Servlet / Gaurang Jadia

I came across a question on StackOverflow.com yesterday. As, I have used Twilio API to send SMS and do Phone Call many times. I signed up to help the OP.

If you wanna compile following code in your local box, then you need to have JSON.jar and commons-codec-1.8.jar JAR files. Download File Archive

package com.gaurangjadia.code.controllers;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;
import org.json.*;

import com.gaurangjadia.code.base.WebFramework;
import com.gaurangjadia.code.base.WebFramework.HttpMethod;

@WebServlet("/Twilio")
public class Twilio extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
    public Twilio() {
        super();
    }
    
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.getRequestDispatcher("/WEB-INF/twilio.jsp?strResponse=").forward(request, response);
	}
	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String strToNumber = request.getParameter("toNumber");
		String strBody = request.getParameter("body");
		
		WebFramework objWebFramework = new WebFramework();
		
		Map<String, String> mapParameters = new HashMap<String, String>();
		mapParameters.put("From", "+16264869550");
		mapParameters.put("To", strToNumber);
		mapParameters.put("Body", strBody);
		
		String authString = "AC2ce688407e7089dfd0f93eec57db9620:2b84176caf367d6ab02959c175d89599";
		byte[] authEncBytes = Base64.encodeBase64(authString.getBytes());
		String authStringEnc = new String(authEncBytes);
		
		Map<String, String> mapHeaders = new HashMap<String, String>();
		mapHeaders.put("Authorization", "Basic " + authStringEnc);
		
		String strResponse = objWebFramework.doHttpRequest("https://api.twilio.com/2010-04-01/Accounts/AC2ce688407e7089dfd0f93eec57db9620/SMS/Messages.json", HttpMethod.POST, mapParameters, mapHeaders);
		
		//To Pretty Print JSON Response
		JSONObject objJSON = new JSONObject(strResponse);
		
		request.getRequestDispatcher("/WEB-INF/twilio.jsp?strResponse=" + objJSON.toString(3)).forward(request, response);
	}
}

package com.gaurangjadia.code.controllers;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;

import org.json.*;

import com.gaurangjadia.code.base.WebFramework;

import com.gaurangjadia.code.base.WebFramework.HttpMethod;

@WebServlet("/Twilio")

public class Twilio extends HttpServlet {

private static final long serialVersionUID = 1L;

public Twilio() {

super();

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.getRequestDispatcher("/WEB-INF/twilio.jsp?strResponse=").forward(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String strToNumber = request.getParameter("toNumber");

String strBody = request.getParameter("body");

WebFramework objWebFramework = new WebFramework();

Map<String, String> mapParameters = new HashMap<String, String>();

mapParameters.put("From", "+16264869550");

mapParameters.put("To", strToNumber);

mapParameters.put("Body", strBody);

String authString = "AC2ce688407e7089dfd0f93eec57db9620:2b84176caf367d6ab02959c175d89599";

byte[] authEncBytes = Base64.encodeBase64(authString.getBytes());

String authStringEnc = new String(authEncBytes);

Map<String, String> mapHeaders = new HashMap<String, String>();

mapHeaders.put("Authorization", "Basic " + authStringEnc);

String strResponse = objWebFramework.doHttpRequest("https://api.twilio.com/2010-04-01/Accounts/AC2ce688407e7089dfd0f93eec57db9620/SMS/Messages.json", HttpMethod.POST, mapParameters, mapHeaders);

//To Pretty Print JSON Response

JSONObject objJSON = new JSONObject(strResponse);

request.getRequestDispatcher("/WEB-INF/twilio.jsp?strResponse=" + objJSON.toString(3)).forward(request, response);

}

I wrote this class to generalize any Web Related Helper Methods.

package com.gaurangjadia.code.base;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Map;

public class WebFramework {
	
	public enum HttpMethod {
	    GET,
		POST,
		HEAD,
		DELETE,
		PUT
	}
	
	/**
	 * Return String Response after calling given URL 
	 *
	 * @param	strURL			URL to make request
	 * @param	httpMethod		HTTP Method to Call (GET, POST, HEAD, DELETE, PUT)
	 * @param	mapParameters	Collection of Arguments to pass in the HTTP WebRequest
	 * @param	mapHeaders		Collection of Arguments to pass in the HTTP Headers
	 * @return					String Response came from remote server
	 * @throws IOException 
	 */
	public String doHttpRequest(String strURL, HttpMethod httpMethod, Map<String, String> mapParameters, Map<String, String> mapHeaders) throws IOException{
		String strResponse = "";
		
		if (httpMethod == WebFramework.HttpMethod.GET) {
			URL objURL = new URL(strURL + "?" + this.encodeMap(mapParameters));
			
