How do I pass the jsonObj from the javascript code in getJson to the java code handleJsonResponse. If my syntax is correct, what do I do with a JavaScriptObject?
I know that the jsonObj contains valid data because alert(jsonObj.ResultSet.totalResultsAvailable) returns a large number :) --- but some how it's not getting passed correctly back into Java.
EDIT: I solved it... by passing in jsonObj.ResultSet.Result to the java function and working on it using a JSONArray.
Thanks.
public native static void getJson(int requestId, String url, MyClass handler) /*-{
alert(url);
var callback = "callback" + requestId;
var script = document.createElement("script");
script.setAttribute("src", url+callback);
script.setAttribute("type", "text/javascript");
window[callback] = function(jsonObj) { // jsonObj DOES contain data
handler.#com.michael.random.client.MyClass::handleJsonResponse(Lcom/google/gwt/core/client/JavaScriptObject;)(jsonObj);
window[callback + "done"] = true;
}
document.body.appendChild(script);
}-*/;
public void handleJsonResponse(JavaScriptObject jso) { // How to utilize JSO
if (jso == null) { // Now the code gets past here
Window.alert("Couldn't retrieve JSON");
return;
}
Window.alert(jso.toSource()); // Alerts 'null'
JSONArray array = new JSONArray(jso);
//Window.alert(""+array.size());
}
}
Not exactly sure how to fix this problem that I had, but I found a workaround. The javascript jsonObj is is multidimensional, and I didn't know how to manipulate the types in the java function. So instead, I passed jsonObj.ResultSet.Result to my function handler, and from there I was able to use get("string") on the JSONArray.
What is toSource() supposed to do? (The documentation I see for it just says "calls toSource".) What about toString()?
If your call to alert(jsonObj.ResultSet.totalResultsAvailable) yields a valid result, that tells me jsonObj is a JavaScript Object, not an Array. Looks to me like the constructor for JSONArray only takes a JS Array (e.g., ["item1", "item2", {"key":"value"}, ...] )
Related
I have broke it down to a minimum and still don't know why this happens.
I have the following method in my controller:
#RequestMapping(method = RequestMethod.POST, value = "/myGreatCall")
public String getDynamicData(#RequestBody DataRequest dr) {
return dr.toString();
}
Using the following simple class:
public class DataRequest {
private String type;
//Getters and setters here
}
Now if I try to call this, I get an error 400 as the response.
let url = window.location.protocol+"//"+window.location.host+"/myGreatCall";
let request = new XMLHttpRequest();
request.open("POST", url, true);
request.onload = function () {
console.log(request.response); //Here I read the reponse and get the error 404
};
// This is the data I send as the body
let data = JSON.stringify(
{
type: "myType"
}
);
request.setRequestHeader("Content-Type", "application/json");
request.send(data);
Now from the error I suspect that for some reason it cant map my json object into the java object, but I have no idea why.
I tested the following:
do the request without the Method Parameter, that worked
different data types in the java class
handing over a hardcoded string '{\"type\":\"myType\"}' to the #send()
Any Ideas what I might be doing wrong?
It may be down to JSON serialization. Try this:
let data = JSON.stringify(
{
"type": "myType"
}
);
Ok seems to be something weird. I dont know what caused it, but after a PC restart it worked fine.
I am programming a flutter app, in which I have a callback from the native system containing some nfc information. I register the callback via the following line of code:
eventChannel.receiveBroadcastStream().listen(_onEvent, onError: _onError);
The callback looks like this:
void _onEvent(Object event) {
//Receive Event
print("NFC Event received");
//Get the Payload
event['Payload']; //This does not work, it gives an error
}
But how can I parse out the data? I know it contains a field by the name Payload however, I cannot access it via event['Payload'].
I am very confused, I tried to cast it to another type like this: Map<String, String> eventMap = Map<String, String>.from(event); but that didnt work. Could someone please point out what I am doing wrong and how I can correctly extract the data?
Without too much information of native part, I suggest
you can reference this package or fork this https://github.com/akeblom/flutter-nfc-reader
directly
this repo fix some issue of pub.dev and work well in real device
the dart code you need reside in
https://github.com/akeblom/flutter-nfc-reader/blob/master/lib/flutter_nfc_reader.dart
void _onEvent(dynamic data) {
print("Event");
print(data);
}
Edit add more detail
akeblom has add Write NFC capability to IOS, so IOS part should work. please ue this fork https://github.com/akeblom/flutter-nfc-reader
For IOS MissingPluginException issue, I do not have IOS, I suggest you can ask akeblom
The data part you mentioned in comments if I do not misunderstand is line 77, please see describe below
In Android part.
