Retrofit:将一个String List参数添加到Multipart Request

Question

我正在尝试将String列表参数添加到多部分请求中.

使用Apache Http,我设置如下参数:

MultipartEntity mpEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(mpEntity);

for (User member : members) {
    mpEntity.addPart("user_ids[]", new StringBody(member.id.toString()));
}

如何在Retrofit上执行此操作？

Answer 1

看一眼MultipartTypedOutput。我不认为有内置的支持，所以你必须自己构建它或编写一个Convertor.

在您的服务界面：

@POST("/url")
Response uploadUserIds(@Body MultipartTypedOutput listMultipartOutput);

在您的来电者处：

MultipartTypedOutput mto = new MultipartTypedOutput();
for (String userId : userIds){
   mto.addPart("user_ids[]", new TypedString(userId));
}
service.uploadUserIds(mto);

这将构造类似的结果：

    Content-Type: multipart/form-data; boundary=49f201f1-7379-4390-9ea5-97d74e78bb63
    Content-Length: 820
    --49f201f1-7379-4390-9ea5-97d74e78bb63
    Content-Disposition: form-data; name="name"
    Content-Type: text/plain; charset=UTF-8
    Content-Length: 10
    Content-Transfer-Encoding: binary
    yourString
    --49f201f1-7379-4390-9ea5-97d74e78bb63
    Content-Disposition: form-data; name="name"
    Content-Type: text/plain; charset=UTF-8
    Content-Length: 10
    Content-Transfer-Encoding: binary
    yourString
    --49f201f1-7379-4390-9ea5-97d74e78bb63
    Content-Disposition: form-data; name="name"
    Content-Type: text/plain; charset=UTF-8
    Content-Length: 10
    Content-Transfer-Encoding: binary
    yourString
    --49f201f1-7379-4390-9ea5-97d74e78bb63
    Content-Disposition: form-data; name="name"
    Content-Type: text/plain; charset=UTF-8
    Content-Length: 10
    Content-Transfer-Encoding: binary
    yourString
    --49f201f1-7379-4390-9ea5-97d74e78bb63--