source: branches/streams/abcl/examples/google-app-engine/src/abcl_ae/HelloWorldServlet.java

package abcl_ae;

import java.io.IOException;
import javax.servlet.http.*;
import javax.servlet.*;

import org.armedbear.lisp.Interpreter;
import org.armedbear.lisp.LispThread;
import org.armedbear.lisp.Lisp;
import org.armedbear.lisp.Symbol;
import org.armedbear.lisp.SpecialBinding;
import org.armedbear.lisp.SpecialBindingsMark;
import org.armedbear.lisp.Load;
import org.armedbear.lisp.Stream;

public class HelloWorldServlet extends HttpServlet {

  static private Symbol doGet = null;

  public void init() throws ServletException {
    AbclInit.init();
    doGet = Lisp.internInPackage("DO-GET", "FIRST-SERVLET");
  }


  public void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws IOException {

    LispThread currentThread = LispThread.currentThread();

    SpecialBindingsMark mark = currentThread.markSpecialBindings();
    currentThread.bindSpecial(
      Symbol.STANDARD_OUTPUT, 
      new Stream(Symbol.SYSTEM_STREAM, resp.getOutputStream(), 
                                   Symbol.CHARACTER, false));

    try {
      currentThread.execute(doGet);
    } finally {
      currentThread.resetSpecialBindings(mark);
    }
  }
}