我错过了发送http部分帖子请求的内容 [英] What did I miss to send a http part post request
问题描述
我正在尝试使用http多部分请求发送图像（稍后我将添加另一个图像）
I am trying to send an image using http multipart request (later I will add another image)
我这样做了：
HttpClient client = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost(
"http://localhost:8080/ServletExample1/multipart1");
httpPost.addHeader("Content-Type",
"multipart/related; boundary=HereItGoes");
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
FileBody bin = new FileBody(new File("./test.txt"));
builder.addPart("bin", bin);
HttpEntity entity = builder.build();
httpPost.setEntity(entity);
HttpResponse response = client.execute(httpPost);
String responseString = new BasicResponseHandler()
.handleResponse(response);
System.out.println(responseString);
在服务器上，我打印部件数量，使用这个：
on the server, I print the number of parts, using this:
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
if (ServletFileUpload.isMultipartContent(request)) {
Iterator<Part> partsIterator = request.getParts().iterator();
System.out.println("The number of parts is :" + request.getParts().size());
，答案总是零，我做了什么错误？
and the answer is always zero, what mistake did i do ?
作为@Jon Skeet，我在添加文件之前创建了请求。现在我重新排序了代码，我把执行作为最后一行，我仍然得到同样的东西，在服务器上的零件数量仍为零
as @Jon Skeet, I was creating the request before adding the file. Now I reordered the code in which I put the execute as the last line, and I still get the same thing, on the server the number of parts, is still zero
推荐答案
看看你何时打电话给执行 - 那是在你建立之前请求正确！只需重新排序您的代码，以便您完全构建请求，然后您发布它以获得响应，然后您使用响应。 （如果在文件构造函数中使用URL，我个人也会感到惊讶，但也许那里有一些时髦的东西...通常文件指的是本地文件系统文件......）
Look at when you're calling execute - that's before you build the request properly! Just reorder your code so that you fully build the request, then you post it to get a response, then you use the response. (I'd also be personally surprised if using a URL in a File constructor worked, but maybe there's something funky going on there... normally File refers to a local filesystem file...)
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