從Http上返回Json數據

我們現在先在瀏覽器訪問一下，看到下面返回的結果：

接下來就是大家最喜歡的寫代碼環節，為了方便演示，我們這里用winform程序。非常簡單，我們新建一個窗體程序，點擊后，彈出JSON數據即可。界面如下：

建好窗體，放一個按鈕，然后我們來創建一個類HttpUitls。這個是這個文章中最重要的。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;

namespace WindowsFormsApplication1
{
    public class HttpUitls
    {
         public static string Get(string Url)
        {
            //System.GC.Collect();
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.Proxy = null;
            request.KeepAlive = false;
            request.Method = "GET";
            request.ContentType = "application/json; charset=UTF-8";
            request.AutomaticDecompression = DecompressionMethods.GZip;

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();
            myResponseStream.Close();

            if (response != null)
            {
                response.Close();
            }
            if (request != null)
            {
                request.Abort();
            }

            return retString;
        }

        public static string Post(string Url, string Data, string Referer)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.Method = "POST";
            request.Referer = Referer;
            byte[] bytes = Encoding.UTF8.GetBytes(Data);
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = bytes.Length;
            Stream myResponseStream = request.GetRequestStream();
            myResponseStream.Write(bytes, 0, bytes.Length);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader myStreamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();
            myResponseStream.Close();

            if (response != null)
            {
                response.Close();
            }
            if (request != null)
            {
                request.Abort();
            }
            return retString;
        }
    
    }
}

這個類有兩個方法，一個是Get，一個是Post，本篇文章我們只需要用到Get就可以了。

然后是點擊按鈕的方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //我們的接口
            string url = "http://www.kuaidi100.com/query?type=shunfeng&postid=367847964498";

            //將接口傳入，這個HttpUitls的類，有興趣可以研究下，也可以直接用就可以，不用管如何實現。
            string getJson = HttpUitls.Get(url);

            MessageBox.Show(getJson);
        }
    }
}

 然后是運行結果

到這一步說明我們已經成功拿到接口給我們返回的JSON數據了。那么我們會在下一篇文章中講解如何使用這JSON數據，也就是解析JSON