Question

我的backendcode即node.js正常运行我已经通过使用postman以json格式发送一些数据来检查它们并且它们存储在我的db（mongodb）中，现在我想从edittextfield android获取数据并发送它我写的代码是命中服务器，但我没有得到数据。我已经检查了console.log（req）它没有包含我发送的数据我之前看到过与之相关的帖子，但它并没有帮助我

这里是android代码

          private static String url_create_product =   
                                   "http://192.168.1.3:3000/contactlist"; 

          protected String doInBackground(String... args) {
            String name = inputFullName.getText().toString();
            String email = inputEmail.getText().toString();
            String password = inputPassword.getText().toString();

            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("name", name));
            params.add(new BasicNameValuePair("email", email));
            params.add(new BasicNameValuePair("password", password));


            Log.d("params",params.toString());

            JSONObject json = jsonParser.makeHttpRequest(url_create_product,
                    "POST", params);


            Log.d("Create Response", json.toString());

            // check for success tag
            try {
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {

                    Intent i = new Intent(getApplicationContext(), 
                     MainActivity.class);
                    startActivity(i);


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

            return null;

        }

这里是node.js代码

       app.post('/contactlist', function (req, res) {
         console.log("i am going to insert");
        console.log(req);
        console.log(req.body);
        console.log(req.query);
        console.log(req.params);

          db.users.insert(req.body, function(err, doc) {
                                          res.json(doc);
               console.log(doc)
           });
      });

这是错误 the errors that i am getting

makehttprequest方法代码是 public JSONObject makeHttpRequest（String url，String method，列表参数）{

    try {// check for request method
        if(method == "POST"){
            // request method is POST
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(new UrlEncodedFormEntity(params));
            httpPost.setHeader("Accept", "application/json");
            httpPost.setHeader("Content-type", "application/json");
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();

        }else if(method == "GET"){
            // request method is GET
            DefaultHttpClient httpClient = new DefaultHttpClient();
            String paramString = URLEncodedUtils.format(params, "utf-8");
            url += "?" + paramString;
            HttpGet httpGet = new HttpGet(url);

            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        }

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

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        is.close();
        json = sb.toString();
    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }
     try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        Log.e("JSON Parser", "Error parsing data " + e.toString());
    }

    // return JSON String
    return jObj;

}

服务器错误

    Error: invalid json
    at parse (E:\app10 - Copy\node_modules\body-     parser\lib\types\json.js:79:15)
     at E:\app10 - Copy\node_modules\body-parser\lib\read.js:102:18
at done (E:\app10 - Copy\node_modules\body-parser\node_modules\raw-body\index.js:248:14)
at IncomingMessage.onEnd (E:\app10 - Copy\node_modules\body-parser\node_modules\raw-body\index.js:294:7)
at IncomingMessage.g (events.js:180:16)
at IncomingMessage.EventEmitter.emit (events.js:92:17)
at _stream_readable.js:920:16
at process._tickCallback (node.js:415:13)

android错误

    7292-7312/com.example.malli.login2 E/Surface﹕ getSlotFromBufferLocked: unknown buffer: 0xb9ac4360
     7292-8793/com.example.malli.login2 E/JSON Parser﹕ Error parsing data org.json.JSONException: Value Error of type java.lang.String cannot be converted to JSONObject

Answer 1

试试这个

 JSONObject params= new JSONObject();

    try {
        params.put("name", name);     
        params.put("email", email); 
        params.put("password", password);

        HttpPost httpost = new HttpPost(url);

        httpost.setEntity(new StringEntity(params.toString()));
        httpost.setHeader("Accept", "application/json");
        httpost.setHeader("Content-type", "application/json");

        Toast.makeText(this, params.toString(), Toast.LENGTH_LONG).show();

    } catch (JSONException e) {
        e.printStackTrace();
        Toast.makeText(this, "Error", Toast.LENGTH_LONG).show();
    } 

//Other code

服务器上console.log(req.body);的输出是什么？

将edittextfield的数据从android发送到node.js

1 个答案: