有谁用WebClient(Upload)或WebRequest(Post)成功调用过J2ee的Servlet吗？

Question

用Upload或POST两种方式调用时，Servlet端的doPost方法中没有任何反应。但用Download或GET方式时，servlet的doGet方法倒是可以被执行。什么原因呢？难道是人品问题O(∩_∩)O

 

 

=== 新添加内容   编辑者 小鱼o∩o @ 2008年10月10日 上午 1:34 UTC===

 

我在aspx中用同步方式UploadString就没问题了！可在silverlight中不支持同步调用呀？

 

Code Snippet

String content = "a=a";
Uri endPoint = new Uri("http://localhost:8080/RESTProxyWeb/Test");

WebClient client = new WebClient();
client.UploadStringCompleted += new UploadStringCompletedEventHandler(client_UploadStringCompleted);
client.UploadStringAsync(endPoint, content);

 

 

void client_UploadStringCompleted(object sender, UploadStringCompletedEventArgs e)
{
    if (e.Error == null)
    {
 Debug.WriteLine("upResult="+e.Result);
    }
}

 

 

Code Snippet

String content = "a=a";
Uri endPoint = new Uri("http://localhost:8080/RESTProxyWeb/Test");

 

WebRequest request = WebRequest.Create(endPoint);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.BeginGetRequestStream(new AsyncCallback(RequestReady), request);

 

 

//RequestDelegate

private void RequestReady(IAsyncResult asyncResult)
{
 WebRequest request = asyncResult.AsyncState as WebRequest;
 Stream requestStream = request.EndGetRequestStream(asyncResult);
 requestStream.Write(Encoding.UTF8.GetBytes(content),0,content.Length);
 requestStream.Close();
 request.BeginGetResponse(new AsyncCallback(ResponseReady), request);
}

 

//ResponseDelegate
void ResponseReady(IAsyncResult asyncResult)
{
 WebRequest request = asyncResult.AsyncState as WebRequest;
 WebResponse response = request.EndGetResponse(asyncResult);

 using (Stream responseStream = response.GetResponseStream())
 {
 if (responseStream != null)
     Debug.WriteLine("Result=" + new StreamReader(responseStream).ReadToEnd());

 }
}

 

 

Answer 1

 

应当是能够实现的，你先别用异步试试，明天单位有环境，可以去测试一下。

 

Answer 2

孟宪会 写:

应当是能够实现的，你先别用异步试试，明天单位有环境，可以去测试一下。

 

如果没记错，silverlight了的WebClient和WebRequest好像只能用异步的方式吧？

Answer 3

Code Snippet

呵呵，我看错了，还以为是通用的.NET了

经过测试，是完全可以的，serverlet可以接收到数据。

但在返回到界面时，可能会遇到些问题。
完整测试代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Text;
using System.IO;
using System.Diagnostics;

namespace SilverlightApplication2
{
    public partial class Page : UserControl
    {
        public Page()
        {
            InitializeComponent();
        }

        String content = "a=asdsdsd";
        private void Button_Click(object sender, RoutedEventArgs e)
        {

            Uri endPoint = new Uri("http://xxxxx/admin", UriKind.Absolute);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(endPoint);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.BeginGetRequestStream(new AsyncCallback(RequestReady), request);

        }

        private void RequestReady(IAsyncResult asyncResult)
        {
            HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
            StreamWriter sw = new StreamWriter(request.EndGetRequestStream(asyncResult));
            //Stream requestStream = request.EndGetRequestStream(asyncResult);
            //requestStream.Write(Encoding.UTF8.GetBytes(content), 0, content.Length);
            //requestStream.Close();
            sw.Write(content);
            sw.Close();
            request.BeginGetResponse(new AsyncCallback(ResponseReady), request);
        }



        //ResponseDelegate
        void ResponseReady(IAsyncResult asyncResult)
        {
            HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
            HttpWebResponse response = request.EndGetResponse(asyncResult) as HttpWebResponse;

            Stream responseStream = response.GetResponseStream();
            content3.Text = new StreamReader(responseStream).ReadToEnd();
            Debug.WriteLine("Result=" + new StreamReader(responseStream).ReadToEnd());


        }

    }
}

Answer 4

Code Snippet

下面的代码搞定了UI的问题，居然还需要加 SynchronizationContext

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.Threading;

namespace SilverlightApplication2
{
    public partial class Page : UserControl
    {
        public Page()
        {
            InitializeComponent();
            syncContext = SynchronizationContext.Current;
        }

        SynchronizationContext syncContext;
        String content = "a=asdsdsd";
        private void Button_Click(object sender, RoutedEventArgs e)
        {

            Uri endPoint = new Uri("http://www.jitar.com.cn:8080/Groups/admin", UriKind.Absolute);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(endPoint);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.BeginGetRequestStream(new AsyncCallback(RequestReady), request);

        }

        private void RequestReady(IAsyncResult asyncResult)
        {
            HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
            StreamWriter sw = new StreamWriter(request.EndGetRequestStream(asyncResult));
            //Stream requestStream = request.EndGetRequestStream(asyncResult);
            //requestStream.Write(Encoding.UTF8.GetBytes(content), 0, content.Length);
            //requestStream.Close();
            sw.Write(content);
            sw.Close();
            request.BeginGetResponse(new AsyncCallback(ResponseReady), request);
        }



        //ResponseDelegate
        void ResponseReady(IAsyncResult asyncResult)
        {
            HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
            HttpWebResponse response = request.EndGetResponse(asyncResult) as HttpWebResponse;
            syncContext.Post(ExtractResponse, response);

        }
        private void ExtractResponse(object state)
        {

            HttpWebResponse response = state as HttpWebResponse;

            Stream responseStream = response.GetResponseStream();
            content3.Text = new StreamReader(responseStream).ReadToEnd();
            Debug.WriteLine("Result=" + new StreamReader(responseStream).ReadToEnd());

        }


    }
}

Answer 5

 

问题解决了。原来是策略文件的问题。我的策略文件在line4中缺少http-request-headers="*"属性，导致GET可以而POST不行。faint。。。。。。。。。。。。。。。。。

 

Code Snippet

 

1<access-policy>
2  <cross-domain-access>
3    <policy>
4      <allow-from http-request-headers="*">
5        <domain uri="*"/>
6      </allow-from>
7      <grant-to>
8        <resource path="/" include-subpaths="true"/>
9      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>

 

 

 

我太粗心啦！！！！！！大家要引以为戒，