查询天气预报的Webservice接口程序源代码

前一段时间在做毕设的时候需要做一个天气预报服务接口，发现很多网友也在找这方面的资料，现将我我写这个web服务源代码公布如下，希望大家共同学习，共同进步．

<%@ WebService Language="c#" Class="WeatherWS.GetChinaWeather" %>
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Net;
using System.Text;
using System.IO;
using System.Web;
using System.Web.Services;

namespace WeatherWS
{
/// <summary>
/// GetChinaWeather 的摘要说明。
/// </summary>
[WebService(Namespace="http://flying.redv.com/monster")]
public class GetChinaWeather : System.Web.Services.WebService
{
public GetChinaWeather()
{
//CODEGEN: 该调用是 ASP.NET Web 服务设计器所必需的
InitializeComponent();
}

#region 组件设计器生成的代码

//Web 服务设计器所必需的
private IContainer components = null;

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if(disposing && components != null)
{
components.Dispose();
}
base.Dispose(disposing);
}

#endregion

[WebMethod(Description="中国各城市(县)天气预报获取服务,可接受一字符串参数（可选的查询方式：·国内城市（县）全名·字首拼音缩写·电话区号·邮政编码,如查询徐州的天气情况可输入'徐州'或'xz'作为参数）")]
public DataSet getWeather(string strCity)
{
DataSet dsWeather = new DataSet();
try
{
const int maxDay=5;
string []time = new string[maxDay];//存储日期，从今天开始算起
string []weather = new string[maxDay];//保存天气情况数据
string []max = new string[maxDay];//保存最高温度数据
string []min = new string[maxDay];//保存最低温度数据
string []wind = new string[maxDay];//保存风向数据

//发送一个post请求到index.jsp页面以获取城市数据
Uri uri = new Uri("http://www.weathercn.com/forecastn/forcast/index.jsp?searchname="+System.Web.HttpUtility.UrlEncode(strCity,System.Text.Encoding.GetEncoding("GB2312")));
WebRequest wreq=WebRequest.Create(uri);

HttpWebResponse wresp=(HttpWebResponse)wreq.GetResponse();

string HTML ="";

Stream s=wresp.GetResponseStream();

StreamReader objReader = new StreamReader(s,System.Text.Encoding.Default);
HTML=objReader.ReadToEnd();
if(HTML==null||HTML=="")
return dsWeather;

HTML = HTML.ToLower();//全部转换为小写
if(HTML==null||HTML=="")
return dsWeather;
int head,tail,i;
//查找城市数据 如果没有找到 则返回一个空的dataset
head = HTML.IndexOf("查询结果：",0);
head = HTML.IndexOf("station_name=",head);
if(head==-1)
{
return dsWeather;
}
head = HTML.IndexOf("station_name=",head+1);
tail = HTML.IndexOf("'",head);
string strCityData = HTML.Substring(head,tail-head);//城市数据获取
string href = "http://www.weathercn.com/forecastn/forcast/forecastDetail.jsp?"+strCityData;
//根据城市数据去查询天气情况

wreq=WebRequest.Create(href);
wresp=(HttpWebResponse)wreq.GetResponse();

HTML ="";
s=wresp.GetResponseStream();

objReader = new StreamReader(s,System.Text.Encoding.Default);
HTML=objReader.ReadToEnd();
if(HTML==null||HTML=="")
return dsWeather;
HTML = HTML.ToLower();//全部转换为小写

DateTime dtNow = new DateTime();
dtNow = DateTime.Today;//获取系统当前日期
dtNow = dtNow.Subtract(TimeSpan.Parse("1"));
for(i=0;i<maxDay;i++)
{
dtNow = dtNow.Add(TimeSpan.Parse("1"));
time[i] = dtNow.ToShortDateString();//日期数据
}

//获取天气情况数据,总共maxDay天的数据
String date = DateTime.Now.Year.ToString()+"年"+DateTime.Now.Month.ToString()+"月";//当前年月
head = HTML.IndexOf(date,0);
head = HTML.IndexOf("<tr>",head);
for(i=0;i<maxDay;i++)
{
head = HTML.IndexOf("<td",head);
head = HTML.IndexOf("<img",head);
head = HTML.IndexOf("/",head);
head = HTML.IndexOf("/",head+1);
tail = HTML.IndexOf("_",head);
weather[i] = HTML.Substring(head+1,tail-head-1);
head = HTML.IndexOf("</td>",head);
}

//获取近maxDay天温度数据,包括最高温度和最低温度
for(i=0;i<maxDay;i++)
{
head = HTML.IndexOf("max",head);
head = HTML.IndexOf(">",head);
tail = HTML.IndexOf("<",head);
max[i] = HTML.Substring(head+1,tail-head-1);//最高温度

head = HTML.IndexOf("min",head);
head = HTML.IndexOf(">",head);
tail = HTML.IndexOf("<",head);
min[i] = HTML.Substring(head+1,tail-head-1);//最低温度
}

//最近maxDay天的风向数据
head = HTML.IndexOf("<tr",head);
for(i=0;i<maxDay;i++)
{
head = HTML.IndexOf("class",head);
head = HTML.IndexOf(">",head);
tail = HTML.IndexOf("<",head);
wind[i] = HTML.Substring(head+1,tail-head-1);//风向数据
}

//将数据填充到DataSet中去
DataTable dtWeather = new DataTable();
dtWeather.Columns.Add("日期");
dtWeather.Columns.Add("天气");
dtWeather.Columns.Add("最高温度");
dtWeather.Columns.Add("最低温度");
dtWeather.Columns.Add("风力风向");
for(i=0;i<maxDay;i++)
{
DataRow drWeather = dtWeather.NewRow();
drWeather["日期"] = time[i];
drWeather["天气"] = weather[i];
drWeather["最高温度"] = max[i];
drWeather["最低温度"] = min[i];
drWeather["风力风向"] = wind[i];
dtWeather.Rows.Add(drWeather);
}
dsWeather.Tables.Add(dtWeather);
dsWeather.AcceptChanges();

return dsWeather;

}
catch(Exception e)
{
//DO Something
return dsWeather;
}
}
}
}