			HttpURLConnection objConnection = (HttpURLConnection) objURL.openConnection();
			objConnection.setRequestMethod("GET");
			
			BufferedReader in = new BufferedReader(new InputStreamReader(objConnection.getInputStream()));
			String inputLine;
			StringBuffer response = new StringBuffer();
	 
			while ((inputLine = in.readLine()) != null) {
				response.append(inputLine);
			}
			in.close();
			strResponse = response.toString();
		}
		else if (httpMethod == WebFramework.HttpMethod.POST) {
			URL objURL = new URL(strURL);
			
			HttpURLConnection objConnection = (HttpURLConnection) objURL.openConnection();
			objConnection.setRequestMethod("POST");
			
			for (Map.Entry<String, String> entry : mapHeaders.entrySet()) {
				objConnection.setRequestProperty(entry.getKey().toString(), entry.getValue().toString());
			}
			objConnection.setDoOutput(true);
			
			DataOutputStream wr = new DataOutputStream(objConnection.getOutputStream());
			wr.writeBytes(this.encodeMap(mapParameters));
			wr.flush();
			wr.close();
			
			BufferedReader in = new BufferedReader(new InputStreamReader(objConnection.getInputStream()));
			String inputLine;
			StringBuffer response = new StringBuffer();
	 
			while ((inputLine = in.readLine()) != null) {
				response.append(inputLine);
			}
			in.close();
			strResponse = response.toString();
		}
		else {
			throw new UnsupportedOperationException("HEAD, DELETE and PUT methods yet not supported");
		}
		
		return strResponse;
	}
	
	public String encodeMap(Map<String, String> map) throws UnsupportedEncodingException {
        StringBuilder sb = new StringBuilder();
        
        for (Map.Entry<String, String> entry : map.entrySet()) {
            
        	if (sb.length() > 0) {
                sb.append("&");
            }
            
            sb.append(String.format("%s=%s", urlEncodeUTF8(entry.getKey().toString()), urlEncodeUTF8(entry.getValue().toString()) ));
            
        }
        
        return sb.toString();       
    }
	
	static String urlEncodeUTF8(String s) throws UnsupportedEncodingException {
		return URLEncoder.encode(s, "UTF-8");
    }
}

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package com.gaurangjadia.code.base;

import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

import java.util.Map;

public class WebFramework {

public enum HttpMethod {

GET,

POST,

HEAD,

DELETE,

PUT

}

/**

* Return String Response after calling given URL

* @param strURL URL to make request

* @param httpMethod HTTP Method to Call (GET, POST, HEAD, DELETE, PUT)

* @param mapParameters Collection of Arguments to pass in the HTTP WebRequest

* @param mapHeaders Collection of Arguments to pass in the HTTP Headers

* @return String Response came from remote server

* @throws IOException

public String doHttpRequest(String strURL, HttpMethod httpMethod, Map<String, String> mapParameters, Map<String, String> mapHeaders) throws IOException{

String strResponse = "";

if (httpMethod == WebFramework.HttpMethod.GET) {

URL objURL = new URL(strURL + "?" + this.encodeMap(mapParameters));

HttpURLConnection objConnection = (HttpURLConnection) objURL.openConnection();

objConnection.setRequestMethod("GET");

BufferedReader in = new BufferedReader(new InputStreamReader(objConnection.getInputStream()));

String inputLine;

StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {

response.append(inputLine);

}

in.close();

strResponse = response.toString();

}

else if (httpMethod == WebFramework.HttpMethod.POST) {

URL objURL = new URL(strURL);

HttpURLConnection objConnection = (HttpURLConnection) objURL.openConnection();

objConnection.setRequestMethod("POST");

for (Map.Entry<String, String> entry : mapHeaders.entrySet()) {

objConnection.setRequestProperty(entry.getKey().toString(), entry.getValue().toString());

}

objConnection.setDoOutput(true);

DataOutputStream wr = new DataOutputStream(objConnection.getOutputStream());

wr.writeBytes(this.encodeMap(mapParameters));

wr.flush();

wr.close();

BufferedReader in = new BufferedReader(new InputStreamReader(objConnection.getInputStream()));

String inputLine;

StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {

response.append(inputLine);

}

in.close();

strResponse = response.toString();

