基于C#的全国天气查询API调用代码实例

原文链接：https://www.iteye.com/blog/jammk-2347568

全国天气查询API：https://www.juhe.cn/docs/api/id/39

基于C#的全国天气查询API调用代码实例

C#代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using Xfrog.Net;
using System.Diagnostics;
using System.Web;
//----------------------------------
// 全国天气预报调用示例代码－聚合数据
// 在线接口文档：http://www.juhe.cn/docs/39
// 代码中JsonObject类下载地址:http://download.csdn.net/download/gcm3206021155665/7458439
//----------------------------------
namespace ConsoleAPI
{
class Program
{
static void Main(string[] args)
{
string appkey = "*******************"; //配置您申请的appkey
//1.根据城市名/id查询天气
string url1 = "http://v.juhe.cn/weather/index";
var parameters1 = new Dictionary<string, string>();
parameters1.Add("cityname" , ""); //城市名或城市ID，如："苏州"，需要utf8 urlencode
parameters1.Add("dtype" , ""); //返回数据格式：json或xml,默认json
parameters1.Add("format" , ""); //未来6天预报(future)两种返回格式，1或2，默认1
parameters1.Add("key", appkey);//你申请的key
string result1 = sendPost(url1, parameters1, "get");
JsonObject newObj1 = new JsonObject(result1);
String errorCode1 = newObj1["error_code"].Value;
if (errorCode1 == "0")
{
Debug.WriteLine("成功");
Debug.WriteLine(newObj1);
}
else
{
//Debug.WriteLine("失败");
Debug.WriteLine(newObj1["error_code"].Value+":"+newObj1["reason"].Value);
}
//2.天气种类及标识列表
string url2 = "http://v.juhe.cn/weather/uni";
var parameters2 = new Dictionary<string, string>();
parameters2.Add("key", appkey);//你申请的key
parameters2.Add("dtype" , ""); //返回数据的格式,xml或json，默认json
string result2 = sendPost(url2, parameters2, "get");
JsonObject newObj2 = new JsonObject(result2);
String errorCode2 = newObj2["error_code"].Value;
if (errorCode2 == "0")
{
Debug.WriteLine("成功");
Debug.WriteLine(newObj2);
}
else
{
//Debug.WriteLine("失败");
Debug.WriteLine(newObj2["error_code"].Value+":"+newObj2["reason"].Value);
}
//3.根据IP查询天气
string url3 = "http://v.juhe.cn/weather/ip";
var parameters3 = new Dictionary<string, string>();
parameters3.Add("ip" , ""); //ip地址，如：58.215.185.154
parameters3.Add("dtype" , ""); //返回数据格式：json或xml,默认json
parameters3.Add("format" , ""); //未来6天预报(future)两种返回格式，1或2，默认1
parameters3.Add("key", appkey);//你申请的key
string result3 = sendPost(url3, parameters3, "get");
JsonObject newObj3 = new JsonObject(result3);
String errorCode3 = newObj3["error_code"].Value;
if (errorCode3 == "0")
{
Debug.WriteLine("成功");
Debug.WriteLine(newObj3);
}
else
{
//Debug.WriteLine("失败");
Debug.WriteLine(newObj3["error_code"].Value+":"+newObj3["reason"].Value);
}
//4.根据GPS坐标查询天气
string url4 = "http://v.juhe.cn/weather/geo";
var parameters4 = new Dictionary<string, string>();
parameters4.Add("lon" , ""); //经度，如：116.39277
parameters4.Add("lat" , ""); //纬度，如：39.933748
parameters4.Add("format" , ""); //未来6天预报(future)两种返回格式，1或2，默认1
parameters4.Add("dtype" , ""); //返回数据格式：json或xml,默认json
parameters4.Add("key", appkey);//你申请的key
string result4 = sendPost(url4, parameters4, "get");
JsonObject newObj4 = new JsonObject(result4);
String errorCode4 = newObj4["error_code"].Value;
if (errorCode4 == "0")
{
Debug.WriteLine("成功");
Debug.WriteLine(newObj4);
}
else
{
//Debug.WriteLine("失败");
Debug.WriteLine(newObj4["error_code"].Value+":"+newObj4["reason"].Value);
}
//5.城市天气三小时预报
string url5 = "http://v.juhe.cn/weather/forecast3h";
var parameters5 = new Dictionary<string, string>();
parameters5.Add("cityname" , ""); //城市名，如："苏州"
parameters5.Add("dtype" , ""); //返回数据格式：json或xml,默认json
parameters5.Add("key", appkey);//你申请的key
string result5 = sendPost(url5, parameters5, "get");
JsonObject newObj5 = new JsonObject(result5);
String errorCode5 = newObj5["error_code"].Value;
if (errorCode5 == "0")
{
Debug.WriteLine("成功");
Debug.WriteLine(newObj5);
}
else
{
