formupdateservlet.java

来自「这是AJAX的一个HTML实现！ HTML标签AJAX的实现！」· Java 代码 · 共 56 行

/**
 * Copyright 2005 Darren L. Spurgeon
 * 
 * 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.
 */
package net.sourceforge.ajaxtags.demo.servlet;

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

import net.sourceforge.ajaxtags.servlets.BaseAjaxServlet;
import net.sourceforge.ajaxtags.xml.AjaxXmlBuilder;

/**
 * An example servlet that responds to an ajax:updateField tag action. This
 * servlet would be referenced by the baseUrl attribute of the JSP tag.
 * 
 * @author Darren L. Spurgeon
 * @version $Revision: 28 $ $Date$
 */
public class FormUpdateServlet extends BaseAjaxServlet {

    private static final double MPH_TO_KPH = 1.609344;

    private static final double MPH_TO_MPS = 0.44704;

    /**
     * @see BaseAjaxServlet#getXmlContent(javax.servlet.http.HttpServletRequest,
     *      javax.servlet.http.HttpServletResponse)
     */
    public String getXmlContent(HttpServletRequest request,
	    HttpServletResponse response) {
	double mph = 0, kph = 0, mps = 0;
	try {
	    mph = Double.parseDouble(request.getParameter("mph"));
	} catch (Exception e) {
	}
	kph = mph * FormUpdateServlet.MPH_TO_KPH;
	mps = mph * FormUpdateServlet.MPH_TO_MPS;

	return new AjaxXmlBuilder().addItem("kph", Double.toString(kph))
		.addItem("mps", Double.toString(mps)).toString();
    }

}