用法，非常简单，新建个类，复制代码进去，改掉编译错误，run as java app... 然后随便输入一个用户名，回车，下面一行显示的就是激活码，当然，记住你写进去的用户名和输出的激活码，OK，放心去激活吧，亲测可用。！
package day02;
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)
{
}
}
}