在Winform中发HTTP请求(调用WebService服务)

http://www.cnblogs.com/helimin19/articles/56933.html

手工发送HTTP请求主要是调用System.Net的HttpWebResponse方法

手工发送HTTP的GET请求:

string strURL = "http://localhost/Play/CH1/Service1.asmx/doSearch?keyword=";

strURL +=this.textBox1.Text;

System.Net.HttpWebRequest request;

//创建一个HTTP请求

request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);

//request.Method="get";

System.Net.HttpWebResponse response;

response = (System.Net.HttpWebResponse)request.GetResponse();

System.IO.Stream s;

s = response.GetResponseStream();

XmlTextReader Reader = new XmlTextReader(s);

Reader.MoveToContent();

string strValue = Reader.ReadInnerXml();

strValue = strValue.Replace("<","<");

strValue = strValue.Replace(">",">");

MessageBox.Show(strValue);

Reader.Close();

手工发送HTTP的POST请求

string strURL = "http://localhost/Play/CH1/Service1.asmx/doSearch";

System.Net.HttpWebRequest request;

request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);

//Post请求方式

request.Method="POST";

//内容类型

request.ContentType="application/x-www-form-urlencoded";

//参数经过URL编码

string paraUrlCoded = System.Web.HttpUtility.UrlEncode("keyword");

paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode(this.textBox1.Text);

byte[] payload;

//将URL编码后的字符串转化为字节

payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);

//设置请求的ContentLength

request.ContentLength = payload.Length;

//获得请求流

Stream writer = request.GetRequestStream();

//将请求参数写入流

writer.Write(payload,0,payload.Length);

//关闭请求流

writer.Close();

System.Net.HttpWebResponse response;

//获得响应流

response = (System.Net.HttpWebResponse)request.GetResponse();

System.IO.Stream s;

s = response.GetResponseStream();

XmlTextReader Reader = new XmlTextReader(s);

Reader.MoveToContent();

string strValue = Reader.ReadInnerXml();

strValue = strValue.Replace("<","<");

strValue = strValue.Replace(">",">");

MessageBox.Show(strValue);

Reader.Close();

Get请求与Post请求的主要区别在于Post的参数要经过URL编码并在获得请求之前传送,而Get把参数用URL编码后直接附加到请求的URL后面

URL编码是一种字符编码格式,它确保传递的参数由一致的文本组成(如将空格编码为"%20")