从androidclient到Djangos的照片

Question

我用JSON对象从Android向Django服务器发出POST请求。如果我只发送字符串，但当我尝试发送照片时，我得到一个FileNotFoundException。在

我将位图编码为Base64，通过JSON发送，然后在Django端再次解码。如果我从网站上传一张照片也可以。唯一不起作用的时候是当我从Android客户端发送POST请求时。在

Django模型

 photo = models.ImageField(upload_to="media/", null=True, blank=True, default=None)

Django视图（Django Rest框架）

^{pr2}$

Android Base64编码

public String convert_bitmap_to_string(Bitmap bitmap){
        ByteArrayOutputStream _stream = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, full_stream);
        bitmap.recycle();
        byte[] full_bytes = full_stream.toByteArray();
        String Str_image = Base64.encodeToString(full_bytes, Base64.DEFAULT);

        return Str_image;
}

Android代码

        HttpURLConnection conn = null;
        BufferedReader reader = null;

        //Genymotion Ip Address 10.0.3.2
        String postUrl = "http://10.0.3.2:8000/dishes/";

        try {
            URL url = new URL(postUrl);

            String basicAuth = "Basic " + Base64.encodeToString("username:password".getBytes(), Base64.NO_WRAP); //i use real username+password
            String boundary = "-------------" + System.currentTimeMillis();

            JSONObject jsonParam = new JSONObject();
            jsonParam.put("name", dishName);
            jsonParam.put("price", dishPrice);
            jsonParam.put("type", dishType);
            jsonParam.put("categoryA", dishCategoryA);
            jsonParam.put("categoryB", dishCategoryB);
            jsonParam.put("description", dishDescription);
            jsonParam.put("photo", convert_bitmap_to_string(bitmap));


            conn = (HttpURLConnection) url.openConnection();
            conn.setUseCaches (false);
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setRequestProperty("ENCTYPE", "multipart/form-data");
            conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
            conn.setRequestProperty ("Authorization", basicAuth);
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("Accept", "application/json");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestMethod("POST");
            conn.connect();

            DataOutputStream wr = new DataOutputStream(conn.getOutputStream ());
            wr.writeBytes (jsonParam.toString());
            wr.flush ();
            wr.close ();

            InputStream is = conn.getInputStream();
            BufferedReader rd = new BufferedReader(new InputStreamReader(is));
            String line;
            StringBuffer response = new StringBuffer();
            while((line = rd.readLine()) != null) {
                response.append(line);
                response.append('\r');
            }
            rd.close();

            return response.toString();


        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (conn != null)
                conn.disconnect();
        }
        // return Contents
        return null;

这是创建的JSON：

{"name":"dish_name","price":22,"type":1,"categoryA":1,"categoryB":1,"description":"description","photo":"iVBORw0KGgoAAAANSUhEUgAAAoAAAAHgCAIAAAC6s0uzAAAAA3NCSVQICAjb4U\/gAAAgAElEQVR4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\ncu5ZuWliv7XqzGxL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堆栈跟踪

W/System.err: java.io.FileNotFoundException: http://10.0.3.2:8000/dishes/
W/System.err:     at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:197)
W/System.err:     at gr.teiscm.msc.restaurantapp.AddDish$PostJsonTask.doInBackground(AddDish.java:250)
W/System.err:     at gr.teiscm.msc.restaurantapp.AddDish$PostJsonTask.doInBackground(AddDish.java:191)
W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:288)
W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
W/System.err:     at java.lang.Thread.run(Thread.java:818)

异常

e = {FileNotFoundException@4240} "java.io.FileNotFoundException: http://10.0.3.2:8000/dishes/"
 cause = {FileNotFoundException@4240} "java.io.FileNotFoundException: http://10.0.3.2:8000/dishes/"
 detailMessage = "http://10.0.3.2:8000/dishes/"
 stackState = {Object[10]@4245} 
 stackTrace = {StackTraceElement[0]@4246} 
 suppressedExceptions = {Collections$EmptyList@4247}  size = 0
 shadow$_klass_ = {Class@1187} "class java.io.FileNotFoundException"
 shadow$_monitor_ = -1346740262

如果我只是评论一下这句话，它就行了：

//jsonParam.put("photo", convert_bitmap_to_string(bitmap));

提前谢谢。抱歉给你发了这么大的帖子。在