buffalopageservlet.java

AJAX的一个好东西哦,国人的一个AJAX的实现不错的东西

/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * $Id: BuffaloPageServlet.java 43 2005-12-12 01:24:50Z michael $
 */ 
package net.buffalo.server;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.buffalo.view.ViewRenderer;

/**
 * 
 * @author michael
 * @deprecated
 */
public class BuffaloPageServlet extends HttpServlet{

	private static final long serialVersionUID = -8317576767673043267L;
	
	private ServletConfig config;
	
	public void init(ServletConfig arg0) throws ServletException {
		
		super.init(arg0);
		
		this.config = arg0;
	}
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		String pathInfo = request.getPathInfo();
		
		if (pathInfo == null || pathInfo.equals("/")) {
			
			String layout = request.getParameter("_bpl");
			String requestLayout = "";
			if (layout == null || layout.trim().equals("")) {
				requestLayout = "default";
			} else {
				requestLayout = layout;
			}
			
			request.getRequestDispatcher("/WEB-INF/view/_layout/"+requestLayout+".jsp")
				.forward(request, response);
			return ;
		}
		
		String service = pathInfo.split("/")[1];
		
		if (service.equals("view")) {
			String specialHeader = request.getHeader("x-requested-with");
			if (specialHeader == null || !specialHeader.equals("XMLHttpRequest")) {
				/// direct visit
				String script = "<script language='javascript'>switchPage('home')</script>";
				request.setAttribute(BuffaloPageServlet.class.getName()+".INSERTION", script);
				
				System.out.println("direct visiting");
				
				request.getRequestDispatcher("/WEB-INF/view/_layout/default.jsp")
				.forward(request, response);

			} else {
				System.out.println("xmlhttp visiting");
				// use xmlhttp visit
				ViewRenderer render = new ViewRenderer();
				render.render(request, response);
			}
			
			return ;
		}
		
		Enumeration enumer = request.getHeaderNames();
		while(enumer.hasMoreElements()) {
			System.out.println(enumer.nextElement()+"\n");
		}
		
		ViewRenderer render = new ViewRenderer();
		render.render(request, response);
		
	}

}