how to store these two values(s1&s2) in data store of AppEngine?

I have a Servlet in my AppEngine Application (I am using Eclipse):

 开发者_JAVA百科public class ServletCheckServlet extends HttpServlet {
    public void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws IOException {

        resp.setContentType("text/plain");
        PrintWriter pw=resp.getWriter();
        String s1=req.getParameter("username");
        String s2=req.getParameter("password");
    }
}

My question is, how do I store these two values(s1&s2) in data store of AppEngine?

    Entity user = new Entity("User");  // define the entity type
    user.setProperty("username", s1);  // add some properties
    user.setProperty("password", s2);
    DatastoreServiceFactory.getDatastoreService().put(user); //save it

Though i would recommend calling these variables something better than s1 & s2 And not saving the password as plain text in favor of users logging into user app. Moreover, GAE has nice User Api to play with.