I'm trying to implement an API with a GraphQL query in my android app but having trouble with how to go about converting the cURL to java. I'm relatively new to programming so I've been trying to follow tutorials and questions on here but having no luck for the past few days.
Basically the cURL command sends a GraphQL query and returns a json which I'd like to extract specific data from.
The cURL command is as follows
curl -v 'https://api.url/' \
-H 'content-type: application/json' \
-H 'accept: application/json' \
-H 'x-api-key: <YOUR_API_KEY>' \
--data-binary '{"query":"{ Search(query: \"searchVariable\") {items{description} } }","variables":"{}","operationName":null}'
When I run this in the terminal it returns a json string. I would like to return this in my app and extract data from the json. I think I can do this using a json object but cannot get the data in the first place
Here is one method I tried using another tutorial, it builds successfully but crashes as soon as I attempt to call the method.
public static String URLConnection() throws IOException, JSONException {
URL url = new URL("https://api./api/graphql/");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.addRequestProperty("curl", "'https:/api/graphql/'");
connection.addRequestProperty("content-type", "application/json");
connection.addRequestProperty("accept", "application/json");
connection.addRequestProperty("x-api-key", "'xxxxxxxxxxx'");
connection.addRequestProperty("--data-binary", "{\"query\":\"{Search(query:\"Query\"){items{description}}}\",\"variables\":\"{}\",\"operationName\":null}");
connection.setUseCaches(false);
connection.setDoInput(true);
connection.setDoOutput(true);
connection.connect();
JSONObject jsonParam = new JSONObject();
jsonParam.getString("description");
OutputStream os = connection.getOutputStream();
os.write(Integer.parseInt(URLEncoder.encode(jsonParam.toString(), "UTF-8")));
os.close();
try {
InputStream in = connection.getInputStream();
Scanner scanner = new Scanner(in);
scanner.useDelimiter("\\A");
boolean hasInput = scanner.hasNext();
if (hasInput) {
return scanner.next();
} else {
return null;
}
} finally {
connection.disconnect();
}
}
Related
I have a java application with this code :
URL url = new URL("http://myurl/");
HttURLConnection connection = (HttURLConnection) url.openConnection();
connection.setDoInput(true);
connection.setDoOutplut(true);
connection.setRequestProperty("Content-Type", "application/json");
BufferedWriter buffer = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
buffer.write("{\"foo:\"0}");
buffer.flush();
I just want to do the samething in my navigatour URL bar.
Edit
I found a tool to modifier headers. Here a screenshoot of the dev tool when I load my page.
Now where did I put my Json object?
If you need to send JSON data to your URL your code should be like this,
URL url = new URL("http://myurl/");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setDoOutput(true);
con.setRequestMethod("POST");
con.setRequestProperty("Content-Type", "application/json");
String input = "{\"foo\":\"bar\"}";
OutputStream ous = con.getOutputStream();
ous.write(input.getBytes());
ous.flush();
if (con.getResponseCode() != HttpURLConnection.HTTP_OK)
{
throw new RuntimeException("Failed : HTTP error code : " + con.getResponseCode());
}else
{
BufferedReader br = new BufferedReader(new InputStreamReader((con.getInputStream())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null)
{
System.out.println(output);
}
}
con.disconnect();
If you need GET Method then you can place this,
con.setRequestMethod("GET");
con.setRequestProperty("Accept", "application/json");
If you need to send Request Body with the URL you can use CURL. And also you can use POSTMAN. By using this you can send requests and receive the response.
CURL will be like this,
curl -v -H "Content-Type: application/json" -X POST \
-d '{\"foo\":\"bar\"}' http://myurl/
You can use Firefox to perform what you need, Read the 2nd answer.
I'm trying make a request with Java, when I call it using cURL like this, it works:
curl -X PUT http://serverurl.com/method/6eb276a2-5c79-4f6e-a4b5-a26b0e6848c7/action -H 'Content-Type: application/json' -H 'Token: cba5f12c-af55-480f-970e-525e446ef153' -H 'Content-Length : 0'
If I call the same request without passing header Content-Length param, I get 411 HTTP error, length required.
