爱华网本文是转自其它博文，用以留着备份的~
Step：
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"pleaseinput registername:"，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SubscriptionCode中输入第3步生成的序列号
Code：
importjava.io.BufferedReader;importjava.io.IOException;importjava.io.InputStreamReader;publicclass MyEclipseGen {privatestatic final String LL ="Decompiling this copyrighted software is a violation of bothyour license agreement and the Digital Millenium Copyright Act of1998 (http://www.loc.gov/copyright/legislation/dmca.pdf).Under section 1204 of the DMCA, penalties range up to a $500,000fine or up to five years imprisonment for a first offense. Thinkabout it; pay for a license, avoid prosecution, and feel betterabout yourself.";public StringgetSerial(String userId, String licenseNum) {java.util.Calendarcal = java.util.Calendar.getInstance();cal.add(1,3);cal.add(6,-1);java.text.NumberFormatnf = newjava.text.DecimalFormat("000");licenseNum= nf.format(Integer.valueOf(licenseNum));StringverTime = newStringBuilder("-").append(newjava.text.SimpleDateFormat("yyMMdd").format(cal.getTime())).append("0").toString();Stringtype = "YE3MP-";Stringneed = newStringBuilder(userId.substring(0,1)).append(type).append("300").append(licenseNum).append(verTime).toString();Stringdx = newStringBuilder(need).append(LL).append(userId).toString();intsuf =this.decode(dx);Stringcode = newStringBuilder(need).append(String.valueOf(suf)).toString();returnthis.change(code);}privateint decode(String s) {inti;char[]ac;intj;intk;i= 0;ac= s.toCharArray();j= 0;k= ac.length;while(j < k) {i= (31 * i) + ac[j];j++;}returnMath.abs(i);}privateString change(String s) {byte[]abyte0;char[]ac;inti;intk;intj;abyte0= s.getBytes();ac= newchar[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++;}returnString.valueOf(ac);}publicMyEclipseGen() {super();}publicstatic void main(String[] args){try{System.out.println("pleaseinput register name:");BufferedReaderreader = newBufferedReader(newInputStreamReader(System.in));StringuserId = null;userId= reader.readLine();MyEclipseGenmyeclipsegen = newMyEclipseGen();Stringres = myeclipsegen.getSerial(userId,"5");System.out.println("Serial:"+ res);reader.readLine();}catch (IOException ex) {}}} 
