myeclipse注册码生成器

记录一个备用：

import java.io.*;   
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.";     


    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);     
                           reader.readLine();     
                      } catch (IOException ex) {     
                      }     
                }

}