如何使用Multipart发布数据？

Question

我开发了一个应用程序。在我的应用程序中，我从相机或画廊拍摄一张图像。我想使用多部分发布图像到服务器，但图像不发布它。我的帖子数据如下

{
     "suggested_item" :{
         "name": "apple",
         "description" : "nice apple", 
         "image": "image.png"
     }
  }

public void onActivityResult(int requestCode, int resultCode, Intent data) {

if (requestCode == PICK_FROM_CAMERA) {
    try{
        if(resultCode == -1){
            File file = new File(Environment.getExternalStorageDirectory()+File.separator +"image.png");
            bitmap = loadBitmap(file);
            iv_pic.setImageBitmap(bitmap);

        try {
            Uri tempUri = getImageUri(getActivity(), bitmap);
            Log.i(TAG,"onActivityResult PICK_FROM_CAMERA, tempUri : "+tempUri);

        //uploadFile(tempUri + "" + System.currentTimeMillis()+".png");
        } catch (Exception e) {
        e.printStackTrace();
        }
        }else{
        //setResult(RESULT_CANCELED);
        //Activity.this.finish();
        }
    }catch(Exception e){
        e.printStackTrace();
    }
}else if (requestCode == PICK_FROM_GALLERY) {
        try{
           //Log.i(TAG,"onActivityResult PICK_FROM_GALLERY, data : "+data);
            if(data !=null){
                bitmap = null;
                try {
                    bitmap = new BitmapDrawable(MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), data.getData())).getBitmap();
                    iv_pic.setImageBitmap(bitmap);

                    try {
                        Uri tempUri = getImageUri(getActivity(), bitmap);
                        Log.i(TAG,"onActivityResult PICK_FROM_GALLERY, tempUri : "+tempUri);

                        //uploadFile(tempUri + "" + System.currentTimeMillis()+".png");
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }else{
                //setResult(RESULT_CANCELED);
                //Activity.this.finish();
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

public Uri getImageUri(Context context , Bitmap bitmap) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG , 100 , bytes);
    String path = Images.Media.insertImage(context.getContentResolver() , bitmap , "Title" , null);
    return Uri.parse(path);
}

Answer 1

要发送二进制数据，需要使用MultiPartEntityBuilder的addBinaryBody方法。附件示例：

import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
//Image attaching
MultipartEntityBuilder multipartEntity = MultipartEntityBuilder.create();
File file;
multipartEntity.addBinaryBody("someName", file, ContentType.create("image/jpeg"), file.getName());
//Json string attaching
String json;
multipartEntity.addPart("someName", new StringBody(json, ContentType.TEXT_PLAIN));

然后像往常一样提出请求：

HttpPut put = new HttpPut("url");
put.setEntity(multipartEntity.build());
HttpResponse response = client.execute(put);
int statusCode = response.getStatusLine().getStatusCode();