myeclipse 注册码自动生成

在myeclipse中新建一个java 项目，创建一个MyEclipseGen类，内容如下，运行后按提示输入，就可以产生了。

忘了从哪里看到的了，这里记一下，以后找起来方便。

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) {    

                       }    

                 }    

              }