https://github.com/akeblom/flutter-nfc-reader/blob/master/android/src/main/kotlin/it/matteocrippa/flutternfcreader/FlutterNfcReaderPlugin.kt
line 174, use kotlin mapOf returns a new read-only map with the specified contents and eventSink.success result to Dart
if (message != null) {
val data = mapOf(kId to id, kContent to message, kError to "", kStatus to "read")
eventSink?.success(data)
}
In https://github.com/akeblom/flutter-nfc-reader/blob/master/lib/flutter_nfc_reader.dart
line 22, with named constructor
factory NfcData.fromMap(Map data) {
NfcData result = NfcData(
id: data['nfcId'],
content: data['nfcContent'],
error: data['nfcError'],
statusMapper: data['nfcStatus'],
);
In line 77, NFC read start and _onEvent(dynamic data) get the data.
stream use this named constructor, and parse data, here with map((result)) transfer to NfcData
static Stream<NfcData> get read {
final resultStream = _channel
.invokeMethod('NfcRead')
.asStream()
.asyncExpand((_) => stream
.receiveBroadcastStream()
.map((result) => NfcData.fromMap(result)));
return resultStream;
In https://github.com/akeblom/flutter-nfc-reader/blob/master/example/lib/main.dart
line 33, response has transfered to NfCData, so example just use _nfcData = response;
FlutterNfcReader.read.listen((response) {
setState(() {
_nfcData = response;
});
});
The simplest way I found to parse an event to a Map is the following:
I encoded the variable to a String (but I use json.encode(event)instead of event.toString()as encode(event)returns a valid string.
Then I use this string to construct a map via json.decode. All of this is achieved with the flutter native library dart:convert. The complete code looks like this:
import 'dart:convert';
...
void _onEvent(dynamic event) {
//Receive Event
print("NFC Event received");
String str = json.encode(event);
Map eventMap = json.decode(str);
}
Have you tried event.toString()? It might return a string containing the field you are trying to get, from which you can easily parse the value.
You may also want to try:
Class<?> clazz = event.getClass();
Field payload= clazz.getField("Payload"); //Note, this can throw an exception if the field doesn't exist.
String fieldValue = payload.toString();
If it isn't returning what you want, you may need to make an interface for the object type, with a get method, or override the toString method to get return the Payload value.
I am using Unity 5.5.2f1 pro and facebook's SDK v 7.9.4
I have a script which after login (managed in a previous scene) sends an API request to FB asking for friends, name and email and sends that info as a POST to a php website.
code:
[Serializable]
public struct FBData {
public string first_name;
public string email;
public string friends;
public string id;}
public class UserManagement : MonoBehaviour {
string urlSaveUserData="some php website";
public Text testTxt;
FBData parsedData;
// Use this for initialization
void Start () {
//Check if it's the first time the user is opening the app.
if (UserInfo.FIRST_TIME) {
//update text (only used for testing, should be removed in production.)
testTxt.text = "Your user id is: " + UserInfo.ID;
//Perform FB.API call to get User Data.
getUserData ();
//Save in SQL table. (won't get here if line in getUserData() is active)
StartCoroutine ("saveUserData");
} else {
//do something else.
}
note: Since this is meant for iOS I have to test it on a device so I'm using text in the screen to display info (think of it as a badly implemented print statement).
The problem: In my callback function for FB.API I write in the text Gameobject (aka testTxt) the parsed information from the response which is saved in the Custom UserInfo clss. It display's correctly but the code gets stuck there. It doesn't continue to the next function. HOWEVER, if I delete/comment that line and don't display anything in the text field. The codes does continue to the POST function BUT the information from the API call is not passed, i.e my custom class is empty (leading me to believe the callback function is not called at all).
public void getUserData(){
string query = "me?fields=first_name,email,friends";
FB.API (query, HttpMethod.GET, Apicallback, new Dictionary<string, string> ());
}
private void Apicallback(IGraphResult result){
//Parse Graph response into a specific class created for this result.
parsedData = JsonUtility.FromJson<FBData>(result.RawResult);
//Pass each field into UserInfo class.
UserInfo.EMAIL = parsedData.email;
UserInfo.FRIENDS = parsedData.friends;
UserInfo.NAME = parsedData.first_name;
UserInfo.FACEBOOKID = parsedData.id;
/*problem area, if I comment line below, then previous information is apparently not stored. If left as is then testTxt displays correct information but code gets stuck there. */
testTxt.text = "This is the info from USerInfoInside the APICallback: " + UserInfo.EMAIL + UserInfo.FRIENDS + UserInfo.FACEBOOKID;
}
The function below is to send info to php website, is there for illustrative purposes:
code:
public IEnumerator saveUserData() {
//get user info (this information is EMPTY if line in getUserData() is commented.
parsedData.id = UserInfo.FACEBOOKID;
parsedData.friends = UserInfo.FRIENDS;
parsedData.first_name = UserInfo.NAME;
parsedData.email = UserInfo.EMAIL;
//translate data into json
string JsonBodyData = JsonUtility.ToJson (parsedData);
//Custom web request (POST method doesnt seem to work very well, documentation example sends empty form)
var w = new UnityWebRequest(urlSaveUserData, "POST");
byte[] bodyRaw = new System.Text.UTF8Encoding().GetBytes(JsonBodyData);
w.uploadHandler = (UploadHandler) new UploadHandlerRaw(bodyRaw);
w.downloadHandler = (DownloadHandler) new DownloadHandlerBuffer();
w.SetRequestHeader("Content-Type", "application/json");
yield return w.Send();
//work with received data...}
Im stuck here any help is appreciated. Thanks!
