JavaFetcher.java

JavaFetcher.java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
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;

//https://code.google.com/archive/p/json-simple
public class Fetcher {
	
	private static JSONParser jsonParser = new JSONParser();
	
	public static void main(String[] args) {
		String payload="{\"jsonrpc\":\"2.0\",\"method\":\"changeDetail\",\"params\":[{\"id\":11376}],\"id\":2}";
		String requestUrl="https://httpbin.org";
		
		String response = sendPostRequest(requestUrl+"/get","GET","");
		String response2 = sendPostRequest(requestUrl+"/post","POST",payload);
		
		parse(response);
		parse(response2);
		
	}
	public static String sendPostRequest(String requestUrl, String method, String payload) {
		StringBuffer jsonString = new StringBuffer();
		
	    try {
	        URL url = new URL(requestUrl);
	        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();

	        connection.setDoInput(true);
	        connection.setDoOutput(true);
	        connection.setRequestMethod(method);
	        connection.setRequestProperty("Accept", "application/json");
	        connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
	        
	        if(!"".equals(payload)) {
	        	OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream(), "UTF-8");
	        	writer.write(payload);
	        	writer.close();
	        }
	        
	        BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
	        
	        String line;
	        while ((line = br.readLine()) != null) {
	                jsonString.append(line);
	        }
	        br.close();
	        connection.disconnect();
	    } catch (Exception e) {
	            throw new RuntimeException(e.getMessage());
	    }
	    
	    return jsonString.toString();
	}
	
	private static void parse(String json) {
		JSONObject obj = null;
		try {
			obj = (JSONObject) jsonParser.parse(json);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		System.out.println(obj);
	}
}