通过HTTP访问Web服务时未获得所需的输出

Question

I am trying to convert use a web service to convert celcius to farenheit and not getting the required output. can anyone help me out...here is my code.

        HttpClient httpClient = new DefaultHttpClient(); 
        HttpContext localContext = new BasicHttpContext(); 
        httpClient.getParams().setParameter("Celsius", "32");

        HttpPost httpGet = new HttpPost("http://www.w3schools.com/webservices/tempconvert.asmx"); 
        HttpResponse response = httpClient.execute(httpGet, localContext); 

       tv.setText(response.toString());
    }
    catch (Exception e) {
        tv.setText(e.toString());
    }
}

}

Answer 1

First of all, HttpParams is not a collection of query/GET params. It's used for "HTTP protocol and framework parameters" as the docs put it. So, in case of a GET request, you add query params by either appending "?Celsius=32" to that URL or use the Uri.Builder . For POST request, you have to use the setEntity method. Like in this example ( source ):

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);

// add POST params
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("foo", "123"));
nameValuePairs.add(new BasicNameValuePair("bar", "456"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

HttpResponse response = httpclient.execute(httppost);

Secondly, in order to read the response as a String you need something like this:

HttpResponse response = httpClient.execute(request);
InputStream content = response.getEntity().getContent();
String json = convertStreamToString(content);

// ...

private String convertStreamToString(InputStream input) throws IOException {
    Reader inputReader = new InputStreamReader(input);
    BufferedReader reader = new BufferedReader(inputReader, 8192);
    StringBuilder string = new StringBuilder();
    String line = null;

    try {
      while ((line = reader.readLine()) != null) {
        string.append(line + "\n");
      }
    } finally {
      input.close();
    }

    return string.toString();
}