因为工作需要调用WebService接口,查了下资料,发现添加服务引用可以直接调用websevice
参考地址:https://www.cnblogs.com/peterpc/p/4628441.html
如果不添加服务引用又怎么做呢?于是又去查看怎么根据http协议调用webservice并做了个无参接口测试,如下:
但一做有参的接口调用就提示500错误(远程服务器返回错误(500)内部服务器错误),查了半天资料,大多数都说是ContentType = "application/x-www-form-urlencoded; charset=UTF-8"; 改成ContentType = "text/html";或者在<@Page..%>中设置 ValidateRequest="false" 即可(这里无需修改Content-type)。结果还是报一样的错误。最后再https://www.jb51.net/article/120015.htm中发现参数是要拼接一下的 (param = HttpUtility.UrlEncode(
"param1"
) +
"="
+ HttpUtility.UrlEncode(num1) +
"&"
+ HttpUtility.UrlEncode(
"param2"
) +
"="
+ HttpUtility.UrlEncode(num2);
) ,这样传递int、string类型的参数都没问题。业务要求传递的是图片二进制转化的string类型数据,结果还是报500错误。经过调试对比发现图片二进制数据转化成的string类型数据没有根据url形式传递,而是带有特殊符号的,知道问题所在就好办了,把它转化成有效的url传输数据就行,.net也有现成的封装方法:HttpServerUtility.UrlTokenEncode(bmpBytes),这样500错误也解决了。
测试代码如下:
1 protected void Page_Load(object sender, EventArgs e) 2 { 3 Bitmap bmp = new Bitmap(System.Drawing.Image.FromFile("C:/Users/TYTD/Desktop/测试样本/ch_DJI_279.jpg")); 4 MemoryStream ms = new MemoryStream(); 5 bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); 6 ms.Flush(); 7 //将二进制数据存到byte数组中 8 byte[] bmpBytes1 = ms.ToArray(); 9 bmp.Dispose();10 11 string bmpBytes = HttpUtility.UrlEncode("bmpBytes") + "=" + HttpServerUtility.UrlTokenEncode(bmpBytes1);12 13 string url = "http://192.168.0.28:9800/WebService1.asmx/Send_Image";14 string a = CallServiceByGet1(url, bmpBytes);15 16 }17 public static string CallServiceByGet1(string strURL,string a)18 {19 var result = string.Empty;20 //创建一个HTTP请求21 byte[] byt = Encoding.UTF8.GetBytes(a);22 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);23 request.Method = "POST";24 request.ContentType = "application/x-www-form-urlencoded";25 request.ContentLength = byt.Length;26 27 request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";28 System.IO.Stream outputStream = request.GetRequestStream();29 outputStream.Write(byt, 0, byt.Length);30 outputStream.Close();31 32 HttpWebResponse response;33 Stream responseStream;34 StreamReader reader;35 string srcString;36 try37 {38 response = (HttpWebResponse)request.GetResponse();//获取http请求的响应对象39 }40 catch (WebException ex)41 {42 return ex.Message;43 }44 responseStream = response.GetResponseStream();45 reader = new System.IO.StreamReader(responseStream, Encoding.GetEncoding("UTF-8"));46 srcString = reader.ReadToEnd();47 result = srcString; //返回值赋值48 reader.Close();49 50 return result;51 }