在发布http请求中无法获得http JSON响应

Question

I'm try to receive http response in the folowing code:

public void httpRes (){
try {
    HttpClient client = new DefaultHttpClient();
    String postURL = "http://validate.jsontest.com/";
    HttpPost post = new HttpPost(postURL);
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("user", "kris"));
        params.add(new BasicNameValuePair("pass", "xyz"));
        UrlEncodedFormEntity ent = new UrlEncodedFormEntity(params, HTTP.UTF_8);
        post.setEntity(ent);
        HttpResponse responsePOST = client.execute(post);
        HttpEntity resEntity = responsePOST.getEntity();
        if (resEntity != null) {
            Log.i("RESPONSE",EntityUtils.toString(resEntity));
        }
} catch (Exception e) {
    e.printStackTrace();
}}

Got an error -

LogCat log:

09-12 21:48:58.099: INFO/RESPONSE(28485): {
        "error": "No JSON to validate. Please post JSON to validate via the json parameter.",
        "validate": false
        }

I've tried to receive response from GET requsets - everything was ok, but when i've tried POST request all variety of POST code - I can't get an answer! What is the problem? need help.

I've also tried:

Map<String, String> comment = new HashMap<String, String>();
comment.put("password", "password");
comment.put("avatar", "httpssssssss");

String json = new GsonBuilder().create().toJson(comment, Map.class);
HttpResponse response = makeRequest("http://validate.jsontest.com/", json);
//Log.w(TAG, EntityUtils.toString(response));
try {
    HttpEntity entity = response.getEntity();
    InputStream is = entity.getContent();
    String sss= convertStreamToString(is);
    Log.w("SSSSSSSSSSSSSSSSSS", sss);
} catch (Exception ex) {
    Log.w("Exception exxx", ex);
}
public static HttpResponse makeRequest(String uri, String json) {
        try {
            HttpPost httpPost = new HttpPost(uri);
            httpPost.setEntity(new StringEntity(json));
            httpPost.setHeader("Accept", "application/json");
            httpPost.setHeader("Content-type", "application/json");
            return new DefaultHttpClient().execute(httpPost);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

private static String convertStreamToString(InputStream is) {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append((line + "\n"));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

So, what is the problem?

Answer 1

除非Content-Type标头设置为application/x-www-form-urlencoded否则http://validate.jsontest.com拒绝POST请求。

Answer 2

Via GET your line of code

HttpPost httpPost = new HttpPost(uri);

should be

HttpPost httpPost = new HttpPost(uri+"?json="+json);

and I don't think you need the three lines below that.

Via POST you need to pass the json parameter like so.

params.add(new BasicNameValuePair("json", json));

assuming json is a variable containing your json data.

You can test the GET method in a browser like so http://validate.jsontest.com/?json= {validate: true}

Answer 3

You need to post a valid json to the url http://validate.jsontest.com/ to validate it. What you're doing is basically sending a post request to the url, which is not in json format. You'll have to encode it to json and then send it to the validating url.