jquery模拟股票信息实时显示

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;

/**
 * 返回股票当前信息的servlet
 */
public class GetStocksInfo extends HttpServlet{
    //保存股票对象的map
    private HashMap<String,Stock> stocks;
    public void init() throws ServletException {
        stocks = new HashMap<String,Stock>();
        //创建股票
        Stock szzs = new Stock(3000.0,2990.1,"上证指数","300001");
        Stock pufy = new Stock(23.22,23.50,"浦发银行","000001");

        //将两只股票保存到stocks的map中
        stocks.put(szzs.getId(),szzs);
        stocks.put(pufy.getId(),pufy);

        System.out.println(stocks);
        
    }

    protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
        //返回两只股票的价格信息

        //1 计算随机数
        double sz = Math.random() * 20;
        double pf = Math.random() * 0.5;

        //通过随机数是奇偶，判断股票涨跌
        boolean flagsz = ((int)(Math.random()*10))/2 == 0;
        boolean flagpf = ((int)(Math.random()*10))/2 == 0;


        //2 将随机数和股票的当前价格进行加或减的操作，得到新的当前价格
        Stock szzs = stocks.get("300001");
        Stock pfyh = stocks.get("000001");
        double temp;
        if(flagsz){
            temp = szzs.getNow()+sz;
        }else{
            temp = szzs.getNow()-sz;
        }
        //需要对新的当前价格截取，只保留小数点后两位
        temp = (int)(temp*100)/100.0;
        szzs.setNow(temp);
        if(flagpf){
            temp = pfyh.getNow()+pf;
        }else{
            temp = pfyh.getNow()-pf;
        }
        temp = (int)(temp*100)/100.0;
        pfyh.setNow(temp);

        httpServletResponse.setContentType("text/html;charset=gb2312");
        PrintWriter out = httpServletResponse.getWriter();
        //out.println(szzs + "<br/>" + pfyh);
        //3 返回两只股票的昨天收盘，今天开盘和当前价格
        //采用json的数据格式返货股票的信息
        StringBuilder builder = new StringBuilder();
        //采用数组的方式回传两个股票的信息
        /*
        builder.append("[{name:\"").append(szzs.getName()).append("\",id:\"").append(szzs.getId())
                .append("\",yes:").append(szzs.getYesterday()).append(",tod:").append(szzs.getToday())
                .append(",now:").append(szzs.getNow())
                .append("},")
                .append("{name:\"").append(pfyh.getName()).append("\",id:\"").append(pfyh.getId())
                .append("\",yes:").append(pfyh.getYesterday()).append(",tod:").append(pfyh.getToday())
                .append(",now:").append(pfyh.getNow())
                .append("}]");
        */
        //采用对象的方式回传两个股票对象
        //如果回传表示对象的json，需要在最外层加上括号，否则页面解析出错
        //如果将out.println 改为out.print 不让其在服务端输出/r/n也可
        builder.append("({\"")
                .append(szzs.getId()).append("\":{name:\"").append(szzs.getName()).append("\",yes:")
                .append(szzs.getYesterday()).append(",tod:")
                .append(szzs.getToday()).append(",now:").append(szzs.getNow())
                .append("},\"").append(pfyh.getId()).append("\":{name:\"").append(pfyh.getName()).append("\",yes:")
                .append(pfyh.getYesterday()).append(",tod:")
                .append(pfyh.getToday()).append(",now:").append(pfyh.getNow())
                .append("}")
                .append("})");
        out.println(builder);
        
    }

    protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
        doGet(httpServletRequest, httpServletResponse);
    }
}

