Java OkHttps Library(Android/JAVA EE WEB)Using API Request Handle

1: Firstly you can Create Java Project

2:You can add Dependancies(search to find latest version) #https://square.github.io/okhttp/

3:Look This Code and create new java.file and Copy page

You can change HttpUrl variable valus and media type

RETURN JSON DATA SET AS A STRING

RETURN JSON DATA SET AS A STRING

Gson using Deserialize the Responce dataset and Its put to class array object

Your class variable names Match as a your Response Json Object data set values

LIKE THIS

content type should be json

• GSon Librray using we can Deserialization Json object to class array object

https://www.tutorialspoint.com/gson/gson_quick_guide.htm

• Additionaly You can use simple-json Library to read json responce data.

https://www.tutorialspoint.com/json_simple/json_simple_quick_guide.htm

package ConnectRestServer;

import java.io.IOException;

import com.google.gson.Gson;

import com.google.gson.GsonBuilder;

import modelsPkg.CentersModel;

import okhttp3.Call;

import okhttp3.Callback;

import okhttp3.MediaType;

import okhttp3.OkHttpClient;

import okhttp3.Request;

import okhttp3.RequestBody;

import okhttp3.Response;

public class ConnectinServer {

public static final MediaType MEDIA_TYPE_MARKDOWN = MediaType.parse(“text/x-markdown; charset=utf-8”);

private final OkHttpClient client = new OkHttpClient();

private String httpUrl = “http://localhost:8080/HospitalRestServer/webapi/database";

public void GETDataFrommmmm(String endPointName) {

Request request = new Request.Builder().url(httpUrl + endPointName).build();

Call call = client.newCall(request);

call.enqueue(new Callback() {

public void onResponse(Call call, Response response) throws IOException {

System.out.print(response.body().string());

}

public void onFailure(Call call, IOException e) {

System.out.print(e.toString());

}

});

}

public String GETDataFrom(String endPointName) throws IOException {

Request request = new Request.Builder().url(httpUrl + endPointName).build();

try (Response response = client.newCall(request).execute()) {

return response.body().string();

}

}

public String POSTDataFrom(String endPointName, String postBody) throws Exception {

@SuppressWarnings(“deprecation”)

Request request = new Request.Builder().url(httpUrl + endPointName)

.post(RequestBody.create(MEDIA_TYPE_MARKDOWN, postBody)).build();

try (Response response = client.newCall(request).execute()) {

if (!response.isSuccessful()) {

throw new IOException(“Unexpected code “ + response);

} else {

return response.body().string();

}

}

}

/*

* whenAsynchronousGetRequest_thenCorrect see web site

* https://square.github.io/okhttp/recipes/#posting-a-string-kt-java

*

* FIX CORS ERROS LOOK THIS

*

* Request request = new Request.Builder()

* .url(“https://api.github.com/repos/square/okhttp/issues")

* .header(“User-Agent”, “OkHttp Headers.java”) .addHeader(“Accept”,

* “application/json; q=0.5”) .addHeader(“Accept”,

* “application/vnd.github.v3+json”) .build();

*

* 1- api response content type ckeck in postman

* 2- create model class to json

* response key names using

* 3- gson using deserialize data set to model class

* array object

*

*

*/

}

Create new java class

package modelsPkg;

public class CentersModel {

private String id, name, location = null;

public String getId() {

return id;

}

public void setId(String id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getLocation() {

return location;

}

public void setLocation(String location) {

this.location = location;

}

}