MyEclipse8.0 注册码生成代码

转自：http://blog.sina.com.cn/s/blog_7ad29e00010199xt.html

package com.guaicaicc.register;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class MyEclipseGen {
    public static final void main(String[] args) {
        String id = "hhhhhh"; // 可更给为您的名字
        String num = "111";// 许可证数量
        System.out.println(getSerial(id, "100", num, false));
    }

    public static String getSerial(String userId, String version, String licenseNum, boolean selected) {
        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 = selected ? (new StringBuffer("-")).append((new SimpleDateFormat("yyMMdd")).format(cal.getTime()))
                .append("0").toString() : "-1512310";// 表示20101231，可改为自己需要的日期
        String type = "YE3MB-";
        String need = (new StringBuffer(String.valueOf(userId.substring(0, 1)))).append(type).append(version).append(licenseNum)
                .append(verTime).toString();
        String dx = (new StringBuffer(String.valueOf(need)))
                .append(
                        "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.")
                .append(userId).toString();
        int suf = decode(dx);
        String code = (new StringBuffer(String.valueOf(need))).append(String.valueOf(suf)).toString();
        return change(code);
    }

    private static int decode(String s) {
        int i = 0;
        char ac[] = s.toCharArray();
        int j = 0;
        for (int k = ac.length; j < k; j++)
            i = 31 * i + ac[j];
        return Math.abs(i);
    }

    private static String change(String s) {
        byte abyte0[] = s.getBytes();
        char ac[] = new char[s.length()];
        int i = 0;
        for (int k = abyte0.length; i < k; i++) {
            int 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;
        }
        return String.valueOf(ac);
    }
}