helloworldservlet.java

Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容易而轻松。 Wicket利用一个POJO data beans组件使得它可以与任何持久层技术相结合。

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
package org.apache.wicket.examples;

import java.io.IOException;
import java.io.PrintWriter;

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

import org.apache.wicket.Session;
import org.apache.wicket.protocol.http.servlet.WicketSessionFilter;

/**
 * Simple servlet that if configured with {@link WicketSessionFilter} prints the current session.
 */
public class HelloWorldServlet extends HttpServlet
{
	/**
	 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
	 *      javax.servlet.http.HttpServletResponse)
	 */
	public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
			IOException
	{
		res.setContentType("text/html");
		PrintWriter out = res.getWriter();
		String message = "Hi. " +
				(Session.exists()
						? " I know Wicket session " + Session.get() + "."
						: " I can't find a Wicket session.");
		out.println(message);
		out.close();
	}

}