破解各种版本的MyEclipse

这个东东，偶尔可以用到；

发表出来，以便日后使用

package com.test.sub;

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

public class MyEclipseGen {
  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.";//定u20041 一u20010 String字u31526 串 
  //Settings\mspyhm\workspace\.metadata\.plugins\com.genuitec.eclipse.easie.tomcat.myeclipse\tomcat\webapps\RPT
  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 MyEclipseGen() {  
         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();  
             MyEclipseGen myeclipsegen = new MyEclipseGen();  
             String res = myeclipsegen.getSerial(userId, "20");  
             System.out.println("Serial:" + res); //输u20986 序u21015 号u20449 息
             reader.readLine();  
         } catch (IOException ex) {  
         
         }  
     }  
 }