seadatanet-connector/src/org/gcube/dataanalysis/seadatanet/DivaHTTPClient.java

package org.gcube.dataanalysis.seadatanet;

import java.io.File;
import java.io.IOException;
import java.util.Scanner;
import java.util.logging.Logger;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.*;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;


import java.io.*;
  
public class DivaHTTPClient {

	public static String WEB_HTTP="http://gher-diva.phys.ulg.ac.be/web-vis/Python/web";
		
		
	public static DivaFilePostResponse uploadFile(File file) throws ClientProtocolException, IOException, ParserConfigurationException, SAXException
	{
		
		//connection
		CloseableHttpClient httpclient = HttpClients.createDefault();
		HttpPost httppost = new HttpPost(WEB_HTTP+"/upload");

		//Creation of MultipartEntity
		FileBody bin = new FileBody(file);
		HttpEntity reqEntity = MultipartEntityBuilder.create().addPart("data", bin).build();
		httppost.setEntity(reqEntity);

		//response Server
		CloseableHttpResponse response = httpclient.execute(httppost);
		Logger.getGlobal().info(response.getStatusLine()+"");
		
		HttpEntity resEntity = response.getEntity();
		if (resEntity == null) {
			throw new SAXException("Error in HTTP response no response element found!");
		}
		
		//saving Response into String
		String result_xml="";
		Scanner scanner=new Scanner(resEntity.getContent());
		while(scanner.hasNext())
		{
			result_xml
			+=scanner.nextLine();
		}
		
		//Create Document object by XMLResponse
		Document doc = loadXMLFromString(result_xml);
		//Print XML Response
		System.out.println( result_xml);

		Node root = doc.getDocumentElement();
		if(root== null) throw new SAXException("Error in HTTP response no root element found!");

		Integer obs_count=Integer.parseInt(root.getChildNodes().item(1).getTextContent());

		Double obs_x0=Double.parseDouble(root.getChildNodes().item(3).getTextContent());
		Double obs_x1=Double.parseDouble(root.getChildNodes().item(5).getTextContent());
		Double obs_y0=Double.parseDouble(root.getChildNodes().item(7).getTextContent());
		Double obs_y1=Double.parseDouble(root.getChildNodes().item(9).getTextContent());
		Double obs_v0=Double.parseDouble(root.getChildNodes().item(11).getTextContent());
		Double obs_v1=Double.parseDouble(root.getChildNodes().item(13).getTextContent());

		String sessionid=root.getChildNodes().item(15).getTextContent();

		EntityUtils.consume(resEntity);
		response.close();

		httpclient.close();

		return new DivaFilePostResponse(obs_x0, obs_x1, obs_y0, obs_y1, obs_v0, obs_v1, obs_count, sessionid);

	}
	


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

		DivaFilePostResponse response=uploadFile(new File("C:"+File.separator+"Users"+File.separator+"marbas"+File.separator+"Desktop"+File.separator+"temperature_argo.txt"));
		
		System.out.println(response);
	}
	
	
	//PARSER XML
	private static Document loadXMLFromString(String xml) throws ParserConfigurationException, SAXException, IOException
	{
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		DocumentBuilder builder = factory.newDocumentBuilder();
		InputSource is = new InputSource(new StringReader(xml));
		return builder.parse(is);
	}

}