这里我们使用asp.net来获取当地天气、时间信息

前端页面：

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="GoogleWeatherAPI.aspx.cs" Inherits="EnhancementLot4.Tests.GoogleWeatherAPI" %> 
      
      
      
       
     

后端代码：

protected void Page_Load(object sender, EventArgs e)         {
   if (!string.IsNullOrEmpty(Request.QueryString["location"]))                 ltlWeather.Text = GetWeather(Request.QueryString["location"]);         } private string GetWeather(string location)         {
               HttpWebRequest GoogleRequest;             HttpWebResponse GoogleResponse = null;             XmlDocument GoogleXMLdoc = null; string weather = string.Empty; try             {
                   GoogleRequest = (HttpWebRequest)WebRequest.Create("http://www.google.com/ig/api?output=xml&hl=zh-cn&country=cn&weather=" + string.Format(location));                 GoogleResponse = (HttpWebResponse)GoogleRequest.GetResponse();                 GoogleXMLdoc = new XmlDocument();                 GoogleXMLdoc.XmlResolver = null;                 GoogleXMLdoc.Load(GoogleResponse.GetResponseStream());                 XmlNode root = GoogleXMLdoc.DocumentElement;                 XmlNodeList nodeList1 = root.SelectNodes("weather/forecast_information");                 weather = weather + "City : " + nodeList1.Item(0).SelectSingleNode("city").Attributes["data"].InnerText + "";                 XmlNodeList nodeList = root.SelectNodes("weather/current_conditions");                 weather = weather + "
     
      
       
        
           
            " + nodeList.Item(0).SelectSingleNode("temp_c").Attributes["data"].InnerText + " °C | " + nodeList.Item(0).SelectSingleNode("temp_f").Attributes["data"].InnerText + " °F
           ";                 weather = weather + "Current: " + nodeList.Item(0).SelectSingleNode("condition").Attributes["data"].InnerText + "";                 weather = weather + " " + nodeList.Item(0).SelectSingleNode("wind_condition").Attributes["data"].InnerText + "";                 weather = weather + " " + nodeList.Item(0).SelectSingleNode("humidity").Attributes["data"].InnerText;                 nodeList = root.SelectNodes("descendant::weather/forecast_conditions"); foreach (XmlNode nod in nodeList)                 {
                       weather = weather + "
        
" + nod.SelectSingleNode("day_of_week").Attributes["data"].InnerText + "";                     weather = weather + "";                     weather = weather + nod.SelectSingleNode("low").Attributes["data"].InnerText + "°F | ";                     weather = weather + nod.SelectSingleNode("high").Attributes["data"].InnerText + "°F";                 }                 weather = weather + "
       
      
     
";             } catch (System.Exception ex)             {
                   weather = ex.Message;             } finally             {
                   GoogleResponse.Close();             } return weather;         }

注意这里我们是通过http://www.google.com/ig/api?output=xml&hl=zh-cn&country=cn来获取中文显示的天气信息，上面的代码运行时会报错：

Invalid character in the given encoding

其原因是HttpWebRequest得到的Response是GB2312编码，而默认XmlDocument是UTF-8编码的，所以会报错。

解决很简单，只要将Response的Stream改为GB2312编码即可：

GoogleRequest = (HttpWebRequest)WebRequest.Create("http://www.google.com/ig/api?output=xml&hl=zh-cn&country=cn&weather=" + string.Format(location));                 GoogleResponse = (HttpWebResponse)GoogleRequest.GetResponse();                 GoogleXMLdoc = new XmlDocument();                 GoogleXMLdoc.XmlResolver = null;                 StreamReader reader = new StreamReader(GoogleResponse.GetResponseStream(), System.Text.Encoding.GetEncoding("GB2312"));                 GoogleXMLdoc.Load(reader);                 XmlNode root = GoogleXMLdoc.DocumentElement;

另附上英文显示的XML：

中文：

 

参考：