悟心

package com.sn;

import java.text.DecimalFormat;  

import java.text.NumberFormat;  
 
import java.text.SimpleDateFormat;  
 
import java.util.Calendar;  
 
 
 
public class Sn {  
 
 public static final void main(String[] args){
  String id="ABio";//注冊名 id
  String num="1";//填上授權(quán)數(shù)目 1-999
  System.out.println(getSerial(id,"100",num,false));
  }
  public static String getSerial(String userId, String version,
  String licenseNum, boolean selected) {
  Calendar cal = Calendar.getInstance();
  cal.add(1, 3);
  cal.add(6, -1);
  NumberFormat nf = new DecimalFormat("000");
  licenseNum = nf.format(Integer.valueOf(licenseNum));
  String verTime = selected ? (new StringBuffer("-")).append(
  (new SimpleDateFormat("yyMMdd")).format(cal.getTime())).append(
  "0").toString() : "-0912310"; //授權(quán)的截止日期09年12月31日
  String type = "YE3MB-";
  String need = (new StringBuffer(String.valueOf(userId.substring(0, 1))))
  .append(type).append(version).append(licenseNum)
  .append(verTime).toString();
  String dx = (new StringBuffer(String.valueOf(need)))
  .append(
  "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.")

  .append(userId).toString();
  int suf = decode(dx);
  String code = (new StringBuffer(String.valueOf(need))).append(
  String.valueOf(suf)).toString();
  return change(code);
  }

  private static int decode(String s) {
  int i = 0;
  char ac[] = s.toCharArray();
  int j = 0;
  for (int k = ac.length; j < k; j++)
  i = 31 * i + ac[j];

  return Math.abs(i);
  }
  private static String change(String s) {
  byte abyte0[] = s.getBytes();
  char ac[] = new char[s.length()];
  int i = 0;
  for (int k = abyte0.length; i < k; i++) {
  int 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;
  }

  return String.valueOf(ac);
  }

}