http://www.cnblogs.com/beimeng/p/3789940.html
网站虽小，五脏俱全（干货）
前言
最近一个朋友让帮忙做一个汇率换算的网站,用业余时间，到最后总算是实现了其需要的功能,其中也用到了一些相关的技术，把它写出来，给大家做一个参考，也给自己一个总结！
需求
1.按指定需求根据最新汇率进行汇率的换算,这就需要得到最新的汇率值
2.实现QQ弹出对话功能
3.后台返回换算后的money，汇率，服务费等数据
4.实现页面无刷新
具体实现一：前台代码实现
前台就是界面的布局，一些HTML代码,前台不是很熟,大家就不用挑剔了，看看界面实现就行了。主要的一个实现就是QQ弹出对话功能,QQ号码换成自己的了。各位有需要的看官可以直接copy此功能
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>澳元人民币汇率计算</title>
<script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script src="Scripts/cc.js" type="text/javascript"></script>
<style type="text/css">
#img{ background-image: url(Image/bg2.jpg);
width:710px;
height:250px;
margin-left:40px;}
.top { display:block;
margin-top:5px;
margin-bottom:5px;
line-height:30px;}
.wenzi{ font-size:12px;}
.shuomingli{border-bottom: #930 2px solid;
display:block;
margin-top:5px;
margin-bottom:5px;
line-height:30px;}
a{ color: #03F;
text-decoration:none;}
a:hover{ color:#F00;}
</style>
</head>
<body>
<div style="margin:30px auto; padding:0px; width:750px;">
<div id="img">
</div>
<form id="form1" runat="server">
<ul style="list-style:none;">
<li style="background: #900; height:25px;"><span style="color:#FFF; font-size:14px;line-height:25px;"> <b>汇率计算:</b></span>
</li>
<li class="top"><span style="font-size:14px;">需要<span style="color:#C00;"><strong>兑换</strong></span>的<span style="color: #C00;"><strong>人民币</strong></span>：</span><input id="txtAmount" type="text" /><span style="font-size:14px;"> 汇率为: <input id="rate" style="width:90px;" type="text" readonly="readonly"/></span><span style="font-size:14px;"> 服务费为: <input id="serverCharge" style="width:100px;" type="text" readonly="readonly"/></span><a href="tencent://message/?Menu=yes&uin=331341164&Service=200&sigT=dcfc1fdf4a83b1602a334a540048009f26d65d6f377f8dc66c97d8ecc64228e8b8441583f92b707a"><span><img style=" border:0px; vertical-align: middle; padding-bottom:5px; padding-left:2px;" src="Image/button_11.gif"></span></a>
</li>
<li class="top"><span style="font-size:14px;">需要<span style="color:#C00;"><strong>支付</strong></span>的<span style="color:#C00;"><strong>澳 元</stong></span>：</span><input id="txtPay" type="text" readonly="readonly"/><input id="submit" style=" background-color: #CCC" type="button" value="计算" />
<li class="top"><span style="font-size:12px;">最新汇率查询:<a href="http://www.boc.cn/sourcedb/whpj/" target="_Blank"> 中国银行实时汇率</a></span>
</li>
</ul>
</form>
<ul style="list-style:none;">
<li style="background: #900; height:25px;"><span style="line-height:25px; font-size:14px; color:#FFF;"><b> 兑换说明：</b></span>
</li>
<li class="shuomingli"><span class="wenzi">1.以上兑换所用基础汇率均为最新汇率，可以查询相关网站以验证。</span>
</li>
<li class="shuomingli"><span class="wenzi">2.所使用汇率由兑换人民币钱数多少决定。兑换钱数越多汇率越接近实时汇率。
</span>
</li>
<li class="shuomingli"><span class="wenzi">3.经以上步骤所得的价格最后再加5%的服务费即为最所需要您支付的澳元总额，若多次交易者手续费可商议而定。</span>
</li>
<li class="shuomingli"><span class="wenzi">4.如有问题请联系QQ:331341164</span>
</li>
</ul>
</div>
</body>
</html>
具体实现二：最新汇率的获取
最好的实现当然是通过付费的webservices来获取最新的实时汇率，但是咱这只是一个简单的实现，我是通过抓取《中国银行外汇牌价》来得到汇率值,其中用到了一个HTML解析组件：HtmlAgilityPack,大家可以去了解一下,具体实现参考了网上的一些demo,代码如下：
/// <summary> 获取远程HTML内容</summary>
/// <param name="url">远程网页地址URL</param>
/// <returns>成功返回远程HTML的代码内容</returns>
private string GetWebContent(string strUrl)
{
string str = "";
try
{
WebClient wc = new WebClient();
wc.Credentials = CredentialCache.DefaultCredentials;
Encoding enc = Encoding.GetEncoding("UTF-8");// 如果是乱码就改成 UTF-8 / GB2312
Stream res = wc.OpenRead(strUrl);//以流的形式打开URL
StreamReader sr = new StreamReader(res, enc);//以指定的编码方式读取数据流
str = sr.ReadToEnd();//输出(HTML代码)
res.Close();
wc.Dispose();
}
catch (Exception ex)
{
return "";
}
return str;
}
private DataTable GetRateTable(string strHtml)
{
DataTable dt = new DataTable();
DataColumn col1 = new DataColumn("Currency Name", typeof(string));
DataColumn col2 = new DataColumn("Buying Rate", typeof(string));
DataColumn col3 = new DataColumn("Cash Buying Rate", typeof(string));
DataColumn col4 = new DataColumn("Selling Rate", typeof(string));
DataColumn col5 = new DataColumn("Cash Selling Rate", typeof(string));
DataColumn col6 = new DataColumn("Middle Rate", typeof(string));
DataColumn col7 = new DataColumn("Pub Time", typeof(string));
