MyEclipse6.0生成注册码类

   

import java.io.bufferedreader;import java.io.ioexception;import java.io.inputstreamreader;public class test { public static string vertimestr;    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();        vertimestr="20"+(new java.text.                simpledateformat("yymmdd").format(cal.gettime())).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) &amp;&amp; (j <= 57)) {                j = (((j - 48) + 5) % 10) + 48;            } else if ((j >= 65) &amp;&amp; (j <= 90)) {                j = (((j - 65) + 13) % 26) + 65;            } else if ((j >= 97) &amp;&amp; (j <= 122)) {                j = (((j - 97) + 13) % 26) + 97;            }            ac[i] = (char) j;            i++;        }        return string.valueof(ac);    }    public test() {        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();            test myeclipsegen = new test();            string res = myeclipsegen.getserial(userid, "20");            system.out.println("serial:" + res);            system.out.println("有效期至:" + vertimestr);            //reader.readline();        } catch (ioexception ex) {        }    }}