android upload an image via http

Question

I'm trying to upload an image file (jpeg) to my test server using the method posted here a while ago:

                  try {
         String pathToOurFile = path;
         FileInputStream fileInputStream = 
         new FileInputStream(new File(pathToOurFile) );

         BufferedInputStream bis = new BufferedInputStream(fileInputStream,3000);
         byte[] bt=new byte[bis.available()];

        HttpURLConnection connection = 
        (HttpURLConnection)new  URL(string).openConnection();
         connection.setDoOutput(true);
         connection.setRequestMethod("POST");
         connection.connect();

        FileOutputStream input =  (FileOutputStream) connection.getOutputStream();
        input.write(bt);
        bis.close();

    } catch (MalformedURLException e) {
        Context context = null;

        Toast.makeText(context, "error in writing", Toast.LENGTH_LONG).show();

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

        e.printStackTrace();
    }

    }

I'm getting an ClassCastException at this line: FileOutputStream input = (FileOutputStream) connection.getOutputStream(); thought Eclipse doesnt mark it as an error. How can I fix that?

PS the project is compiled against API lvl 17

Answer 1

The stream returned by getOutputStream() is not a FileOutputStream , so your cast is failing. Eclipse is not warning because by doing the cast, you are telling it that you know that the result will be a FileOutputStream .

Just change the variable type to OutputStream and remove the cast.

Answer 2

只需将FileOutputStream更改为OutputStream