我正在尝试使用gson解析json。但解析后我的列表总是空的。无法找出错误的位置。
我的json是这样的
{"d":{"__type":"DealMeDataContract:#SocialEyes.Web.WcfService","DealMe":[{"__type":"DealMe:#SocialEyes.Web.Models","Address":"2075 n power line rd suit 1","CategoryId":"1","CategoryName":"Personal","City":"pompano beach","CreatedDate":"\/Date(1377621018533+0000)\/","DealMeId":"5b9b00d9-e8bf-4197-bd2a-36bc5872359f","Description":"Kick-it is the best phone stand on the market. Works with any phone or any case. Hands free use for watching movies, reading books and more. Get 2 Kick-it Kits now for the price of one. Only $19.99\u000d\u000aYou will not find this Deal Me Anywhere else!","ExpiryDate":"\/Date(1383263940000+0000)\/","HasAgreedTermsAndConditions":true,"ImageUrl":"https:\/\/socialeyesplus.blob.core.windows.net\/prodimages\/image_19bcabce-90cb-4298-9f91-c2c1d0a2161a.jpg","IsNewAddress":false,"LastUpdatedDate":"\/Date(1377621018533+0000)\/","Latitude":26.24161,"Longitude":-80.165909,"PhoneNumber":"(954)-444-8028","PreviousDealAddress":"2075 n power line rd suit 1","PreviousDealCity":"pompano beach","PreviousDealState":"FL","PreviousDealZipCode":"33069","StartDate":"\/Date(1377621017920+0000)\/","State":"FL","StateList":[{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"---Please select a State---","Value":null},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Alabama","Value":"AL"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Alaska","Value":"AK"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Arizona","Value":"AZ"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Arkansas","Value":"AR"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"California","Value":"CA"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Colorado","Value":"CO"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Connecticut","Value":"CT"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Delaware","Value":"DE"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"District of Columbia","Value":"DC"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Florida","Value":"FL"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Georgia","Value":"GA"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Guam","Value":"GU"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Hawaii","Value":"HI"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Idaho","Value":"ID"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Illinois","Value":"IL"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Indiana","Value":"IN"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Iowa","Value":"IA"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Kansas","Value":"KS"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Kentucky","Value":"KY"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Louisiana","Value":"LA"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Maine","Value":"ME"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Maryland","Value":"MD"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Massachusetts","Value":"MA"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Michigan","Value":"MI"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Minnesota","Value":"MN"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Mississippi","Value":"MS"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Missouri","Value":"MO"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Montana","Value":"MT"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Nebraska","Value":"NE"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Nevada","Value":"NV"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"New Hampshire","Value":"NH"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"New Jersey","Value":"NJ"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"New Mexico","Value":"NM"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"New York","Value":"NY"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"North Carolina","Value":"NC"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"North Dakota","Value":"ND"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Ohio","Value":"OH"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Oklahoma","Value":"OK"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Oregon","Value":"OR"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Pennsylvania","Value":"PA"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Puerto Rico","Value":"PR"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Rhode