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使用JSON数据格式模拟股票实时信息

2015-06-14 15:30 513 查看
JQueryStock.html

<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>itcast.cn的JQuery实例：动态股票信息</title>
<script type="text/javascript" src="../jslib/jquery-2.1.4.min.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>


Stock.java

/**
* Created by IntelliJ IDEA.
* User: ming
* Date: 2008-6-14
* Time: 9:29:13
* To change this template use File | Settings | File Templates.
* 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;
}
}


GetStocksInfo.java

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

/**
* Created by IntelliJ IDEA.
* User: ming
* Date: 2008-6-14
* Time: 9:35:50
* To change this template use File | Settings | File Templates.
* 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;
protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
System.out.println("进入后台计算");
//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;

//通过随机数是奇数还是偶数来判断股票上涨还是下跌
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进行截取，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=UTF-8");
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的数据格式返回股票的信息
StringBuilder builder = new StringBuilder();
//采用数组的方式回传两个股票对象
/*
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，需要在最外层加上一个括号，否则页面解析会出错
builder.append("({")
.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("\"").append(pfyh.getId()).append("\":{name:\"").append(pfyh.getName())
.append("\",yes:").append(pfyh.getYesterday()).append(",tod:").append(pfyh.getToday())
.append(",now:").append(pfyh.getNow())
.append("}})");
out.println(builder);

}

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

public void init(ServletConfig servletConfig) 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 pfyh = new Stock(23.22, 23.50,"浦发银行","000001");

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

System.out.println(stocks);
}
}


jquerystock.js

//期望进入页面后就可以开始从服务器段获取数据，然后显示股票价格
//保存服务器段返回的股票对象
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){
//获取到当前股票的代码
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() {
//弹出框隐藏
stockNode.hide()
})
getInfo();
//3。每隔一秒钟和服务器交互一次，用户不用刷新页面就可以不断地看到最新的股票信息
setInterval(getInfo,1000);
});

//从服务器段获取数据并显示在页面上的的方法
function getInfo() {
//1。向服务器发起请求，获取数据
$.get("/Lesson6_jQuery_Demo1/GetStockInfo", null, function(data) {
//2.接收并解析数据
obj = eval(data);
//2.1获取两只股票的当前指数信息
var szzs = obj["300001"];  //obj.300001
var pfyh = obj["000001"];
/*
遍历一个js的对象
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");
span3.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");
span1.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();
})
}

//更新弹出框中得内容
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]);
}
}
}


web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">

<servlet>
<servlet-name>GetStockInfo</servlet-name>
<servlet-class>GetStocksInfo</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>GetStockInfo</servlet-name>
<url-pattern>/GetStockInfo</url-pattern>
</servlet-mapping>
</web-app>


JSON格式相当于是键值对对象
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