Java令牌生成器

 package Token;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.Random;
 import Decoder.BASE64Encoder;

 //令牌生产器
 public class TokenProcessor {
     private TokenProcessor(){}
     private static TokenProcessor instance = new TokenProcessor();
     public static TokenProcessor getInstance(){
         return instance;
     }
     public String generateTokeCode(){
         String value = System.currentTimeMillis()+new Random().nextInt()+"";
         System.out.println(value); 

         long currentTime = System.currentTimeMillis();
         SimpleDateFormat formatter = new SimpleDateFormat("yyyy年-MM月dd日-HH时mm分ss秒");
         Date date = new Date(currentTime);
         System.out.println(formatter.format(date));

         //获取数据指纹，指纹是唯一的
         try {
             MessageDigest md = MessageDigest.getInstance("md5");
             byte[] b = md.digest(value.getBytes());//产生数据的指纹
             //Base64编码
             BASE64Encoder be = new BASE64Encoder();
             be.encode(b);
             System.out.println(be.encode(b));
             return be.encode(b);//制定一个编码
         } catch (NoSuchAlgorithmException e){
             e.printStackTrace();
         }
         return null;
     }
     public static void main(String[] args) {
         TokenProcessor processor=new TokenProcessor();
         processor.generateTokeCode();
     }
 }