【转载】MyEclipse6.5 KeyGen

输入自己的注册名，生成注册码，完成注册

 package keyGenerate;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;   

 public class KeyGeneratetest {
 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 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);
 }   

 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 KeyGeneratetest() {
  super();
 }   

 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();
     KeyGeneratetest myeclipsegen = new KeyGeneratetest();
     String res = myeclipsegen.getSerial(userId, "5");
     System.out.println("Serial:" + res);
     reader.readLine();
   } catch (IOException ex) {
   }
 }
 }