Question

我已经放了一个网址

private static String url = "http://10.50.101.27:8090/AndroidApp/downloads/result.json";

并尝试在android中使用json解析器进行解析，但它无法正常工作。

我的Json格式如下：

{"userdetails":[{"address":"Thrissur","name":"Pramoj","userid":"user001"},{"address":"Trivandrum","name":"Santhosh","userid":"user002"}]}

我该如何解析。 json解析没有响应。请帮帮我。

Answer 1

试试这个：

JSONObject jObject = new JSONObject(response);
JSONArray jArray = jObject.getJSONArray("userdetails");
for (i = 0; i < jArray.length();i++){
  JSONObject oneObject = jArray.getJSONObject(i);
  oneObject.getString("address");//return the address
  oneObject.getString("name");//return the name
  oneObject.getString("userid");//return the userId
}

Answer 2

首先将response string从server转换为 JSONObject since its structure is a JSONObject.然后从JSONArray userdetails获取JSONObject }。通过该数组循环，并在每个位置获取JSONObject's。然后获得strings(address,name,userid)

所需的JSONObject.

示例代码段如下..

JSONObject obj = new JSONObject(response);

JSONArray jArr = obj.getJSONArray("userdetails");

for(int i=0; i < jArr.length(); i++)
{
      JSONObject jObj = jArr.getJSONObject(i);

      Log.v("address",jObj.getString("address").trim());

      Log.v("name",jObj.getString("name").trim());

      Log.v("userid",jObj.getString("userid").trim());
}

Answer 3

public void parseJson(String jsonString)
{
    try
    {
        JSONObject json = new JSONObject(jsonString);
        JSONArray userdetails = json.getJSONArray("userdetails");
        for (int i=0; i<userdetails.length(); i++)
        {
            JSONObject user = userdetails.getJSONObject(i);
            String address = user.getString("address");
            String name = user.getString("name");
            String userid = user.getString("userid");
        }
    }
    catch (Exception e) {}
}

Answer 4

JSONParser类：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class JSONParser {

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

    // constructor
    public JSONParser() {

    }

    public JSONObject getJSONFromUrl(String url) {

        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);

            HttpResponse httpResponse = httpClient.execute(httpPost);
            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 parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;

    }
}

解析代码：

JSONParser jParser = new JSONParser();

// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);

try {
    // Getting Array of userdetails
    userdetails = json.getJSONArray("userdetails");

    // looping through All userdetails
    for(int i = 0; i < userdetails.length(); i++){
        JSONObject c = userdetails.getJSONObject(i);

        // Storing each json item in variable
        String id = c.getString("userid");
        String name = c.getString("name");
        String address = c.getString(address);
    }
} catch (JSONException e) {
    e.printStackTrace();

Answer 5

url =“你的json网址”

    public class Uploadfilechecking extends AsyncTask<String, String, String> {
    Activity mcontext;
    String username, password;
    boolean checkbox_value;

    private ProgressDialog progressDialog;
    private String JSONResp;
    StringBuilder sb = new StringBuilder();
    String Success_msg;

    private JSONArray tmp;

    private View progressView;
    private Object fileUploadManager;
    protected WeakReference<Context> context;

    @Override
    protected String doInBackground(String... params) {
        // TODO Auto-generated method stub

        try {

            URL u = new URL(url);

            HttpURLConnection conn = (HttpURLConnection) u.openConnection();
            conn.setRequestMethod("GET");

            conn.connect();
            InputStream is = conn.getInputStream();

            // Read the stream
            byte[] b = new byte[1024];
            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            while (is.read(b) != -1)
                baos.write(b);

            JSONResp = new String(baos.toByteArray());

        } catch (Throwable t) {
            t.printStackTrace();
        }

        return JSONResp;
    }

    @Override
    protected void onPostExecute(String result) {
        System.out.println("filecheckresult" + result);
        try {

            JSONObject obj = new JSONObject(result);
            JSONArray array=obj.getJSONArray("userdetails");


               for (int i = 0; i < array.length(); i++) {
                   JSONObject actor = array.getJSONObject(i);
                   System.out.println(actor.getString("address"));
            }


        }catch(JSONException ex)
        {
            ex.printStackTrace();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

}

Answer 6

JSONObject jObj = new JSONObject(response);
JSONArray arr = jObj.getJSONArray("userdetails");
for (int i = 0; i < arr .length();i++){
 JSONObject innerobject = arr .getJSONObject(i);
innerobject.getString("address");
innerobject.getString("name");
innerobject.getString("userid");
}

Answer 7

为userdetails创建类和getter / setter

    public class userdetails {
      private String name, address, userid;
    }

创建接收器类

      public class Sink {
          List<userdetails> userdetails;
      }

将该响应称为接收

   List<userdetails>user_details= new ArrayList<userdetails>();
   SinkItem datas = new Gson().fromJson(response, SinkItem.class);
     user_details= datas.userdetails;

将Gson库导入libs文件夹

Android json解析不起作用

7 个答案: