POST Method example using HttpsURLConnection

httpurlconnection_post_example.java

package com.company;


import javax.net.ssl.HttpsURLConnection;
import java.io.*;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;


public class Main {

    public static void main(String[] args) throws Exception {

        try {
            String url = "https://example.com/api/v2";
            HttpsURLConnection conn = (HttpsURLConnection) new URL(url).openConnection();

            //Add request header
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Authorization", "Bearer " + "eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyIjoiOTkxMzE5MDAyOTEiLCJkYXRhIjoiMjAxOC0wNy0yNCAxMDowOTowNSAtMDQwMCIsInJhbmRvbSI6NTg2fQ.V70gpiGkcBQqctAbSU3aqvAPVSkAC6ScX5ZIinIXb_w");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

            //Parameters
            Map<String, String> parameters = new HashMap<String, String>();
            parameters.put("usuario", "usuario");
            String urlParameters = processRequestParameters(parameters);

            //Send Post
            conn.setDoOutput(true);
            DataOutputStream wr = new DataOutputStream((conn.getOutputStream()));
            wr.writeBytes(urlParameters);
            wr.flush();
            wr.close();

            int responseCode = conn.getResponseCode();
            System.out.println("Sending 'POST' request to URL : " + url);
            System.out.println("Post parameters : " + urlParameters);
            System.out.println("Response Code : " + responseCode);

            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

            System.out.println(response.toString());

        } catch (Exception e) {
            System.out.println(e);
        }
    }

    private static String processRequestParameters(Map<String, String> parameters) throws UnsupportedEncodingException {
        StringBuilder sb = new StringBuilder();
        for (String parameterName : parameters.keySet()) {
            sb.append(parameterName).append('=').append(URLEncoder.encode(parameters.get(parameterName), "UTF-8")).append('&');
        }
        return sb.substring(0, sb.length() - 1);
    }
}