我有这个JSON响应，我需要解析它。我该怎么做。
我有
中的整个jsonJSONObject response = new JSONObject(result);
如何从下面的响应中解析所有JSON数组和字符串。
[{"name":"name1","url":"url1"},{"name":"name2","url":"url2"},...]
我是JSON解析的新手，有人可以写完整个代码。 感谢
答案 0 :(得分：3)
使用以下功能。只需传递您的网址。
private void getData(String url) {
pDialog = new ProgressDialog(this);
pDialog.setMessage(getResources().getString(R.string.app_name));
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
// String url = "http://httpbin.org/html";
Log.d("soh_into_get", url);
jsonArray = new JsonArrayRequest(Request.Method.GET, url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray data) {
try {
Log.d("soh_json", String.valueOf(data));
for (int i = 0; i < data.length(); i++) {
JSONObject jObj = data.getJSONObject(i);
ImagesDataModel pModel = new ImagesDataModel();
pModel.image_id = jObj.getString("image_id");
Log.d("image_id", jObj.getString("image_id"));
JSONArray jsonArray = jObj.getJSONArray("comments");
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject jObj1 = jsonArray.getJSONObject(j);
ChildListDataModel cModel = new ChildListDataModel();
cModel.comment_id = jObj1.getString("comment_id");
cModel.user_id = jObj1.getString("user_id");
cModel.comment = jObj1.getString("comment");
cModel.commented_on = jObj1.getString("commented_on");
pModel.childList.add(cModel);
}
JSONArray jsonArray = jObj.getJSONArray("likes");
for (int j = 0; j < jsonArray.length(); j++) {
JSONObject jObj1 = jsonArray.getJSONObject(j);
ChildListDataModel_like clModel = new ChildListDataModel_like();
clModel.like_id = jObj1.getString("like_id");
clModel.user_id = jObj1.getString("user_id");
clModel.liked_on = jObj1.getString("liked_on");
pModel.childList.add(clModel);
}
questionDataModel_List.add(pModel);
// setData();
}
} catch (JSONException e) {
e.printStackTrace();
}
pDialog.dismiss();
jsonArray = null;
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//SetOffLineData();
pDialog.dismiss();
// Error handling
System.out.println("Something went wrong!");
error.printStackTrace();
}
});
jsonArray.setRetryPolicy(new DefaultRetryPolicy(
8000,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
Volley.newRequestQueue(this).add(jsonArray);
}
创建数据模型ImagesDataModel.class
public class QuestionDataModel {
public String image_id;
public List<ChildListDataModel> childList = new ArrayList<>();
public List<ChildListDataModel_like > childList2 = new ArrayList<>();
}
和两个子列表类
public class ChildListDataModel {
public String comment_id;
public String user_id;
public String comment;
public String commented_on;
}
答案 1 :(得分：0)
你需要做的事情
1--> Make JSON Parser seprate class for encoding and decoding JSON String.
2--> Make Aysnc class for JSON data downloading and extract in separate variables or in array with the help of JSON Parser class.
3--> perform Internet and server availability before downloading data by making class or method for it.
4--> After successfully data receiving in OnpostExcecute() Method of Async class show data in UI elements.
JSONParser.java
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
public static String Result=null;
public JSONParser()
{
}
public static JSONObject makeHttpRequest(String url,String method, List<NameValuePair> pair) {
try {
// check for request method
if(method.equals("POST")){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(pair));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method.equals("GET")){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(pair, "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, HTTP.UTF_8), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
Result = json;
} 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 jObj;
}
}
您的Activity类中的NetCheck.java
public class NetCheck extends AsyncTask<String,Object,Boolean>
{
private ProgressDialog nDialog;
NetworkInfo netInfo;
@Override
protected void onPreExecute() {
nDialog = new ProgressDialog(NetCheck.this);
nDialog.setTitle("Checking");
nDialog.setMessage("Loading..");
nDialog.setIndeterminate(false);
nDialog.setCancelable(true);
nDialog.show();
super.onPreExecute();
}
@Override
protected Boolean doInBackground(String... params) {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnected()) {
try {
URL url = new URL("http:/xxxxxxx");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(1000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
return true;
}
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
else
{
return false;
}
}
@Override
protected void onPostExecute(Boolean th) {
if (th)
{
nDialog.dismiss();
new ProcessDataClass().execute();
}
else
{
new AlertDialog.Builder(NetCheck.this)
.setTitle("Record Not Found or Server is Busy")
//.setMessage("Are you sure you want to delete this entry?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// continue with delete
nDialog.dismiss();
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
super.onPostExecute(th);
}
}
ProcessDataClass.java也在Activity类
中 public class ProcessDataClass extends AsyncTask<String, Object,Object>
{
@Override
protected String doInBackground(String... params) {
JSONObject json;
List<NameValuePair> pair = new ArrayList<>();
//make ypur own pair for reciving data
//pair.add(new BasicNameValuePair("id", String.valueOf(index)));
json = JSONParser.makeHttpRequest("http://xxxx","GET",pair);
Log.d("Route Response", json.toString());
int success = 0;
try {
// Success TAG only deals with API response not neccessory depends on API extracting or from URL TAG's
success = json.getInt(TAG_SUCCESS);
}
catch (JSONException e) {
e.printStackTrace();
}
try {
if (success == 1) {
JSONArray jsonarray;
json = new JSONObject(JSONParser.Result);
JSONArray jArray = json.getJSONArray("your TAG");
for (int i = 0; i <jArray.length(); i++) {
jsonarray = jArray.getJSONArray(i);
//Do your Logic there
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Object o) {
//Update UI as per your need
super.onPostExecute(o);
}
}
}
在Gradle中添加以下行
compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
注意：如果数据是从服务器添加URL地址检索的，如果从localhost添加模拟器和移动设备的系统IP地址，请自行检查谷歌