Send ajax calls from java ( http protocol data to Node or server). It convert the Map object into JSON object and vice versa. It requires gson.jar and java-json.jar.

Http_to_node.java

package com.controller;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class Http_to_node {

	static String node_server = "http://localhost:8124";

	public static Map<String,String> sendrequest(String strPostData, String operation) {

		URL url;
		Map<String,String> m = new HashMap<String,String>();
		try {
			// String strPostData = "password=123";
			url = new URL(node_server + "/"+operation);
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			conn.setRequestMethod("POST");

			conn.setRequestProperty("Content-Type", "application/json");
			conn.setRequestMethod("POST");
			conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
			conn.setRequestProperty("Content-length",Integer.toString(strPostData.length()));
			conn.setRequestProperty("Content-Language", "en-GB");
			conn.setRequestProperty("charset", "utf-8");
			conn.setUseCaches(false);
			conn.setDoOutput(true);

			DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
			dos.writeBytes(strPostData);
			dos.flush();
			dos.close();

			int intResponse = conn.getResponseCode();
			System.out.println("\nSending 'POST' to " + url.toString()
					+ ", data: " + strPostData + ", rc: " + intResponse);
			;

			BufferedReader in = new BufferedReader(new InputStreamReader(
					conn.getInputStream()));
			String inputLine;
			StringBuffer content = new StringBuffer();
			while ((inputLine = in.readLine()) != null) {
				content.append(inputLine);
			}

			in.close();
			System.out.println("\nResponses from " + url.toString());
			System.out.println(content);

			String strcontent = new String(content); 
			m= Http_to_node.stringintojson(strcontent);
			
			conn.disconnect();

		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
		} catch (IOException e) {
			// TODO Auto-generated catch block
		}

		return m ;
	}
	

	public static Map<String,String> getDetail(String strGetData, String operation) {

		URL url;
		Map<String,String> m = new HashMap<String,String>();
		try {
			// String strPostData = "password=123";
			url = new URL(node_server + "/"+operation);
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			conn.setRequestMethod("GET");

			conn.setRequestProperty("Content-Type", "application/json");
			conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
			conn.setRequestProperty("Content-length",Integer.toString(strGetData.length()));
			conn.setRequestProperty("Content-Language", "en-GB");
			conn.setRequestProperty("charset", "utf-8");
			conn.setUseCaches(false);
			conn.setDoOutput(false);


			int intResponse = conn.getResponseCode();
			System.out.println("\nSending 'GET' to " + url.toString()
					+ ", data: " + strGetData + ", rc: " + intResponse);
			;

			BufferedReader in = new BufferedReader(new InputStreamReader(
					conn.getInputStream()));
			String inputLine;
			StringBuffer content = new StringBuffer();
			while ((inputLine = in.readLine()) != null) {
				content.append(inputLine);
			}

			in.close();
			System.out.println("\nResponses from " + url.toString());
			System.out.println(content);
			
			String strcontent = new String(content); 
			m= Http_to_node.stringintojson(strcontent);

			conn.disconnect();

		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			
		}

		return m ;
	}
	
	
	public static Map<String,String> stringintojson(String content){
		Map<String,String> m = new HashMap<String,String>();
		try{

		JsonParser jsonParser = new JsonParser();
		JsonElement element = jsonParser.parse(content.toString());

		JsonObject result = element.getAsJsonObject();
		Set<Map.Entry<String, JsonElement>> entrySet = result.entrySet();
		
		for(Map.Entry<String, JsonElement> entry : entrySet) {
			
		  m.put(entry.getKey(),entry.getValue().toString().replace("\"", ""));
		    //code...
		}
		}catch(IllegalStateException e){
			
		}
		return m;
	}
	
	public static void main(String[] args){
			

		String str="";
		
		Map<String,String>map = Http_to_node.getDetail(str,"txhash/"+"0x3aae48b3e1ea16b29a04c548d73711d70f36e0ea56e597652b1714f32adee2e2");
		System.out.println(map);
		
		
		
		
	}

}