1. import java.io.BufferedReader;
   
2. import java.io.IOException;
   
3. import java.io.InputStreamReader;
   
4. import java.text.DecimalFormat;
   
5. import java.text.NumberFormat;
   
6. import java.text.SimpleDateFormat;
   
7. import java.util.Calendar;
   
8. 
   
9. 
   
10. public class MyEclipseKeyGen {
    
11. 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.";
    
12. 
    
13. 
    
14. public String getSerial(String userId, String type) {
    
15. NumberFormat nf = new DecimalFormat("000");
    
16. Calendar cal = Calendar.getInstance();
    
17. cal.add(Calendar.YEAR, 3);
    
18. cal.add(Calendar.DAY_OF_YEAR, -1);
    
19. String licenseNum = nf.format((int) (Math.random() * 1000));
    
20. String expTime = new StringBuilder("-").append(
    
21. new SimpleDateFormat("yyMMdd").format(cal.getTime())).append(
    
22. "0").toString();
    
23. String need = new StringBuilder(userId.substring(0, 1)).append("Y")
    
24. .append(type).append("-100").append(licenseNum).append(expTime)
    
25. .toString();
    
26. String dx = new StringBuilder(need).append(LL).append(userId)
    
27. .toString();
    
28. int suf = this.decode(dx);
    
29. String code = new StringBuilder(need).append(String.valueOf(suf))
    
30. .toString();
    
31. return this.change(code);
    
32. }
    
33. 
    
34. 
    
35. private int decode(String s) {
    
36. int i;
    
37. char[] ac;
    
38. int j;
    
39. int k;
    
40. i = 0;
    
41. ac = s.toCharArray();
    
42. j = 0;
    
43. k = ac.length;
    
44. while (j < k) {
    
45. i = (31 * i) + ac[j];
    
46. j++;
    
47. }
    
48. return Math.abs(i);
    
49. }
    
50. 
    
51. 
    
52. private String change(String s) {
    
53. byte[] abyte0;
    
54. char[] ac;
    
55. int i;
    
56. int k;
    
57. int j;
    
58. abyte0 = s.getBytes();
    
59. ac = new char[s.length()];
    
60. i = 0;
    
61. k = abyte0.length;
    
62. while (i < k) {
    
63. j = abyte0[i];
    
64. if ((j >= 48) && (j <= 57)) {
    
65. j = (((j - 48) + 5) % 10) + 48;
    
66. } else if ((j >= 65) && (j <= 90)) {
    
67. j = (((j - 65) + 13) % 26) + 65;
    
68. } else if ((j >= 97) && (j <= 122)) {
    
69. j = (((j - 97) + 13) % 26) + 97;
    
70. }
    
71. ac[i] = (char) j;
    
72. i++;
    
73. }
    
74. return String.valueOf(ac);
    
75. }
    
76. 
    
77. 
    
78. public static void main(String[] args) {
    
79. try {
    
80. System.out.println("please input register name:");
    
81. BufferedReader reader = new BufferedReader(new InputStreamReader(
    
82. System.in));
    
83. String userId = null;
    
84. userId = reader.readLine();
    
85. if(userId == null || "".equals(userId)){
    
86. System.out.println("name is null");
    
87. System.exit(0);
    
88. }
    
89. MyEclipseKeyGen myeclipsegen = new MyEclipseKeyGen();
    
90. String res = myeclipsegen.getSerial(userId, "E3MS");
    
91. System.out.println("Serial:" + res);
    
92. reader.readLine();
    
93. } catch (IOException ex) {
    
94. ex.printStackTrace();
    
95. }
    
96. }
    
97. }

复制代码

输入名字即可：
name:lizhen
key:yLR8ZF-655332-6059545238330702
MyEclipse注册码

  网上找的一段注册机代码，分享给大家，不好意思，不是我写的额。

高手 。！！

膜拜，高手啊，请问注册机什么原理。。 简单描述下