基于百度搜索开放平台的天气查询

思路：利用百度搜索开放平台，简单分析百度搜索URL参数，请求查询页面，再利用正则表达式，提取相关内容实现。

效果如下：

protected void On_Submit(object sender, EventArgs e)
    {
   string city = Request.Params["txtcity"].ToString();
        string tqyb = "天气预报";
        tqyb = HttpUtility.UrlEncode(tqyb, System.Text.Encoding.GetEncoding("gb2312"));
        city = HttpUtility.UrlEncode(city, System.Text.Encoding.GetEncoding("gb2312"));
        string url = string.Format("http://www.baidu.com/s?bs={0}+{1}f=8&wd={0}+{1}", tqyb, city);
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        System.IO.StreamReader reader = new System.IO.StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding("GB2312"));
        string html = reader.ReadToEnd();
        string pattern = "<\\s*TABLE cellspacing=\"0\" cellpadding=\"0\" class=\"al_wt\">([\\s\\S]*?)<\\s*\\/TABLE\\s*>";
        Regex reg = new Regex(pattern, RegexOptions.IgnoreCase);
        MatchCollection item = reg.Matches(html);
        foreach (Match m in item)
        {
            html = m.Value;
        }
        Div_html.InnerHtml = html;
    }

当city为空时，查询是你所在城市的天气，你所在城市计算方法应该是根据你的机子的IP来算的，这个具体百度是怎么做的，还有待研究。

百度搜索用的是GB2312编码，所以利用HttpUtility.UrlEncode要做一个简单转换。

代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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 runat="server">
    <title>天气预报</title>
    <style type="text/css">
        .al_wt
        {
            margin-top: 5px;
        }
        .al_wt td
        {
            font-size: 14px;
            line-height: 22px;
            text-align: center;
            vertical-align: top;
        }
        .al_wt td img
        {
            margin: 5px 0;
            width: 48px;
            height: 48px;
            border: none;
        }
        .al_wt td img.al_il
        {
            margin-right: 10px;
        }
        .al_wt td span
        {
            font-size: 13px;
        }
        .al_wt td div
        {
            text-align: center;
            padding: 0 5px;
            white-space: nowrap;
        }
        .al_wt .altime_special
        {
            white-space: nowrap;
        }
        .al_wt .altemp_special
        {
            font-size: 15px;
            white-space: nowrap;
        }
        .al_wt .altd_normal strong
        {
            font-weight: normal;
            font-size: 14px;
        }
        .al_wt .altd_normal .altime_special, .al_wt .altd_normal .altemp_special
        {
            white-space: normal;
        }
        .al_wt td.al_tr
        {
            padding-right: 20px;
        }
        .al_wt td.al_tl
        {
            padding-left: 20px;
            border-left: 1px solid #e2e9fc;
        }
        .al_wlink
        {
            font-size: 12px;
            color: #666;
            padding: 5px 0;
            line-height: 20px;
        }
        .al_wlink a
        {
            color: #77c;
            margin: 0 5px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        城市：
        <input type="text" id="txtcity" runat="server" />
        <input type="button" runat="server" id="Submit" value="查询" onserverclick="On_Submit" />
    </div>
    <div id="Div_html" runat="server">
    </div>
    </form>
</body>
</html>

posted @ 2010-05-13 22:11 伽马科技.攻城师阅读(817) 评论(0) 编辑收藏举报

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基于百度搜索开放平台的天气查询

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