//Debug.WriteLine("失败");
Debug.WriteLine(newObj5["error_code"].Value+":"+newObj5["reason"].Value);
}
//6.支持城市列表
string url6 = "http://v.juhe.cn/weather/citys";
var parameters6 = new Dictionary<string, string>();
parameters6.Add("dtype" , ""); //返回数据格式：json或xml,默认json
parameters6.Add("key", appkey);//你申请的key
string result6 = sendPost(url6, parameters6, "get");
JsonObject newObj6 = new JsonObject(result6);
String errorCode6 = newObj6["error_code"].Value;
if (errorCode6 == "0")
{
Debug.WriteLine("成功");
Debug.WriteLine(newObj6);
}
else
{
//Debug.WriteLine("失败");
Debug.WriteLine(newObj6["error_code"].Value+":"+newObj6["reason"].Value);
}
}
/// <summary>
/// Http (GET/POST)
/// </summary>
/// <param name="url">请求URL</param>
/// <param name="parameters">请求参数</param>
/// <param name="method">请求方法</param>
/// <returns>响应内容</returns>
static string sendPost(string url, IDictionary<string, string> parameters, string method)
{
if (method.ToLower() == "post")
{
HttpWebRequest req = null;
HttpWebResponse rsp = null;
System.IO.Stream reqStream = null;
try
{
req = (HttpWebRequest)WebRequest.Create(url);
req.Method = method;
req.KeepAlive = false;
req.ProtocolVersion = HttpVersion.Version10;
req.Timeout = 5000;
req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";
byte[] postData = Encoding.UTF8.GetBytes(BuildQuery(parameters, "utf8"));
reqStream = req.GetRequestStream();
reqStream.Write(postData, 0, postData.Length);
rsp = (HttpWebResponse)req.GetResponse();
Encoding encoding = Encoding.GetEncoding(rsp.CharacterSet);
return GetResponseAsString(rsp, encoding);
}
catch (Exception ex)
{
return ex.Message;
}
finally
{
if (reqStream != null) reqStream.Close();
if (rsp != null) rsp.Close();
}
}
else
{
//创建请求
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url + "?" + BuildQuery(parameters, "utf8"));
//GET请求
request.Method = "GET";
request.ReadWriteTimeout = 5000;
request.ContentType = "text/html;charset=UTF-8";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
//返回内容
string retString = myStreamReader.ReadToEnd();
return retString;
}
}
/// <summary>
/// 组装普通文本请求参数。
/// </summary>
/// <param name="parameters">Key-Value形式请求参数字典</param>
/// <returns>URL编码后的请求数据</returns>
static string BuildQuery(IDictionary<string, string> parameters, string encode)
{
StringBuilder postData = new StringBuilder();
bool hasParam = false;
IEnumerator<KeyValuePair<string, string>> dem = parameters.GetEnumerator();
while (dem.MoveNext())
{
string name = dem.Current.Key;
string value = dem.Current.Value;
// 忽略参数名或参数值为空的参数
if (!string.IsNullOrEmpty(name))//&& !string.IsNullOrEmpty(value)
{
if (hasParam)
{
postData.Append("&");
}
postData.Append(name);
postData.Append("=");
if (encode == "gb2312")
{
postData.Append(HttpUtility.UrlEncode(value, Encoding.GetEncoding("gb2312")));
}
else if (encode == "utf8")
{
postData.Append(HttpUtility.UrlEncode(value, Encoding.UTF8));
}
else
{
postData.Append(value);
}
hasParam = true;
}
}
return postData.ToString();
}
/// <summary>
/// 把响应流转换为文本。
/// </summary>
/// <param name="rsp">响应流对象</param>
/// <param name="encoding">编码方式</param>
/// <returns>响应文本</returns>
static string GetResponseAsString(HttpWebResponse rsp, Encoding encoding)
{
System.IO.Stream stream = null;
StreamReader reader = null;
try
{
// 以字符流的方式读取HTTP响应
stream = rsp.GetResponseStream();
reader = new StreamReader(stream, encoding);
return reader.ReadToEnd();
}
finally
{
// 释放资源
if (reader != null) reader.Close();
if (stream != null) stream.Close();
if (rsp != null) rsp.Close();
}
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using Xfrog.Net;
using System.Diagnostics;
using System.Web;
//----------------------------------

