myeclipse 注册码生成代码

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Myeclipse5_5_0_KeyMaker
{
private static final String L = "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)
{
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  String userId = null;
  int intLicenseNum = 1;
  String strLicenseNum = null;
  boolean bProFlag = true;
  String strProFlag = null;

  while ((userId == null) || ("".equals(userId.trim()))) {
  System.out.print("用户名: ");
  try {
  userId = br.readLine();
  }
  catch (IOException localIOException1)
  {
  }
  }
  System.out.print("注册码可用的用户数量(默认 1, 最大 999): ");
  try {
  strLicenseNum = br.readLine();
  }
  catch (IOException localIOException2)
  {
  }

  Object nf = new DecimalFormat("000");
  if ((strLicenseNum == null) || ("".equals(strLicenseNum.trim())))
  strLicenseNum = ((NumberFormat)nf).format(intLicenseNum);
  else {
  strLicenseNum = ((NumberFormat)nf).format(Integer.parseInt(strLicenseNum));
  }

  System.out.print("个人版 或 标准版(默认 个人版, n 标准版): ");
  try {
  strProFlag = br.readLine();
  }
  catch (IOException localIOException3) {
  }
  if ((strProFlag != null) && (!("".equals(strProFlag.trim())))) {
  bProFlag = false;
  }

  Calendar cal = Calendar.getInstance();
  cal.add(1, 2);
  cal.add(6, -1);
  SimpleDateFormat sdf = new SimpleDateFormat("yyMMdd");

  String need = userId.substring(0, 1) + "Y" +
  ((bProFlag) ? "E3MP" : "E2MY") + "-100" + strLicenseNum + "-" +
  sdf.format(cal.getTime()) + "0";
  String dx = need + "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." + userId;
  int suf = decode(dx);
  String code = need + suf;
  System.out.println("注册码: " + change(code));
}

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);
}

static String change(String s) {
  if ((s == null) || (s.length() == 0))
  return 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);
}
}