android中的多部分请求问题 - 抛出错误的请求答案

【问题标题】：Multipart Request issue in android - Throwing BAD REQUESTandroid中的多部分请求问题 - 抛出错误的请求
【发布时间】：2013-05-15 11:54:53
【问题描述】：

private void CreateaMultiPartRequest() {
   try{
       HttpClient client = new DefaultHttpClient();  
       HttpPost post = new HttpPost("http://172.16.22.232:8080/RESTfulExample/rest/multiPartFileUpload");  
       MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE); 
       post.setHeader("Content-type", "multipart/form-data; boundary="+"~~~~~");
       String Usersettings = "{\"uId\":\"atcc02\", \"bomId\":\"IC014654_12345\", \"fileName\":\"file_12345.pdf\"}";     
       File cfile = new File(receivedUri.getPath());
       reqEntity.addPart("file", new FileBody(cfile,"application/octet")); 
       reqEntity.addPart("settings", new StringBody(Usersettings,"application/json",Charset.forName("UTF-8")));
       post.setEntity(reqEntity); 
       HttpResponse response = client.execute(post);  
       HttpEntity resEntity = response.getEntity();  
            if (resEntity != null)  
                {
                  resEntity.consumeContent();  
                }
                else{                       
                }
            }           
            catch(Exception e)
            {
            }
        }

每当我尝试执行此代码时，我都会从服务器收到“400:BAD REQUEST”。无法在这里找出问题，有人可以帮助我纠正这个问题吗？

【问题讨论】：

你检查过这个stackoverflow.com/questions/11629013/…
是的..我检查了同样的..事实上我也遵循了同样的方法。问题仍然存在
此代码适用于 Android 吗？ MultipartEntity 不是 Android 库的一部分。
你在wireshark中检查你的请求了吗？也许这会有所帮助
您发送的内容有误，根据 400 响应代码描述 The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications。 400 通常会在消息中返回原因是什么。你应该先检查一下...

标签： android multipart multipartentity

【解决方案1】：

您可能为 FileBody 使用了错误的 MIME 类型。改用 application/octet-stream。

要获得正确的 MIME 类型，我使用以下代码：

MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExtension);

看看我用来发出网络请求的小型库：http://code.google.com/p/android-dman/source/browse/trunk/src/org/nkuznetsov/lib/dman/DownloadManager.java

【讨论】：

【解决方案2】：

在这里你可以试试这个，它对我很好。

        HttpClient httpClient = new DefaultHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost httpPost = new HttpPost(url);

        FileBody bin = new FileBody(new File(args[5]));
        long size = bin.getContentLength();

        MultipartEntity reqEntity = new MultipartEntity();
        reqEntity.addPart("image1", bin);
        String content = "";
        try {
             httpPost.setEntity(reqEntity);
                HttpResponse response = httpClient.execute(httpPost, localContext);
                HttpEntity ent = response.getEntity();
                InputStream st = ent.getContent();
                StringWriter writer = new StringWriter();
                IOUtils.copy(st, writer);
                content = writer.toString();                

        } catch (IOException e) {                   

        }

【讨论】：