// ==================== Program Discription ==========================
// 程序名稱：示例20-1 : AuthenticationDemo1.java
// 程序目的：使用JAAS進行認證
// ==============================================================
public class AuthenticationDemo1
{
   public static void main(String[] args) {
      LoginContext lc = new LoginContext("Example");
      try {
         lc.login();
      } catch (LoginException) {
         // Authentication failed.
      }

      //If Authentication successed, we can use the returned Subject.
      Subject sub = lc.getSubject();
      Subject.doAs(sub, new MyPrivilegedAction());
   }
}