import java.text.DecimalFormat;

 import java.text.NumberFormat;

 import java.text.SimpleDateFormat;

 import java.util.Calendar;

 public class MyEclipseKeyGen {

     public static final void main(String[] args){

         String subscriber = "yuxinwangjing";  //subscriber

         String licenseNum = "500";  //Number of Licenses

         String version = "100"; //版本号

         String subscriptionCode = getSubscriptionCode(subscriber, version , licenseNum ,true);

         System.out.println(subscriptionCode);

     }

     public static String getSubscriptionCode(String subscriber, String version, String licenseNum, boolean selected) {

         Calendar cal = Calendar.getInstance();

         cal.add(1, 3);  //年份加三年

         cal.add(6, -1);  //日期减一,当前日期20141226，到期日期则为20171225

         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() : "-0812310";

         String type = "YE3MB-";

         String need = (new StringBuffer(String.valueOf(subscriber.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 im*ment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.").append(subscriber).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);

     }

 }