How to perform a post request using json file as body

Question

I'm new in using REST call . I have a test.json file in my project.

Content of the file is:

{ "Added": { "type": "K", "newmem": { "IDNew": { "id": "777709", "type": "LOP" }, "birthDate": "2000-12-09" }, "code": "", "newest": { "curlNew": "", "addedForNew": "" } } }

Code in Java :

import java.io.DataInputStream; import java.io.File; //import org.json.JSONObject; import java.io.FileReader; import java.io.IOException; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.URL; import javax.net.ssl.HttpsURLConnection; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; import org.json.simple.parser.ParseException; public class TestAuth { public static void main(String[] args) { // TODO Auto-generated method stub File file = new File("test.json"); try { JSONParser parser = new JSONParser(); //Use JSONObject for simple JSON and JSONArray for array of JSON. JSONObject data = (JSONObject) parser.parse( new FileReader(file.getAbsolutePath()));//path to the JSON file. System.out.println(data.toJSONString()); URL url2 = new URL("myURL"); HttpsURLConnection conn = (HttpsURLConnection) url2.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("Accept", "application/json"); conn.setRequestProperty("Authorization", "Bearer aanjd-usnss092-mnshss-928nss"); conn.setDoOutput(true); OutputStream outStream = conn.getOutputStream(); OutputStreamWriter outStreamWriter = new OutputStreamWriter(outStream, "UTF-8"); outStreamWriter.write(data.toJSONString()); outStreamWriter.flush(); outStreamWriter.close(); outStream.close(); String response = null; DataInputStream input = null; input = new DataInputStream (conn.getInputStream()); while (null != ((response = input.readLine()))) { System.out.println(response); input.close (); } } catch (IOException | ParseException e) { e.printStackTrace(); } } }

Exception: java.io.IOException: Server returned HTTP response code: 401 for URL: https://url_example.com/ at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1894) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263) at ab.pkg.TestAuth.main(TestAuth.java:44)

In Soap Ui , Adding the Endpoint and above content as a request body for the POST request is a successful response .

How can I read the json content and pass it as a request body in java ?

Would this help you? Sending HTTP POST Request In Java There is a section inside my answer there that explains how to send the request as JSON, and for that you need to make sure to send the project ContentType headers — Ferrybig
– Ferrybig, Commented Nov 20, 2018 at 7:46
@Ferrybig Thanks for reply . As mentioned in the question that i have big json data which is saved in json file . So i cannot add all data in byte array. I need to read the json file and pass as request . — Little bird
– Little bird, Commented Nov 20, 2018 at 7:50
If you combine the answer Sebastien posted and my answer I linked, you can make it work, his answer produces a json string from your file, that my answer then sends to your backend — Ferrybig
– Ferrybig, Commented Nov 20, 2018 at 7:58
@Ferrybig : Thanks but Sebastien answers only adds 2 data i.e email and password but i have a big json file , How to add all and send as request ? — Little bird
– Little bird, Commented Nov 20, 2018 at 8:05
Possible duplicate of the question: stackoverflow.com/a/21177617/2381544 — Vineeth Chitteti
– Vineeth Chitteti, Commented Nov 25, 2018 at 9:57

Mateusz Byczkowski · Accepted Answer · 2018-11-20 16:55:30Z

I recommend you to parse JSON file to String from this topic: How to read json file into java with simple JSON library

Then you can take your JSON-String and parse to Map (or whatever you specify) by popular and simple library Gson.

String myJSON = parseFileToString(); //get your parsed json as string Type mapType = new TypeToken<Map<String, String>>(){}.getType(); //specify type of your JSON format Map<String, String> = new Gson().fromJson(myJSON, mapType); //convert it to map

Then you can pass this map as a request body to your post. Dont pass any JSON data as URL in POST methods. Data in URL isn't good idea as long as you are not using GET (for example).

