myEclipse注册码的获取

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
/****
 * 
 * @author Administrator
 * @des 注册机
 *
 */
public class RegisterEclipse {
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 RegisterEclipse() {
super();
}



public static void main(String[] args) throws IOException{
System.out.println("please input register name:");   
  BufferedReader reader = new BufferedReader(new InputStreamReader(   
     System.in));   
   String userId = null;   
   userId = reader.readLine();   
   RegisterEclipse myeclipsegen = new RegisterEclipse();   
   String res = myeclipsegen.getSerial(userId, "5");   
   System.out.println("Serial:" + res);   
   reader.readLine();   
   //niubi
   //aLR8ZC-855550-64527556772244962

}


}
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