java-apache http客戶端查詢，涉及作為多部分發布請求的一部分提交文件

Question

我正在嘗試使用最新的Apache HTTP客戶端（v4.x）發送多部分POST請求-文檔提供的示例代碼提供了以下代碼示例（經過了部分修改）以發出POST請求-

        FileBody bin = new FileBody(new File(args[0]));
        StringBody comment = new StringBody("A binary file of some kind");
        MultipartEntity reqEntity = new MultipartEntity();
        reqEntity.addPart("bin", bin);
        reqEntity.addPart("comment", comment);
        httppost.setEntity(reqEntity);

我感到困惑的是，如果要添加多個文件，則在代碼中

   reqEntity.addPart("bin", bin);

第一個字符串代表什么？ 是作為多部分過帳的一部分發送的文件的名稱嗎？

Answer 1

多部分表單請求可以包含多個部分，每個部分都有一個名稱（類似於常規表單請求）。 給定名稱，該名稱可在服務器端用於檢索特定部分。 RFC 2388中提供了詳細信息：

3. Definition of multipart/form-data

       The media-type multipart/form-data follows the rules of all multipart
       MIME data streams as outlined in [RFC 2046].  In forms, there are a
       series of fields to be supplied by the user who fills out the form.
       Each field has a name. Within a given form, the names are unique.

       "multipart/form-data" contains a series of parts. Each part is
       expected to contain a content-disposition header [RFC 2183] where the
       disposition type is "form-data", and where the disposition contains
       an (additional) parameter of "name", where the value of that
       parameter is the original field name in the form. For example, a part
       might contain a header:

            Content-Disposition: form-data; name="user"