Myeclipse 6.0代码

import java.util.*; import java.io.*;

public class bbs

{

private static final String LL = "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.";

public static void main(String[] args)
  { 
   try {            
    System.out.println("please input register name:");            
    BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    String userId = null;            
    userId = reader.readLine();           
    bbs myeclipsegen = new bbs();            
    String res = myeclipsegen.getSerial(userId, "20");            
    System.out.println("Serial:" + res);            
    reader.readLine();       
   }
   catch (IOException ex)
   {  
   
   } 
  }

private int decode(String s)
    {         
     int i;         
     char[] ac;        
     int j;         
     int k;         
     i = 0;        
     ac = s.toCharArray();         
     j = 0;         
     k = ac.length;         
     while (j < k)
     {             
      i = (31 * i) + ac[j];             
      j++;         
     }        
     return Math.abs(i);     
     
    }

private String change(String s)
    {         
     byte[] abyte0;         
     char[] ac;         
     int i;         
     int k;         
     int j;         
     abyte0 = s.getBytes();         
     ac = new char[s.length()];         
     i = 0;         
     k = abyte0.length;         
     while (i < k)
     {             
      j = abyte0[i];             
      if ((j >= 48) && (j <= 57))
      {                 
       j = (((j - 48) + 5) % 10) + 48;             
      }
      else if ((j >= 65) && (j <= 90))
      {                 
       j = (((j - 65) + 13) % 26) + 65;            
      }
      else if ((j >= 97) && (j <= 122))
      {                 
       j = (((j - 97) + 13) % 26) + 97;             
      }             
      ac[i] = (char) j;             
      i++;         
      }         
     return String.valueOf(ac);     
    }

public String getSerial(String userId, String licenseNum)
    {         
     java.util.Calendar cal = java.util.Calendar.getInstance();         
     cal.add(1, 3);         
     cal.add(6, -1);         
     java.text.NumberFormat nf = new java.text.DecimalFormat("000"); 
     licenseNum = nf.format(Integer.valueOf(licenseNum));        
     String verTime = new StringBuilder("-").append(new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime())).append("0").toString();         
     String type = "YE3MP-";         
     String need = new StringBuilder(userId.substring(0, 1)).append(type).append("300").append(licenseNum).append(verTime).toString();         
     String dx = new StringBuilder(need).append(LL).append(userId).toString();         
     int suf = this.decode(dx);         
     String code = new StringBuilder(need).append(String.valueOf(suf)).toString();         
     return this.change(code);    
    }

public bbs()    
    {  
     super();      
    }

}