// 全国天气预报调用示例代码 － 聚合数据

// 在线接口文档：http://www.juhe.cn/docs/39

// 代码中JsonObject类下载地址:http://download.csdn.net/download/gcm3206021155665/7458439

//----------------------------------
namespace ConsoleAPI

{

class Program

{

static void Main(string[] args)

{

string appkey = "*******************"; //配置您申请的appkey
        //1.根据城市名/id查询天气
        string url1 = "http://v.juhe.cn/weather/index";

        var parameters1 = new Dictionary&lt;string, string&gt;();

        parameters1.Add("cityname" , ""); //城市名或城市ID，如：&amp;quot;苏州&amp;quot;，需要utf8 urlencode
        parameters1.Add("dtype" , ""); //返回数据格式：json或xml,默认json
        parameters1.Add("format" , ""); //未来6天预报(future)两种返回格式，1或2，默认1
        parameters1.Add("key", appkey);//你申请的key

        string result1 = sendPost(url1, parameters1, "get");

        JsonObject newObj1 = new JsonObject(result1);
        String errorCode1 = newObj1["error_code"].Value;

        if (errorCode1 == "0")
        {
            Debug.WriteLine("成功");
            Debug.WriteLine(newObj1);
        }
        else
        {
            //Debug.WriteLine("失败");
            Debug.WriteLine(newObj1["error_code"].Value+":"+newObj1["reason"].Value);
        }


        //2.天气种类及标识列表
        string url2 = "http://v.juhe.cn/weather/uni";

        var parameters2 = new Dictionary&lt;string, string&gt;();

        parameters2.Add("key", appkey);//你申请的key
        parameters2.Add("dtype" , ""); //返回数据的格式,xml或json，默认json

        string result2 = sendPost(url2, parameters2, "get");

        JsonObject newObj2 = new JsonObject(result2);
        String errorCode2 = newObj2["error_code"].Value;

        if (errorCode2 == "0")
        {
            Debug.WriteLine("成功");
            Debug.WriteLine(newObj2);
        }
        else
        {
            //Debug.WriteLine("失败");
            Debug.WriteLine(newObj2["error_code"].Value+":"+newObj2["reason"].Value);
        }


        //3.根据IP查询天气
        string url3 = "http://v.juhe.cn/weather/ip";

        var parameters3 = new Dictionary&lt;string, string&gt;();

        parameters3.Add("ip" , ""); //ip地址，如：58.215.185.154
        parameters3.Add("dtype" , ""); //返回数据格式：json或xml,默认json
        parameters3.Add("format" , ""); //未来6天预报(future)两种返回格式，1或2，默认1
        parameters3.Add("key", appkey);//你申请的key

        string result3 = sendPost(url3, parameters3, "get");

        JsonObject newObj3 = new JsonObject(result3);
        String errorCode3 = newObj3["error_code"].Value;

        if (errorCode3 == "0")
        {
            Debug.WriteLine("成功");
            Debug.WriteLine(newObj3);
        }
        else
        {
            //Debug.WriteLine("失败");
            Debug.WriteLine(newObj3["error_code"].Value+":"+newObj3["reason"].Value);
        }


        //4.根据GPS坐标查询天气
        string url4 = "http://v.juhe.cn/weather/geo";

        var parameters4 = new Dictionary&lt;string, string&gt;();

        parameters4.Add("lon" , ""); //经度，如：116.39277
        parameters4.Add("lat" , ""); //纬度，如：39.933748
        parameters4.Add("format" , ""); //未来6天预报(future)两种返回格式，1或2，默认1
        parameters4.Add("dtype" , ""); //返回数据格式：json或xml,默认json
        parameters4.Add("key", appkey);//你申请的key

        string result4 = sendPost(url4, parameters4, "get");

        JsonObject newObj4 = new JsonObject(result4);
        String errorCode4 = newObj4["error_code"].Value;

        if (errorCode4 == "0")
        {
            Debug.WriteLine("成功");
            Debug.WriteLine(newObj4);
        }
        else
        {
            //Debug.WriteLine("失败");
            Debug.WriteLine(newObj4["error_code"].Value+":"+newObj4["reason"].Value);
        }


        //5.城市天气三小时预报
        string url5 = "http://v.juhe.cn/weather/forecast3h";

        var parameters5 = new Dictionary&lt;string, string&gt;();

        parameters5.Add("cityname" , ""); //城市名，如：&amp;quot;苏州&amp;quot;
        parameters5.Add("dtype" , ""); //返回数据格式：json或xml,默认json
        parameters5.Add("key", appkey);//你申请的key

        string result5 = sendPost(url5, parameters5, "get");

        JsonObject newObj5 = new JsonObject(result5);
        String errorCode5 = newObj5["error_code"].Value;

        if (errorCode5 == "0")
        {
            Debug.WriteLine("成功");
            Debug.WriteLine(newObj5);
        }
        else
        {
            //Debug.WriteLine("失败");
            Debug.WriteLine(newObj5["error_code"].Value+":"+newObj5["reason"].Value);
        }