Be sure to use EscapeURL when using strings directly for JSON or HTTP POST and GET methods. The lack of this treatment tends to screw things over, particulary in iOS platforms.
From what I can see, this code
string query = "me?fields=first_name,email,friends";
should instead be escaped as
string query = WWW.EscapeURL("me?fields=first_name,email,friends");
so characters like "?" won't get encoded as an URL symbol.
I'm assuming you don't need to do that for your illustrative example, because UnityWebRequest already escapes your POST request strings internally, but I can't fully confirm that.
I'm writing an RESTful API which consumes another RESTful Data API, and I'm using Spring Data.
The client side send the page request using query params like:
http://api.mysite.com/products?page=1&size=20&sort=id,asc&sort=name,desc
And I transform the params to PageRequest object and transfer it to the Service Layer.
In the service, I would like to use TestTemplate to interact with the Data API which use a URL, and How can I transform the PageRequest object to a query string like
page=1&size=20&sort=id,asc&sort=name,desc
then I can request data like:
restTemplate.getForEntity("http://data.mysite.com/products?page=1&size=20&sort=id,asc&sort=name,desc",String.class)
I know I am a bit late on this answer, but I too was not able to found an already implemented way to do this. I ended up developing my own routine for doing this:
public static String encodeURLComponent(String component){
try {
return URLEncoder.encode(component, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("You are dumm enough that you cannot spell UTF-8, are you?");
}
}
public static String queryStringFromPageable(Pageable p){
StringBuilder ans = new StringBuilder();
ans.append("page=");
ans.append(encodeURLComponent(p.getPageNumber() + ""));
// No sorting
if (p.getSort() == null)
return ans.toString();
// Sorting is specified
for(Sort.Order o : p.getSort()){
ans.append("&sort=");
ans.append(encodeURLComponent(o.getProperty()));
ans.append(",");
ans.append(encodeURLComponent(o.getDirection().name()));
}
return ans.toString();
}
It is not complete, there probably are a couple of details that I am missing, but for my user case (and I think for most of them) this works.
you can pass as new :
new PageRequest(int page,int size)
And in repository layer you can write as:
Page<User> findByName(String name,Pageable page)
in place of Pageable page you have to pass new PageRequest(int page,int size)
For ascending order you can refer this:
List<Todo> findByTitleOrderByTitleAsc(String title);
I think you just need to iterate through the request parameters from your other API request, and then pass all the parameters values into the new Url for a new API request.
sudo code could be:
//all query params can be found in Request.QueryString
var queryParams = Request.QueryString;
private string ParseIntoQuery(NameValueCollection values)
{
//parse the identified parameters into a query string format
// (i.e. return "?paramName=paramValue¶mName2=paramValue2" etc.)
}
in your code, you will then do this:
restTemplate.getForEntity(urlAuthority + ParseIntoQuery(Request.QueryString));
simple as that. Hope that answers?
UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromHttpUrl("http://data.mysite.com/products");
addRequestParam(uriComponentsBuilder, "page", pageable.getPageNumber());
addRequestParam(uriComponentsBuilder, "size", pageable.getPageSize());
String uri = uriComponentsBuilder.toUriString() + sortToString(pageable.getSort());
addRequestParam method:
private static void addRequestParam(UriComponentsBuilder uriBuilder, String parameterName, Object parameter) {
if (parameter != null) {
uriBuilder.queryParam(parameterName, parameter);
}
}
implement sortToString(Sort sort) method as #Shalen. You have to obtain something like this: &sort=name,asc&sort=name2,desc. Return "" if Sort is null;
EDIT I think because it is an asychronous call that when I call the method data has not been set yet.
String theData = getData("trainer") // not set yet
I have the following JSNI function. The if I call this function it returns an empty string, however the console.log before it show that data is there. Seems data cannot be returned for some reason.
public native String getData(String trainerName)/*-{
var self = this;
$wnd.$.get( "http://testdastuff.dev/trainerstats", { trainer: trainerName} )
.fail(function() {
$wnd.console.log("error");
})
.done(function( data ) {
console.log("DATA IS: " + data);
return data;
});
}-*/;
Your thought that it is a asynchronous call is correct.
The return of the callback passed to done is not returned to the original call you made.
If you used the following code, you'll get 2 messages in the console, in the first you'll get empty data, and in the second, the correct data.
String theData = getData("trainer");
consoleLog("The data is " + theData);
// suppose consoleLog as a native function to console.log
Thus you should probably do your callback like this.
.done(function( data ) {
console.log("DATA IS: " + data);
theData = data; // if theData is within the same scope and you want to store
doSomethingWith(theData); // <-- here you can interact with theData
})
The doSomethingWith(theData) could even be an invocation to a Java method.