Island","Value":"RI"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"South Carolina","Value":"SC"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"South Dakota","Value":"SD"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Tennessee","Value":"TN"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Texas","Value":"TX"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Utah","Value":"UT"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Vermont","Value":"VT"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Virginia","Value":"VA"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Washington","Value":"WA"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"West Virginia","Value":"WV"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Wisonsin","Value":"WI"},{"__type":"SelectListItem:#System.Web.Mvc","Selected":false,"Text":"Wyoming","Value":"WY"}],"SubCategoryId":"124","SubCategoryName":"Electronics","Title":"Kickit phone stand ","UserId":"6851e89f-4a32-496e-b2b6-ea461f31b3bd","ZipCode":"33069"}],"Status":"Success"}}
要将json转换为java对象，我创建了一个类似这样的类
public class AllDeals {
public String _type;
public List<Deal> DealMe = new ArrayList<AllDeals.Deal>();
public String Status;
public List<Deal> getDealList() {
return DealMe;
}
public static class Deal {
public String __type;
public String Address;
public String CategoryId;
public String CategoryName;
public String City;
public String CreatedDate;
public String DealMeId;
public String Description;
public String ExpiryDate;
public String HasAgreedTermsAndConditions;
public String ImageUrl;
public String IsNewAddress;
public String LastUpdatedDate;
public String Latitude;
public String Longitude;
public String PhoneNumber;
public String PreviousDealAddress;
public String PreviousDealCity;
public String PreviousDealState;
public String PreviousDealZipCode;
public String StartDate;
public String State;
public List<AllDeals.StateList> StateList;
public String SubCategoryId;
public String SubCategoryName;
public String Title;
public String UserId;
public String ZipCode;
}
public static class StateList {
public String __type;
public String Selected;
public String Text;
public String Value;
}
}
private final Gson mGson = new Gson();
AllDeals cateResponse = mGson.fromJson(jsonString, AllDeals.class);
我的列表总是空的，无法找出原因
答案 0 :(得分：2)
要解决您的解析问题而不更改初始JSON字符串，我添加了这样一个类：
public class Container {
private AllDeals d;
@Override
public String toString() {
return "Container [d=" + d + "]";
}
}
这样就可以像这样调用解析：
package stackoverflow.questions.q18930222;
import com.google.gson.Gson;
public class Q18930222 {
/**
* @param args
*/
public static void main(String[] args) {
String jsonString = "{\"d\":{\"__type\":\"DealMeDataContract\",\"DealMe\":[{\"__type\":\"DealMe\",\"Address\":\"2075 n power line rd suit 1\",\"CategoryId\":\"1\",\"CategoryName\":\"Personal\",\"City\":\"pompano beach\",\"CreatedDate\":\"\\/Date(1377621018533+0000)\\/\",\"DealMeId\":\"5b9b00d9-e8bf-4197-bd2a-36bc5872359f\",\"Description\":\" Get 2 Kick-it Kits now for the price of one. Only $19.99\\u000d\\u000aYou welse!\",\"ExpiryDate\":\"\\/Date(1383263940000+0000)\\/\",\"HasAgreedTermsAndConditions\":true,\"ImageUrl\":\"null\",\"IsNewAddress\":false,\"LastUpdatedDate\":\"\\/Date(1377621018533+0000)\\/\",\"Latitude\":26.24161,\"Longitude\":-80.1f909,\"PhoneNumber\":\"(954)-454-88\",\"PreviousDealAddress\":\"2075 ne rd suit 1\",\"PreviousDealCity\":\"pompano beach\",\"PreviousDealState\":\"FL\",\"PreviousDealZipCode\":\"33069\",\"StartDate\":\"\\/Date(11017920+0000)\\/\",\"State\":\"FL\",\"StateList\":[{\"__type\":\"SelectListItem:#SyMvc\",\"Selected\":false,\"Text\":\"---Please select a State---\",\"Value\":null},{\"__type\":\"SelectListItem:#Syseb.Mvc\",\"Selected\":false,\"Text\":\"Alabama\",\"Value\":\"AL\"},{\"__type\":\"SelectListItem:#Sys.Mvc\",\"Selected\":false,\"Text\":\"Alaska\",\"Value\":\"AK\"}],\"SubCategoryId\":\"124\",\"SubCategoryName\":\"Electronics\",\"Title\":\"Kice stand \",\"UserId\":\"b3bd\",\"ZipCode\":\"45469\"}],\"Status\":\"Success\"}}";
Gson mGson = new Gson();
Container cateResponse = mGson.fromJson(jsonString, Container.class);
System.out.println(cateResponse);
}
}
并为您提供此结果（我添加了toString方法）：
Container [d=AllDeals [_type=null, DealMe=[Deal [__type=DealMe, Address=2075 n power line rd suit 1, CategoryId=1, CategoryName=Personal, City=pompano beach, CreatedDate=/Date(1377621018533+0000)/, DealMeId=5b9b00d9-e8bf-4197-bd2a-36bc5872359f, Description= Get 2 Kick-it Kits now for the price of one. Only $19.99
