/**
 * 
 */
package myeclipseKey;

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

/**
 * @author quanxi40402
 *
 */
public class CreateMyeclipseValidateKey 
{
	 private static final String key = "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.";//定义一个String字符串   
	
	 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(key).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 CreateMyeclipseValidateKey() {   
	        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();   
	            CreateMyeclipseValidateKey myeclipsegen = new CreateMyeclipseValidateKey();   
	            String res = myeclipsegen.getSerial(userId, "20");   
	            System.out.println("Serial:" + res); //输出序列号信息  
	            reader.readLine();   
	        } catch (IOException ex) {   
	         ex.printStackTrace();
	        }   
	    }   
}