java 获取 POST 的 JSON 响应

Get jSON Response for POST

提问by onkar

I am trying to send a Request using this code

我正在尝试使用此代码发送请求

protected void Authenticate(String mUsername, String mPassword)
    { 
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://192.168.2.5:8000/mobile/");

        try {
            // Add your data
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("username", mUsername));
            nameValuePairs.add(new BasicNameValuePair("password", mPassword));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request
            HttpResponse response = httpclient.execute(httppost);
            System.out.println("this is the response "+response);
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            System.out.println("CPE"+e);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            System.out.println("IOE"+e);
        }
    }

I am getting a HttpResponse, Is the way I am trying to implement correct ? If yes, How do I convert that response to jSON ?

我得到一个HttpResponse，我尝试实施的方式是否正确？如果是，我如何将该响应转换为 jSON ？

LOG-CAT

LOG-CAT

this is the response org.apache.http.message.BasicHttpResponse@2fb67110

回答by Naveen

String jsonString = EntityUtils.toString(response.getEntity());

String jsonString = EntityUtils.toString(response.getEntity());

This is what you need

这就是你所需要的

回答by Vishal Vijay

This will help you:

这将帮助您：

public class JSONParser {

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}

// function get json from url
// by making HTTP POST or GET method
public JSONObject makeHttpRequest(String url, String method,
        List<NameValuePair> params) throws Exception {

    // Making HTTP request
    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));

            // new
            HttpParams httpParameters = httpPost.getParams();
            // Set the timeout in milliseconds until a connection is
            // established.
            int timeoutConnection = 10000;
            HttpConnectionParams.setConnectionTimeout(httpParameters,
                    timeoutConnection);
            // Set the default socket timeout (SO_TIMEOUT)
            // in milliseconds which is the timeout for waiting for data.
            int timeoutSocket = 10000;
            HttpConnectionParams
                    .setSoTimeout(httpParameters, timeoutSocket);
            // new
            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);
            // new
            HttpParams httpParameters = httpGet.getParams();
            // Set the timeout in milliseconds until a connection is
            // established.
            int timeoutConnection = 10000;
            HttpConnectionParams.setConnectionTimeout(httpParameters,
                    timeoutConnection);
            // Set the default socket timeout (SO_TIMEOUT)
            // in milliseconds which is the timeout for waiting for data.
            int timeoutSocket = 10000;
            HttpConnectionParams
                    .setSoTimeout(httpParameters, timeoutSocket);
            // new
            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();
        }

    } catch (UnsupportedEncodingException e) {
        throw new Exception("Unsupported encoding error.");
    } catch (ClientProtocolException e) {
        throw new Exception("Client protocol error.");
    } catch (SocketTimeoutException e) {
        throw new Exception("Sorry, socket timeout.");
    } catch (ConnectTimeoutException e) {
        throw new Exception("Sorry, connection timeout.");
    } catch (IOException e) {
        throw new Exception("I/O error(May be server down).");
    }
    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) {
        throw new Exception(e.getMessage());
    }

    // try parse the string to a JSON object
    try {
        jObj = new JSONObject(json);
    } catch (JSONException e) {
        throw new Exception(e.getMessage());
    }

    // return JSON String
    return jObj;

}
 }

You can use the above class like this: eg:

您可以像这样使用上面的类：例如：

public class GetName extends AsyncTask<String, String, String> {
String imei = "abc";
JSONParser jsonParser = new JSONParser();

@Override
protected void onPreExecute() {
    super.onPreExecute();
}

protected String doInBackground(String... args) {
    String name = null;
    String URL = "http://192.168.2.5:8000/mobile/";
    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("username", mUsername));
    params.add(new BasicNameValuePair("password", mPassword));
    JSONObject json;
    try {
        json = jsonParser.makeHttpRequest(URL, "POST", params);
        try {
            int success = json.getInt(Settings.SUCCESS);
            if (success == 1) {
                name = json.getString("name");
            } else {
                name = null;
            }
        } catch (JSONException e) {
            name = null;
        }
    } catch (Exception e1) {
    }
    return name;
}

protected void onPostExecute(String name) {
    Toast.makeText(mcontext, name, Toast.LENGTH_SHORT).show();
 }
 }

How to use it:
Just create new JSONParse class by copying about class code. Then you can call it any where in your application as shown in second code.

如何使用它：
只需通过复制类代码来创建新的 JSONParse 类。然后您可以在应用程序中的任何位置调用它，如第二个代码所示。

回答by DjHacktorReborn

Here what you need to do

在这里你需要做什么

  HttpResponse mHttpResponse = mHttpClient.execute(httppost);
                StatusLine status = mHttpResponse.getStatusLine();
                int response = status.getStatusCode();

回答by Subir Kumar Sao

Here is an example from the blog. Hope this helps

这是博客中的一个例子。希望这可以帮助

    if (response.getStatusLine().getStatusCode() != 200) {
        throw new RuntimeException("Failed : HTTP error code : "
           + response.getStatusLine().getStatusCode());
    }

    BufferedReader br = new BufferedReader(
                     new InputStreamReader((response.getEntity().getContent())));

    String output;
    System.out.println("Output from Server .... \n");
    while ((output = br.readLine()) != null) {
        System.out.println(output);
    }

    httpClient.getConnectionManager().shutdown();