java guid int64_java生成GUID代码

package fops.presentation;

import java.io.IOException;import java.net.InetAddress;import java.net.UnknownHostException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.util.Random;

import com.lutris.appserver.server.httpPresentation.HttpPresentation;import com.lutris.appserver.server.httpPresentation.HttpPresentationComms;import com.lutris.appserver.server.httpPresentation.HttpPresentationException;

public class guid implements HttpPresentation {

public String valueBeforeMD5 = "";   public String valueAfterMD5 = "";   private static Random myRand;   private static SecureRandom mySecureRand;

private static String s_id;   private static final int PAD_BELOW = 0x10;   private static final int TWO_BYTES = 0xFF;

static {      mySecureRand = new SecureRandom();      long secureInitializer = mySecureRand.nextLong();      myRand = new Random(secureInitializer);      try {         s_id = InetAddress.getLocalHost().toString();      } catch (UnknownHostException e) {         e.printStackTrace();      }

}

public guid() {      getRandomGUID(false);   }

public guid(boolean secure) {      getRandomGUID(secure);   }

   private void getRandomGUID(boolean secure) {      MessageDigest md5 = null;      StringBuffer sbValueBeforeMD5 = new StringBuffer(128);

try {         md5 = MessageDigest.getInstance("MD5");      } catch (NoSuchAlgorithmException e) {       // logger.error("Error: " + e);      }

try {         long time = System.currentTimeMillis();         long rand = 0;

if (secure) {            rand = mySecureRand.nextLong();         } else {            rand = myRand.nextLong();         }         sbValueBeforeMD5.append(s_id);         sbValueBeforeMD5.append(":");         sbValueBeforeMD5.append(Long.toString(time));         sbValueBeforeMD5.append(":");         sbValueBeforeMD5.append(Long.toString(rand));

valueBeforeMD5 = sbValueBeforeMD5.toString();         md5.update(valueBeforeMD5.getBytes());

byte[] array = md5.digest();         StringBuffer sb = new StringBuffer(32);         for (int j = 0; j < array.length; ++j) {            int b = array[j] & TWO_BYTES;            if (b < PAD_BELOW)               sb.append('0');            sb.append(Integer.toHexString(b));         }

valueAfterMD5 = sb.toString();

} catch (Exception e) {        // logger.error("Error:" + e);      }   }

   public String toString() {      String raw = valueAfterMD5.toUpperCase();      StringBuffer sb = new StringBuffer(64);      sb.append(raw.substring(0, 8));      sb.append("-");      sb.append(raw.substring(8, 12));      sb.append("-");      sb.append(raw.substring(12, 16));      sb.append("-");      sb.append(raw.substring(16, 20));      sb.append("-");      sb.append(raw.substring(20));

return sb.toString();   }

public void run(HttpPresentationComms comms)   throws HttpPresentationException, IOException {           guid myGUID = new guid();     //     System.out.println("Seeding String=" + myGUID.valueBeforeMD5);     //     System.out.println("rawGUID=" + myGUID.valueAfterMD5);"RandomGUID="          System.out.println( myGUID.toString());   }

}

1.5版本以后加入了java.util.uuid;

直接这样好了

UUID uuid = UUID.randomUUID();System.out.println("{"+uuid.toString()+"}");