MyEclipseGen

1.  import java.io.*;  
    public class MyEclipseGen {  
       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.";//定义一个String字符串  
       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();  
           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 MyEclipseGen() {  
           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();  
               MyEclipseGen myeclipsegen = new MyEclipseGen();  
               String res = myeclipsegen.getSerial(userId, "20");  
               System.out.println("Serial:" + res); //输出序列号信息 
               reader.readLine();  
           } catch (IOException ex) {  
           
           }  
       }  
   }