        //6.支持城市列表
        string url6 = "http://v.juhe.cn/weather/citys";

        var parameters6 = new Dictionary&lt;string, string&gt;();

        parameters6.Add("dtype" , ""); //返回数据格式：json或xml,默认json
        parameters6.Add("key", appkey);//你申请的key

        string result6 = sendPost(url6, parameters6, "get");

        JsonObject newObj6 = new JsonObject(result6);
        String errorCode6 = newObj6["error_code"].Value;

        if (errorCode6 == "0")
        {
            Debug.WriteLine("成功");
            Debug.WriteLine(newObj6);
        }
        else
        {
            //Debug.WriteLine("失败");
            Debug.WriteLine(newObj6["error_code"].Value+":"+newObj6["reason"].Value);
        }


    }

    /// &lt;summary&gt;
    /// Http (GET/POST)
    /// &lt;/summary&gt;
    /// &lt;param name="url"&gt;请求URL&lt;/param&gt;
    /// &lt;param name="parameters"&gt;请求参数&lt;/param&gt;
    /// &lt;param name="method"&gt;请求方法&lt;/param&gt;
    /// &lt;returns&gt;响应内容&lt;/returns&gt;
    static string sendPost(string url, IDictionary&lt;string, string&gt; parameters, string method)
    {
        if (method.ToLower() == "post")
        {
            HttpWebRequest req = null;
            HttpWebResponse rsp = null;
            System.IO.Stream reqStream = null;
            try
            {
                req = (HttpWebRequest)WebRequest.Create(url);
                req.Method = method;
                req.KeepAlive = false;
                req.ProtocolVersion = HttpVersion.Version10;
                req.Timeout = 5000;
                req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";
                byte[] postData = Encoding.UTF8.GetBytes(BuildQuery(parameters, "utf8"));
                reqStream = req.GetRequestStream();
                reqStream.Write(postData, 0, postData.Length);
                rsp = (HttpWebResponse)req.GetResponse();
                Encoding encoding = Encoding.GetEncoding(rsp.CharacterSet);
                return GetResponseAsString(rsp, encoding);
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
            finally
            {
                if (reqStream != null) reqStream.Close();
                if (rsp != null) rsp.Close();
            }
        }
        else
        {
            //创建请求
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url + "?" + BuildQuery(parameters, "utf8"));

            //GET请求
            request.Method = "GET";
            request.ReadWriteTimeout = 5000;
            request.ContentType = "text/html;charset=UTF-8";
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));

            //返回内容
            string retString = myStreamReader.ReadToEnd();
            return retString;
        }
    }

    /// &lt;summary&gt;
    /// 组装普通文本请求参数。
    /// &lt;/summary&gt;
    /// &lt;param name="parameters"&gt;Key-Value形式请求参数字典&lt;/param&gt;
    /// &lt;returns&gt;URL编码后的请求数据&lt;/returns&gt;
    static string BuildQuery(IDictionary&lt;string, string&gt; parameters, string encode)
    {
        StringBuilder postData = new StringBuilder();
        bool hasParam = false;
        IEnumerator&lt;KeyValuePair&lt;string, string&gt;&gt; dem = parameters.GetEnumerator();
        while (dem.MoveNext())
        {
            string name = dem.Current.Key;
            string value = dem.Current.Value;
            // 忽略参数名或参数值为空的参数
            if (!string.IsNullOrEmpty(name))//&amp;&amp; !string.IsNullOrEmpty(value)
            {
                if (hasParam)
                {
                    postData.Append("&amp;");
                }
                postData.Append(name);
                postData.Append("=");
                if (encode == "gb2312")
                {
                    postData.Append(HttpUtility.UrlEncode(value, Encoding.GetEncoding("gb2312")));
                }
                else if (encode == "utf8")
                {
                    postData.Append(HttpUtility.UrlEncode(value, Encoding.UTF8));
                }
                else
                {
                    postData.Append(value);
                }
                hasParam = true;
            }
        }
        return postData.ToString();
    }

    /// &lt;summary&gt;
    /// 把响应流转换为文本。
    /// &lt;/summary&gt;
    /// &lt;param name="rsp"&gt;响应流对象&lt;/param&gt;
    /// &lt;param name="encoding"&gt;编码方式&lt;/param&gt;
    /// &lt;returns&gt;响应文本&lt;/returns&gt;
    static string GetResponseAsString(HttpWebResponse rsp, Encoding encoding)
    {
        System.IO.Stream stream = null;
        StreamReader reader = null;
        try
        {
            // 以字符流的方式读取HTTP响应
            stream = rsp.GetResponseStream();
            reader = new StreamReader(stream, encoding);
            return reader.ReadToEnd();
        }
        finally
        {
            // 释放资源
            if (reader != null) reader.Close();
            if (stream != null) stream.Close();
            if (rsp != null) rsp.Close();
        }
    }
}

}

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原文地址：https://www.cnblogs.com/sunny3158/p/15307333.html