在Java Android App中将输入流转换为字符串值

Question

I'm having trouble with function(s) I'm writing. I'm trying to convert an inputstream to a string value. I've written two functions and I'm attempting to extract the String value but my Log.e response is returning NULL. Below is my syntax. What am I doing wrong? Thanks

public JSONArray GetCityDetails(String StateID) {

    @SuppressWarnings("deprecation")
    String url = "http://mywebsite.com/getCity.php?StateID="+URLEncoder.encode(StateID);

    HttpEntity httpEntity = null;

    try{

         DefaultHttpClient httpClient = new DefaultHttpClient();
         HttpGet httpGet = new HttpGet(url);

         HttpResponse httpResponse = httpClient.execute(httpGet);

         httpEntity = httpResponse.getEntity();


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

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


    JSONArray jsonArray = null;
    if(httpEntity !=null){
        try{

            InputStream entityResponse = httpEntity.getContent();
            // not working
            String entityResponseAfterFunctionCall2 = readFully(entityResponse);
            // not working
            String entityResponseAfterFunctionCall3 = letsDoThisAgain(entityResponse);
            Log.e("Entity Response Dude: ", entityResponseAfterFunctionCall3);

            jsonArray = new JSONArray(entityResponseAfterFunctionCall3);

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

    return jsonArray;
}

public String readFully(InputStream entityResponse) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int length = 0;
    while ((length = entityResponse.read(buffer)) != -1) {
        baos.write(buffer, 0, length);
    }
    return baos.toString();
}

public String letsDoThisAgain(InputStream entityResponse){

    InputStreamReader is = new InputStreamReader(entityResponse);
    StringBuilder sb = new StringBuilder();
    BufferedReader br = new BufferedReader(is);
    try {
        String read = br.readLine();

        while(read !=null){
            sb.append(read);
            read = br.readLine();
        }

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

    return sb.toString();   
}

}

Answer 1

if(inputStream != null)
        {
            BufferedReader br = null;
            StringBuilder sb = new StringBuilder();

            String line;
            try {

                br = new BufferedReader(new InputStreamReader(inputStream));
                while ((line = br.readLine()) != null) {
                    sb.append(line);
                }

            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (br != null) {
                    try {
                        br.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }

            return sb.toString();
        }
        else
        {
            return "";
        }

Answer 2

Your readFully call will use your system's default character encoding to transform byte buffer into String. This is NOT what you want to happen.

You should use explicit character set in toString call. The encoding is usually specified in the HTTP request header.

Here is an example of how to convert a UTF-8 encoded string

return baos.toString( "UTF-8" );

Your second problem, is once you've consumed the InputString in readFully call, the letsDoThisAgain will not have anything to read, because the InputStream will be at the EOF.