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新建一个类：MyEclispeGen后，点击run as 运行，然后输入用户名*****，回车就可以出现注册码啦，我试过了可以用。

代码如下：

package myeclipse;

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.";  
     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);  
             reader.readLine();  
         } catch (IOException ex) {  
         }  
     }  
 }