MyEcplise的注册代码

代码分析
  1 package test;
  2 
  3 import java.io.BufferedReader;
  4 
  5 import java.io.IOException;
  6 
  7 import java.io.InputStreamReader;
  8 
  9 public class FTL
 10 {
 11 
 12     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.";
 13 
 14     public String getSerial(String userId, String licenseNum)
 15     {
 16 
 17         java.util.Calendar cal = java.util.Calendar.getInstance();
 18 
 19         cal.add(1, 3);
 20 
 21         cal.add(6, -1);
 22 
 23         java.text.NumberFormat nf = new java.text.DecimalFormat("000");
 24 
 25         licenseNum = nf.format(Integer.valueOf(licenseNum));
 26 
 27         String verTime = new StringBuilder("-").append(
 28 
 29         new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime()))
 30 
 31         .append("0").toString();
 32 
 33         String type = "YE3MP-";
 34 
 35         String need = new StringBuilder(userId.substring(0, 1)).append(type)
 36 
 37         .append("300").append(licenseNum).append(verTime).toString();
 38 
 39         String dx = new StringBuilder(need).append(LL).append(userId)
 40 
 41         .toString();
 42 
 43         int suf = this.decode(dx);
 44 
 45         String code = new StringBuilder(need).append(String.valueOf(suf))
 46 
 47         .toString();
 48 
 49         return this.change(code);
 50 
 51     }
 52 
 53     private int decode(String s)
 54     {
 55 
 56         int i;
 57 
 58         char[] ac;
 59 
 60         int j;
 61 
 62         int k;
 63 
 64         i = 0;
 65 
 66         ac = s.toCharArray();
 67 
 68         j = 0;
 69 
 70         k = ac.length;
 71 
 72         while (j < k)
 73         {
 74 
 75             i = (31 * i) + ac[j];
 76 
 77             j++;
 78 
 79         }
 80 
 81         return Math.abs(i);
 82 
 83     }
 84 
 85     private String change(String s)
 86     {
 87 
 88         byte[] abyte0;
 89 
 90         char[] ac;
 91 
 92         int i;
 93 
 94         int k;
 95 
 96         int j;
 97 
 98         abyte0 = s.getBytes();
 99 
100         ac = new char[s.length()];
101 
102         i = 0;
103 
104         k = abyte0.length;
105 
106         while (i < k)
107         {
108 
109             j = abyte0[i];
110 
111             if ((j >= 48) && (j <= 57))
112             {
113 
114                 j = (((j - 48) + 5) % 10) + 48;
115 
116             } else if ((j >= 65) && (j <= 90))
117             {
118 
119                 j = (((j - 65) + 13) % 26) + 65;
120 
121             } else if ((j >= 97) && (j <= 122))
122             {
123 
124                 j = (((j - 97) + 13) % 26) + 97;
125 
126             }
127 
128             ac[i] = (char) j;
129 
130             i++;
131 
132         }
133 
134         return String.valueOf(ac);
135 
136     }
137 
138     public FTL()
139     {
140 
141         super();
142 
143     }
144 
145     public static void main(String[] args)
146     {
147 
148         try
149         {
150 
151             System.out.println("please input register name:");
152 
153             BufferedReader reader = new BufferedReader(new InputStreamReader(
154 
155             System.in));
156 
157             String userId = null;
158 
159             userId = reader.readLine();
160 
161             FTL myeclipsegen = new FTL();
162 
163             String res = myeclipsegen.getSerial(userId, "5");
164 
165             System.out.println("Serial:" + res);
166 
167             reader.readLine();
168 
169         } catch (IOException ex)
170         {
171 
172         }
173 
174     }
175 
176 }
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