CODEWITHSUNDEEP
javahttpcurlpost
Saisankar Gochhayat
Saisankar Gochhayat

Reputation: 165

Need help converting a curl request to java request

I have a certain curl request as given below - 

curl -POST -H 'access-key: <apikey>' -H "Content-type: application/json" -d '{
"item": "electricity",
"region": "india",
"unit": "kWh",
"quantity": 1.564}' 'https://www.carbonhub.xyz/v1/emissions'`

I tried making a java counterpart for the same , this is what I have come up till now -

package org.kodejava.example.httpclient;    
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class getEmissions {
    public static void main(String[] args) {
        HttpClient client = HttpClientBuilder.create().build();
        HttpPost post = new HttpPost("https://www.carbonhub.xyz/v1/emissions");

        List<NameValuePair> data = new ArrayList<>(4); 
        data.add(new BasicNameValuePair("item", "electricity"));
        data.add(new BasicNameValuePair("region", "india"));
        data.add(new BasicNameValuePair("unit", "kWh"));
        data.add(new BasicNameValuePair("quantity", 1.564));

        try {
            post.setEntity(new UrlEncodedFormEntity(data));
            post.setHeader("Content-Type","application/json");
            // use your api key
            post.setHeader("access-key","<apikey>");
            HttpResponse response = client.execute(post);

            // Print out the response message
            System.out.println(EntityUtils.toString(response.getEntity()));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Please let me know how to fix this. Thank you in advance.

Upvotes: 1

Views: 290

Answers (1)

Vikas Sachdeva
Vikas Sachdeva

Reputation: 5803

The way you are sending data in POST request is not as per specified curl command.

You should first make a JSON string for your input. There are various libraries you can use for this purpose like Jackson, JSON-java, Gson etc. or you can manually construct JSON string (not recommended) and then you should send JSON string as data in POST request.

Below is one way to manually constructing JSON string and then sending it as POST data -

package org.kodejava.example.httpclient;    

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

public class getEmissions {
    public static void main(String[] args) {
        HttpClient client = HttpClientBuilder.create().build();
        HttpPost post = new HttpPost("https://www.carbonhub.xyz/v1/emissions");

        StringBuilder requestData = new StringBuilder("'{");
        requestData.append("\"item\"").append(':').append("\"electricity\"").append(',');
        requestData.append("\"region\"").append(':').append("\"india\"").append(',');
        requestData.append("\"unit\"").append(':').append("\"kWh\"").append(',');
        requestData.append("\"quantity\"").append(':').append("1.564");
        requestData.append("}'");

        StringEntity requestDataEntity = new StringEntity(requestData.toString(),ContentType.APPLICATION_JSON);
        try {
            post.setEntity(requestData);
            // use your api key
            post.setHeader("access-key","<apikey>");
            HttpResponse response = client.execute(post);

            // Print out the response message
            System.out.println(EntityUtils.toString(response.getEntity()));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Upvotes: 1

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