MyEclipse for Spring 8.5序列号算法

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class CalSn {
    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 type) {
        NumberFormat nf = new DecimalFormat("000");
        Calendar cal = Calendar.getInstance();
        cal.add(Calendar.YEAR, 3);
        cal.add(Calendar.DAY_OF_YEAR, -1);
        String licenseNum = nf.format((int) (Math.random() * 1000));
        String expTime = new StringBuilder("-")
                .append(new SimpleDateFormat("yyMMdd").format(cal.getTime()))
                .append("0").toString();
        String need = new StringBuilder(userId.substring(0, 1)).append("Y")
                .append(type).append("-100").append(licenseNum).append(expTime)
                .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 static void main(String[] args) {
        String userId = "qiang";
        CalSn myeclipsegen = new CalSn();
        String res = myeclipsegen.getSerial(userId, "E3MS");
        System.out.println("Serial:" + res);
    }
}

运行结果：

运行结果：
运行:D:\Java\jdk1.8.0\bin\java.exe CalSn
Serial:dLR8ZF-655880-6151685350542957
输出结束,返回值是[0].

所以序列号为：
qiang
dLR8ZF-655880-6151685350542957

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