You can also send whole JSON (in String version) as parameter, without converting it to Maps or objects. This is only example :)

And if you want to pass this map in your POST method you can follow this topic: Send data in Request body using HttpURLConnection

[UPDATE] it worked fine, result 200 OK from server, no exceptions, no errors:

 package com.company; import java.io.DataInputStream; import java.io.File; //import org.json.JSONObject; import java.io.FileReader; import java.io.IOException; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.URL; import javax.net.ssl.HttpsURLConnection; import org.json.simple.JSONObject; import org.json.simple.parser.JSONParser; import org.json.simple.parser.ParseException; public class TestAuth { public static void main(String[] args) { // TODO Auto-generated method stub File file = new File("test.json"); try { JSONParser parser = new JSONParser(); //Use JSONObject for simple JSON and JSONArray for array of JSON. JSONObject data = (JSONObject) parser.parse( new FileReader(file.getAbsolutePath()));//path to the JSON file. System.out.println(data.toJSONString()); String paramValue = "param\\with\\backslash"; String yourURLStr = "http://host.com?param=" + java.net.URLEncoder.encode(paramValue, "UTF-8"); URL url2 = new URL("https://0c193bc3-8439-46a2-a64b-4ce39f60b382.mock.pstmn.io"); HttpsURLConnection conn = (HttpsURLConnection) url2.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("Accept", "application/json"); conn.setRequestProperty("Authorization", "Bearer aanjd-usnss092-mnshss-928nss"); conn.setDoOutput(true); OutputStream outStream = conn.getOutputStream(); OutputStreamWriter outStreamWriter = new OutputStreamWriter(outStream, "UTF-8"); outStreamWriter.write(data.toJSONString()); outStreamWriter.flush(); outStreamWriter.close(); outStream.close(); String response = null; System.out.println(conn.getResponseCode()); System.out.println(conn.getResponseMessage()); DataInputStream input = null; input = new DataInputStream (conn.getInputStream()); while (null != ((response = input.readLine()))) { System.out.println(response); input.close (); } } catch (IOException | ParseException e) { e.printStackTrace(); } } }

Let me know if that answer fixed your problem. Greetings!

I have updated the ques . Pls check what i tried . Getting error java.io.IOException: Server returned HTTP response code: 401 for
Answer is updated too. Everything should be fine now :) It works on my computer.

user2023577 · Accepted Answer · 2018-11-24 14:40:12Z

I admit I read the code fast but it seems ok. However, a 401 status means this server's url requires proper authentication. https://httpstatuses.com/401

You may need to send valid authentication to be authorized. Your authorization header must be invalid.

Raghavendra Prasad · Accepted Answer · 2018-11-24 12:53:48Z

You can read the file in a method and pass the json string data read from the file to another method for posting the json data to the Rest end point 1) Read the Json data from the file public String readJsonDataFromFile() { InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(new File("sample.json"))); StringWriter writer = new StringWriter(); IOUtils.copy(inputStreamReader, writer); return writer.toString()); } 2) Call the Restend point passing the Json data public void postData(String payload) { String url = "http://localhost:8080/endPoint"; // Use the access token for authentication HttpHeaders headers = new HttpHeaders(); headers.add("Authorization", "Bearer " + token); HttpEntity<String> entity = new HttpEntity<>(headers); ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST, entity, String.class); System.out.println(response.getBody()); } As the response returned is 401, it is not successfully authenticated with the rest endpoint, check the error log if it gives more info about the error like whether the access token is expired.

Stuti Verma · Accepted Answer · 2018-11-26 07:20:30Z

Try:

 String username = "username"; String password = "password"; String auth=new StringBuffer(username).append(":").append(password).toString(); byte[] encodedAuth = Base64.encodeBase64(auth.getBytes(Charset.forName("US-ASCII"))); String authHeader = "Basic " + new String(encodedAuth); post.setHeader("AUTHORIZATION", authHeader);

Also, have a look at the answers at this link: Http Basic Authentication in Java using HttpClient?

Sébastien Tromp · Accepted Answer · 2018-11-16 15:59:59Z

If you want to read the content of the JSON file, you can do something like this, assuming your JSON file is located in the same package as the class that tries to load it:

InputStream stream = YourClass.class.getResourceAsStream(fileName); String result = CharStreams.toString(new InputStreamReader(stream));

As for sending the actual request, I think you can have a look at How to send Https Post request in java for instance

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