MyEclipse Bule 6.5的注册码生成器 java版

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="juny"; 
        String num="999"; 
        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"; //这里改过期日期
        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); 
    } 
}