在Android中使用MultipartEntityBuilder时HttpPost返回错误

Question

我正在尝试查询这个网址的API：http://www.idmypill.com/api/id/，但是我收到的JSON字符串是 {"results":[],"success":false,"errors":null}。这是我的服务处理类：

public String makeServiceCall(String url, int method, 
        String api, byte[] pillImage) 
{
    try {
        // http client
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpEntity httpEntity = null;
        HttpResponse httpResponse = null;


        // Checking http request method type
         if (method == POST) 
        {
            android.os.Debug.waitForDebugger();
            HttpPost httpPost = new HttpPost(url);

            httpPost.setHeader("data = api_key", api); 
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.addBinaryBody("files = image", pillImage); 
            entity = builder.build();
            Log.d("Entity", entity.toString()); 

            httpPost.setEntity(entity);
            Log.d("post", httpPost.toString()); 
            httpResponse = httpClient.execute(httpPost);

            Log.d("params", httpResponse.getParams().toString()); 

        } 

        httpEntity = httpResponse.getEntity();
        response = EntityUtils.toString(httpEntity);

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return response;

}

网站提供的Python示例是：

# highly suggested to use the requests package
# http://www.python-requests.org/en/latest/
import requests

# read in the image and construct the payload
image = open("example.jpg").read()
data = {"api_key": "KH8hdoai0wrjB0LyeA3EMu5n4icwyOQo"}
files = {"image": open("example.jpg")}

# fire off the request
r = requests.post("http://www.idmypill.com/api/id/",
    data = data,
    files = files)

# contents will be returned as a JSON string
print r.content

我觉得我发送的数据格式可能有问题，或者他们可能特别想要一个.jpg格式的图片，而不是字节数组。我对Python不太熟悉，这个问题我已经纠结了一周多了，所以任何帮助都非常感谢。

Answer 1

试试这个：

 ...
 MultipartEntityBuilder builder = MultipartEntityBuilder.create();
 builder.addTextBody("api_key", api);
 builder.addPart("image", pillImage); 
 ...

如果 addPart 不能处理字节数组（我现在在工作，没法测试），那么你可以用图片文件的名字来做这个，肯定能成功：

 ...
 pillImage = "/path/to/the/image.jpg";  //This is the image file name
 MultipartEntityBuilder builder = MultipartEntityBuilder.create();
 builder.addTextBody("api_key", api);
 File imageFile = new File(pillImage);  //Open the image
 builder.addPart("image", imageFile); 
 ...

Answer 2

用下面这行代码代替直接在addPart中使用文件对象：

builder.addPart("file", new FileBody(new File(filename)));