Java令牌生成器

 1 package Token;
 2 import java.security.MessageDigest;
 3 import java.security.NoSuchAlgorithmException;
 4 import java.text.SimpleDateFormat;
 5 import java.util.Date;
 6 import java.util.Random;
 7 import Decoder.BASE64Encoder;
 8 
 9 //令牌生产器
10 public class TokenProcessor {
11     private TokenProcessor(){}
12     private static TokenProcessor instance = new TokenProcessor();
13     public static TokenProcessor getInstance(){
14         return instance;
15     }
16     public String generateTokeCode(){
17         String value = System.currentTimeMillis()+new Random().nextInt()+"";
18         System.out.println(value); 
19         
20         
21         long currentTime = System.currentTimeMillis();
22         SimpleDateFormat formatter = new SimpleDateFormat("yyyy年-MM月dd日-HH时mm分ss秒");
23         Date date = new Date(currentTime);
24         System.out.println(formatter.format(date));
25         
26 
27         //获取数据指纹，指纹是唯一的
28         try {
29             MessageDigest md = MessageDigest.getInstance("md5");
30             byte[] b = md.digest(value.getBytes());//产生数据的指纹
31             //Base64编码
32             BASE64Encoder be = new BASE64Encoder();
33             be.encode(b);
34             System.out.println(be.encode(b)); 
35             return be.encode(b);//制定一个编码
36         } catch (NoSuchAlgorithmException e){
37             e.printStackTrace();
38         }
39         return null;
40     }
41     public static void main(String[] args) {
42         TokenProcessor processor=new TokenProcessor();
43         processor.generateTokeCode();
44     }
45 }