selectcityservlet.java

AJAX源码,适合初学者上手,一共有3个源码,循序渐进的学习AJAX,这是3

package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

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

import dao.AjaxDAO;
import dto.AjaxDTO;

public class SelectCityServlet extends HttpServlet {

	protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1)
			throws ServletException, IOException {
		Process(arg0, arg1);
	}

	protected void doPost(HttpServletRequest arg0, HttpServletResponse arg1)
			throws ServletException, IOException {
		Process(arg0, arg1);
	}

	protected void Process(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/xml;charset=utf-8");
		response.setHeader("Cache-Control", "no-cache");
		String country = request.getParameter("country");

		int id = Integer.parseInt(country);
		AjaxDAO dao = new AjaxDAO();
		List list = dao.FindByCountryId(id);
		Iterator itr = list.iterator();
		String cityName = null;
		StringBuffer sb = new StringBuffer("<country>");
		while (itr.hasNext()) {
			AjaxDTO dto = (AjaxDTO) itr.next();
			cityName = dto.getCity();
			if (dto != null) {
				sb.append("<city>").append(cityName).append("</city>");
			}
		}

		sb.append("</country>");

		PrintWriter out = response.getWriter();
		out.write(sb.toString());
		out.close();

	}
}