java编写myEclipse注册码

package test.xml;import java.util.Scanner;public class MyEclipse {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 MyEclipse() {}public String getSerial(String subscriber, String licenseNum) {java.util.Calendar cal = java.util.Calendar.getInstance();// 获得当前日期cal.add(1, 3);// +3年cal.add(6, -1);// 当前日-1java.text.NumberFormat nf = new java.text.DecimalFormat("000");licenseNum = nf.format(Integer.valueOf(licenseNum));// licenseNum格式化成三位数字String verTime = new StringBuilder("-").append(new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime())).append("0").toString();// 日期String type = "YE3MP-";String need = new StringBuilder(subscriber.substring(0, 1)).append(type).append("300").append(licenseNum).append(verTime).toString();// 初步注册信息String dx = new StringBuilder(need).append(LL).append(subscriber).toString();int suf = this.decode(dx);// 编码初步注册信息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();// 把s转化为单个字符数组j = 0;k = ac.length;while (j < k) {i = (31 * i) + ac[j];// 加密算法，不理解为什么这样子？有可能就是这样子定义的j++;}return Math.abs(i);// 取绝对值}private String change(String s) {byte[] abyte0;char[] ac = null;int i;int k;int j;abyte0 = s.getBytes();ac = new char[abyte0.length];i = 0;k = abyte0.length;while (i < k) {j = abyte0[i];if ((j >= 48) && (j <= 57))// 0-9,实现01234和56789相应的相互对调，也即0与5对调，1与6对调{j = (((j - 48) + 5) % 10) + 48;} else if ((j >= 65) && (j <= 90))// A-Z{j = (((j - 65) + 13) % 26) + 65;} else if ((j >= 97) && (j <= 122))// a-z{j = (((j - 97) + 13) % 26) + 97;}ac[i] = (char) j;i++;}return String.valueOf(ac);}public static void main(String[] args) {// 输入中文会出现一些中文乱码问题// 输入中文，一个是由于工程设置的字符集有可能会出现乱码，第二个是后面的getBytes对不同的字符会出现不同的处理形式而导致的中文乱码// 所以大家也就没有办法设置中文用户名了，如果有高手解决了，请通知我（QQ：506817493，E：[e-mail]），谢谢System.out.print("请输入注册的用户名(不支持中文):");Scanner scanner = new Scanner(System.in);// 输入流String subscriber = scanner.nextLine();// 读下一行字符串MyEclipse myeclipseKeyGen = new MyEclipse();// 实例化String subscription_Code = myeclipseKeyGen.getSerial(subscriber, "1");// 后面的参数是一个数字类型的字符串,数字范围为0-999System.out.println("\n" + "MyEclipse注册码生成的结果如下" + "\n");System.out.println("Subscriber:" + subscriber);System.out.println("Subscription Code:" + subscription_Code);}}