C#以post方式调用struts rest-plugin service的问题
2020-12-13 13:43
标签：style blog http io color os ar java for struts2: 玩转 rest-plugin 一文中，学习了用struts2开发restful service的方法，发现用c#以post方式调用时各种报错，但java、ajax，包括firefox 的rest client插件测试也无问题。 先给出rest service中的这个方法： 代码不复杂，post一段String过来(xml/json/html格式均可)，自动映射成Order对象的实例model，然后根据请求HttpHeader中的Content-Type，如果是xml(application/xml)，则返回model对应的xml，如果是json(application/json)，则返回model对应的json，其它则返回页面 c#的调用代码： 这二种常用的调用方式，居然全跪了，返回的结果是一堆java异常： ... 无奈百度了一圈，发现还有另一种方法，利用TcpClient调用 总算调用成功了，但是由于java端是用SendRedirect在客户端重定向的，所以该方法得到的返回结果如下： HTTP/1.1 302 Found 是一堆http头的原文，只能曲线救国，将其中的Location:后的部分（即重定向的url），取出来再次get请求，这里还有一个坑，该url返回时，把port弄丢了，正确的重定向url应该是： http://localhost:8080/struts2-rest-ex/rest/orders/230.xml 手动把端口拼上，再次get，总算返回正确了 C#以post方式调用struts rest-plugin service的问题 标签：style blog http io color os ar java for 原文地址：http://www.cnblogs.com/yjmyzz/p/4053784.html
1 // POST /orders
2 public HttpHeaders create() throws IOException, ServletException {
3 ordersService.doSave(model);
4 HttpServletResponse response = ServletActionContext.getResponse();
5 HttpServletRequest request = ServletActionContext.getRequest();
6 String ContentType = request.getHeader("Content-Type").toLowerCase();
7 if (ContentType.startsWith("application/xml")) { // 返回xml视图
8 response.sendRedirect("orders/" + model.getId() + ".xml");
9 } else if (ContentType.startsWith("application/json")) { // 返回json视图
10 response.sendRedirect("orders/" + model.getId() + ".json");
11 } else {// 返回xhtml页面视图
12 response.sendRedirect("orders/");
13 }
14 return null;
15 }
1 static string PostDataByWebClient(String postUrl, String paramData, String mediaType)
2 {
3 String result = String.Empty;
4 try
5 {
6 byte[] postData = Encoding.UTF8.GetBytes(paramData);
7 WebClient webClient = new WebClient();
8 webClient.Headers.Add("Content-Type", mediaType);
9 byte[] responseData = webClient.UploadData(new Uri(postUrl), "POST", postData);
10 result = Encoding.UTF8.GetString(responseData);
11 }
12 catch (Exception e)
13 {
14 Console.WriteLine(e);
15 result = e.Message;
16 }
17 return result;
18 }
19
20 static string PostDataByWebRequest(string postUrl, string paramData, String mediaType)
21 {
22 string result = string.Empty;
23 Stream newStream = null;
24 StreamReader sr = null;
25 HttpWebResponse response = null;
26 try
27 {
28 byte[] byteArray = Encoding.UTF8.GetBytes(paramData);
29 HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));
30 webReq.Method = "POST";
31 webReq.ContentType = mediaType;
32 webReq.ContentLength = byteArray.Length;
33 newStream = webReq.GetRequestStream();
34 newStream.Write(byteArray, 0, byteArray.Length);
35 response = (HttpWebResponse)webReq.GetResponse();
36 sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
37 result = sr.ReadToEnd();
38 }
39 catch (Exception ex)
40 {
41 Console.WriteLine(ex);
42 result = ex.Message;
43 }
44 finally
45 {
46 if (sr != null)
47 {
48 sr.Close();
49 }
50 if (response != null)
51 {
52 response.Close();
53 }
54 if (newStream != null)
55 {
56 newStream.Close();
57 }
58 }
59 return result;
60 }
java.lang.NullPointerException
at org.apache.struts2.convention.ConventionUnknownHandler.handleUnknownActionMethod(ConventionUnknownHandler.java:423)
at com.opensymphony.xwork2.DefaultUnknownHandlerManager.handleUnknownMethod(DefaultUnknownHandlerManager.java:96) 1 static string PostDataByTcpClient(string postUrl, string paramData, String mediaType)
2 {
3 String result = String.Empty;
4 TcpClient clientSocket = null;
5 Stream readStream = null;
6 try
7 {
8 clientSocket = new TcpClient();
9 Uri URI = new Uri(postUrl);
10 clientSocket.Connect(URI.Host, URI.Port);
11 StringBuilder RequestHeaders = new StringBuilder();//用来保存HTML协议头部信息
12 RequestHeaders.AppendFormat("{0} {1} HTTP/1.1\r\n", "POST", URI.PathAndQuery);
13 RequestHeaders.AppendFormat("Connection:close\r\n");
14 RequestHeaders.AppendFormat("Host:{0}\r\n", URI.Host);
15 RequestHeaders.AppendFormat("Content-Type:{0}\r\n",mediaType);
16 RequestHeaders.AppendFormat("\r\n");
17 RequestHeaders.Append(paramData + "\r\n");
18 Encoding encoding = Encoding.UTF8;
19 byte[] request = encoding.GetBytes(RequestHeaders.ToString());
20 clientSocket.Client.Send(request);
21 readStream = clientSocket.GetStream();
22 StreamReader sr = new StreamReader(readStream, Encoding.UTF8);
23 result = sr.ReadToEnd();
24 }
25 catch (Exception e)
26 {
27 Console.WriteLine(e);
28 result = e.Message;
29 }
30 finally
31 {
32 if (readStream != null)
33 {
34 readStream.Close();
35 }
36 if (clientSocket != null)
37 {
38 clientSocket.Close();
39 }
40 }
41 return result;
42 }
Server: Apache-Coyote/1.1
Location: http://localhost/struts2-rest-ex/rest/orders/230.xml
Content-Length: 0
Date: Mon, 27 Oct 2014 03:18:56 GMT
Connection: close
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