/**
 * 用于保存股票的基本信息
 */
public class Stock {
    /**
     * 昨天的收盘价
     */
    private double yesterday;
    /**
     * 今天的开盘价
     */
    private double today;
    /**
     * 当前价
     */
    private double now;
    /**
     * 股票名称
     */
    private String name;
    /**
     * 股票代码
     */
    private String id;

    public Stock(double yesterday, double today, String name, String id) {
        this.yesterday = yesterday;
        this.today = today;
        this.name = name;
        this.id = id;
        this.now = today;
    }

    public double getYesterday() {
        return yesterday;
    }

    public void setYesterday(double yesterday) {
        this.yesterday = yesterday;
    }

    public double getToday() {
        return today;
    }

    public void setToday(double today) {
        this.today = today;
    }

    public double getNow() {
        return now;
    }

    public void setNow(double now) {
        this.now = now;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
    public String toString(){
        return this.name+":"+this.now;
    }
}

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <title>JQuery示例:动态股票信息</title>
    <script type="text/javascript" src="jslib/jquery.js"></script>
    <script type="text/javascript" src="jslib/jquerystock.js"></script>
</head>
<body>
    <div id="300001"><a href="#">上证指数:</a><span></span></div>
    <div id="000001"><a href="#">浦发银行:</a><span></span></div>
    <div id="stock">
        <div id="yes">昨收:<span></span></div>
        <div id="tod">今开:<span></span></div>
        <div id="now">当前:<span></span></div>
    </div>
</body>
</html>

//期望进入页面后就开始从服务器获取数据，然后显示股票价格
//保存服务器端返回的股票对象
var obj;
var sid;
$(document).ready(function(){
        //页面载入时隐藏弹出框
        var stockNode = $("#stock").css("border","1px solid black").width("150px")
                .css("position","absolute").css("z-index","99").css("background-color","blue")
                .css("color","yellow");
        stockNode.hide();
        var as = $("a");
        //定义鼠标进入股票名称时的操作
        as.mouseover(function(event){
            //获取当前股票的代码
            var aNode = $(this);
            var divNode = aNode.parent();
            sid = divNode.attr("id");
            //找到对应的股票对象
            updatediv();
            //需要控制弹出框的位置
            /*
            //1 找到当前连接的位置
            var offset = aNode.offset();
            //2 设置弹出框的位置
            stockNode.css("left",offset.left + "px").css("top",offset.top + aNode.height() + "px");
            */
            //期望出现在鼠标的右下方
            var myEvent = event||window.event;
            stockNode.css("left",myEvent.clientX+ 5 + "px").css("top",myEvent.clientY + 5 + "px");

            //弹出框显示
            stockNode.show();
        });
        //定义鼠标离开股票名称时的操作
        as.mouseout(function(event){
            //弹出框隐藏
            stockNode.hide();
        });
        getInfo();
        //3 每隔一秒中和服务器交互一次，用户不用刷新也可以不断看到股票的新信息
        setInterval(getInfo,1000)

});
//从服务器获取数据的方法
function getInfo(){
   //1 向服务器发起请求，获取数据
    $.get("GetStockInfo",null,function(data){
        //2 接收并解析数据
        //obj = eval(data);
        obj=data;
        //2.1 获取两只股票的当前指数
        var szzs = obj["300001"];//obj.s300001
        var pfyh = obj["000001"];
        /*
        * 遍历一个js对象
        * for(var stockid in obj){
        *     var stock = obj[stockid];
        * }
        * */
        //2.2 找到页面中对应的节点，然后填充最新的股票价格
        var span3 = $("#300001").children("span").html(szzs.now);
        if(szzs.now>szzs.yes){
            //当前价格大于昨天收盘，则显示红色
            span3.css("color","red")
        }else{
            span3.css("color","green")
        }
        var span1 = $("#000001").children("span").html(pfyh.now);
        if(pfyh.now>pfyh.yes){
            //当前价格大于昨天收盘，则显示红色
            span1.css("color","red")
        }else{
            span1.css("color","green")
        }
        updatediv();
    },"json")
}
//更新弹出框中的内容
function updatediv(){
    var stockobj = obj[sid];
    for(var proname in stockobj){
        if(proname != "name"){
            //找到对应的弹出框中的div节点，然后找到span字节点，将数据填充
            $("#" + proname).children("span").html(stockobj[proname]);
        }
    }
    
}