最近学Spring，跟着《Spring 3.x企业实用开发实战》来，所有还是按照该书提供的myeclipse和spring版本来吧。
转自http://blog.sina.com.cn/s/blog_70600f7201018pib.html，致谢！
步骤：
1、建立一个任意名称的Java Project 2、在该工程中建立一个名文MyEclipseGen的Java文件(MyEclipseGen.java) 3、运行下面的代码，会在控制台出现" please input register name:"，输入任意一个名字，回车后生成序列号 4、点击 MyEclipse菜单中Window→Preferences→MyEclipse→Subscription ，在右侧点击“Enter Subscription” 5、在弹出框中Subscriber中输入第3步的名字，在Subscription Code中输入第3步生成的序列号 Code： import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; 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, "5"); System.out.println("Serial:" + res); reader.readLine(); } catch (IOException ex) { } } }