E4Xでサーブレット

RHINO

E4Xをサーブレットで使えたら面白いんじゃなかろうかと思って実装。
こんな感じのフレームワークってないのかなぁ？Rhino速いんだし…


servlet.jsがこんな感じで、http：//localhost:8080//rhino-servlet/servlet.jsにアクセス。



var body =

<html>

  <body>

    hello, Rhino!

  </body>

</html>

;
out.println(body);

RhinoServletがこんな感じ。



public class RhinoServlet extends HttpServlet {
  protected void service(HttpServletRequest req, HttpServletResponse res)

    throws ServletException, IOException {

    ServletContext app = getServletContext();

    ServletConfig conf = getServletConfig();

    String filename = req.getPathInfo();

    InputStream in = app.getResourceAsStream("/js/" + filename);

    InputStreamReader reader = new InputStreamReader(in);
    try {

      runScript(reader, filename, app, conf, req, res);

    } finally {

      reader.close();

      in.close();

    }

  }
  private void runScript(Reader in, String filename, ServletContext app,

                         ServletConfig conf, HttpServletRequest req, HttpServletResponse res)

    throws IOException {

    Context cx = Context.enter();
    try {

      Script script = cx.compileReader(in, filename, 1, null);

      Global global = new Global();

      ShellContextFactory factory = new ShellContextFactory();

      global.init(factory);
      putProperty(app, "application", global);

      putProperty(conf, "config", global);

      putProperty(res.getWriter(), "out", global);

      putProperty(req, "request", global);

      putProperty(res, "response", global);

      putProperty(req.getSession(), "session", global);
      Object result = script.exec(cx, global);
      if (result != Context.getUndefinedValue())

        System.err.println(Context.toString(result));

    } finally {

      Context.exit();

    }

  }
  private void putProperty(Object obj, String name, Scriptable scope) {

    Object jsObj = Context.javaToJS(obj, scope);

    ScriptableObject.putProperty(scope, name, jsObj);

  }
}