dt.Columns.Add(col1);
dt.Columns.Add(col2);
dt.Columns.Add(col3);
dt.Columns.Add(col4);
dt.Columns.Add(col5);
dt.Columns.Add(col6);
dt.Columns.Add(col7);
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(strHtml);
doc.OptionOutputAsXml = true;
HtmlAgilityPack.HtmlNode node = doc.DocumentNode.SelectSingleNode(".//table[tr/th=\"Currency Name\"]");
if (node == null)
{
return null;
}
HtmlAgilityPack.HtmlNodeCollection trNodeList = node.SelectNodes("tr[td]");
foreach (HtmlAgilityPack.HtmlNode trNode in trNodeList)
{
DataRow dr = dt.NewRow();
for (int j = 0; j < 7; j++)
{
HtmlAgilityPack.HtmlNodeCollection tdNodeList = trNode.SelectNodes("td");
dr[j] = tdNodeList[j].InnerText.Replace(" ", " "); ;
}
dt.Rows.Add(dr);
}
return dt;
}
/// <summary>
/// 根据国家的代码编号，得到汇率值
/// </summary>
/// <param name="No">国家代码</param>
/// <returns></returns>
private decimal GetRateByCountryNo(string No)
{
decimal rate = 0M;
try
{
string html = GetWebContent("http://www.boc.cn/sourcedb/whpj/enindex.html").Trim();
DataTable dt = GetRateTable(html);
if (dt == null)
rate = 0M;
else
{
for (int i = 0; i < dt.Rows.Count; i++)
{
if (dt.Rows[i]["Currency Name"].ToString() == No)
{
rate = Convert.ToDecimal(dt.Rows[i]["Cash Buying Rate"].ToString()) / 100;
}
}
}
}
catch (Exception)
{
rate = 0M;
}
return rate;
}
具体实现三：后台数据到前台展示
因为是返回多个数据，返回的josn格式的数据,其中用到了序列化组件：Newtonsoft.Json.Net20,将需要返回的数据全部装在一个数据实体类里面,然后进行序列化，返回到前台,再进行解析,后台代码如下：
public class Handler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
WebClient web = new WebClient();
//string url = string.Format("http://finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s={0}{1}=X", "AUD", "CNY");
//string response = web.DownloadString(url);
//string[] values = Regex.Split(response, ",");
decimal rate = GetRateByCountryNo("AUD");
decimal amount = 0M;
//decimal result = 0M;
string returnStr = "";
if (rate == 0M)
returnStr = ToJson("通信出错,请稍后再试........");
else
{
try
{
ReturnModel model = new ReturnModel();
amount = System.Convert.ToDecimal(context.Request["amount"]);
//decimal rate = 5.82M;//System.Convert.ToDecimal(values[1]);
if (amount > 0 && amount <= 1000)
{
model.Rate = Math.Round(rate - 0.6M, 2);
model.Result = Math.Round(amount / model.Rate, 2);
model.ServerCharge = Math.Round(model.Result * 0.05M, 2);
}
else if (amount > 1000 && amount <= 5000)
{
model.Rate = Math.Round(rate - 0.4M, 2);
model.Result = Math.Round(amount / model.Rate, 2);
model.ServerCharge = Math.Round(model.Result * 0.05M, 2);
}
else if (amount > 5000)
{
model.Rate = Math.Round(rate - 0.3M, 2);
model.Result = Math.Round(amount / model.Rate, 2);
model.ServerCharge = Math.Round(model.Result * 0.05M, 2);
}
returnStr = ToJson(model);
}
catch (Exception)
{
returnStr = ToJson("输入金额错误");
}
}
context.Response.Write(returnStr);
}
/// <summary>
/// 将object对象进行序列化
/// </summary>
/// <param name="t"></param>
/// <returns></returns>
public static string ToJson(object t)
{
return JsonConvert.SerializeObject(t, Formatting.Indented,
new JsonSerializerSettings { NullValueHandling = NullValueHandling.Include });
}
}
具体实现四：ajax实现及前台数据解析
无刷新实现通过jquery 封装的ajax来实现，直接上代码：
$(document).ready(function () {
$(‘#submit‘).click(function () {
var errormsg = "";
var amount = $(‘#txtAmount‘).val();
$.ajax({ type: "POST",
url: "Handler.ashx",
data: { amount: amount },
contentType: "application/x-www-form-urlencoded",
dataType: "json",
beforeSend: function () {
$(‘#txtPay‘).val("正在转换...");
},
success: function (data) {
$(‘#txtPay‘).val(data.Result);
$(‘#rate‘).val(data.Rate);
$(‘#serverCharge‘).val(data.ServerCharge);
},
error: function (jqXHR, exception) {
if (jqXHR.status === 0) {
errormsg = ‘Not connect.\n Verify Network.‘; ;
} else if (jqXHR.status == 404) {
errormsg = ‘Requested page not found. [404]‘; ;
} else if (jqXHR.status == 500) {
errormsg = ‘Internal Server Error [500].‘; ;
} else if (exception === ‘parsererror‘) {
errormsg = ‘Requested JSON parse failed.‘; ;
} else if (exception === ‘timeout‘) {
errormsg = ‘Time out error.‘; ;
} else if (exception === ‘abort‘) {
errormsg = ‘Ajax request aborted.‘; ;
} else {
errormsg = ‘Uncaught Error.‘;
}
alert(errormsg);
}
});
});
});
总结
至此,一个小小的功能网站就算是完成了，主要关键步骤就是汇率的获取这里，也涉及其他的技术点,就说这么多吧，觉得好的给个赞！
源码下载：猛戳这里！
时间： 2024-10-17 20:06:32