myeclipse注册码

package yu;
import java.io.*;
public class MyEclipseGen {//myeclipse注册码生成器//运行之后输入di就可以产生注册码  //myeclipse->Subscription Information->之后输入di及相关serial码了

 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, "0");      
	  
	                          System.out.println("Serial:" + res);      
	  
	                          reader.readLine();      
	  
	                      } catch (IOException ex) {      
	                           ex.printStackTrace();
	                      }      
	  

	                  }
	                  
}