This is my code in Java:
URL url = new URL("http://serverurl.com/method/6eb276a2-5c79-4f6e-a4b5-a26b0e6848c7/action");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("PUT");
con.addRequestProperty("Content-Type", "application/json");
con.addRequestProperty("Token", "cba5f12c-af55-480f-970e-525e446ef153");
con.connect();
This request is getting a 411 HTTP code response. So, I tryed to add:
con.addRequestProperty("Content-Length", "0");
But it doesn't work, so I changed to:
URL url = new URL("http://serverurl.com/method/6eb276a2-5c79-4f6e-a4b5-a26b0e6848c7/action");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("PUT");
con.addRequestProperty("Content-Type", "application/json");
con.addRequestProperty("Token", "cba5f12c-af55-480f-970e-525e446ef153");
con.setDoOutput(true);
con.getOutputStream().close();
con.setFixedLengthStreamingMode(0);
con.connect();
But now I'm getting 400 HTTP code.
How can I do a PUT request with an empty body and setting content length to match the cURL call?
using the HttpUrlConnection, you should use the setRequestProperty method to add headers to your request. I can see your using the "addRequestProperty" which is probably why its not working. But refer to this link for more info https://juffalow.com/java/how-to-send-http-get-post-request-in-java and heres some code that i use to for a put request
URL url = new URL(BASE_URL+"/"+userID+".json");
urlRequest = (HttpURLConnection) url.openConnection();
urlRequest.setDoOutput(true);
urlRequest.setRequestMethod("PUT");
urlRequest.setRequestProperty("Content-Type", "application/json;
charset=UTF-8");
OutputStream os = urlRequest.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os, "UTF-8");
osw.write("{\"idToken\":\""+"token"+"\"}");
osw.flush();
osw.close();
urlRequest.connect();
JsonParser jp = new JsonParser(); //from gson
JsonElement root = jp.parse(new InputStreamReader((InputStream)
urlRequest.getContent()));//Convert the input stream to a json element
JsonObject rootobj = root.getAsJsonObject();//Maybe an array or object
well thats just sample what i use... and i hope this works for you. Happy coding.
I am trying to make a request to my RESTful API using Android and HttpURLConnection. The data must be sent in the JSON format via POST data.
Here is my code:
JSONObject check_request = new JSONObject();
check_request.put("username", username);
JSONObject request = BuildRequest(check_request, "username_check", false);
Log.i("DEBUG", request.toString());
// DEBUG OUTPUT: {"timestamp":1526900318,"request":{"username":"blubberfucken","type":"username_check"}}
URL request_url = new URL(apiURL);
HttpURLConnection connection = (HttpURLConnection)request_url.openConnection();
connection.setRequestProperty("User-Agent", "TheGameApp");
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-type", "application/json; charset=UTF-8");
connection.setDoOutput(true);
connection.setDoInput(true);
OutputStream os = connection.getOutputStream();
os.write(request.toString().getBytes("UTF-8"));
os.flush();
InputStream in = new BufferedInputStream(connection.getInputStream());
String result = "";
BufferedReader br = new BufferedReader(new InputStreamReader(in, "UTF8"));
String str;
while ((str = br.readLine()) != null)
{
result += str;
}
Log.i("DEBUG", result);
//JSONObject result_json = new JSONObject(result);
os.close();
in.close();
connection.disconnect();
You can see the Debug output as a Comment. The Problem is that the API does not receive any POST data. I have used PHPs var_dump to dump $_POST and $_REQUEST which both are empty arrays.
What am I missing here?
