country.java

网上购物系统

package tarena.servlet;

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

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

import tarena.dao.CountryareaDAO;
import tarena.entity.Countryarea;
import tarena.global.Transform;

@SuppressWarnings("serial")
public class Country extends HttpServlet {

	
	public void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/xml;");
		response.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();
		
		CountryareaDAO dao = new CountryareaDAO();
		
		
		//获取请求参数
		Integer parentid = Transform.getParentId(request.getParameter("parentid"));
		Integer level = Transform.getParentId(request.getParameter("level"));
		
		Integer countryid=(level.equals(1)?parentid:1);
		Integer provinceid=(level.equals(2)?parentid:dao.getDefaultId(countryid));
		Integer areaid=(level.equals(3)?parentid:dao.getDefaultId(provinceid));		
		//得到各级省份地区县市的集合
		List<Countryarea> places = new LinkedList<Countryarea>();		
		
		
		switch(level){
		case 1: //如果选择的是国家，则省份、地区、县市均改变
			places.addAll(dao.findByExample(new Countryarea(countryid,2)));			//得到省的信息	
		case 2: //如果选择的是省，则地区、县市均改变	
			places.addAll(dao.findByExample(new Countryarea(provinceid,3)));   	    //得到地区的信息	
		case 3: //如果选择的是地区，则县市改变
			places.addAll(dao.findByExample(new Countryarea(areaid,4)));     	    //得到县市的信息
		}
		
		StringBuffer re = new StringBuffer();		
		re.append("<country-area>");
		//添加信息		
		for(Countryarea ca:places){
			re.append("<place id=\""+ca.getId()+"\" name=\""+ca.getAreaname()+"\" level=\""+ca.getLevel()+"\"/>");
		}			
		re.append("</country-area>");
		out.print(re);		
		out.flush();
		out.close();
	}

}