}

else {

throw new UnsupportedOperationException("HEAD, DELETE and PUT methods yet not supported");

}

return strResponse;

}

public String encodeMap(Map<String, String> map) throws UnsupportedEncodingException {

StringBuilder sb = new StringBuilder();

for (Map.Entry<String, String> entry : map.entrySet()) {

if (sb.length() > 0) {

sb.append("&");

}

sb.append(String.format("%s=%s", urlEncodeUTF8(entry.getKey().toString()), urlEncodeUTF8(entry.getValue().toString()) ));

}

return sb.toString();

}

static String urlEncodeUTF8(String s) throws UnsupportedEncodingException {

return URLEncoder.encode(s, "UTF-8");

}

To output property, I used Bootstrap 2.3.2 in following JSP.

<%@ page language="java" contentType="text/html; charset=US-ASCII" pageEncoding="US-ASCII"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<title>Twilio Messages (Send message Example)</title>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="http://getbootstrap.com/2.3.2/assets/css/bootstrap.css" rel="stylesheet">
<link href="http://getbootstrap.com/2.3.2/assets/css/bootstrap-responsive.css" rel="stylesheet">
</head>
<body>
	<div class="container">
		<div class="row">
			<div class="span12">
				<h2>Twilio Messages (Send message Example)</h2>
				<form class="form-signin" action="Twilio" method="post">
					<div class="row">
						<div class="span3">
							Enter Number to send:
						</div>
						<div class="span3">
							<input type="text" name="toNumber" maxlength="10" placeholder="Enter 10 digits number to send" value="+16822037149"/>
						</div>
						<div class="span6">
							<div class="alert">
								<button type="button" class="close" data-dismiss="alert">&times;</button>
								The number to send an SMS to. This field accepts formatted and unformatted US numbers, e.g. +14155551212, (415) 555-1212 or 415-555-1212.<hr />
								To send message from SandBox Account. The Number has to be <a href="https://www.twilio.com/user/account/phone-numbers/verified" target="_blank">verified</a>
							</div>
						</div>
					</div>
		        	<div class="row">
						<div class="span3">
							Enter Message to send:
						</div>
						<div class="span3">
							<textarea name="body" maxlength="160" placeholder="Enter message to send">
							</textarea>
						</div>
						<div class="span6">
							<div class="alert">
								<button type="button" class="close" data-dismiss="alert">&times;</button>
								The text of the message you want to send, limited to 160 characters.
							</div>
						</div>
					</div>
					<div class="row">
						<div class="span3">
						</div>
						<div class="span9">
							<button class="btn" type="submit">Send</button>
						</div>
					</div>
		      	</form>
	      	</div>
      	</div>
      	<c:if test="${param.strResponse != ''}">
      	<div class="row">
      		<div class="span12">
      		<div class="alert alert-success">
      			Well Done! Message is send!!!
			</div>
      			<textarea style="width: 100%; height: 350px; font-family: monospace; font-weight: 900;" readonly="readonly">
      				<c:out value="${param.strResponse}"></c:out>
   				</textarea>
      		</div>
      	</div>
      	</c:if>
	</div>
</body>
<script type="text/javascript" src="https://code.jquery.com/jquery.min.js"></script>
<script type="text/javascript" src="http://getbootstrap.com/2.3.2/assets/js/bootstrap.js"></script>
</html>

<%@ page language="java" contentType="text/html; charset=US-ASCII" pageEncoding="US-ASCII"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<!DOCTYPE html>

<html>

<head>

<title>Twilio Messages (Send message Example)</title>

</head>

<body>

<h2>Twilio Messages (Send message Example)</h2>

Enter Number to send:

</div>

</div>

The number to send an SMS to. This field accepts formatted and unformatted US numbers, e.g. +14155551212, (415) 555-1212 or 415-555-1212.<hr />

To send message from SandBox Account. The Number has to be <a href="https://www.twilio.com/user/account/phone-numbers/verified" target="_blank">verified</a>

</div>

Enter Message to send:

</div>

</textarea>

</div>

The text of the message you want to send, limited to 160 characters.

</div>

</div>

</div>

</form>

</div>

<c:if test="${param.strResponse != ''}">

Well Done! Message is send!!!

</div>

<c:out value="${param.strResponse}"></c:out>

</textarea>

</div>

</c:if>

</div>

</body>

</html>

If you get all things working, the output would look like this.

Gaurang Jadia

Nothing is permanent except change

Tag Archives: Servlet

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