MyEclipse注册码生成

 1 package com;
 2 import java.io.*; 
 3     public class MyEclipseGen { 
 4         private static final String LL = "Decompiling this copyrighted software is a violation of both " +
 5                 "your license agreement and the Digital Millenium Copyright Act of 1998 " +
 6                 "(http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA," +
 7                 " penalties range up to a $500,000 fine or up to five years imprisonment for a first offense." +
 8                 " Think about it; pay for a license, avoid prosecution, and feel better about yourself."; 
 9         public String getSerial(String userId, String licenseNum) { 
10             java.util.Calendar cal = java.util.Calendar.getInstance(); 
11             cal.add(1, 3); 
12             cal.add(6, -1); 
13             java.text.NumberFormat nf = new java.text.DecimalFormat("000"); 
14             licenseNum = nf.format(Integer.valueOf(licenseNum)); 
15             String verTime = new StringBuilder("-").append(new java.text. 
16                     SimpleDateFormat("yyMMdd").format(cal.getTime())).append("0"). 
17                              toString(); 
18             String type = "YE3MP-"; 
19             String need = new StringBuilder(userId.substring(0, 1)).append(type). 
20                           append("300").append(licenseNum).append(verTime).toString(); 
21             String dx = new StringBuilder(need).append(LL).append(userId).toString(); 
22             int suf = this.decode(dx); 
23             String code = new StringBuilder(need).append(String.valueOf(suf)). 
24                           toString(); 
25             return this.change(code); 
26         } 
27 
28         private int decode(String s) { 
29             int i; 
30             char[] ac; 
31             int j; 
32             int k; 
33             i = 0; 
34             ac = s.toCharArray(); 
35             j = 0; 
36             k = ac.length; 
37             while (j < k) { 
38                 i = (31 * i) + ac[j]; 
39                 j++; 
40             } 
41             return Math.abs(i); 
42         } 
43 
44         private String change(String s) { 
45             byte[] abyte0; 
46             char[] ac; 
47             int i; 
48             int k; 
49             int j; 
50             abyte0 = s.getBytes(); 
51             ac = new char[s.length()]; 
52             i = 0; 
53             k = abyte0.length; 
54             while (i < k) { 
55                 j = abyte0[i]; 
56                 if ((j >= 48) && (j <= 57)) { 
57                     j = (((j - 48) + 5) % 10) + 48; 
58                 } else if ((j >= 65) && (j <= 90)) { 
59                     j = (((j - 65) + 13) % 26) + 65; 
60                 } else if ((j >= 97) && (j <= 122)) { 
61                     j = (((j - 97) + 13) % 26) + 97; 
62                 } 
63                 ac[i] = (char) j; 
64                 i++; 
65             } 
66             return String.valueOf(ac); 
67         } 
68 
69         public MyEclipseGen() { 
70             super(); 
71         } 
72 
73         public static void main(String[] args) { 
74             try { 
75                 System.out.println("please input register name:"); 
76                 BufferedReader reader = new BufferedReader(new InputStreamReader( 
77                         System.in)); 
78                 String userId = null; 
79                 userId = reader.readLine(); 
80                 MyEclipseGen myeclipsegen = new MyEclipseGen(); 
81                 String res = myeclipsegen.getSerial(userId, "20"); 
82                 System.out.println("Serial:" + res); 
83                 reader.readLine(); 
84             } catch (IOException ex) { 
85             } 
86         } 
87     }