C#从http上返回JSON数据

我们现在先在浏览器访问一下，看到下面返回的结果：

接下来就是大家最喜欢的写代码环节，为了方便演示，我们这里用winform程序。非常简单，我们新建一个窗体程序，点击后，弹出JSON数据即可。界面如下：

建好窗体，放一个按钮，然后我们来创建一个类HttpUitls。这个是这个文章中最重要的。

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;
        }
    
    }
}

这个类有两个方法，一个是Get，一个是Post，本篇文章我们只需要用到Get就可以了。

然后是点击按钮的方法

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)
        {
            //我们的接口
            string url = "http://www.kuaidi100.com/query?type=shunfeng&postid=367847964498";

            //将接口传入，这个HttpUitls的类，有兴趣可以研究下，也可以直接用就可以，不用管如何实现。
            string getJson = HttpUitls.Get(url);

            MessageBox.Show(getJson);
        }
    }
}

 然后是运行结果

到这一步说明我们已经成功拿到接口给我们返回的JSON数据了。那么我们会在下一篇文章中讲解如何使用这JSON数据，也就是解析JSON