实习单位需要测试c#与单位某软件的对接情况，让我负责c#通过HTTP发送POST、GET请求
C# POST、GET请求主要涉及两个类HttpWebRequest和HttpWebResponse，前者用来写入数据，后者用来接收返回数据
代码如下：
POST：
public string putMessage(string message)
{
try
{
string Url = "";//自己指定URL
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = Encoding.UTF8.GetByteCount(message);
Stream myRequestStream = request.GetRequestStream();
StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
myStreamWriter.Write(message);
myStreamWriter.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
return response.Server + " " + response.Method + " " + response.StatusDescription;
}
catch (WebException ex)
{
var error = (HttpWebResponse)ex.Response;
Stream myResponseStream = error.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}
}
由于需求不需要接收POST返回，所以没有读取POST返回的流，如果要读取POST返回的流，参考代码如下
public string putMessage(string message)
{
try
{
string Url = "http://" + IP_PORT + "/cmsp/message?token=" + TOKEN + "&topic=" + TOPIC_NAME;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";// 指定提交数据类型
request.ContentLength = Encoding.UTF8.GetByteCount(message);
Stream myRequestStream = request.GetRequestStream();
StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));
myStreamWriter.Write(message);
myStreamWriter.Close();
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}
catch (WebException ex)
{
var error = (HttpWebResponse)ex.Response;
Stream myResponseStream = error.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}
}
GET：
public string getMessage()
{
try
{
string Url = "";//自己指定URL
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
request.Method = "GET";
request.ContentType = "text/json;charset=UTF-8";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream myResponseStream = response.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}
catch (WebException ex)
{
var error = (HttpWebResponse)ex.Response;
Stream myResponseStream = error.GetResponseStream();
StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
string retString = myStreamReader.ReadToEnd();
myStreamReader.Close();
myResponseStream.Close();
return retString;
}
}
这种catch的写法可以获取报错之后服务器的返回数据，如果服务器返回错误码和错误原因的话这样是能获取到的。