showchargeservlet.java

来自「开发的一个java web的任务管理系统。」· Java 代码 · 共 68 行

package unicom.action;

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 unicom.factory.ServiceFactory;
import unicom.service.IChargeService;
import unicom.service.IMobileService;

/**
 * @author xiaogang
 * 日期：Apr 18, 2008
 * 功能：更据charge.jsp页面动态选择列表框，动态从数据库中取出内容，并显示到页面上
 * 优点：
 * 缺点：
 * 建议：认真学习JavaScript脚本技术和ajax技术，将桌面系统的异步优势运用到Web应用上
 */
public class ShowChargeServlet extends HttpServlet {

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
        //防止中文乱码
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		//获取客户端的输出流
		PrintWriter out = response.getWriter();
		//获取请求数据
		String code = request.getParameter("code");
		IChargeService mobileService = ServiceFactory.createChargeService();
		double price = mobileService.getChargePriceByCode(code);
		//向客户端打印数据，另一方面在浏览器端利用xmlHttpRequest.responseText接收该数据
		out.println(price);

	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

      doGet(request,response);
	}

}