MyEclipse_6.5.1GA_E3.3.2_Installer_注册算法

package com.jadyer.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;

/**
 * MyEclipse_6.5.1GA_E3.3.2_Installer_注册算法
 * @create Oct 23, 2012 9:48:29 AM
 * @author 玄玉<http://blog.csdn/net/jadyer>
 */
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) {
		Calendar cal = Calendar.getInstance();
		cal.add(1, 3);
		cal.add(6, -1);
		NumberFormat nf = new DecimalFormat("000");
		licenseNum = nf.format(Integer.valueOf(licenseNum));
		String verTime = new StringBuilder("-").append(new 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) throws IOException {
		System.out.println("Please Input Register Name:");
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String serialNo = new MyEclipseGen().getSerial(br.readLine(), "1");
		br.close();
		System.out.println("Your SerialNo Is:[" + serialNo + "]");
	}
}