如何使用Android的MultipartEntity发送多个字符串变量

Question

我想使用经纬度的MultipartEntity.Values发送图像和经度值，并将其存储在名为plat和plong的单独变量中。我能够将图像发送到服务器，但不能同时发送经纬度。在服务器端，只有Latitude最终插入到数据库中。 Bellow是我用来将文件和字符串发送到服务器的代码。任何人都可以建议我在哪里做错了？

private class UploadTask extends AsyncTask<Bitmap, Void, Void> { 

    protected Void doInBackground(Bitmap... bitmaps) { 
     if (bitmaps[0] == null) 
      return null; 
     setProgress(0); 

     Bitmap bitmap = bitmaps[0]; 
     ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
     bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream); // convert 
                    // Bitmap 
                    // to 
                    // ByteArrayOutputStream 
     InputStream in = new ByteArrayInputStream(stream.toByteArray()); // convert 
                      // ByteArrayOutputStream 
                      // to 
                      // ByteArrayInputStream 

     DefaultHttpClient httpclient = new DefaultHttpClient(); 
     try { 
      HttpPost httppost = new HttpPost(
        "http://www.example.com/index.php"); // server 

      MultipartEntity reqEntity = new MultipartEntity(); 
      reqEntity.addPart("myFile", 
        System.currentTimeMillis() + ".jpg", in); 
      httppost.setEntity(reqEntity); 

      reqEntity.addPart("long",String.valueOf(plong)); 
      reqEntity.addPart("lat",String.valueOf(plat)); 


      Log.e(TAG, "request " + httppost.getRequestLine()); 
      HttpResponse response = null; 
      try { 
       response = httpclient.execute(httppost); 
      } catch (ClientProtocolException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      try { 
       if (response != null) 
        Log.i(TAG, "response " 
          + response.getStatusLine().toString()); 
      } finally { 

      } 
     } finally { 

     } 

     if (in != null) { 
      try { 
       in.close(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
     } 

     if (stream != null) { 
      try { 
       stream.close(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
     } 

     return null; 
    } 

以下是MultipartEntity类中的addPart（）方法。

ByteArrayOutputStream out = new ByteArrayOutputStream(); 

public void addPart(final String key, final String value) { 
    writeFirstBoundaryIfNeeds(); 
    try { 
     out.write(("Content-Disposition: form-data; name=\"" +key+"\"\r\n").getBytes()); 
     out.write("Content-Type: text/plain; charset=UTF-8\r\n".getBytes()); 
     out.write("Content-Transfer-Encoding: 8bit\r\n\r\n".getBytes()); 
     out.write(value.getBytes()); 
     out.write(("\r\n--" + boundary + "\r\n").getBytes()); 
    } catch (final IOException e) { 

    } 
} 

Answer 1

尝试使用此，

reqEntity.addPart("long",new StringBody(plong)); 
reqEntity.addPart("lat",new StringBody(plat)); 
// or plong.toString() and plat.toString() depending on your plong and plat datatype 
//and then add to httppost 
httppost.setEntity(reqEntity); 

发送lattitude和经度。

但是你可以检查此link，好exapmles在这里，可以是真正有助于了解

Answer 2

设置后添加请求的一部分，并添加new StringBody()到String.valueOf()实体：

做到这一点，这可能帮助你： -

MultipartEntity reqEntity = new MultipartEntity(); 
reqEntity.addPart("myFile", 
System.currentTimeMillis() + ".jpg", in); 
reqEntity.addPart("long",new StringBody(String.valueOf(plong))); 
reqEntity.addPart("lat",new StringBody(String.valueOf(plat))); 
httppost.setEntity(reqEntity); 

Answer 3

是@Harsh是对的。你要设置的实体....添加部分数据到multipartentity之前....

更改代码...

 MultipartEntity reqEntity = new MultipartEntity(); 
     reqEntity.addPart("myFile", 
       System.currentTimeMillis() + ".jpg", in); 
     httppost.setEntity(reqEntity); 

     reqEntity.addPart("long",String.valueOf(plong)); 
     reqEntity.addPart("lat",String.valueOf(plat)); 

这个...

 MultipartEntity reqEntity = new MultipartEntity(); 
     reqEntity.addPart("myFile", 
       System.currentTimeMillis() + ".jpg", in); 
     //httppost.setEntity(reqEntity);//remove this line and place after setting all part values 

     reqEntity.addPart("long",new StringBody(plong)); 
     reqEntity.addPart("lat",new StringBody(plat)); 
     httppost.setEntity(reqEntity); //place it here....