As the question popped up if the API work. This cURL command works fine with the correct result (it is the same JSON data as the debugger printed):
curl -d '{"timestamp":1526900318,"request":{"username":"blubberfucken","type":"username_check"}}' -H "Content-Type: application/json" -X POST http://localhost/v1/api.php
Just for the sake of completeness: The example above is working. The solution to the problem was pa part in PHP on the server side, where I checked the content type and used strpos to search for application/json in $_SERVER['CONTENT-TYPE'] and switched the needle and haystack (thus searching for application/json; charset=UTF8 in the string application/json instead of the other way around).
I'm a bit stuck here and I don't know why. It's probably very simple. I want to post changes to a Wordpress site from a Java app.
The following curl example does as it should:
curl -X POST -H "Content-Type: application/json" -d '{"title":"hello123"}' -u user:pass http://myurl.com/wp-json/wp/v2/posts/219 -v
The following code example not:
try {
URL url = new URL("http://myurl.com/wp-json/wp/v2/posts/219");
String encoding = Base64.encodeBase64String((txtUserName.getText() + ":" + txtPassword.getText()).getBytes());
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setRequestProperty("Authorization", "Basic " + encoding);
connection.setRequestProperty("Content-Type", "application/json");
connection.setRequestMethod("POST");
connection.connect();
ObjectMapper post = new ObjectMapper();
ObjectNode node = post.createObjectNode();
node.put("title", "test1234");
OutputStream os = connection.getOutputStream();
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(os, "UTF-8");
outputStreamWriter.write(post.toString());
outputStreamWriter.flush();
outputStreamWriter.close();
} catch (Exception e) {
e.printStackTrace();
}
So I'm grateful for any help.
Thank you very much
I was asked to port a PHP module I was writing to Java. I was previously using PHP's native cURL library, now trying to achieve the same action with HttpURLConnection.
Here's the call I want to do with cURL:
curl -u 'ExactID:Password' \
-H 'Content-Type: application/json; charset=UTF-8' \
-H 'Accept: application/json' \
-d '{
"transaction_type":"00",
"amount":"15.75",
"cardholder_name":"PaulTest",
"transarmor_token":"3000",
"credit_card_type":"Visa",
"cc_expiry":"0016",
}' \
https://api.demo.globalgatewaye4.firstdata.com/transaction/v11
Here's what I have in Java, which returns a HTTP 400 error. Any ideas?
public static void main(String[] args) {
URL url = new URL("https://api.demo.globalgatewaye4.firstdata.com/transaction/v11");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
conn.setRequestProperty("Accept", "application/json");
String userpass = "ExactID" + ":" + "Password";
String basicAuth = "Basic " + new String(new Base64().encode(userpass.getBytes()));
conn.setRequestProperty ("Authorization", basicAuth);
JSONObject obj = new JSONObject();
obj.put("transaction_type", "00");
obj.put("amount", "10");
obj.put("cardholder_name", "PaulTest");
obj.put("transarmor_token", "3000");
obj.put("cc_expiry", "0016");
obj.put("credit_card_type", "Visa");
String input = obj.toString();
System.out.println(input);
OutputStream os = conn.getOutputStream();
os.write(input.getBytes());
os.flush();
if (conn.getResponseCode() != HttpURLConnection.HTTP_CREATED) {
throw new RuntimeException("Failed : HTTP error code : "+ conn.getResponseCode() + conn.getResponseMessage());
}
One ambiguity in your java code is on string to byte array encoding. By default java will use your default platform encoding, but it's a good practice to express it explicitly because it often lead to hard to track bug
String basicAuth = "Basic " + new String(new Base64().encode(userpass.getBytes("ISO-8859-1")));
To be sure also check the encoded base 64 value generated by java on curl by using
-H 'Authorization: Basic ....`
Instead of -u
Also I'd try to cast the created URLConnection to HttpsURLConnection. Thay may/not make difference
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
After tinkering around, I made two mistakes:
For this POST method, basic authentication was not required. The user & pw goes into the JSON body along with the other parameters.
Also, my "transarmor_token" field needed to be 16 digits.
Conclusion: HttpURLConnection is a great cURL alternative. Forget about using the curl-java binding.
Thanks!