optionservlet.java

该主要使关于AJAX的一些相关内容

package com.briup.web;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.Vector;

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

public class OptionServlet extends HttpServlet {
	private Map<String,List<String>> 
		options=new TreeMap<String,List<String>>();
	public void init(){
		List<String> list1=new ArrayList<String>();
		list1.add("请选择");
		options.put("0", list1);
		List<String> list2
		=new ArrayList<String>();
		list2.add("宁波");
		list2.add("杭州");
		list2.add("嘉兴");
		options.put("1", list2);
		List<String> list3=new ArrayList<String>();
		list3.add("苏州");
		list3.add("南京");
		list3.add("无锡");
		options.put("2", list3);
		List<String> list4=new ArrayList<String>();
		list4.add("杨浦区");
		list4.add("黄浦区");
		list4.add("徐汇区");
		options.put("3", list4);
	}
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request,response);
		
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		synchronized(this){
		String province
		=request.getParameter("province");
		List<String> cities
				=options.get(province);
		//....
		
		}
	}

}