer.toHexString(shortval);
StringBuffer buf = new StringBuffer("0000");
buf.replace(4 - formatted.length(), 4, formatted);
return buf.toString();
}
}