You welse!, ExpiryDate=/Date(1383263940000+0000)/, HasAgreedTermsAndConditions=true, ImageUrl=null, IsNewAddress=false, LastUpdatedDate=/Date(1377621018533+0000)/, Latitude=26.24161, Longitude=-80.1f909, PhoneNumber=(954)-454-88, PreviousDealAddress=2075 ne rd suit 1, PreviousDealCity=pompano beach, PreviousDealState=FL, PreviousDealZipCode=33069, StartDate=/Date(11017920+0000)/, State=FL, StateList=[StateList [__type=SelectListItem:#SyMvc, Selected=false, Text=---Please select a State---, Value=null], StateList [__type=SelectListItem:#Syseb.Mvc, Selected=false, Text=Alabama, Value=AL], StateList [__type=SelectListItem:#Sys.Mvc, Selected=false, Text=Alaska, Value=AK]], SubCategoryId=124, SubCategoryName=Electronics, Title=Kice stand , UserId=b3bd, ZipCode=45469]], Status=Success]]
如果你想避开Container类，你应该在开始时更改你的JSON字符串{"d":，最后删除}。但通常99％的JSON问题都不允许更改解析后的字符串。
答案 1 :(得分：1)
我得到了答案。我在开始时缺少主要的json对象，使用gson lib来解析这个json字符串应该是这样的
public class AllDeals {
public MainDealArray d;
public static class MainDealArray{
public String __type;
public List<Deal> DealMe = new ArrayList<AllDeals.Deal>();
public String Status;
public List<Deal> getDealList() {
return DealMe;
}
}
public static class Deal {
public String __type;
public String Address;
public String CategoryId;
public String CategoryName;
public String City;
public String CreatedDate;
public String DealMeId;
public String Description;
public String ExpiryDate;
public String HasAgreedTermsAndConditions;
public String ImageUrl;
public String IsNewAddress;
public String LastUpdatedDate;
public String Latitude;
public String Longitude;
public String PhoneNumber;
public String PreviousDealAddress;
public String PreviousDealCity;
public String PreviousDealState;
public String PreviousDealZipCode;
public String StartDate;
public String State;
public List<AllDeals.StateList> StateList;
public String SubCategoryId;
public String SubCategoryName;
public String Title;
public String UserId;
public String ZipCode;
}
public static class StateList {
public String __type;
public String Selected;
public String Text;
public String Value;
}
}
答案 2 :(得分：0)
//Hope this will help u..i m fetching this type of url like this
//create class
/String Method to fetech data from server
public String sendRequest(String url) {
String result = "";
try {
HttpClient client = new DefaultHttpClient();
HttpParams httpParameters = client.getParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, 5000);
HttpConnectionParams.setSoTimeout(httpParameters, 5000);
HttpConnectionParams.setTcpNoDelay(httpParameters, true);
HttpGet request = new HttpGet();
request.setURI(new URI(url));
HttpResponse response = client.execute(request);
InputStream ips = response.getEntity().getContent();
BufferedReader buf = new BufferedReader(new InputStreamReader(ips,
"UTF-8"));
StringBuilder sb = new StringBuilder();
String s;
while (true) {
s = buf.readLine();
if (s == null || s.length() == 0)
break;
sb.append(s);
}
buf.close();
ips.close();
result = sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
//fetch thorug like this
class LoadVideo extends AsyncTask<String,Void,String>{
ProgressDialog mProgress;
@Override
protected void onPreExecute() {
mProgress=new ProgressDialog(SubCategory.mContext);
mProgress.setTitle("Fetch Video...");
mProgress.setMessage("Please Wait...");
mProgress.setCancelable(false);
mProgress.show();
}
@Override
protected String doInBackground(String... params) {
String response="";
try{
String url="your url paste here"
response = sendRequest(url);
}catch(Exception e){
e.printStackTrace();
return "";
}
return response;
}
@Override
protected void onPostExecute(String result) {
if (!result.equalsIgnoreCase("")) {
try {
JSONObject mainObject = new JSONObject(result);
if (mainObject.has("ID")) {
String id = mainObject.getString("ID");
}
if (mainObject.has("VideoID")) {
mVideoId = mainObject.getString("VideoID");
}
if (mainObject.has("Title")) {
String title = mainObject.getString("Title");
}
if (mainObject.has("Description")) {
String desc = mainObject.getString("Description");
}
if (mainObject.has("Script")) {
String script = mainObject.getString("Script");
}
if (mainObject.has("Phrases")) {
String phrases = mainObject.getString("Phrases");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
mProgress.dismiss();
}
}